Crystal structure and Hirshfeld surface analysis of 2,2''',6,6'''-tetra-meth-oxy-3,2':5',3'':6'',3'''-quaterpyridine.

In the title compound, C24H22N4O4, the four pyridine rings are tilted slightly with respect to each other. The dihedral angles between the inner and outer pyridine rings are 12.51 (8) and 9.67 (9)°, while that between inner pyridine rings is 20.10 (7)°. Within the mol-ecule, intra-molecular C-H⋯O and C-H⋯N contacts are observed. In the crystal, adjacent mol-ecules are linked by π-π stacking inter-actions between pyridine rings and weak C-H⋯π inter-actions between a methyl H atom and the centroid of a pyridine ring, forming a two-dimensional layer structure extending parallel to the ac plane. Hirshfeld surface analysis and two-dimensional fingerprint plots indicate that the most important contributions to the crystal packing are from H⋯H (52.9%) and H⋯C/C⋯H (17.3%) contacts. © Moon et al. 2019.

Chemical context

Polypyridines are considered to be strong and versatile chelating ligands for transition-metal ions (Adamski et al., 2014 ▸). This chelating nature provides complexes with diverse architectures possessing unique and useful photophysical properties (Zhong et al., 2013 ▸). Many structural studies of bi- and terpyridine-based metal complexes have been undertaken over the last decades (Kaes et al., 2000 ▸). When bi- or terpyridines are used as building blocks, sophisticated architectures such as helicates and cages can be obtained by self-assembly (Yeung et al., 2011 ▸; Glasson et al., 2008b ▸). Although there are number of examples of bi- and terpyridine-based metal complexes with different geometries, structural reports of linear-type quaterpyridines are still scarce (Glasson et al., 2011b ▸). Organic compounds bearing 2,3′-bi­pyridine have attracted much inter­est because of their unique properties such as proper coordination modes to late transition-metal ions and high triplet energy. As a result of these characteristics, they are widely used as ligands to develop blue phospho­rescent materials (Zaen et al., 2019 ▸; Lee et al., 2018 ▸). However, no reports of a 2,3′-bi­pyridine-based quaterpyridine with a linear geometry have been published to date. Herein, we describe the mol­ecular and crystal structures of the title compound, which can act as a potential multidentate ligand to various transition-metal ions. The mol­ecular packing of the title compound was further examined with the aid of a Hirshfeld surface analysis.

Structural commentary

The mol­ecular structure of the title compound is shown in Fig. 1 ▸. Within the mol­ecule, short intra­molecular C—H⋯O and C—H⋯N contacts (Table 1 ▸) enclose S(6) and S(5) rings, respectively, and may contribute to the planarity between outer and inner pyridine rings. The dihedral angles between the outer and inner pyridine rings are 12.51 (8)° (between rings N1/C1–C5 and N2/C6-C10) and 9.67 (9)° (between rings N3/C11–C15 and N4/C16–C20). However the two inner pyridine rings (N2/C6–C10 and N3/C11–C15) are slightly tilted by 20.10 (7)° with respect to each other. This may be due to the steric hindrance between atoms H8 and H11 and between H10 and H13.

Figure 1

A view of the mol­ecular structure of the title compound, showing the atom-numbering scheme. Displacement ellipsoids are drawn at the 50% probability level. The intra­molecular C—H⋯O/N contacts are shown as yellow dashed lines.

Table 1

Hydrogen-bond geometry (Å, °)

Cg3 is the centroid of the N3/C11–C15 ring.

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
C7—H7⋯O1	0.94	2.20	2.808 (2)	122
C4—H4⋯N2	0.94	2.41	2.760 (2)	102
C14—H14⋯O4	0.94	2.16	2.808 (2)	125
C17—H17⋯N3	0.94	2.40	2.752 (2)	102
C22—H22C⋯Cg3i	0.97	2.78	3.579 (2)	140

Symmetry code: (i) .

