Literature DB >> 28217319

Crystal structure of 7,15-bis-(4-tert-butyl-phen-yl)-1,9-di-methyl-hepta-zethrene.

Sho Kamata1, Sota Sato2, Jishan Wu3, Hiroyuki Isobe4.   

Abstract

The title compound, C50H44, 1, was synthesized as a derivative of hepta-zethrene bearing two methyl and two tert-butyl-phenyl substituents, respectively, at the 1,9- and 7,15-positions. The asymmetric unit consists of one half of the mol-ecule, which lies about an inversion centre. Albeit remotely located, the substituents contort the hepta-zethrene plane. The tert-butyl-phenyl substituents stand approximately perpendicular to the core plane, with a dihedral angle of 79.09 (5)° between the phenalene ring system and the substituted benzene ring, and prevent direct inter-molecular contacts of the hepta-zethrene cores.

Entities:  

Keywords:  crystal structure; hepta­zethrene; substituent effect

Year:  2017        PMID: 28217319      PMCID: PMC5290542          DOI: 10.1107/S2056989016020247

Source DB:  PubMed          Journal:  Acta Crystallogr E Crystallogr Commun


Chemical context

Heptazethrene is a polycyclic aromatic hydro­carbon with a characteristic Z-shaped mol­ecular structure. A series of hepta­zethrene derivatives have been synthesized by one of the authors, and a derivative, 2, with methyl and silylethynyl substituents at the 1,9- and 7,15-positions has been reported as the first closed-shell congener (Li et al., 2012 ▸). In the crystal structure of 2, we noticed that the silylethynyl substituents are distorted into a non-linear geometry. Considering that the distorted structure originated from steric inter­actions between the 1,9- and 7,15-positions, we investigated substituent effects on the mol­ecular structure. Replacing the silylethynyl groups with tert-butyl­phenyl groups, we designed the title compound, 1, and synthesized it via a route recently established for other hepta­zethrene derivatives (Hu et al., 2016 ▸).

Structural commentary

The mol­ecular structure of 1 (Fig. 1 ▸) consists of a hepta­zethrene unit at the core, two methyl substituents at the 1,9-positions and two tert-butyl­phenyl substituents at the 7,15-positions. One-half of the mol­ecule is generated by the symmetry operation (1 − x, 1 − y, 1 − z), and carbon atoms at the 1/9-, 7/15- or 8/16-positions, for instance, are symmetrically equivalent (Fig. 2 ▸ a). As is the case with 2, a typical bond-length alternation in the central hexa­gon is observed, indicating a quinoidal character for 1 (Li et al., 2012 ▸). Unlike 2, however, the hepta­zethrene core of 1 is not flat but contorted. The mean plane of the hepta­zethrene core is generated by adopting 28 carbon atoms of the core (OLEX2; Dolomanov et al., 2009 ▸) and the deviation of the atoms from the mean plane is visualized in Fig. 2 ▸ b. The maximum deviation of 0.2969 (10) Å is recorded (by using OLEX2) for the carbon atoms at the 7- and 15-positions. The same analysis was applied to 2 (Fig. 2 ▸ c), and the maximum distance from the mean plane is 0.103 (3) Å for the carbon atoms at the 8- and 16-positions. The contorted structure of 1 is also evidenced by the torsion angle at the 1–16b–16a–16 (see Fig. 1 ▸) positions, is −16.91 (19)°. For 2, the torsion angle at the same position is 5.8 (3)°, which indicates that steric inter­actions between the 1-methyl and 7-phenyl groups may result in the contorted structure.
Figure 1

Chemical structures of hepta­zethrene derivatives. Numbers of positions are displayed for 1.

Figure 2

The mol­ecular structures of hepta­zethrene derivatives. Displacement ellipsoids are drawn at the 50% probability level. (a) 1 with the atom-numbering scheme [symmetry code: (i) 1 − x, 1 − y, 1 − z]. (b) 1 with a mean plane of 28 C atoms, viewed perpendicular to the plane shown in red. (c) 2 with a mean plane of 28 C atoms, viewed perpendicular to the plane shown in red.

