Oligomeric Rare-Earth-Metal Halide Clusters. Three Structures Built of (Y<sub>16</sub>Z<sub>4</sub>)Br<sub>36</sub> Units (<i>Z</i> = Ru, Ir)
作者:Sharon J. Steinwand、John D. Corbett
DOI:10.1021/ic960650x
日期:1996.1.1
of the Y(16)Z(4) nuclei and, in part, bridge to metal atoms in other clusters. The principal bonding appears to be Y-Z and Y-Br, with weaker Y-Y (&dmacr; approximately 3.70 Å) and negligible Z-Z interactions. The phase Y(16)Br(20)Ru(4) (P4(2)/nnm, Z = 2; a = 11.662(1) Å, c = 16.992 (2) Å) is isostructural with Y(16)I(20)Ru(4) and with the new Sc(16)Br(20)Z(4) (Z = Fe, Os). Syntheses only in the presence
在密封的Nb管中在850-950摄氏度下进行的适当反应可得到一系列低聚簇相的良好收率,其特征在于单晶X射线衍射手段。基本Y(16)Z(4)单元(大约对称)可以从中心Y(6)Br(12)Z型簇的2 + 2缩合或作为四峰截短的四面体Y(16)以大四面体Z(4)为中心。这些被36个溴原子包围,它们桥接Y(16)Z(4)原子核的边缘或帽面,并部分桥接其他簇中的金属原子。主要的键合似乎是YZ和Y-Br,YY较弱(dmacr约为3.70Å),ZZ相互作用可忽略不计。相Y(16)Br(20)Ru(4)(P4(2)/ nnm,Z = 2; a = 11.662(1)Å,c = 16。992(2)Å)具有Y(16)I(20)Ru(4)和新的Sc(16)Br(20)Z(4)(Z = Fe,Os)的同构结构。仅在Ir和ABr-YBr(3)助熔剂(A = K-Cs)存在的情况下才能产生Y(16)Br(24)Ir(4)(Fddd,Z