Literature DB >> 26594417

Crystal structure of 4'-{[4-(2,2':6',2''-terpyrid-yl-4'-yl)phen-yl]ethyn-yl}biphenyl-4-yl (2,2,5,5-tetra-methyl-1-oxyl-3-pyrrolin-3-yl)formate benzene 2.5-solvate.

Andreas Meyer1, Gregor Schnakenburg2, Olav Schiemann1.   

Abstract

The title compound, C44H35N4O3·2.5C6H6 (1), consists of a terpyridine and a n class="Chemical">N-oxylpyrroline-3-formate group separated by an aromatic spacer, viz. 4-(phenyl-ethyn-yl)-1,1'-biphenyl. It crystallized in the triclinic space group P-1 with two and a half benzene solvate mol-ecules (one benzene mol-ecule is located about an inversion center), while the di-chloro-methane solvate (2) of the same mol-ecule [Ackermann et al. (2015 ▸). Chem. Commun. 51, 5257-5260] crystallized in the tetra-gonal space group P42/n, with considerable disorder in the mol-ecule. In (1), the terpyridine (terpy) group assumes an all-trans conformation typical for terpyridines. It is essentially planar with the two outer pyridine rings (B and C) inclined to the central pyridine ring (A) by 8.70 (15) and 14.55 (14)°, respectively. The planes of the aromatic spacer (D, E and F) are nearly coplanar with dihedral angles D/E, D/F and E/F being 3.42 (15), 5.80 (15) and 4.00 (16)°, respectively. It is twisted with respect to the terpy group with, for example, dihedral angle A/D being 24.48 (14)°. The mean plane of the N-oxylpyrroline is almost normal to the biphenyl ring F, making a dihedral angle of 86.57 (16)°, and it is inclined to pyridine ring A by 72.61 (15)°. The intra-molecular separation between the O atom of the nitroxyl group and the N atom of the central pyridine ring of the terpyridine group is 25.044 (3) Å. In the crystal, mol-ecules are linked by pairs of C-H⋯O hydrogen bonds, forming inversion dimers. The dimers stack along the c axis forming columns. Within and between the columns, the spaces are occupied by benzene mol-ecules. The shortest oxygen-oxygen separation between nitroxyl groups is 4.004 (4) Å. The details of the title compound are compared with those of the di-chloro-methane solvate (2) and with the structure of a related mol-ecule, 4'-{4-[(2,2,5,5-tetra-methyl-N-oxyl-3-pyrrolin-3-yl)ethyn-yl]phen-yl}-2,2':6',2''-terpyridine (3), which has an ethynylphenyl spacer [Meyer et al. (2015). Acta Cryst. E71, 870-874].

Entities:  

Keywords:  C—H⋯π inter­actions; crystal structure; ethynylphen­yl; hydrogen bonds; nitroxide; nitrox­yl; phenyl­ethynylbiphen­yl; terpyridine; π–π inter­actions

Year:  2015        PMID: 26594417      PMCID: PMC4647389          DOI: 10.1107/S2056989015017697

Source DB:  PubMed          Journal:  Acta Crystallogr E Crystallogr Commun


Chemical context

The title compound (1) was synthesized as a ligand for 3d metal ions in the framework of a pulsed EPR study on n class="Chemical">metal–nitroxyl model systems. It contains a nitroxyl group and a terpyridine (terpy) group which is capable of taking up metal ions. The title compound resembles compound (3) (4′-{4-[(2,2,5,5-tetra­methyl-N-oxyl-3-pyrrolin-3-yl)ethyn­yl]phen­yl}-2,2′:6′,2′′-terpyridine), which has an ethynylphenyl spacer (Meyer et al., 2015a ▸), compared to the phenyl­ethynylbiphenyl spacer in the title compound (1). Nitroxyls are of inter­est in various branches of chemistry including magnetochemistry (Rajca et al., 2006 ▸; Fritscher et al., 2002 ▸), synthetic chemistry (Hoover & Stahl, 2011 ▸; Fey et al., 2001 ▸) and structural biology (Reginsson & Schiemann, 2011 ▸). Terpyridines show pH-dependent luminescence properties which have been analyzed in terms of a pH-dependent cis–trans isomerization (Nakamoto, 1960 ▸; Fink & Ohnesorge, 1970 ▸). Structural investigations in the solid state reveal an exclusive preference for the trans conformation (Fallahpour et al., 1999 ▸; Eryazici et al., 2006 ▸; Bessel et al., 1992 ▸; Grave et al., 2003 ▸). Terpyridines have been shown to be versatile ligands for various metal ions (Hogg & Wilkins, 1962 ▸; Constable et al., 1999 ▸; Narr et al., 2002 ▸; Meyer et al., 2015b ▸; Folgado et al., 1990 ▸).