Supra­molecular features

As is the case of 2 (Li et al., 2012 ▸), the mol­ecules of 1 form layers with the hepta­zethrene cores assembled in a parallel manner (Fig. 3 ▸). However, due to the bulky phenyl groups at the 7,15-positions, the hepta­zethrene cores do not directly contact each other. C—H⋯π inter­actions are instead observed between the hepta­zethrene core and the phenyl substituent (Table 1 ▸).
Figure 3

Packing diagram of 1, viewed along the c axis.

Table 1

Hydrogen-bond geometry (Å, °)

Cg1 and Cg2 are the centroids of the C1–C3/C3A/C3A1/C8B and C3A1/C3A/C4–C6/C6A rings, respectively.

D—H⋯A D—HH⋯A DA D—H⋯A
C3P—H3PCg1i 0.952.803.6278 (15)147
C3T—H3T2⋯Cg2i 0.982.973.7929 (17)143

Symmetry code: (i) .

Database survey

A search of the Cambridge Structural Database (version 5.37 Update 2; Groom et al., 2016 ▸) for hepta­zethrene derivatives returns one result, compound 2 (Li et al., 2012 ▸). Two newer derivatives, 1,9-bis­(hex­yloxy)-7,15-dimesityl-hepta­zethrene and 1,9-bis­(hex­yloxy)-7,15-bis­(penta­fluoro­phen­yl)-hepta­zethrene, have recently been reported (Hu et al., 2016 ▸). Detailed comparisons with compound 2 are described above. The other two derivatives possessing 7,15-phenyl groups and 1,9-alk­oxy substituents are also contorted. Two crystallographically independent mol­ecules are observed in 1,9-bis­(hex­yloxy)-7,15-dimesityl-hepta­zethrene, and the 1–16b–16a–16 torsion angles are 2.55 (19) and 13.94 (19)°. One mol­ecule is observed in 1,9-bis­(hex­yloxy)-7,15-bis­(penta­fluoro­phen­yl)-hepta­zethrene, and the corresponding torsion angle is 6.44 (18)°.

Synthesis and crystallization

The title compound 1 was synthesized by a method reported in a literature (Hu et al., 2016 ▸) with different starting materials for the introduction of different substituents (Fig. 4 ▸). A mixture of 2,5-di­bromo-terephthalaldehyde 3 (2.30 g, 7.89 mmol), 2-methyl­naphthyl­boronic acid 4 (4.41 g, 23.7 mmol), Pd2(dba)3·CHCl3 (407 mg, 0.393 mmol), SPhos (648 mg, 1.58 mmol) and K2CO3 (5.46 g, 39.4 mmol) was stirred in a deaerated solvent composed of toluene (70.8 ml), ethanol (17.2 ml) and water (19.0 ml) at 363 K for 24 h. The reaction was quenched by addition of saturated aqueous NH4Cl (50 ml). Organic materials were extracted with CHCl3 (30 ml × 4), and the combined organic phase was washed with brine, dried over MgSO4 and concentrated in vacuo. Crude materials were purified by silica gel column chromatography (eluent: 30% CHCl3/hexa­ne) to afford the coupling product 5 in 2.02 g (4.87 mmol, 62% yield) as a yellow powder. The compound 5 (1.64 g, 3.97 mmol) was dissolved in THF (80.0 mL), and to the solution was added 4-tert-butyl­phenyl­magnesium bromide (30.0 ml, 0.66 M in diethyl ether, 19.8 mmol) at 273 K. The mixture was stirred for 2 h, and saturated aqueous NH4Cl (20 ml) was added. Organic materials were extracted with ethyl acetate (50 ml × 3), and the combined organic phase was washed with brine, dried over Na2SO4 and concentrated in vacuo to give a yellow oil containing diol 6. Without purification, the crude material was dissolved in CH2Cl2 (200 ml), and BF3·Et2O (5.10 ml, 39.5 mmol) was added at ambient temperature. After 10 min, methanol (10 ml) was added, and volatile materials were removed in vacuo. The crude material was washed with methanol (50 ml), and a purple solid containing the cyclized compound 7 was obtained. Without purification, the crude material was dissolved in toluene (400 ml), and to the solution was added a solution of 2,3-di­chloro-5,6-di­cyano-para-benzo­quinone (DDQ; 70.0 ml, 79.5 mM in toluene, 5.57 mmol) at ambient temperature. After 1 h, the mixture was poured onto a pad of silica gel (250 g) and eluted with toluene to afford the title compound 1. A small amount of contaminants was noted and was removed by washing the compound with methanol (50 ml) to afford the title compound 1 (1.33 g, 2.06 mmol, 52% in three steps from 5) as a purple solid. Suitable single crystals were grown from slow liquid–liquid diffusion of aceto­nitrile into a toluene solution of 1.
Figure 4

