Formation of mixed-metal alkoxides mediated by the reactivity of coordinated pinacol -: Synthesis and molecular structures of Ce2Ti2(μ3-O)2(μ,η2-OCMe2CMe2O)4(OPri)4(PriOH)2 and of Ce2Nb2(μ3-O)2(μ,η2-OCMe2CMe2O)4(OPri)6

被引：34

作者：

Hubert-Pfalzgraf, LG

Abada, V

Vaissermann, J

机构：

[1] Univ Lyon 1, CNRS, UMR, F-69622 Villeurbanne, France

[2] CNRS, UMR, Chim Met Transit Lab, F-07230 Paris, France

来源：

POLYHEDRON | 1999年 / 18卷 / 26期

关键词：

niobium; cerium; titanium; alkoxides; diolates; mixed-metal alkoxides;

D O I：

10.1016/S0277-5387(99)00281-8

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The addition of pinacol to mixtures of titanium and cerium isopropoxides as well as the use of insoluble titanium and cerium pinacolate synthons was investigated as a route to M-Ce (M=Ti, Nb) species. Pinacol was able to promote the formation of mixed-metal species and the first Ce-Ti and Ce-Nb species namely Ce-2Ti(pin)(2)(OPri)(8) and [M2Ce2(mu(3)-O)(2)(mu,eta(2)pin)(4)(OPri)(6)H-x] [M = Ti, x = 2; M = Nb, x = 0; pin = OCMe2-COMe2] were isolated and characterized by FT-IR and H-1 NMR. The latter were also characterized by X-Ray diffraction. Their structures are based on a rhombus compressed along the M...M direction with 6-coordinated metals. The pinacolate moieties act as bridging-chelating ligands. The metal-oxygen bond lengths vary according to M-O(pin)<M-mu(3)-O<M mu-O(pin)<Ce-OPri<Ce-mu(3)O. (C) 1999 Elsevier Science Ltd. All rights reserved.

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页码：3497 / 3504

页数：8

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