Supra­molecular features

In the crystal, adjacent mol­ecules are linked by π–π stacking inter­actions between pyridine rings [Cg1⋯Cg3iii = 3.6600 (10) Å; Cg1⋯Cg4ii = 3.8249 (10) Å; Cg2⋯Cg4iii = 3.9270 (10) Å; Cg1, Cg2, Cg3, and Cg4 are the centroids of the N1/C1–C5, N2/C6–C10, N3/C11–C15, and N4/C16–C20 rings, respectively; symmetry codes: (ii) x + 1, −y + , z − , (iii) x, −y + , z − ], resulting in the formation of a two-dimensional layer structure extending parallel to the ac plane, as shown in Fig. 2 ▸. The layer is further stabilized by weak C—H⋯π inter­actions (Table 1 ▸, yellow dashed lines in Fig. 2 ▸) between (meth­yl)H22C⋯Cg3i [Cg3 is the centroid of the N3/C11–C15 ring; symmetry code as in Table 1 ▸]. No inter­actions between the layers are observed.

Figure 2

The two-dimensional supra­molecular network formed through π–π stacking inter­actions (black dashed lines) and inter­molecular C—H⋯π inter­actions (yellow dashed lines). For clarity, H atoms not involved in the inter­molecular inter­actions have been omitted.

Hirshfeld surface analysis

Hirshfeld surface analysis was performed using CrystalExplorer (Turner et al., 2017 ▸) to qu­antify and visualize the various inter­molecular close contacts in the mol­ecular packing of the title compound. The Hirshfeld surface shown in Fig. 3 ▸ was calculated using a standard (high) surface resolution with the three-dimensional d norm surface mapped over a fixed colour scale of −0.1883 (red) to 1.2065 (blue) a.u.. In Fig. 3 ▸, except for three light-red spots, the overall surface mapped over d norm is covered by white and blue colours, indicating that the distances between the contact atoms in inter­molecular contacts are nearly the same as the sum of their van der Waals radii or longer. The light-red spots on the surface indicate the closest inter­molecular H⋯H and C⋯H contacts [H14⋯H18(−x + 1, y − , −z + ) = 2.19 Å, C6⋯H24C(x + 1, −y + , z − ) = 2.78 Å.

Figure 3

A view of the Hirshfeld surfaced of the title compound mapped over d norm showing inter­molecular H⋯H and C⋯H contacts using a fixed colour scale of −0.1883 (red) to 1.2065 (blue) a.u. [Symmetry codes: (i) −x + 1, y − , −z + ; (ii) −x + 1, y + , −z + ; (iii) x + 1, −y + , z − .]

The overall two-dimensional fingerprint plot and those delineated into H⋯H, H⋯C/C⋯H, H⋯O/O⋯H, C⋯C, and C⋯N/N⋯C contacts are shown in Fig. 4 ▸ a–f, respectively. The most widely scattered points in the fingerprint plot are related to H⋯H contacts, Fig. 4 ▸ b, which make a 52.9% contribution to the Hirshfeld surface. The second largest contribution (17.3%) is by H⋯C/C⋯H contacts (Fig. 4 ▸ c). The H⋯O/O⋯H (9.4%), C⋯C (6.4%), C⋯N/N⋯C (5.4%), H⋯N/N⋯H (5.0%), and C⋯O/O⋯C (2.2%) contacts also make significant contributions to the Hirshfeld surface while the N⋯O/O⋯N (0.7%), O⋯O (0.7%), and N⋯N (0.1%) contacts have a negligible influence on the mol­ecular packing.

Figure 4

(a) The full two-dimensional fingerprint plot for the title compound and those delineated into (b) H⋯H, (c) H⋯C/C⋯H, (d) H···O/O⋯H, (e) C⋯C, and (f) C⋯N/N⋯C contacts. The d i and d e values are the closest inter­nal and external distances (in Å) from given points on the Hirshfeld surface contacts.

Database survey

Although a search of the Cambridge Structural Database (CSD Version 5.40, last update Feb 2019; Groom et al., 2016 ▸) for 3,2′:5′,3′′:6′′,3′′′-quaterpyridine, which is the title compound without the meth­oxy substituents, and 4,2′:5′,3′′:6′′,4′′′-quaterpyridine gave no hits, that for 2,2′:5′,3′′:6′′,2′′′-quaterpyridine gave ten hits. One (CIHJUB: Luis et al., 2018 ▸) is 2,2′:5′,3′′:6′′,2′′′-quaterpyridine and eight are AgI (GIWKAY: Baxter et al., 1999 ▸), CuI (WAHKOF: Baxter et al., 1993 ▸), RuII (TOMROD: Glasson et al., 2008a ▸), or FeII [(OMAMEV: Glasson et al., 2011 RIXYON, RIXZAA and RIXYUT: Glasson et al., 2008b ▸) complexes involving the 2,2′:5′,3′′:6′′,2′′′-quaterpyridine ligand with methyl substituents. The remaining one (REHVAB: Baxter et al., 1997 ▸) is a CuI complex involving the ligand 2,2′:5′,3′′:6′′,2′′′-quaterpyridine with phenyl substituents.