Synthesis of the title compound, 1.

Physical data: m.p. ca 643 K (decomposed); IR (ATR, neat): 567, 587, 764, 803, 825, 837, 1017, 1108, 1269, 1362, 1447, 1461, 2864, 2901, 2951 cm−1; 1H NMR (400 MHz, C6D6) δ 1.32 (s, 18H), 2.36 (s, 6H), 7.03 (t, J = 8.0Hz, 2H), 7.09 (d, J = 8.4 Hz, 2H), 7.25 (d, J = 7.8 Hz, 2H), 7.28 (dt, J = 8.4 Hz, 2.0 Hz, 4H), 7.36 (d, J = 8.0 Hz, 2H), 7.37 (dt, J = 8.4 Hz, 2.0 Hz, 4H), 7.38 (d, J = 8.4 Hz, 2.0 Hz, 4H), 7.72 (s, 2H); 13C NMR (100 MHz, C6D6) δ 26.0 (CH3), 31.5 (CH3), 34.6, 125.6 (CH), 126.1* (CH), 127.1 (CH), 127.4 (CH), 129.2 (CH), 129.7, 130.3, 131.0* (CH), 131.7, 132.6 (CH), 133.2, 133.6, 134.7, 136.0, 136.7, 150.3 (Resonances with * appeared with twofold intensities and should contain two overlapping resonances.); HR–MS (DART–TOF, positive) calculated for C50H44 [M+H]+ 645.3521, found 645.3545.

Refinement

Crystal data, data collection and structure refinement details are summarized in Table 2 ▸. H atoms were positioned geometrically and refined as riding, allowing for rotation of the methyl group, with U iso(H) = 1.5U eq(C) for methyl H atoms and 1.2U eq(C) for aromatic H atoms.
Table 2

Experimental details

Crystal data
Chemical formulaC50H44
M r 644.90
Crystal system, space groupTriclinic, P
Temperature (K)93
a, b, c (Å)8.7644 (2), 9.2002 (3), 13.1212 (3)
α, β, γ (°)105.874 (2), 95.080 (2), 115.249 (3)
V3)894.47 (5)
Z 1
Radiation typeCu Kα
μ (mm−1)0.51
Crystal size (mm)0.15 × 0.08 × 0.03
 
Data collection
DiffractometerRigaku XtaLAB P200
Absorption correctionMulti-scan (CrysAlis PRO; Rigaku Oxford Diffraction, 2015)
T min, T max 0.878, 0.985
No. of measured, independent and observed [F 2 > 2.0σ(F 2)] reflections22866, 3256, 2930
R int 0.026
(sin θ/λ)max−1)0.602
 
Refinement
R[F 2 > 2σ(F 2)], wR(F 2), S 0.044, 0.131, 1.08
No. of reflections3256
No. of parameters230
H-atom treatmentH-atom parameters constrained
Δρmax, Δρmin (e Å−3)0.37, −0.23

Computer programs: CrysAlis PRO (Rigaku Oxford Diffraction, 2015 ▸), SHELXT (Sheldrick, 2015a ▸), SHELXL2016 (Sheldrick, 2015b ▸), CrystalStructure (Rigaku, 2016 ▸), Mercury (Macrae et al., 2008 ▸), OLEX2 (Dolomanov et al., 2009 ▸) and publCIF (Westrip, 2010 ▸).

