An Ideal One-Dimensional Antiferromagnetic Spin System Observed in Hydrogen-Bonded Naphth[2,3-<i>d</i>]imidazol-2-yl Nitronyl Nitroxide Crystal: The Role of the Hydrogen Bond
作者:Hideaki Nagashima、Hidenari Inoue、Naoki Yoshioka
DOI:10.1021/jp035849r
日期:2004.5.1
pathways have been assumed: (i) through-space interaction between the O atoms of the nitroxide and (ii) through the NH...ON intermolecular hydrogen bond. We have concluded that pathway (i) is predominant, by considering the identical magnetic data between the NH nondeuterated and deuterated samples. The hydrogen bond mainly has a role in crystal scaffolding.
一种新型的稳定有机基团,2-(萘[2,3-d]咪唑-2-基)-4,4,5,5-四甲基-4,5-二氢-1H-咪唑基-1-氧基yl-3 -氧化物(4)已被设计,合成和结构表征,以研究扩环对2-(苯并咪唑-2-基)-4,4,5,5-四甲基-4,5-二氢-1H的影响-咪唑基-1-氧基-3-氧化物e(2)。4形成分子内和分子间的四中心氢键,并且氢键沿c轴重复以形成一维链结构。该氢键基序与2的氢键基序形成对比,后者形成三个中心的分子内和分子间氢键。4的磁化率测量表明,自旋之间反铁磁相互作用占主导,并且Bonner-Fisher模型的J = -14 cm-1再现了磁行为。因为每个氢键连接的链都很好地隔离,所以人们认为沿着链的方向存在磁相互作用路径。已经假定了两个相互作用途径:(i)氮氧化物的O原子之间的空间相互作用和(ii)通过NH ... ON分子间氢键。我们已经得出结论,通过考虑NH未氘代和氘代样品