Synthesis and structural characterization of closo- and exo-nido-lanthanacarboranes

被引：45

作者：

Xie, ZW

Liu, ZX

Chin, KY

Xue, F

Mak, TCW

机构：

来源：

ORGANOMETALLICS | 1997年 / 16卷 / 11期

关键词：

D O I：

10.1021/om970005d

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Treatment of anhydrous LaCl3 with 1 equiv of Na-2[7,8-R-2-nido-7,8-R2C2B9H9] in THF afforded sandwich complexes closo-{(THF)(2)Na}{(R2C2B9H9)(2)La(THF)(2)} (R = H (1), R = C6H5CH2 (2)) in good yield. Reaction of SmI2 with an equimolar amount of Na-2[7,8-nido-7,8-(C6H5CH2)(2)C2B9H9] in THF, followed by the addition of 1,2-dimethoxyethane (DME), generated the dimeric exo-nido-[((C6H5CH2)(2)C2B9H9)Sm(DME)(2)](2) DME (3) in 70% yield. All complexes were characterized by H-1, C-13, and B-11 NMR and IR spectroscopy as well as complexometric metal analyses. The molecular structures of complexes 1 and 3 were further confirmed by-X-ray analyses. The coordination geometry of complex 1 is best described as distorted tetrahedral with two eta(5)-bonded C2B9H11 ligands and two coordinated THF molecules. In the centrosymmetric dimer 3, each of the two dibenzyldicarbollide ligands serves as a bridging ligand for two Sm atoms while bonding to one via upper belt B-H bonds (containing two carbon atoms) and the other through lower belt B-H bonds.

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页码：2460 / 2464

页数：5

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