Synthesis and crystallization

All experiments were performed under a dry N2 atmosphere using standard Schlenk techniques. All solvents were freshly distilled over appropriate drying reagents prior to use. All starting materials were purchased commercially and used without further purification. The 1H NMR spectrum was recorded on a JEOL 400 MHz spectrometer. The two starting materials, 5-bromo-2′,6′-dimeth­oxy-2,3′-bi­pyridine and 2′,6′-dimeth­oxy-5-(4,4,5,5,-tetra­methyl-1,3,2-dioxaborolan-2-yl)-2,3′-bi­pyridine were synthesized according to a slight modification of the previous synthetic methodology reported by our group (Zaen et al., 2019 ▸). Details of the synthetic procedures and reagents are presented in Fig. 5 ▸.

Figure 5

Synthetic routes and reagents to obtain the title compound: (i) Pd(PPh3)4 (5 mol%), K3PO4 (6 eq), THF/H2O, 373 K, 24 h.

To a 100 ml Schlenk flask were added 5-bromo-2′,6′-dimeth­oxy-2,3′-bi­pyridine (0.46 g, 1.55 mmol), 2′,6′-dimeth­oxy-5-(4,4,5,5,-tetra­methyl-1,3,2-dioxaborolan-2-yl)-2,3′-bi­pyridine (0.64 g, 1.86 mmol), Pd(PPh3)4 (0.09 g, 0.08 mmol), and K3PO4 (2.13 g, 9.28 mmol). The flask was evacuated and back-filled with nitro­gen and THF/H2O (12 ml/9.8 ml) was added under an N2 atmosphere, and the reaction mixture was stirred at 373 K under nitro­gen for 24 h. After cooling to room temperature, the mixture was poured into 100 ml of water and extracted with ethyl acetate (50 ml × 3). The organic layers were combined and then dried with anhydrous MgSO4 and concentrated under reduced pressure. Purification by column chromatography (ethyl­acetate:hexane 1:1, v/v) afford the desired product as a yellow solid (0.33 g, 50%). Pale-yellow crystals were obtained by slow evaporation of a di­chloro­methane/hexane solution of the title compound. 1H NMR (400 MHz, CDCl3) δ 8.91 (dd, J = 2.0 Hz, 2H), 8.32 (d, J = 8.4 Hz, 2H), 8.10 (d, J = 7.6 Hz, 2H), 7.93 (dd, J = 8.4, 2.4 Hz, 2H), 6.47 (d, J = 8.0 Hz, 2H), 6.47 (d, J = 8.0 Hz, 2H), 4.06 (s, 3H), 3.99 (s, 3H); 13C NMR(100 MHz, CDCl3) δ 163.3, 160.2, 153.8, 147.5, 142.2, 134.2, 130.9, 123.9, 113.8, 102.2, 53.8, 53.6. Analysis calculated for C24H22N4O4: C 66.97, H 5.15, N 13.02%; found: C 66.93, H 5.12, N 13.06%.

Refinement

Crystal data, data collection and structure refinement details are summarized in Table 2 ▸. All H atoms were positioned geometrically and refined using a riding model: C—H = 0.94–0.97 Å with U iso(H) = 1.5U eq(C-meth­yl) and 1.2U eq(C) for other H atoms.

