Hydrogen bonds and π–π stacking interaction in 4′, 7-dimethoxylisoflavone and 4′,7-diacetyl-O-isoflavone
作者:Zun-Ting Zhang、Xiao-Bing Wang、Qiu-Ya Wang、Li-Na Wu
DOI:10.1007/s10870-005-5175-z
日期:2005.11
4′,7-dimethoxylisoflavone, C17H14O4, (I), is linked into a supramolecular structure by a variety of weak but direction-specific intermolecular forces, the molecules are linked into chains through C–H⋅sO hydrogen bonds, these chains are further linked by face-to-face (F-tape) π–π stacking into a one-dimensional bi-chain, another type π–π stacking, edge-to-face (T-tape), assemble the bi-chain into framework together with C–H⋅sO hydrogen bonds. 4′,7-diacetyl-O-isoflavone, C19H15O6, (II), shows some discrepancies with I and the molecules are assembled into framework all by C–H⋅sO hydrogen bonds. The molecules are linked into centrosymmetric dimers built from classic R22 (8) rings by pairs of C–H⋅sO hydrogen bonds, the dimers are linked into (011) sheets by combination of the R22 (8) ring and C–H⋅sO hydrogen bonds, another C–H⋅sO hydrogen bond assemble the sheets into three-dimensional network.
4′,7-二甲氧基异黄酮, C17H14O4, (I), 通过多种弱但方向特定的分子间作用力连接成超分子结构, 分子通过 C–H⋅sO 氢键连接成链, 这些链进一步通过面对面 (F-tape) π–π 堆积形成一维双链, 另一种类型的 π–π 堆积, 边对面 (T-tape), 与 C–H⋅sO 氢键一起将双链组装成框架。4′,7-二乙酰基-O-异黄酮, C19H15O6, (II), 与 I 有一些差异, 分子完全通过 C–H⋅sO 氢键组装成框架。分子通过成对的 C–H⋅sO 氢键形成经典的 R22 (8) 环, 连接成中心对称二聚体, 这些二聚体通过 R22 (8) 环和 C–H⋅sO 氢键的组合连接成 (011) 层, 另一个 C–H⋅sO 氢键将层组装成三维网络。