Tantalum chloride species incorporating anionic and cationic guanidine components

被引：15

作者：

Soria, DB ^{[1
]}

Grundy, J ^{[1
]}

Coles, MP ^{[1
]}

Hitchcock, PB ^{[1
]}

机构：

[1] Univ Sussex, Dept Chem, Brighton BN1 9QJ, E Sussex, England

来源：

POLYHEDRON | 2003年 / 22卷 / 19期

基金：

英国工程与自然科学研究理事会;

关键词：

tantalum; bicyclic guanidinate; intermolecular hydrogen bonds; coordination isomer; dodecahedral geometry;

D O I：

10.1016/S0277-5387(03)00364-4

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Attempted preparation of tantalum complexes incorporating the anionic guanidinate ligand derived from 1,3,4,6,7,8-hexahydro-2H-pyrimido[1,2-a]pyrimidine (hppH) are reported. Reaction of (hpp)SiMe3 and TaCl5 in a 1:1 ratio gave the bis-guanidinate compound rather than the expected mono-ligand species. Reaction of 2 equiv of (hpp)SiMe3 or in situ generated [hpp]Li with TaCl5 afforded a solid which analysed correctly for the compound (hpp)(2)TaCl3. X-ray structural analysis of the crystallised product identified the coordination isomer [Ta(hPP)(4)][TaCl6], with a distorted dodecahedral cation and a regular octahedral anion. During the course of this study, two closely related hydrolysis products, [(hppH(2))](2)[{TaCl6}{Cl}] and [(hppH(2))](3)[{TaCl6}(2){Cl}].MeCN were isolated and structurally characterised, each containing [hppH(2)](+) cations and [Cl](-) and [TaCl6](-) anions in extended arrays, linked by intermolecular hydrogen bonds. (C) 2003 Elsevier Ltd. All rights reserved.

引用

页码：2731 / 2737

页数：7

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