Crystal structure: contains datablock(s) global, I. DOI: 10.1107/S2056989016020247/is5468sup1.cif Structure factors: contains datablock(s) I. DOI: 10.1107/S2056989016020247/is5468Isup2.hkl Click here for additional data file. Supporting information file. DOI: 10.1107/S2056989016020247/is5468Isup3.mol CCDC reference: 1523781 Additional supporting information: crystallographic information; 3D view; checkCIF report
C50H44Z = 1
Mr = 644.90F(000) = 344.00
Triclinic, P1Dx = 1.197 Mg m3
a = 8.7644 (2) ÅCu Kα radiation, λ = 1.54187 Å
b = 9.2002 (3) ÅCell parameters from 15939 reflections
c = 13.1212 (3) Åθ = 3.6–68.2°
α = 105.874 (2)°µ = 0.51 mm1
β = 95.080 (2)°T = 93 K
γ = 115.249 (3)°Block, purple
V = 894.47 (5) Å30.15 × 0.08 × 0.03 mm
Rigaku XtaLAB P200 diffractometer2930 reflections with F2 > 2.0σ(F2)
Detector resolution: 5.811 pixels mm-1Rint = 0.026
ω scansθmax = 68.3°, θmin = 3.6°
Absorption correction: multi-scan (CrysAlis PRO; Rigaku Oxford Diffraction, 2015)h = −10→10
Tmin = 0.878, Tmax = 0.985k = −9→10
22866 measured reflectionsl = −15→15
3256 independent reflections
Refinement on F2Secondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.044Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.131H-atom parameters constrained
S = 1.08w = 1/[σ2(Fo2) + (0.0807P)2 + 0.1872P] where P = (Fo2 + 2Fc2)/3
3256 reflections(Δ/σ)max < 0.001
230 parametersΔρmax = 0.37 e Å3
0 restraintsΔρmin = −0.23 e Å3
Primary atom site location: structure-invariant direct methods
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.
Refinement. Refinement was performed using all reflections. The weighted R-factor (wR) and goodness of fit (S) are based on F2. R-factor (gt) are based on F. The threshold expression of F2 > 2.0 sigma(F2) is used only for calculating R-factor (gt).
xyzUiso*/Ueq
C10.77143 (15)0.27792 (16)0.37967 (10)0.0282 (3)
C20.82438 (16)0.19027 (16)0.29671 (11)0.0304 (3)
H20.9010440.1492160.3166960.036*
C30.77086 (16)0.16138 (16)0.18882 (11)0.0294 (3)
H30.8024440.0935610.1352160.035*
C3A0.66842 (15)0.23267 (15)0.15725 (10)0.0270 (3)
C3A10.61706 (14)0.32728 (14)0.23942 (10)0.0247 (3)
C40.61937 (16)0.21352 (16)0.04656 (10)0.0299 (3)
H40.6513580.147501−0.0079730.036*
C50.52627 (16)0.28945 (16)0.01768 (10)0.0308 (3)
H50.4927980.274895−0.0567700.037*
C60.48038 (16)0.38832 (16)0.09751 (10)0.0284 (3)
H60.4185150.4427530.0764000.034*
C6A0.52289 (15)0.40922 (15)0.20719 (10)0.0254 (3)
