作者:Christopher E. Marjo、Marcia L. Scudder、Donald C. Craig、Roger Bishop
DOI:10.1039/a700494j
日期:——
Study of the lattice packing in the crystal structures of the diquinoline compounds 1 [C23H18N2, P, a = 6.1953(8), b = 11.427(2), c = 12.686(2) Ã
, α = 108.428(7), β = 92.189(8), γ = 103.437(7)°, Z = 2, R = 0.038] and 2·CHCl3 [C23H16Br2N2·CHCl3, P21/c, a = 9.865(3), b = 15.307(3), c = 17.946(5) Ã
, β = 122.12(1)°, Z = 4, R = 0.031] reveals a previously unrecognised mode of intermolecular attraction which we term the edge-to-edge aryl CâH · · · N dimer. Examination of the Cambridge Structural Database shows that this type of contact is present in a wide range of nitrogen-containing aromatic solids. In all 54 identified cases the two weak intermolecular hydrogen bonds are identical producing a symmetrical dimer and, in all cases but one, the arrangement created is centrosymmetric. Hence this new packing mode represents a predictable new synthon for supramolecular assembly.
对二喹啉化合物1 [C23H18N2, P, a = 6.1953(8), b = 11.427(2), c = 12.686(2) Å, α = 108.428(7), β = 92.189(8), γ = 103.437(7)°, Z = 2, R = 0.038]和2·CHCl3 [C23H16Br2N2·CHCl3, P21/c, a = 9.865(3), b = 15.307(3), c = 17.946(5) Å, β = 122.12(1)°, Z = 4, R = 0.031]的晶体结构中晶格堆积的研究揭示了一种以前未被发现的分子间吸引模式,我们称之为边缘对边缘芳基C-H···N二聚体。对剑桥结构数据库的检验表明,这种类型的接触存在于多种含氮芳香族固体中。在所有54个已识别案例中,两个弱分子间氢键是相同的,形成对称二聚体,除一个案例外,所有案例中形成的排列都是中心对称的。