Selective Formation of Inter- and Intramolecular A-D-Aπ-π Stacking: Solid-State Structures of Bis(pyridiniopropyl)benzenes
作者:Take-aki Koizumi、Kanako Tsutsui、Koji Tanaka
DOI:10.1002/ejoc.200300310
日期:2003.12
The synthesis and molecular structures of bis(pyridiniopropyl)benzene derivatives, [1,4-(4-R-C5H4N+CH2CH2CH2)2C6H4][X−]2 (1, R = H, X = I; 2, R = tBu, X = Br) have been investigated. Compound 1 adopts a linear structure in the solid state and the crystal packing geometry can be defined as isolated triplets formed by the phenylene ring of one molecule and two pyridinium rings of two neighboring molecules
双(吡啶基丙基)苯衍生物[1,4-(4-R-C5H4N+CH2CH2CH2)2C6H4][X−]2的合成和分子结构(1, R = H, X = I; 2, R = tBu , X = Br) 进行了研究。化合物 1 在固态时采用线性结构,晶体堆积几何可以定义为由一个分子的亚苯基环和两个相邻分子的两个吡啶环形成的孤立的三联体。相比之下,化合物2呈S形排列,分子内受体-供体-受体三联体形成在同一分子的中心亚苯基环和两个末端吡啶环之间。1和2的晶体结构的这种明显差异可归因于吡啶鎓单元上的取代基。庞大的叔丁基的空间排斥阻碍了分子间 ADA π-π 堆积。