Pyrazole-bridged NHC ligands and their dimetallic (allyl)palladium complexes

被引：44

作者：

Scheele, Ulrich J. ^{[1
]}

John, Michael ^{[1
]}

Dechert, Sebastian ^{[1
]}

Meyer, Franc ^{[1
]}

机构：

[1] Univ Gottingen, Inst Anorgan Chem, D-37077 Gottingen, Germany

来源：

EUROPEAN JOURNAL OF INORGANIC CHEMISTRY | 2008年 / 03期

关键词：

N-heterocyclic carbenes (NHC); palladium; pyrazole; dimetallic complexes; bridging ligands; X-ray crystal structures;

D O I：

10.1002/ejic.200701230

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

A set of compartmental pyrazole-based ligands with appended NHC donors has been synthesized and isolated as [H4L]Cl-3 and [H3L](PF6)(2) salts. Dinuclear (allyl)palladium complexes of these ligands are conveniently accessible via the in situ prepared silver species. Three complexes [(allyl)(2)Pd2L]PF6 and one derivative [(methallyl)(2)Pd2L]PF6 have been characterized crystallographically, which revealed that the metal ions are positioned in close proximity [d(Pd center dot center dot center dot Pd) = 3.97-4.05 angstrom], with two possible mutual orientations of the (meth)allyl ligands within the dimetallic pocket. NMR spectroscopy shows slow interconversion of these isomers (k = 0.05-0.4 s(-1)), where the (meth)allyl ligands are detached trans to the carbene during this eta(3)-eta(1)-eta(3) dynamic process. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008).

引用

页码：373 / 377

页数：5

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