Table 2

Experimental details

Crystal data
Chemical formula	C24H22N4O4
M r	430.45
Crystal system, space group	Monoclinic, P21/c
Temperature (K)	223
a, b, c (Å)	7.9556 (6), 14.8583 (11), 17.3362 (12)
β (°)	95.556 (4)
V (Å3)	2039.6 (3)
Z	4
Radiation type	Mo Kα
μ (mm−1)	0.10
Crystal size (mm)	0.25 × 0.24 × 0.07
Data collection
Diffractometer	Bruker APEXII CCD
Absorption correction	Multi-scan (SADABS; Bruker, 2014 ▸)
T min, T max	0.673, 0.746
No. of measured, independent and observed [I > 2σ(I)] reflections	19298, 5090, 3739
R int	0.030
(sin θ/λ)max (Å−1)	0.668
Refinement
R[F 2 > 2σ(F 2)], wR(F 2), S	0.054, 0.160, 1.04
No. of reflections	5090
No. of parameters	289
H-atom treatment	H-atom parameters constrained
Δρmax, Δρmin (e Å−3)	0.52, −0.24

Computer programs: APEX2 and SAINT (Bruker, 2014 ▸), SHELXS97 and SHELXTL (Sheldrick, 2008 ▸), SHELXL2014/7 (Sheldrick, 2015 ▸), DIAMOND (Brandenburg, 2010 ▸) and publCIF (Westrip, 2010 ▸).

Crystal structure: contains datablock(s) I, New_Global_Publ_Block. DOI: 10.1107/S205698901901274X/su5516sup1.cif

Structure factors: contains datablock(s) I. DOI: 10.1107/S205698901901274X/su5516Isup2.hkl

Click here for additional data file.

Supporting information file. DOI: 10.1107/S205698901901274X/su5516Isup3.cml

CCDC reference: 1953451

Additional supporting information: crystallographic information; 3D view; checkCIF report

C24H22N4O4	F(000) = 904
Mr = 430.45	Dx = 1.402 Mg m−3
Monoclinic, P21/c	Mo Kα radiation, λ = 0.71073 Å
a = 7.9556 (6) Å	Cell parameters from 5328 reflections
b = 14.8583 (11) Å	θ = 2.6–27.8°
c = 17.3362 (12) Å	µ = 0.10 mm−1
β = 95.556 (4)°	T = 223 K
V = 2039.6 (3) Å3	Plate, yellow
Z = 4	0.25 × 0.24 × 0.07 mm

Bruker APEXII CCD diffractometer	3739 reflections with I > 2σ(I)
φ and ω scans	Rint = 0.030
Absorption correction: multi-scan (SADABS; Bruker, 2014)	θmax = 28.4°, θmin = 1.8°
Tmin = 0.673, Tmax = 0.746	h = −10→10
19298 measured reflections	k = −17→19
5090 independent reflections	l = −23→23

Refinement on F2	Primary atom site location: structure-invariant direct methods
Least-squares matrix: full	Secondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.054	Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.160	H-atom parameters constrained
S = 1.04	w = 1/[σ2(Fo2) + (0.0773P)2 + 0.5757P] where P = (Fo2 + 2Fc2)/3
5090 reflections	(Δ/σ)max < 0.001
289 parameters	Δρmax = 0.52 e Å−3
0 restraints	Δρmin = −0.24 e Å−3

Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.

