1-Dimethylamino-2,7-dimethoxy-8-methylamino-3,5-dinitronaphthalene and 1,2,4-tribromo-6-dimethylamino-5-methylaminoacenaphthylene: first examples of N—H...N hydrogen bond contraction/expansion in neutral 1,8-diaminonaphthalenes
作者:O. N. Kazheva、G. V. Shilov、O. A. Dyachenko、M. A. Mekh、V. I. Sorokin、V. A. Ozeryanskii、A. F. Pozharskii
DOI:10.1007/s11172-006-0145-y
日期:2005.11
aromatic ring were studied by X-ray diffraction. Both systems are stabilized by an intramolecular hydrogen bond. The characteristics of the latter are determined by the influence of either the ortho substituents or the peri-annelated five-membered ring. In the former case, the intramolecular hydrogen bond is substantially shortened (N...N, 2.628(5) Å) due to the “buttressing effect” of the o-OMe groups, whereas
摘要1-二甲氨基-2,7-二甲氧基-8-甲氨基-3,5-二硝基萘和1,2,4-三溴-6-二甲氨基-5-甲氨基苊,含有N,N,N'-trimethyl-1,通过X射线衍射研究了具有取代芳环的8-二氨基萘片段。两个系统都通过分子内氢键稳定。后者的特性取决于邻位取代基或周边五元环的影响。在前一种情况下,由于 o-OMe 基团的“支撑效应”,分子内氢键显着缩短(N...N,2.628(5) Å),而周围二溴亚乙基桥和 Br 取代基在在后一种情况下,位置 4 导致分子内氢键的显着延长(N...N,2.75(2) 和 2.76(1) Å)。