Pc), were analyzed by single-crystal X-ray diffraction analysis. Subtle differences in the weak intermolecular interactions between the three polymorphic crystal packing arrangements were thoroughly investigated by Hirshfeld surface analysis along with two-dimensional fingerprint plots. The highest Z′ polymorph (1-m) has the lowest packing density but exhibits the shortest intermolecular H···H and C–H···π
研究分子晶体中弱的分子间相互作用是更好地理解晶体多态性和结构形成原理的关键。合成二苄基二苯基
硅烷( 1 )作为烃图案化分子模型化合物。三种多晶型晶体结构,一种Z′ = 1 ( 1-t,三斜晶系,P 1̅ ),一种Z′ = 2 ( 1-o,斜方晶系,Pna 2 1 ),另一种Z′ = 4 ( 1- m , 单斜晶系, Pc),通过单晶X射线衍射分析进行分析。通过赫什
菲尔德表面分析和二维指纹图彻底研究了三种多晶型晶体堆积排列之间弱分子间相互作用的细微差别。Z′最高的多晶型物(1-m)具有最低的堆积密度,但表现出最短的分子间H·H和C–H·π接触。通过密度泛函理论(DFT)计算,比较不同的泛函,研究了构象差异以及色散相互作用对三种多晶型晶体结构稳定性的贡献。Z ' > 1 多晶型物经历相转变为三斜晶型1-t (Z′ = 1) 在室温下。