	x	y	z	Uiso*/Ueq
O1	0.95531 (17)	0.30630 (8)	0.18517 (7)	0.0449 (3)
O2	1.11979 (18)	0.05085 (9)	0.06420 (7)	0.0518 (3)
O3	0.3179 (2)	0.49944 (9)	0.92984 (8)	0.0598 (4)
O4	0.34148 (15)	0.25399 (7)	0.77125 (7)	0.0414 (3)
N1	1.03508 (18)	0.17731 (10)	0.12555 (8)	0.0393 (3)
N2	0.8189 (2)	0.15075 (10)	0.37266 (9)	0.0473 (4)
N3	0.5594 (2)	0.41616 (10)	0.60438 (8)	0.0446 (4)
N4	0.33254 (18)	0.37725 (10)	0.84952 (8)	0.0394 (3)
C1	0.9663 (2)	0.21499 (11)	0.18490 (9)	0.0384 (4)
C2	1.0519 (2)	0.08936 (12)	0.12445 (10)	0.0417 (4)
C3	1.0021 (2)	0.03287 (13)	0.18274 (11)	0.0464 (4)
H3	1.0169	−0.0299	0.1812	0.056*
C4	0.9309 (2)	0.07415 (11)	0.24195 (10)	0.0391 (4)
H4	0.8953	0.0382	0.2819	0.047*
C5	0.9084 (2)	0.16701 (12)	0.24608 (9)	0.0385 (4)
C6	0.8322 (2)	0.20736 (12)	0.31288 (9)	0.0378 (4)
C7	0.7761 (2)	0.29583 (12)	0.31670 (10)	0.0426 (4)
H7	0.7840	0.3347	0.2744	0.051*
C8	0.7093 (2)	0.32678 (12)	0.38209 (10)	0.0416 (4)
H8	0.6730	0.3868	0.3845	0.050*
C9	0.6954 (2)	0.26934 (11)	0.44454 (9)	0.0362 (4)
C10	0.7519 (2)	0.18211 (13)	0.43460 (10)	0.0461 (4)
H10	0.7420	0.1415	0.4755	0.055*
C11	0.6163 (2)	0.38702 (12)	0.53909 (10)	0.0454 (4)
H11	0.6530	0.4306	0.5052	0.055*
C12	0.6258 (2)	0.29739 (11)	0.51692 (9)	0.0352 (3)
C13	0.5675 (2)	0.23564 (12)	0.56830 (10)	0.0443 (4)
H13	0.5692	0.1739	0.5567	0.053*
C14	0.5075 (2)	0.26401 (12)	0.63572 (10)	0.0441 (4)
H14	0.4672	0.2217	0.6698	0.053*
C15	0.5059 (2)	0.35488 (11)	0.65387 (9)	0.0350 (3)
C16	0.4526 (2)	0.39106 (11)	0.72707 (9)	0.0363 (4)
C17	0.4828 (3)	0.48144 (12)	0.74535 (11)	0.0464 (4)
H17	0.5351	0.5179	0.7103	0.056*
C18	0.4387 (3)	0.51856 (13)	0.81250 (12)	0.0564 (5)
H18	0.4592	0.5796	0.8241	0.068*
C19	0.3625 (2)	0.46282 (12)	0.86309 (10)	0.0455 (4)
C20	0.3758 (2)	0.34235 (11)	0.78363 (9)	0.0350 (4)
C21	1.0326 (3)	0.35294 (14)	0.12610 (11)	0.0546 (5)
H21A	1.0169	0.4172	0.1320	0.082*
H21B	1.1524	0.3393	0.1304	0.082*
H21C	0.9813	0.3340	0.0757	0.082*
C22	1.1533 (3)	0.10987 (14)	0.00148 (10)	0.0497 (5)
H22A	1.2017	0.0755	−0.0385	0.075*
H22B	1.0487	0.1375	−0.0200	0.075*
H22C	1.2321	0.1563	0.0208	0.075*
C23	0.2306 (3)	0.44212 (15)	0.97894 (12)	0.0624 (6)
H23A	0.2054	0.4753	1.0246	0.094*
H23B	0.1261	0.4215	0.9510	0.094*
H23C	0.3010	0.3907	0.9945	0.094*
C24	0.2705 (2)	0.20561 (12)	0.83165 (11)	0.0444 (4)
H24A	0.2518	0.1435	0.8159	0.067*
H24B	0.3477	0.2077	0.8785	0.067*
H24C	0.1638	0.2328	0.8415	0.067*

