首页> 外文期刊>Journal of chemical crystallography >Solid-state intermolecular contacts involving the nitrile group in p-cyano-N-(p-cyanobenzylidene)aniline and 4,4′-(azinodimethylidyne)bis- benzonitrile
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Solid-state intermolecular contacts involving the nitrile group in p-cyano-N-(p-cyanobenzylidene)aniline and 4,4′-(azinodimethylidyne)bis- benzonitrile

机译:固态分子间接触涉及对氰基-N-(对氰基亚苄基)苯胺和4,4'-(叠氮二甲基二炔)双苯甲腈中的腈基

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摘要

As part of an investigation of the solid-state intermolecular contacts in which the nitrile group participates, the crystal structures of p-cyano-N-(p-cyanobenzylideneaniline), C_(15)H_9N_3 (CN/CN) and 4,4′-(azinodimethylidyne) bis-benzonitrile, C _(16)H_(10)N_4 (CN//CN) have been determined at -100° C. Cell parameters for CN/CN: a = 4.7270(9) ?, b = 10.443(2) ?, c = 11.943(2) ?; α = 90°, β = 98.70(3)°, γ = 90°; monoclinic, space group P21/c. Cell parameters for CN//CN: a = 3.8008(8) ?, b= 7.9627(16) ?, c = 11.181(2) ?; α = 70.23(3)°, β = 84.66(3)°, γ = 81.93(3)° triclinic, space group P1. Both molecules occupy crystallographic inversion centers, which requires that (CN/CN) be disordered. Both molecules assume nearly planar conformations in the solid state. Neither (CN/CN) nor (CN//CN) is isostructural with its halogen-nitrile substituted analogues, although (CN/CN) is found to be isostructural with the corresponding stilbene. Both (CN/CN) and (CN//CN) engage in centrosymmetric H-bonding interactions that define an R2 2 (10) motif. This motif is also observed in many related structures, although noteworthy exceptions can be found.
机译:作为研究腈基参与的固态分子间接触的一部分,对氰基-N-(对氰基苄基苯胺),C_(15)H_9N_3(CN / CN)和4,4'的晶体结构-(叠氮二甲基二炔)双苄腈C_(16)H_(10)N_4(CN // CN)已在-100°C下测定.CN / CN的电池参数:a = 4.7270(9)α,b = 10.443(2)?,c = 11.943(2)?; α= 90°,β= 98.70(3)°,γ= 90°;单斜,空间群P21 / c。 CN // CN的单元参数:a = 3.8008(8)δ,b = 7.9627(16)δ,c = 11.181(2)δ; c = 11.181(2)δ。 α= 70.23(3)°,β= 84.66(3)°,γ= 81.93(3)°三斜体,空间群P1。这两个分子都占据了晶体学的反转中心,这要求(CN / CN)处于无序状态。这两个分子在固态时都几乎呈平面构象。 (CN / CN)和(CN // CN)都没有被其卤素腈取代的类似物同构,尽管发现(CN / CN)与相应的二苯乙烯是同构的。 (CN / CN)和(CN // CN)都参与定义R2 2(10)基序的中心对称H键相互作用。尽管可以发现值得注意的例外情况,但在许多相关结构中也观察到了该基序。

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