C70.47383 (15)0.51085 (15)0.28851 (10)0.0253 (3)
C7A0.49880 (15)0.51364 (15)0.39461 (10)0.0255 (3)
C80.42937 (15)0.59605 (15)0.47208 (10)0.0261 (3)
H80.3868960.6662320.4523000.031*
C8A0.57990 (15)0.41936 (15)0.42770 (10)0.0249 (3)
C8B0.65887 (15)0.34037 (15)0.35078 (10)0.0255 (3)
C1M0.84692 (17)0.29973 (19)0.49464 (11)0.0359 (3)
H1M10.9534560.2887600.4964030.054*
H1M20.7624620.2113590.5176390.054*
H1M30.8736530.4131860.5442120.054*
C1P0.37768 (15)0.59823 (15)0.25632 (9)0.0257 (3)
C2P0.45677 (15)0.77354 (16)0.27639 (10)0.0275 (3)
H2P0.5784500.8400950.3059580.033*
C3P0.36053 (16)0.85288 (16)0.25386 (10)0.0278 (3)
H3P0.4180030.9727950.2680450.033*
C4P0.18176 (15)0.76070 (15)0.21096 (10)0.0273 (3)
C5P0.10460 (16)0.58447 (16)0.18943 (11)0.0329 (3)
H5P−0.0168150.5173200.1589860.039*
C6P0.19987 (16)0.50500 (16)0.21115 (11)0.0317 (3)
H6P0.1429910.3845750.1949580.038*
C1T0.06794 (16)0.84316 (17)0.19069 (11)0.0333 (3)
C2T−0.05461 (19)0.8203 (2)0.26853 (15)0.0468 (4)
H2T1−0.1183340.6988590.2598590.070*
H2T2−0.1370010.8610740.2514740.070*
H2T30.0133420.8864630.3439030.070*
C3T0.17399 (17)1.03289 (17)0.20891 (13)0.0401 (3)
H3T10.0960471.0783140.1916710.060*
H3T20.2557211.0481670.1615180.060*
H3T30.2384941.0943590.2852790.060*
C4T−0.04149 (19)0.7524 (2)0.07259 (13)0.0465 (4)
H4T1−0.1185810.6318920.0611580.070*
H4T20.0354860.7596030.0222570.070*
H4T3−0.1111040.8078990.0590850.070*
U11U22U33U12U13U23
C10.0275 (6)0.0267 (6)0.0350 (6)0.0137 (5)0.0094 (5)0.0150 (5)
C20.0297 (6)0.0289 (6)0.0402 (7)0.0168 (5)0.0122 (5)0.0169 (5)
C30.0297 (6)0.0253 (6)0.0382 (7)0.0147 (5)0.0143 (5)0.0130 (5)
C3A0.0256 (6)0.0229 (6)0.0331 (6)0.0092 (5)0.0105 (5)0.0129 (5)
C3A10.0226 (5)0.0204 (6)0.0323 (6)0.0087 (5)0.0088 (5)0.0124 (5)
C40.0327 (6)0.0255 (6)0.0324 (6)0.0129 (5)0.0126 (5)0.0112 (5)
C50.0357 (7)0.0287 (7)0.0286 (6)0.0132 (5)0.0095 (5)0.0131 (5)
C60.0306 (6)0.0263 (6)0.0319 (6)0.0130 (5)0.0088 (5)0.0153 (5)
C6A0.0239 (6)0.0221 (6)0.0312 (6)0.0088 (5)0.0082 (5)0.0132 (5)
C70.0248 (6)0.0223 (6)0.0309 (6)0.0106 (5)0.0074 (5)0.0128 (5)
C7A0.0256 (6)0.0229 (6)0.0307 (6)0.0114 (5)0.0077 (5)0.0131 (5)
C80.0272 (6)0.0247 (6)0.0320 (6)0.0145 (5)0.0078 (5)0.0137 (5)
C8A0.0247 (6)0.0224 (6)0.0290 (6)0.0112 (5)0.0058 (4)0.0110 (5)
C8B0.0239 (6)0.0218 (6)0.0315 (6)0.0093 (5)0.0078 (5)0.0124 (5)
C1M0.0378 (7)0.0472 (8)0.0390 (7)0.0293 (6)0.0127 (6)0.0218 (6)
C1P0.0294 (6)0.0279 (6)0.0255 (6)0.0152 (5)0.0097 (5)0.0137 (5)