	U11	U22	U33	U12	U13	U23
O1	0.0596 (8)	0.0332 (6)	0.0437 (7)	−0.0006 (5)	0.0152 (6)	0.0045 (5)
O2	0.0633 (9)	0.0451 (7)	0.0486 (7)	0.0003 (6)	0.0136 (6)	−0.0066 (6)
O3	0.0871 (11)	0.0448 (8)	0.0512 (8)	−0.0013 (7)	0.0261 (7)	−0.0053 (6)
O4	0.0477 (7)	0.0327 (6)	0.0458 (7)	−0.0051 (5)	0.0141 (5)	0.0031 (5)
N1	0.0379 (8)	0.0435 (8)	0.0362 (7)	0.0006 (6)	0.0031 (6)	−0.0048 (6)
N2	0.0558 (10)	0.0450 (9)	0.0424 (8)	0.0017 (7)	0.0119 (7)	0.0060 (6)
N3	0.0571 (9)	0.0351 (8)	0.0430 (8)	−0.0065 (7)	0.0125 (7)	0.0027 (6)
N4	0.0404 (8)	0.0381 (8)	0.0402 (7)	0.0044 (6)	0.0060 (6)	0.0037 (6)
C1	0.0378 (9)	0.0381 (9)	0.0388 (8)	−0.0010 (7)	0.0008 (7)	0.0019 (7)
C2	0.0391 (9)	0.0436 (10)	0.0422 (9)	−0.0023 (7)	0.0028 (7)	−0.0034 (7)
C3	0.0482 (10)	0.0397 (9)	0.0516 (10)	0.0002 (8)	0.0056 (8)	−0.0033 (8)
C4	0.0404 (9)	0.0364 (9)	0.0409 (9)	−0.0018 (7)	0.0062 (7)	0.0055 (7)
C5	0.0361 (9)	0.0390 (9)	0.0399 (9)	−0.0020 (7)	0.0016 (7)	0.0026 (7)
C6	0.0319 (8)	0.0440 (9)	0.0371 (8)	−0.0014 (7)	0.0021 (6)	0.0030 (7)
C7	0.0449 (10)	0.0464 (10)	0.0374 (8)	−0.0006 (8)	0.0084 (7)	0.0101 (7)
C8	0.0433 (10)	0.0393 (9)	0.0433 (9)	0.0033 (7)	0.0100 (7)	0.0065 (7)
C9	0.0310 (8)	0.0426 (9)	0.0352 (8)	−0.0032 (7)	0.0036 (6)	0.0041 (7)
C10	0.0547 (11)	0.0435 (10)	0.0412 (9)	0.0031 (8)	0.0111 (8)	0.0085 (7)
C11	0.0563 (11)	0.0381 (9)	0.0437 (9)	−0.0079 (8)	0.0140 (8)	0.0069 (7)
C12	0.0313 (8)	0.0390 (9)	0.0353 (8)	−0.0020 (6)	0.0025 (6)	0.0041 (6)
C13	0.0553 (11)	0.0335 (9)	0.0464 (9)	−0.0007 (8)	0.0159 (8)	0.0032 (7)
C14	0.0549 (11)	0.0367 (9)	0.0429 (9)	0.0002 (8)	0.0158 (8)	0.0076 (7)
C15	0.0322 (8)	0.0363 (8)	0.0364 (8)	−0.0005 (6)	0.0029 (6)	0.0043 (6)
C16	0.0364 (8)	0.0340 (8)	0.0383 (8)	0.0008 (7)	0.0029 (7)	0.0048 (6)
C17	0.0615 (12)	0.0349 (9)	0.0445 (9)	−0.0049 (8)	0.0138 (8)	0.0045 (7)
C18	0.0851 (15)	0.0332 (9)	0.0532 (11)	−0.0053 (9)	0.0175 (10)	−0.0028 (8)
C19	0.0563 (11)	0.0398 (10)	0.0416 (9)	0.0041 (8)	0.0103 (8)	0.0008 (7)
C20	0.0318 (8)	0.0328 (8)	0.0402 (8)	0.0032 (6)	0.0023 (6)	0.0038 (6)
C21	0.0740 (14)	0.0475 (11)	0.0449 (10)	−0.0004 (9)	0.0183 (9)	0.0089 (8)
C22	0.0585 (12)	0.0524 (11)	0.0399 (9)	−0.0001 (9)	0.0129 (8)	−0.0029 (8)
C23	0.0874 (16)	0.0519 (12)	0.0522 (11)	0.0038 (11)	0.0292 (11)	0.0029 (9)
C24	0.0453 (10)	0.0396 (9)	0.0500 (10)	−0.0034 (8)	0.0134 (8)	0.0097 (7)