Structural commentary

The mol­ecular structure of the title compound, (1), is shown in Fig. 1 ▸. The crystal structure of the di­chloro­methane solvate (2) of the title compound has been reported (Ackermann et al., 2015 ▸). However, these authors used a different protocol for the crystallization of (1) and the conformation of (2) differs markedly from the one presented herein, as shown in the structural overlay of the two compounds (Fig. 2 ▸). The structural overlay of compounds (1) and (3) also illustrate the differences in their conformations (Fig. 3 ▸).
Figure 1

The mol­ecular structure of the title compound (1), with atom labelling. Displacement ellipsoids are drawn at 50% probability level. The benzene mol­ecules and the H atoms have been omitted for clarity.

Figure 2

The structural overlay of compounds (1) and (2) [title compound (1) blue, compound (2 – the di­chloro­methane solvate (Ackermann et al., 2015 ▸) – red].

Figure 3

The structural overlay of compounds (1) and (3) [title compound (1) blue, compound (3) – (Meyer et al., 2015a ▸) – green].

In (1) the terpy group assumes the usual all–trans conformation (Meyer et al., 2015a ▸; Fallahpour et al., 1999 ▸; Eryazici et al., 2006 ▸; Bessel et al., 1992 ▸; Grave et al., 2003 ▸). It is essentially planar with the two outer rings B (N3/C35–C39) and C (N4/C40–C44) being inclined to the central n class="Chemical">pyridine ring A (N2/C30–C34) by 8.70 (15) and 14.55 (14)°, respectively. The conformation of the nitroxyl group in (1) is similar to that found in (3), with a planar pyrroline (N1/C1–C4) ring assuming an angle of 72.61 (15)° to the central pyridine ring A [see also Margraf et al. (2009 ▸) and Schuetz et al. (2010 ▸)]. In (3) this dihedral angle is 88.44 (7)°, while in (2) the same dihedral angle is 21.6 (2)°. The N-oxylpyrroline-3-formate subunit is linked by a rigid spacer, consisting of a 4,4′-bi­phenyl­ene, an n class="Chemical">ethynylene and a p-phenyl­ene group, to the terpy subunit. The intra­molecular separation of the nitroxyl and the terpy group is 25.044 (3) Å (measured between O1 and N2). The three phenyl groups within the spacer are nearly coplanar, with dihedral angles between the rings of 4.00 (16)°, for rings D (C10–C15) and E (C16–C21), and 3.42 (15)° for rings E and F (C24–C29). Compared to the structure of (3), the spacer is closer to coplanarity to the central pyridine ring: dihedral angle A/D is 24.48 (14)°, compared to 51.36 (7)° in (3). The ethynylene group is slightly bent as in (3), with angle C19–C22–C23 = 174.6 (3) and C22–C23–C24 = 177.8 (3)°. There are short C—H⋯N contacts in the mol­ecule of 2.48 Å (H31⋯N3) and 2.49 Å (H34⋯N4). The same short contacts are also observed in (3). Such contacts have been classified as hydrogen bonds by Murguly et al. (1999 ▸).

Supra­molecular features

In the crystal of (1), Fig. 4 ▸, mol­ecules form layers which are nearly coplanar with the (01) plane. Neighbouring layers differ in the orientation of the mol­ecules and each layer is separated by layers of solvent mol­ecules. This arrangement possibly leads to favorable dispersive inter­actions although only one short C—H⋯π contact is observed between the solvent mol­ecules and mol­ecules of (1) (Table 1 ▸). Short π–π contacts are observed between the C rings of neighbouring mol­ecules and between the B and C rings (Fig. 5 ▸). The centroid-to-centroid distances are 3.678 (2) and 3.8915 (18) Å, respectively, and can be classified as slipped face-to-face π-inter­actions (Janiak, 2000 ▸).
Figure 4

Crystal packing of the title compound viewed along the a axis. Weak C—H⋯O hydrogen bonds are shown as dashed lines (see Table 1 ▸). H atoms not involved in C—H⋯O bonds have been omitted for clarity.

Table 1

Hydrogen-bond geometry (, )

Cg4, Cg7 and Cg10 are the centroids of pyridine ring N4/C40C44, spacer ring C24C29 and benzene ring C54C59, respectively.

DHA DHHA D A DHA
C37H37O1i 0.952.653.228(4)120
C38H38O2ii 0.952.553.485(4)169
C6H6CO1iii 0.982.613.499(4)151
C9H9B Cg4iv 0.962.793.602(4)140
C14H14Cg10v 0.952.883.608(4)134
C14H14Cg10vi 0.952.883.608(4)134
C55H55Cg7vii 0.952.903.680(3)140

Symmetry codes: (i) ; (ii) ; (iii) ; (iv) ; (v) ; (vi) ; (vii) .

Figure 5

π-stacking inter­actions between pyridine rings of neighboring mol­ecules. H atoms have been omitted for clarity.

