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经过铝粉加热活化的AlCl_3与SmCl_3在苯中反应,得到了Sm(η~6—C_6H_6)(AlCl_4)_3·C_6H_6单晶.其晶体属于三斜晶系,P1空间群,晶胞参数a=9.456(2)(?),b=9.765(3)(?),c=16.776(4)(?),α=96.00(2)°,β=93.76(2)°,γ=111.66(2)°,V=1422.55(?)~3,Z=2.晶体结构是采用Patterson和Fourier合成法解出的,所有非氢原子的坐标及各向异性热振动参数经块矩阵最小二乘法修正,最后偏离因子R=0.031,R_ω=0.035.分子结构中,中心离子Sm(Ⅲ)与六个Cl原子及一个苯环上的六个C原子成键.Sm-C键平均距离2.92(?),Sm-Cl平均距离2.83(?).与希土相连的六个Cl原子,其中之五构成平面五边形,整个分子呈大致的五角双锥形.
The reaction of AlCl 3 with SmCl 3 in benzene catalyzed by aluminum powder yielded a single crystal of Sm (η ~ 6-C 6 H 6) (AlCl 4) _3 · C_6H 6, which belongs to the triclinic system with P1 space group and unit cell parameters a = 9.456 (2) (?), B = 9.765 (3) (?), C = 16.776 (4) (?),? = 96.00 (2) °,? = 93.76 (2) °, V = 1422.55 (?) ~ 3, Z = 2. The crystal structure is solved by the method of Patterson and Fourier. The coordinate and anisotropic thermal vibration parameters of all non-hydrogen atoms are corrected by the least square method of block matrix. Finally, In the molecular structure, the central ion Sm (III) bonds with six Cl atoms and six C atoms on one benzene ring, and the average distance between Sm-C bonds is 2.92 (?), Sm -Cl average distance 2.83 (?). Six Cl atoms connected with the Greek soil, of which five constitute a planar pentagon, the entire molecule was roughly pentagonal biconical.