C2P0.0245 (6)0.0276 (6)0.0327 (6)0.0117 (5)0.0083 (5)0.0144 (5)
C3P0.0283 (6)0.0237 (6)0.0351 (6)0.0123 (5)0.0098 (5)0.0144 (5)
C4P0.0277 (6)0.0269 (6)0.0315 (6)0.0142 (5)0.0091 (5)0.0135 (5)
C5P0.0256 (6)0.0279 (7)0.0434 (7)0.0104 (5)0.0041 (5)0.0146 (6)
C6P0.0311 (6)0.0229 (6)0.0409 (7)0.0114 (5)0.0055 (5)0.0139 (5)
C1T0.0261 (6)0.0300 (7)0.0477 (7)0.0144 (5)0.0088 (5)0.0171 (6)
C2T0.0397 (8)0.0401 (8)0.0768 (11)0.0247 (7)0.0285 (7)0.0292 (8)
C3T0.0315 (7)0.0308 (7)0.0654 (9)0.0172 (6)0.0110 (6)0.0232 (7)
C4T0.0373 (7)0.0427 (8)0.0607 (9)0.0206 (7)−0.0017 (7)0.0205 (7)
C1—C21.4068 (18)C1M—H1M20.9800
C1—C8B1.4084 (17)C1M—H1M30.9800
C1—C1M1.5159 (17)C1P—C2P1.3902 (17)
C2—C31.3655 (18)C1P—C6P1.3905 (17)
C2—H20.9500C2P—C3P1.3896 (17)
C3—C3A1.4117 (17)C2P—H2P0.9500
C3—H30.9500C3P—C4P1.3928 (17)
C3A—C41.4178 (17)C3P—H3P0.9500
C3A—C3A11.4247 (17)C4P—C5P1.3950 (17)
C3A1—C8B1.4335 (17)C4P—C1T1.5331 (17)
C3A1—C6A1.4394 (17)C5P—C6P1.3804 (17)
C4—C51.3689 (18)C5P—H5P0.9500
C4—H40.9500C6P—H6P0.9500
C5—C61.3970 (18)C1T—C3T1.5220 (18)
C5—H50.9500C1T—C2T1.5361 (19)
C6—C6A1.3926 (17)C1T—C4T1.538 (2)
C6—H60.9500C2T—H2T10.9800
C6A—C71.4409 (17)C2T—H2T20.9800
C7—C7A1.3813 (17)C2T—H2T30.9800
C7—C1P1.4952 (16)C3T—H3T10.9800
C7A—C81.4353 (17)C3T—H3T20.9800
C7A—C8A1.4572 (16)C3T—H3T30.9800
C8—C8Ai1.3664 (17)C4T—H4T10.9800
C8—H80.9500C4T—H4T20.9800
C8A—C8B1.4756 (17)C4T—H4T30.9800
C1M—H1M10.9800
C2—C1—C8B118.76 (11)C1—C1M—H1M3109.5
C2—C1—C1M115.40 (11)H1M1—C1M—H1M3109.5
C8B—C1—C1M125.82 (11)H1M2—C1M—H1M3109.5
C3—C2—C1123.15 (12)C2P—C1P—C6P117.68 (11)
C3—C2—H2118.4C2P—C1P—C7122.52 (11)
C1—C2—H2118.4C6P—C1P—C7119.66 (11)
C2—C3—C3A119.76 (12)C3P—C2P—C1P121.00 (11)
C2—C3—H3120.1C3P—C2P—H2P119.5
C3A—C3—H3120.1C1P—C2P—H2P119.5
C3—C3A—C4121.12 (11)C2P—C3P—C4P121.54 (11)
C3—C3A—C3A1118.58 (11)C2P—C3P—H3P119.2
C4—C3A—C3A1120.30 (11)C4P—C3P—H3P119.2
C3A—C3A1—C8B120.68 (11)C3P—C4P—C5P116.84 (11)
C3A—C3A1—C6A118.01 (11)C3P—C4P—C1T123.67 (11)
C8B—C3A1—C6A121.30 (11)C5P—C4P—C1T119.45 (11)
C5—C4—C3A120.49 (11)C6P—C5P—C4P121.80 (11)
C5—C4—H4119.8C6P—C5P—H5P119.1
C3A—C4—H4119.8C4P—C5P—H5P119.1
C4—C5—C6120.12 (11)C5P—C6P—C1P121.12 (12)
C4—C5—H5119.9C5P—C6P—H6P119.4
C6—C5—H5119.9C1P—C6P—H6P119.4
C6A—C6—C5121.78 (12)C3T—C1T—C4P112.58 (10)
C6A—C6—H6119.1C3T—C1T—C2T109.31 (12)
C5—C6—H6119.1C4P—C1T—C2T108.22 (11)
C6—C6A—C3A1119.22 (11)C3T—C1T—C4T108.22 (11)
C6—C6A—C7121.14 (11)C4P—C1T—C4T109.63 (11)
C3A1—C6A—C7119.64 (11)C2T—C1T—C4T108.82 (12)
