average Th—Cp distance of 260.6 pm is in good agreement with the predicted distance of 258.8 pm, and is larger than the corresponding distance of the uranium compound (253.8 pm). The temperature dependence of the dipole moment of the title compound, of thorium tetramethylcyclopentadienide (Cp′,Th), and of the homologous uranium compound in benzene solution is discussed with respect to their molecular structure
通过单晶X射线衍射研究了Th(
C5H5)4的晶体和分子结构。该化合物结晶为四方晶系,a = 868.3(1), c = 1064.4(3) pm,每个晶胞有两个分子。平均Th-Cp距离为260.6 pm,与预测距离258.8 pm吻合良好,大于
铀化合物的对应距离(253.8 pm)。讨论了标题化合物、四
甲基环戊二烯化
钍 (Cp',Th) 和同系
铀化合物在苯溶液中的偶极矩的温度依赖性,涉及它们的分子结构。