Within the planes, there are weak C—H⋯O hydrogen bonds between the n class="Chemical">nitroxyl-O atom and the para-hydrogen atom of pyridine ring B (Table 1 ▸). Furthermore, two weak hydrogen bonds per mol­ecule are formed between pairs of layers (Table 1 ▸). One of these hydrogen bonds involves the nitroxyl O atom and a hydrogen atom of a methyl group of a mol­ecule from a neighboring layer. The other hydrogen bond is formed between the carbonylic O atom of the carboxyl­ate group and a meta-hydrogen atom of one of the outer pyridine rings of a mol­ecule from a neighboring layer. As the layers are hydrogen bonded pair-wise, the structure can also be described as consisting of double-layers. It is noteworthy that the arrangement of the mol­ecules of the title compound strongly depends upon the solvents of crystallization. In compound (1), the mol­ecules are arranged in layers and the benzene mol­ecules fill out the channels between the layers formed by the aromatic spacers of the mol­ecule. Close inter­molecule contacts exist only between the functional groups. In the structure of (2) (Ackermann et al., 2015 ▸), the solvent of crystallization is di­chloro­methane instead of n class="Chemical">benzene and mol­ecules are arranged having fourfold rotational site symmetry. The solvent mol­ecules fill out channels between the mol­ecules of (2), as in (1). However, the CH2Cl2 solvent mol­ecules in (2) are in close proximity to the terpyridine groups instead of to the aromatic spacer. Weak hydrogen bonds are formed predominantly involving the O atoms as acceptors and the pyrroline and the pyridine rings as donors, as observed in (2) and (3). The shortest oxygenoxygen separation between neighboring nitroxyl groups is 4.004 (4) Å. This O⋯O distance is an important factor determining the strength of through space exchange inter­actions of nitroxyls (Rajca et al. 2006 ▸).

Database survey

The Cambridge Structural Database (CSD, Version 5.36; Groom & Allen, 2014 ▸) has not been updated since our presentation of the structure of (2). The CSD query revealed, that non-coordinated terpyridines are arranged in an all-trans conformation, unless they are either protonated, li­thia­ted or cannot assume an all-trans conformation for reasons of steric hindrance.

Synthesis and crystallization

The synthesis of the title compound (1), is illustrated in Fig. 6 ▸. 480 mg (1.45 mmol) of 4′-(4-ethynylphen­yl)-2,2′:6′,2′′-terpyridine (Grosshenny & Ziessel, 1993 ▸), 780 mg (1.69 mmol) of 4′-iodo-p-biphen-4-yl-N-oxyl-2,2,5,5-n class="Species">tetra­methyl­pyrroline-3-formate (Bode et al., 2008 ▸) and 85 mg (0.12 mmol) of tetra­kis­(tri­phenyl­phosphane)palladium(0) were dissolved in a mixture of 20 ml of tri­ethyl­amine (TEA) and 9 ml of di­methyl­formamide (DMF) giving rise to an orange solution. The solution was heated to 323 K and stirred for 8 h after which the solvents were removed under reduced pressure. The resulting dark-orange powder was dissolved in di­chloro­methane (DCM) and subjected to column chromatography using aluminum oxide (5% water, height 30 cm, diameter 2.3 cm). First, a mixture of DCM and hexane in a 1:2 ratio was used as eluent until all remaining educt, reagents and side products were eluted (approximately 200–300 ml). The column was then eluted using pure DCM to obtain a yellow solution. Removing the solvent yielded the product as a pale-yellow solid (yield: 90%). Crystals suitable for X-ray crystallography were obtained by layering a solution of (1) in benzene with n-hexane.
Figure 6

The synthesis of the title compound (1).

Refinement

Crystal data, data collection and structure refinement details are summarized in Table 2 ▸. The H atoms were included in calculated positions and treated as riding atoms: C-H = 0.95-0.98 Å with Uiso(H) = 1.5Ueq(C) for methyl n class="Disease">H atoms and 1.2Ueq(C) for other H atoms. 16 reflections with bad agreement were omitted from the final refinement cycles.
Table 2

Experimental details

Crystal data
Chemical formulaC44H35N4O32.5C6H6
M r 863.03
Crystal system, space groupTriclinic, P
Temperature (K)123
a, b, c ()5.7578(1), 18.0559(4), 23.3716(6)
, , ()105.5870(13), 93.7408(13), 92.6002(14)
V (3)2330.41(9)
Z 2
Radiation typeMo K
(mm1)0.08
Crystal size (mm)0.28 0.20 0.08
 
Data collection
DiffractometerNonius KappaCCD
Absorption correctionMulti-scan (SORTAV; Blessing, 1995)
T min, T max 0.808, 1.000
No. of measured, independent and observed [I > 2(I)] reflections74528, 11227, 6356
R int 0.109
(sin /)max (1)0.661
 
Refinement
R[F 2 > 2(F 2)], wR(F 2), S 0.071, 0.217, 1.07
No. of reflections11227
No. of parameters587
No. of restraints1
H-atom treatmentH-atom parameters constrained
max, min (e 3)0.33, 0.27

Computer programs: HKL DENZO and SCALEPACK (Otwinowski Minor 1997 ▸), SHELXS97 (Sheldrick,2008 ▸), SHELXL2013 (Sheldrick, 2015 ▸), OLEX2 (Dolomanov et al., 2009 ▸) and Mercury (Macrae et al., 2008 ▸).