C7A—C7—C6A120.21 (11)C1T—C2T—H2T1109.5
C7A—C7—C1P119.24 (11)C1T—C2T—H2T2109.5
C6A—C7—C1P120.20 (10)H2T1—C2T—H2T2109.5
C7—C7A—C8120.18 (11)C1T—C2T—H2T3109.5
C7—C7A—C8A121.18 (11)H2T1—C2T—H2T3109.5
C8—C7A—C8A118.35 (11)H2T2—C2T—H2T3109.5
C8Ai—C8—C7A124.58 (11)C1T—C3T—H3T1109.5
C8Ai—C8—H8117.7C1T—C3T—H3T2109.5
C7A—C8—H8117.7H3T1—C3T—H3T2109.5
C8i—C8A—C7A116.82 (11)C1T—C3T—H3T3109.5
C8i—C8A—C8B124.06 (11)H3T1—C3T—H3T3109.5
C7A—C8A—C8B119.05 (11)H3T2—C3T—H3T3109.5
C1—C8B—C3A1118.48 (11)C1T—C4T—H4T1109.5
C1—C8B—C8A124.42 (11)C1T—C4T—H4T2109.5
C3A1—C8B—C8A117.10 (11)H4T1—C4T—H4T2109.5
C1—C1M—H1M1109.5C1T—C4T—H4T3109.5
C1—C1M—H1M2109.5H4T1—C4T—H4T3109.5
H1M1—C1M—H1M2109.5H4T2—C4T—H4T3109.5
C8B—C1—C2—C3−0.49 (19)C2—C1—C8B—C3A1−6.23 (17)
C1M—C1—C2—C3−179.09 (12)C1M—C1—C8B—C3A1172.20 (11)
C1—C2—C3—C3A5.13 (19)C2—C1—C8B—C8A173.80 (11)
C2—C3—C3A—C4176.25 (11)C1M—C1—C8B—C8A−7.76 (19)
C2—C3—C3A—C3A1−2.76 (17)C3A—C3A1—C8B—C18.50 (17)
C3—C3A—C3A1—C8B−4.01 (17)C6A—C3A1—C8B—C1−171.30 (10)
C4—C3A—C3A1—C8B176.97 (10)C3A—C3A1—C8B—C8A−171.53 (10)
C3—C3A—C3A1—C6A175.79 (10)C6A—C3A1—C8B—C8A8.67 (16)
C4—C3A—C3A1—C6A−3.22 (17)C8i—C8A—C8B—C1−16.91 (19)
C3—C3A—C4—C5−177.21 (11)C7A—C8A—C8B—C1166.07 (11)
C3A1—C3A—C4—C51.78 (18)C8i—C8A—C8B—C3A1163.12 (11)
C3A—C4—C5—C60.71 (18)C7A—C8A—C8B—C3A1−13.90 (16)
C4—C5—C6—C6A−1.71 (19)C7A—C7—C1P—C2P81.89 (15)
C5—C6—C6A—C3A10.18 (18)C6A—C7—C1P—C2P−104.89 (14)
C5—C6—C6A—C7−179.66 (11)C7A—C7—C1P—C6P−93.64 (14)
C3A—C3A1—C6A—C62.25 (16)C6A—C7—C1P—C6P79.58 (14)
C8B—C3A1—C6A—C6−177.94 (10)C6P—C1P—C2P—C3P1.16 (17)
C3A—C3A1—C6A—C7−177.91 (10)C7—C1P—C2P—C3P−174.46 (10)
C8B—C3A1—C6A—C71.89 (17)C1P—C2P—C3P—C4P0.31 (18)
C6—C6A—C7—C7A172.31 (11)C2P—C3P—C4P—C5P−1.40 (18)
C3A1—C6A—C7—C7A−7.52 (17)C2P—C3P—C4P—C1T176.39 (11)
C6—C6A—C7—C1P−0.83 (17)C3P—C4P—C5P—C6P1.05 (19)
C3A1—C6A—C7—C1P179.33 (10)C1T—C4P—C5P—C6P−176.83 (12)
C6A—C7—C7A—C8−171.72 (10)C4P—C5P—C6P—C1P0.4 (2)
C1P—C7—C7A—C81.50 (17)C2P—C1P—C6P—C5P−1.51 (18)
C6A—C7—C7A—C8A2.04 (17)C7—C1P—C6P—C5P174.24 (11)
C1P—C7—C7A—C8A175.25 (10)C3P—C4P—C1T—C3T7.25 (18)
C7—C7A—C8—C8Ai168.00 (12)C5P—C4P—C1T—C3T−175.02 (12)
C8A—C7A—C8—C8Ai−5.93 (19)C3P—C4P—C1T—C2T−113.67 (14)
C7—C7A—C8A—C8i−168.40 (12)C5P—C4P—C1T—C2T64.06 (15)
C8—C7A—C8A—C8i5.47 (18)C3P—C4P—C1T—C4T127.77 (13)
C7—C7A—C8A—C8B8.83 (17)C5P—C4P—C1T—C4T−54.50 (15)
C8—C7A—C8A—C8B−177.30 (10)
D—H···AD—HH···AD···AD—H···A
C3P—H3P···Cg1ii0.952.803.6278 (15)147
C3T—H3T2···Cg2ii0.982.973.7929 (17)143
  5 in total