O1—C1	1.359 (2)	C9—C12	1.480 (2)
O1—C21	1.425 (2)	C10—H10	0.9400
O2—C2	1.349 (2)	C11—C12	1.390 (2)
O2—C22	1.442 (2)	C11—H11	0.9400
O3—C19	1.357 (2)	C12—C13	1.389 (2)
O3—C23	1.431 (2)	C13—C14	1.371 (2)
O4—C20	1.3538 (19)	C13—H13	0.9400
O4—C24	1.4308 (19)	C14—C15	1.387 (2)
N1—C2	1.314 (2)	C14—H14	0.9400
N1—C1	1.334 (2)	C15—C16	1.478 (2)
N2—C10	1.328 (2)	C16—C17	1.395 (2)
N2—C6	1.347 (2)	C16—C20	1.405 (2)
N3—C11	1.331 (2)	C17—C18	1.364 (3)
N3—C15	1.348 (2)	C17—H17	0.9400
N4—C19	1.311 (2)	C18—C19	1.388 (3)
N4—C20	1.330 (2)	C18—H18	0.9400
C1—C5	1.393 (2)	C21—H21A	0.9700
C2—C3	1.400 (3)	C21—H21B	0.9700
C3—C4	1.365 (2)	C21—H21C	0.9700
C3—H3	0.9400	C22—H22A	0.9700
C4—C5	1.394 (2)	C22—H22B	0.9700
C4—H4	0.9400	C22—H22C	0.9700
C5—C6	1.485 (2)	C23—H23A	0.9700
C6—C7	1.392 (3)	C23—H23B	0.9700
C7—C8	1.377 (2)	C23—H23C	0.9700
C7—H7	0.9400	C24—H24A	0.9700
C8—C9	1.391 (2)	C24—H24B	0.9700
C8—H8	0.9400	C24—H24C	0.9700
C9—C10	1.388 (3)
C1—O1—C21	116.78 (14)	C12—C13—H13	119.7
C2—O2—C22	116.31 (14)	C13—C14—C15	120.29 (16)
C19—O3—C23	116.79 (15)	C13—C14—H14	119.9
C20—O4—C24	117.33 (13)	C15—C14—H14	119.9
C2—N1—C1	118.58 (15)	N3—C15—C14	120.19 (15)
C10—N2—C6	118.06 (15)	N3—C15—C16	115.81 (14)
C11—N3—C15	118.40 (15)	C14—C15—C16	123.97 (15)
C19—N4—C20	118.35 (15)	C17—C16—C20	114.46 (15)
N1—C1—O1	116.91 (15)	C17—C16—C15	119.20 (15)
N1—C1—C5	124.26 (16)	C20—C16—C15	126.31 (15)
O1—C1—C5	118.82 (15)	C18—C17—C16	122.02 (17)
N1—C2—O2	118.82 (16)	C18—C17—H17	119.0
N1—C2—C3	123.33 (16)	C16—C17—H17	119.0
O2—C2—C3	117.84 (16)	C17—C18—C19	117.52 (17)
C4—C3—C2	116.12 (16)	C17—C18—H18	121.2
C4—C3—H3	121.9	C19—C18—H18	121.2
C2—C3—H3	121.9	N4—C19—O3	118.96 (16)
C3—C4—C5	123.24 (16)	N4—C19—C18	123.26 (17)
C3—C4—H4	118.4	O3—C19—C18	117.77 (17)
C5—C4—H4	118.4	N4—C20—O4	116.70 (14)
C1—C5—C4	114.45 (15)	N4—C20—C16	124.38 (15)
C1—C5—C6	125.27 (16)	O4—C20—C16	118.91 (14)
C4—C5—C6	120.26 (15)	O1—C21—H21A	109.5
N2—C6—C7	120.26 (16)	O1—C21—H21B	109.5
N2—C6—C5	114.61 (15)	H21A—C21—H21B	109.5
C7—C6—C5	125.12 (15)	O1—C21—H21C	109.5
C8—C7—C6	120.37 (16)	H21A—C21—H21C	109.5
C8—C7—H7	119.8	H21B—C21—H21C	109.5
C6—C7—H7	119.8	O2—C22—H22A	109.5
C7—C8—C9	120.13 (16)	O2—C22—H22B	109.5
C7—C8—H8	119.9	H22A—C22—H22B	109.5
C9—C8—H8	119.9	O2—C22—H22C	109.5
C10—C9—C8	115.14 (15)	H22A—C22—H22C	109.5
C10—C9—C12	121.38 (15)	H22B—C22—H22C	109.5