Crystal structure: contains datablock(s) I. DOI: 10.1107/S2056989015017697/su5206sup1.cif Structure factors: contains datablock(s) I. DOI: 10.1107/S2056989015017697/su5206Isup2.hkl CCDC reference: 1426093 Additional supporting information: crystallographic information; 3D view; checkCIF report
C44H35N4O3·2.5C6H6Z = 2
Mr = 863.03F(000) = 912
Triclinic, P1Dx = 1.230 Mg m3
a = 5.7578 (1) ÅMo Kα radiation, λ = 0.71073 Å
b = 18.0559 (4) ÅCell parameters from 12020 reflections
c = 23.3716 (6) Åθ = 1.0–29.1°
α = 105.5870 (13)°µ = 0.08 mm1
β = 93.7408 (13)°T = 123 K
γ = 92.6002 (14)°Plate, yellow
V = 2330.41 (9) Å30.28 × 0.20 × 0.08 mm
Nonius KappaCCD diffractometer6356 reflections with I > 2σ(I)
fine slicing φ and ω scansRint = 0.109
Absorption correction: multi-scan (SORTAV; Blessing, 1995)θmax = 28.0°, θmin = 1.8°
Tmin = 0.808, Tmax = 1.000h = −7→7
74528 measured reflectionsk = −23→23
11227 independent reflectionsl = −30→30
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.071Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.217H-atom parameters constrained
S = 1.07w = 1/[σ2(Fo2) + (0.0715P)2 + 2.806P] where P = (Fo2 + 2Fc2)/3
11227 reflections(Δ/σ)max < 0.001
587 parametersΔρmax = 0.33 e Å3
1 restraintΔρmin = −0.27 e Å3
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes.
xyzUiso*/Ueq
C10.2370 (5)−0.01295 (16)0.10190 (12)0.0227 (6)
C20.3869 (5)−0.03265 (16)0.15104 (12)0.0228 (6)
C30.4509 (5)−0.10465 (16)0.13551 (13)0.0243 (6)
H30.5452−0.12600.16110.029*
C40.3597 (5)−0.14879 (16)0.07364 (13)0.0258 (6)
C5−0.0104 (5)0.00458 (18)0.11846 (14)0.0299 (7)
H5A−0.10950.00360.08250.045*
H5B−0.00820.05570.14680.045*
H5C−0.0727−0.03430.13670.045*
C60.3447 (5)0.04980 (17)0.07767 (14)0.0294 (7)
H6A0.50160.03680.06610.044*
H6B0.35440.09910.10850.044*
H6C0.24750.05390.04280.044*
C70.4547 (5)0.02506 (17)0.20817 (13)0.0242 (6)
C80.5527 (5)−0.17353 (18)0.03214 (14)0.0319 (7)
H8A0.4832−0.1971−0.00850.048*
H8B0.6441−0.21100.04560.048*
H8C0.6548−0.12840.03260.048*
C90.1932 (5)−0.21795 (18)0.07291 (15)0.0343 (7)
H9A0.0694−0.20060.09930.051*
H9B0.2799−0.25620.08670.051*
H9C0.1238−0.24120.03220.051*
C100.6996 (5)0.04666 (16)0.29676 (13)0.0280 (7)
C110.9052 (6)0.08515 (19)0.29138 (14)0.0358 (7)
H110.96370.07900.25340.043*
C121.0255 (6)0.13289 (19)0.34188 (14)0.0342 (7)
H121.16820.15910.33810.041*
C130.9437 (5)0.14379 (16)0.39818 (13)0.0256 (6)
C140.7358 (5)0.10257 (19)0.40168 (14)0.0330 (7)
H140.67670.10760.43950.040*
C150.6137 (6)0.05439 (19)0.35106 (14)0.0342 (7)
H150.47210.02710.35420.041*
C161.0710 (5)0.19732 (17)0.45189 (13)0.0253 (6)
C171.2858 (6)0.23439 (19)0.44816 (14)0.0360 (8)
H171.34760.22580.41040.043*
C181.4098 (6)0.2824 (2)0.49680 (14)0.0361 (8)
H181.55460.30670.49220.043*
C191.3264 (5)0.29639 (17)0.55323 (13)0.0285 (7)
C201.1098 (6)0.2615 (2)0.55805 (14)0.0366 (8)
H201.04670.27110.59570.044*
C210.9861 (5)0.21278 (19)0.50809 (14)0.0345 (7)
H210.83950.18930.51230.041*
C221.4677 (5)0.34418 (17)0.60378 (14)0.0299 (7)
C231.6001 (5)0.38338 (17)0.64283 (13)0.0288 (7)
C241.7619 (5)0.43207 (17)0.68813 (13)0.0273 (6)
C251.9752 (5)0.45919 (17)0.67281 (13)0.0296 (7)
H252.01130.44550.63240.036*
C262.1331 (5)0.50571 (17)0.71624 (13)0.0285 (7)
H262.27550.52420.70510.034*
C272.0868 (5)0.52596 (15)0.77632 (13)0.0235 (6)
C281.8728 (5)0.49925 (16)0.79124 (13)0.0256 (6)
H281.83680.51290.83170.031*
C291.7132 (5)0.45334 (16)0.74799 (13)0.0265 (6)