1.  Kinetically blocked stable heptazethrene and octazethrene: closed-shell or open-shell in the ground state?

Authors:  Yuan Li; Wee-Kuan Heng; Byung Sun Lee; Naoki Aratani; José L Zafra; Nina Bao; Richmond Lee; Young Mo Sung; Zhe Sun; Kuo-Wei Huang; Richard D Webster; Juan T López Navarrete; Dongho Kim; Atsuhiro Osuka; Juan Casado; Jun Ding; Jishan Wu
Journal:  J Am Chem Soc       Date:  2012-08-31       Impact factor: 15.419

2.  Toward Tetraradicaloid: The Effect of Fusion Mode on Radical Character and Chemical Reactivity.

Authors:  Pan Hu; Sangsu Lee; Tun Seng Herng; Naoki Aratani; Théo P Gonçalves; Qingbiao Qi; Xueliang Shi; Hiroko Yamada; Kuo-Wei Huang; Jun Ding; Dongho Kim; Jishan Wu
Journal:  J Am Chem Soc       Date:  2016-01-12       Impact factor: 15.419

3.  SHELXT - integrated space-group and crystal-structure determination.

Authors:  George M Sheldrick
Journal:  Acta Crystallogr A Found Adv       Date:  2015-01-01       Impact factor: 2.290

4.  Crystal structure refinement with SHELXL.

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

5.  The Cambridge Structural Database.

Authors:  Colin R Groom; Ian J Bruno; Matthew P Lightfoot; Suzanna C Ward
Journal:  Acta Crystallogr B Struct Sci Cryst Eng Mater       Date:  2016-04-01
  5 in total

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