C8—C9—C12	123.48 (15)	O3—C23—H23A	109.5
N2—C10—C9	126.02 (16)	O3—C23—H23B	109.5
N2—C10—H10	117.0	H23A—C23—H23B	109.5
C9—C10—H10	117.0	O3—C23—H23C	109.5
N3—C11—C12	125.36 (16)	H23A—C23—H23C	109.5
N3—C11—H11	117.3	H23B—C23—H23C	109.5
C12—C11—H11	117.3	O4—C24—H24A	109.5
C13—C12—C11	115.14 (15)	O4—C24—H24B	109.5
C13—C12—C9	122.22 (15)	H24A—C24—H24B	109.5
C11—C12—C9	122.63 (15)	O4—C24—H24C	109.5
C14—C13—C12	120.59 (16)	H24A—C24—H24C	109.5
C14—C13—H13	119.7	H24B—C24—H24C	109.5
C2—N1—C1—O1	178.19 (15)	N3—C11—C12—C9	−178.07 (17)
C2—N1—C1—C5	−0.8 (2)	C10—C9—C12—C13	−19.2 (3)
C21—O1—C1—N1	−5.8 (2)	C8—C9—C12—C13	160.80 (17)
C21—O1—C1—C5	173.33 (16)	C10—C9—C12—C11	159.83 (17)
C1—N1—C2—O2	179.34 (15)	C8—C9—C12—C11	−20.2 (3)
C1—N1—C2—C3	−0.4 (3)	C11—C12—C13—C14	−0.6 (3)
C22—O2—C2—N1	−6.0 (2)	C9—C12—C13—C14	178.47 (17)
C22—O2—C2—C3	173.76 (16)	C12—C13—C14—C15	−0.7 (3)
N1—C2—C3—C4	1.0 (3)	C11—N3—C15—C14	−1.3 (3)
O2—C2—C3—C4	−178.75 (15)	C11—N3—C15—C16	176.97 (15)
C2—C3—C4—C5	−0.4 (3)	C13—C14—C15—N3	1.7 (3)
N1—C1—C5—C4	1.3 (2)	C13—C14—C15—C16	−176.46 (17)
O1—C1—C5—C4	−177.71 (15)	N3—C15—C16—C17	−9.1 (2)
N1—C1—C5—C6	179.71 (15)	C14—C15—C16—C17	169.13 (18)
O1—C1—C5—C6	0.7 (2)	N3—C15—C16—C20	172.75 (15)
C3—C4—C5—C1	−0.6 (2)	C14—C15—C16—C20	−9.0 (3)
C3—C4—C5—C6	−179.12 (16)	C20—C16—C17—C18	−0.7 (3)
C10—N2—C6—C7	−0.3 (3)	C15—C16—C17—C18	−179.08 (18)
C10—N2—C6—C5	179.94 (16)	C16—C17—C18—C19	0.3 (3)
C1—C5—C6—N2	−166.43 (16)	C20—N4—C19—O3	179.54 (16)
C4—C5—C6—N2	11.9 (2)	C20—N4—C19—C18	−0.7 (3)
C1—C5—C6—C7	13.8 (3)	C23—O3—C19—N4	−3.8 (3)
C4—C5—C6—C7	−167.89 (17)	C23—O3—C19—C18	176.41 (19)
N2—C6—C7—C8	1.1 (3)	C17—C18—C19—N4	0.4 (3)
C5—C6—C7—C8	−179.12 (16)	C17—C18—C19—O3	−179.80 (19)
C6—C7—C8—C9	−0.8 (3)	C19—N4—C20—O4	−179.38 (15)
C7—C8—C9—C10	−0.3 (2)	C19—N4—C20—C16	0.2 (2)
C7—C8—C9—C12	179.71 (16)	C24—O4—C20—N4	−3.2 (2)
C6—N2—C10—C9	−1.0 (3)	C24—O4—C20—C16	177.18 (15)
C8—C9—C10—N2	1.2 (3)	C17—C16—C20—N4	0.5 (2)
C12—C9—C10—N2	−178.79 (17)	C15—C16—C20—N4	178.68 (15)
C15—N3—C11—C12	0.0 (3)	C17—C16—C20—O4	−179.93 (15)
N3—C11—C12—C13	1.0 (3)	C15—C16—C20—O4	−1.7 (2)

D—H···A	D—H	H···A	D···A	D—H···A
C7—H7···O1	0.94	2.20	2.808 (2)	122
C4—H4···N2	0.94	2.41	2.760 (2)	102
C14—H14···O4	0.94	2.16	2.808 (2)	125
C17—H17···N3	0.94	2.40	2.752 (2)	102
C22—H22C···Cg3i	0.97	2.78	3.579 (2)	140