H291.56890.43610.75910.032*
C302.2616 (5)0.57301 (15)0.82326 (12)0.0230 (6)
C312.4348 (5)0.62120 (16)0.80997 (13)0.0247 (6)
H312.43640.62780.77100.030*
C322.6059 (5)0.65965 (16)0.85480 (12)0.0241 (6)
C332.4383 (5)0.60956 (16)0.92376 (13)0.0240 (6)
C342.2643 (5)0.56824 (16)0.88191 (12)0.0244 (6)
H342.14820.53700.89310.029*
C352.7986 (5)0.70819 (16)0.84142 (13)0.0249 (6)
C362.9585 (5)0.75177 (17)0.88581 (14)0.0292 (7)
H362.94160.75380.92640.035*
C373.1439 (5)0.79252 (17)0.87052 (14)0.0310 (7)
H373.25530.82280.90040.037*
C383.1634 (6)0.78823 (18)0.81163 (14)0.0337 (7)
H383.28980.81460.79960.040*
C392.9941 (6)0.7444 (2)0.77017 (15)0.0388 (8)
H393.00710.74210.72940.047*
C402.4478 (5)0.60351 (15)0.98644 (12)0.0236 (6)
C412.6483 (5)0.62869 (17)1.02509 (13)0.0279 (6)
H412.78440.64821.01170.033*
C422.6446 (6)0.62468 (18)1.08338 (13)0.0320 (7)
H422.77650.64291.11110.038*
C432.4456 (6)0.59362 (18)1.10055 (14)0.0333 (7)
H432.43840.58981.14020.040*
C442.2573 (6)0.56820 (18)1.05891 (14)0.0324 (7)
H442.12240.54611.07090.039*
C450.4296 (6)0.3900 (2)0.35899 (16)0.0421 (8)
H450.28950.38890.33490.050*
C460.4922 (7)0.4522 (2)0.40689 (16)0.0465 (9)
H460.39340.49380.41630.056*
C470.6977 (7)0.4549 (2)0.44152 (17)0.0527 (10)
H470.74160.49840.47430.063*
C480.8395 (7)0.3934 (3)0.42804 (18)0.0557 (11)
H480.98120.39480.45160.067*
C490.7751 (7)0.3310 (2)0.38076 (17)0.0507 (10)
H490.87130.28870.37170.061*
C500.5700 (7)0.3294 (2)0.34612 (16)0.0446 (9)
H500.52620.28610.31320.053*
C510.7877 (6)0.84135 (17)0.29690 (18)0.101 (2)
H510.68610.87790.31700.121*
C520.9878 (6)0.86602 (14)0.27527 (19)0.0911 (18)
H521.02300.91950.28050.109*
C531.1364 (5)0.8125 (2)0.24592 (18)0.097 (2)
H531.27320.82930.23110.117*
C541.0849 (6)0.73429 (18)0.23820 (15)0.0828 (16)
H541.18640.69770.21810.099*
C550.8848 (6)0.70963 (13)0.25983 (16)0.0666 (13)
H550.84950.65620.25460.080*
C560.7362 (5)0.76315 (19)0.28918 (17)0.0800 (16)
H560.59940.74630.30400.096*
C571.2877 (8)0.0159 (4)0.4782 (3)0.0794 (17)
H571.14030.02700.46290.095*
C581.3994 (10)0.0665 (3)0.5279 (3)0.0766 (15)
H581.32910.11220.54710.092*
C591.6137 (11)0.0509 (4)0.5499 (3)0.0865 (17)
H591.69280.08600.58410.104*
N10.2293 (4)−0.08860 (14)0.05611 (11)0.0272 (5)
N22.6094 (4)0.65448 (13)0.91102 (10)0.0233 (5)
N32.8130 (5)0.70501 (16)0.78374 (11)0.0348 (6)
N42.2537 (4)0.57284 (14)1.00265 (11)0.0286 (6)
O10.1208 (4)−0.10055 (12)0.00485 (9)0.0358 (5)
O20.4049 (4)0.09116 (12)0.22097 (9)0.0312 (5)
O30.5864 (4)−0.00577 (12)0.24535 (9)0.0334 (5)
U11U22U33U12U13U23
C10.0219 (14)0.0236 (14)0.0216 (14)0.0012 (11)0.0000 (11)0.0047 (11)
C20.0209 (13)0.0238 (14)0.0228 (14)−0.0039 (11)0.0002 (11)0.0064 (11)
C30.0219 (14)0.0243 (15)0.0258 (15)−0.0022 (11)−0.0030 (11)0.0070 (12)
C40.0251 (14)0.0224 (14)0.0275 (15)−0.0001 (12)−0.0033 (12)0.0041 (12)
C50.0238 (15)0.0324 (17)0.0300 (17)−0.0001 (13)−0.0004 (12)0.0036 (13)
C60.0287 (15)0.0310 (16)0.0288 (16)−0.0024 (13)−0.0009 (12)0.0104 (13)
C70.0213 (14)0.0265 (16)0.0251 (15)−0.0022 (12)−0.0008 (11)0.0087 (12)
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C1—C51.526 (4)C31—H310.9500
C1—C61.522 (4)C31—C321.401 (4)
C1—N11.489 (4)C32—C351.483 (4)
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C2—C71.473 (4)C33—C341.389 (4)
C3—H30.9500C33—C401.496 (4)
C3—C41.498 (4)C33—N21.346 (4)
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C4—N11.479 (4)C35—N31.342 (4)
