Cooperative effect of multiple hydrogen bonding involving the nitro group: solid state dimeric self-assembly of o-, m- and p-hydroxyphenyl-2,4-dinitrophenylhydrazones
作者:Beata Szczęsna、Zofia Urbańczyk-Lipkowska
DOI:10.1039/b105498h
日期:2002.2.11
involvement of the o-NO2 group oxygen in a new type of intramolecular, resonance-assisted hydrogen-bonded system (RAHB), the phenyl ring has a 2,5-diene geometry. The packing patterns observed in crystals of compounds 1–4 are explained as a result of competition between in-plane hydrogen bonding and inter-planar interactions dominated by π–π stacking and dipole–dipole overlap. FT-IR data confirm aggregation
的固态研究ø - ,米- ,和p -羟基苯基-2,4- dinitrophenylhydrazones:1,2,3和4 (3 ·0.5 MeCN中)揭示二聚体自组装分子。两个NH⋯O 2 N和最多六个CH⋯O 2 N分子间氢键的模式会在两个二聚体分子之间产生内聚力。众多弱相互作用的推挽效应会在o -NO 2的带负电的O原子之间产生非键接触组的范围为2.683(2)–2.894(3)Å,远低于范德华半径之和。晶体中OH基团和MeCN分子的存在都不会很大程度地干扰二聚体的形成。为化合物1收集的低温X射线数据提供了证据,表明由于o -NO 2基团氧参与了新型分子内共振辅助氢键系统(RAHB),苯环具有2, 5-二烯的几何形状。在化合物的晶体中观察到的包装模式1 - 4解释是由于平面内氢键和以π-π堆积和偶极-偶极重叠为主的平面间相互作用之间的竞争所致。FT-IR数据证实了溶液中的聚集。讨论了在剑