units are almost perpendicular. Intramolecular C−H···π interactions are revealed by solution 1H NMR spectroscopy and supported by the AM1 molecular orbital calculations. Intermolecular (aryl, alkyl)C−H···π interactions leading to supramolecular associations are shown by the crystal structures of 3b, 4b, 4c, 5c, and 6a. In 4b and 5c rather unusual CH···HC distances resembling the “dihydrogen” bonds are noticed
新中,通过X射线衍射中(9,9'-二取代二
芴基)(二甲基)基团的衍
生物14族元素发现平行
芴单元还前所未有的分子结构我2 E(CR'R 2)(CR”“R 2)(E =的Si,R '= Me中,R' '=森达3,图6a ; E =葛,R'= Me中,R ' '=森达3,6B ;和E = Sn的,R'= R''=森3,图5c ; CR 2 =
芴单元)。这与单取代的Me 2 Ge(CHR 2)(CR 2 -SiMe 3)(3b)和双取代的Me 2的结构形成鲜明对比。2个E(CMeR 2)2(E = Ge,4b ; E = Sn,4c)衍
生物,其中两个
芴单元几乎垂直。溶液1 H NMR光谱揭示了分子内CH-··π相互作用,并得到
AM1分子轨道计算的支持。3b,4b,4c,5c和6a的晶体结构显示了导致超分子缔合的分子间(芳基,烷基)CH···π相互作用。在4b和5c中注意到类似于“二氢”键的非常不寻常的CH···HC距离。对Me