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C5—H5B0.9800C36—C371.389 (4)
C5—H5C0.9800C37—H370.9500
C6—H6A0.9800C37—C381.370 (4)
C6—H6B0.9800C38—H380.9500
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C8—H8B0.9800C40—N41.346 (4)
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C9—H9B0.9800C42—H420.9500
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C12—H120.9500C45—C461.371 (5)
C12—C131.394 (4)C45—C501.370 (5)
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C25—C261.384 (4)C57—H570.9500
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C28—C291.383 (4)C59—H590.9500
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C2—C1—C6114.8 (2)C28—C29—H29119.6
C6—C1—C5110.6 (2)C31—C30—C27121.5 (3)
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N1—C1—C5108.9 (2)C34—C30—C31117.4 (2)
N1—C1—C6109.8 (2)C30—C31—H31120.4
C3—C2—C1112.7 (2)C30—C31—C32119.2 (3)
C3—C2—C7125.8 (3)C32—C31—H31120.4
C7—C2—C1121.4 (2)C31—C32—C35120.5 (3)
C2—C3—H3123.3N2—C32—C31123.3 (3)
C2—C3—C4113.4 (3)N2—C32—C35116.2 (2)
C4—C3—H3123.3C34—C33—C40120.2 (2)
C3—C4—C8113.1 (2)N2—C33—C34123.6 (3)
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N1—C4—C399.6 (2)C33—C34—C30119.4 (3)
N1—C4—C8110.1 (2)C33—C34—H34120.3
N1—C4—C9110.2 (2)C36—C35—C32121.6 (3)
C1—C5—H5A109.5N3—C35—C32116.1 (2)
C1—C5—H5B109.5N3—C35—C36122.3 (3)
C1—C5—H5C109.5C35—C36—H36120.3
H5A—C5—H5B109.5C35—C36—C37119.4 (3)
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H5B—C5—H5C109.5C36—C37—H37120.6
C1—C6—H6A109.5C38—C37—C36118.9 (3)
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C1—C6—H6C109.5C37—C38—H38120.9
H6A—C6—H6B109.5C37—C38—C39118.1 (3)
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C4—C8—H8C109.5C40—C41—H41120.7
H8A—C8—H8B109.5C42—C41—C40118.6 (3)
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H8B—C8—H8C109.5C41—C42—H42120.6
C4—C9—H9A109.5C43—C42—C41118.8 (3)
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C4—C9—H9C109.5C42—C43—H43120.7
H9A—C9—H9B109.5C44—C43—C42118.7 (3)
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C10—C11—H11120.4C50—C45—H45120.2
C10—C11—C12119.2 (3)C50—C45—C46119.7 (4)
C12—C11—H11120.4C45—C46—H46119.7
C11—C12—H12119.0C45—C46—C47120.5 (4)
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C14—C13—C16121.7 (3)C47—C48—H48120.1
C13—C14—H14119.3C49—C48—C47119.9 (4)
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C15—C14—H14119.3C48—C49—H49120.0
C10—C15—C14119.3 (3)C48—C49—C50120.0 (4)
C10—C15—H15120.4C50—C49—H49120.0
C14—C15—H15120.4C45—C50—C49120.4 (4)
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C21—C16—C17116.6 (3)C52—C51—H51120.0
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C19—C18—H18119.6C52—C53—H53120.0
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C18—C19—C22119.1 (3)C54—C53—H53120.0
C20—C19—C22122.9 (3)C53—C54—H54120.0
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C21—C20—C19120.4 (3)C55—C54—H54120.0
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C16—C21—H21119.1C54—C55—C56120.0
C20—C21—C16121.8 (3)C56—C55—H55120.0
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C23—C22—C19174.6 (3)C55—C56—C51120.0
C22—C23—C24177.8 (3)C55—C56—H56120.0
C25—C24—C23120.0 (3)C58—C57—H57119.6
C29—C24—C23121.5 (3)C58—C57—C59i120.8 (5)
C29—C24—C25118.5 (3)C59i—C57—H57119.6
C24—C25—H25119.8C57—C58—H58120.1
C26—C25—C24120.4 (3)C57—C58—C59119.8 (5)
