三种Hofmann-H_2O类配位聚合物的晶体结构

Crystal Structures of Three Kinds of Hofmann-H_2O-type Coordination Polymers

分别用2,3-二甲基吡嗪,2,5-二甲基吡嗪,四甲基吡嗪做配体,以[Pd(CN)4]2-为构筑基元,与Fe(ClO4)2通过溶液缓慢扩散法制备了三种化合物的单晶.通过分析这三种化合物的晶体结构,发现由于吡嗪上取代基的空间位阻效应,使这些吡嗪衍生物的配位能力比水分子弱,因而形成了水为配体、吡嗪衍生物为客体分子,具有通式为Fe(H2O)2Pd(CN)4.G的二维Hofmann-H2O类配位聚合物.

Single crystals of three kinds of compounds have been obtained by the slow diffusion of solutions of iron（II） perchlorate,[Pd（CN）4]2 and pyrazine derivatives such as 2,3-dimethylpyrazine,2,5dimethylpyrazine,tetramethylpyrazine.Based on their crystal structures,we found that 2D Hofmann-H2Otype coordination polymers with the formula of Fe（H2O）2Pd（CN）4.G were formed by H2O,in which pyrazine derivatives act as guest molecules due to the steric hindrance of substituent groups of pyrazine.