C26—C25—H25119.8C59—C58—H58120.1
C25—C26—H26119.4C57i—C59—H59120.3
C25—C26—C27121.2 (3)C58—C59—C57i119.4 (6)
C27—C26—H26119.4C58—C59—H59120.3
C26—C27—C28118.1 (3)C4—N1—C1115.5 (2)
C26—C27—C30121.1 (3)O1—N1—C1122.4 (2)
C28—C27—C30120.8 (3)O1—N1—C4122.1 (2)
C27—C28—H28119.5C32—N2—C33117.1 (2)
C29—C28—C27121.0 (3)C39—N3—C35117.2 (3)
C29—C28—H28119.5C44—N4—C40117.0 (3)
C24—C29—H29119.6C7—O3—C10116.5 (2)
C1—C2—C3—C4−0.1 (3)C27—C30—C31—C32−175.1 (3)
C1—C2—C7—O2−1.5 (4)C27—C30—C34—C33176.3 (3)
C1—C2—C7—O3179.4 (2)C28—C27—C30—C31−158.0 (3)
C2—C1—N1—C4−0.5 (3)C28—C27—C30—C3424.6 (4)
C2—C1—N1—O1−179.4 (2)C29—C24—C25—C260.2 (5)
C2—C3—C4—C8116.6 (3)C30—C27—C28—C29−177.8 (3)
C2—C3—C4—C9−116.8 (3)C30—C31—C32—C35177.0 (3)
C2—C3—C4—N1−0.2 (3)C30—C31—C32—N2−2.0 (4)
C2—C7—O3—C10168.2 (2)C31—C30—C34—C33−1.2 (4)
C3—C2—C7—O2176.4 (3)C31—C32—C35—C36174.6 (3)
C3—C2—C7—O3−2.6 (4)C31—C32—C35—N3−7.8 (4)
C3—C4—N1—C10.4 (3)C31—C32—N2—C330.2 (4)
C3—C4—N1—O1179.4 (2)C32—C35—C36—C37176.1 (3)
C5—C1—C2—C3115.3 (3)C32—C35—N3—C39−175.8 (3)
C5—C1—C2—C7−66.5 (3)C33—C40—C41—C42177.4 (3)
C5—C1—N1—C4−118.7 (3)C33—C40—N4—C44−178.8 (3)
C5—C1—N1—O162.4 (3)C34—C30—C31—C322.4 (4)
C6—C1—C2—C3−116.4 (3)C34—C33—C40—C41164.3 (3)
C6—C1—C2—C761.8 (3)C34—C33—C40—N4−15.8 (4)
C6—C1—N1—C4120.0 (3)C34—C33—N2—C321.1 (4)
C6—C1—N1—O1−58.9 (3)C35—C32—N2—C33−178.8 (2)
C7—C2—C3—C4−178.2 (3)C35—C36—C37—C38−0.1 (5)
C8—C4—N1—C1−118.6 (3)C36—C35—N3—C391.8 (5)
C8—C4—N1—O160.4 (3)C36—C37—C38—C391.2 (5)
C9—C4—N1—C1118.8 (3)C37—C38—C39—N3−0.8 (5)
C9—C4—N1—O1−62.3 (4)C38—C39—N3—C35−0.7 (5)
C10—C11—C12—C13−0.6 (5)C40—C33—C34—C30−178.3 (3)
C11—C10—C15—C140.5 (5)C40—C33—N2—C32179.0 (2)
C11—C10—O3—C7−80.9 (4)C40—C41—C42—C432.1 (4)
C11—C12—C13—C141.5 (5)C41—C40—N4—C441.1 (4)
C11—C12—C13—C16−178.0 (3)C41—C42—C43—C44−0.4 (5)
C12—C13—C14—C15−1.5 (5)C42—C43—C44—N4−1.1 (5)
C12—C13—C16—C17−4.5 (5)C43—C44—N4—C400.8 (5)
C12—C13—C16—C21176.1 (3)C45—C46—C47—C48−0.9 (6)
C13—C14—C15—C100.5 (5)C46—C45—C50—C49−0.6 (5)
C13—C16—C17—C18−178.4 (3)C46—C47—C48—C490.0 (6)
C13—C16—C21—C20178.4 (3)C47—C48—C49—C500.6 (6)
C14—C13—C16—C17176.0 (3)C48—C49—C50—C45−0.3 (5)
C14—C13—C16—C21−3.4 (5)C50—C45—C46—C471.2 (5)
C15—C10—C11—C12−0.5 (5)C51—C52—C53—C540.0
C15—C10—O3—C7103.6 (3)C52—C51—C56—C550.0
C16—C13—C14—C15178.0 (3)C52—C53—C54—C550.0
C16—C17—C18—C190.4 (5)C53—C54—C55—C560.0
C17—C16—C21—C20−1.0 (5)C54—C55—C56—C510.0
C17—C18—C19—C20−1.8 (5)C56—C51—C52—C530.0
C17—C18—C19—C22176.8 (3)C57—C58—C59—C57i−0.5 (8)
C18—C19—C20—C211.8 (5)C59i—C57—C58—C590.5 (8)
C19—C20—C21—C16−0.4 (5)N1—C1—C2—C30.4 (3)
C21—C16—C17—C181.0 (5)N1—C1—C2—C7178.5 (2)
C22—C19—C20—C21−176.7 (3)N2—C32—C35—C36−6.4 (4)
C23—C24—C25—C26−179.5 (3)N2—C32—C35—N3171.3 (3)
C23—C24—C29—C28178.9 (3)N2—C33—C34—C30−0.5 (4)
C24—C25—C26—C271.0 (5)N2—C33—C40—C41−13.7 (4)
C25—C24—C29—C28−0.8 (4)N2—C33—C40—N4166.2 (2)
C25—C26—C27—C28−1.5 (4)N3—C35—C36—C37−1.5 (5)
C25—C26—C27—C30177.1 (3)N4—C40—C41—C42−2.5 (4)
C26—C27—C28—C290.9 (4)O2—C7—O3—C10−10.8 (4)
C26—C27—C30—C3123.4 (4)O3—C10—C11—C12−175.9 (3)
C26—C27—C30—C34−154.0 (3)O3—C10—C15—C14175.9 (3)
C27—C28—C29—C240.3 (4)
D—H···AD—HH···AD···AD—H···A
C37—H37···O1iii0.952.653.228 (4)120
C38—H38···O2iv0.952.553.485 (4)169
C6—H6C···O1ii0.982.613.499 (4)151
C9—H9B···Cg4v0.962.793.602 (4)140
C14—H14···Cg10vi0.952.883.608 (4)134
C14—H14···Cg10vii0.952.883.608 (4)134
C55—H55···Cg7viii0.952.903.680 (3)140
  16 in total

1.  Selective measurements of a nitroxide-nitroxide separation of 5 nm and a nitroxide-copper separation of 2.5 nm in a terpyridine-based copper(II) complex by pulse EPR spectroscopy.

Authors:  Evelyn Narr; Adelheid Godt; Gunnar Jeschke
Journal:  Angew Chem Int Ed Engl       Date:  2002-10-18       Impact factor: 15.336

2.  Synthesis and single-crystal X-ray characterization of 4,4"-functionalized 4'-(4-bromophenyl)-2,2':6',2"-terpyridines.

Authors:  Ibrahim Eryazici; Charles N Moorefield; Semih Durmus; George R Newkome
Journal:  J Org Chem       Date:  2006-02-03       Impact factor: 4.354

Review 3.  Studying biomolecular complexes with pulsed electron-electron double resonance spectroscopy.

Authors:  Gunnar W Reginsson; Olav Schiemann
Journal:  Biochem Soc Trans       Date:  2011-01       Impact factor: 5.407

4.  Highly practical copper(I)/TEMPO catalyst system for chemoselective aerobic oxidation of primary alcohols.

Authors:  Jessica M Hoover; Shannon S Stahl
Journal:  J Am Chem Soc       Date:  2011-10-03       Impact factor: 15.419

5.  Silica-supported TEMPO catalysts: synthesis and application in the Anelli oxidation of alcohols.

Authors:  T Fey; H Fischer; S Bachmann; K Albert; C Bolm
Journal:  J Org Chem       Date:  2001-11-30       Impact factor: 4.354

6.  An empirical correction for absorption anisotropy.

Authors:  R H Blessing
Journal:  Acta Crystallogr A       Date:  1995-01-01       Impact factor: 2.290

7.  Exchange coupling mediated through-bonds and through-space in conformationally constrained polyradical scaffolds: calix[4]arene nitroxide tetraradicals and diradical.

Authors:  Andrzej Rajca; Sumit Mukherjee; Maren Pink; Suchada Rajca
Journal:  J Am Chem Soc       Date:  2006-10-18       Impact factor: 15.419

8.  Biphenyl-4,4'-diyl bis-(2,2,5,5-tetra-methyl-1-oxyl-3-pyrroline-3-carboxyl-ate).

Authors:  Dominik Margraf; Denise Schuetz; Thomas F Prisner; Jan W Bats
Journal:  Acta Crystallogr Sect E Struct Rep Online       Date:  2009-07-04

9.  PELDOR measurements on a nitroxide-labeled Cu(II) porphyrin: orientation selection, spin-density distribution, and conformational flexibility.

Authors:  Bela E Bode; Jörn Plackmeyer; Thomas F Prisner; Olav Schiemann
Journal:  J Phys Chem A       Date:  2008-05-20       Impact factor: 2.781

10.  Crystal structure refinement with SHELXL.

Authors:  George M Sheldrick
Journal:  Acta Crystallogr C Struct Chem       Date:  2015-01-01       Impact factor: 1.172

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  2 in total

1.  Synthesis of Nanometer Sized Bis- and Tris-trityl Model Compounds with Different Extent of Spin-Spin Coupling.

Authors:  J Jacques Jassoy; Andreas Meyer; Sebastian Spicher; Christine Wuebben; Olav Schiemann
Journal:  Molecules       Date:  2018-03-17       Impact factor: 4.411

2.  Verdazyls as Possible Building Blocks for Multifunctional Molecular Materials: A Case Study on 1,5-Diphenyl-3-(p-iodophenyl)-verdazyl Focusing on Magnetism, Electron Transfer and the Applicability of the Sonogashira-Hagihara Reaction.

Authors:  Hannah Jobelius; Norbert Wagner; Gregor Schnakenburg; Andreas Meyer
Journal:  Molecules       Date:  2018-07-18       Impact factor: 4.411

  2 in total

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