Abstract
Organochalcogenolate-bridged cyclometalated palladium(II) complexes of the formulae, [Pd2(μ-Epy)2(Me2NCH2C6H4-C,N)2] (2) (E = S (2a), Se (2b)), [Pd2(μ-SAr)(μ-Cl)(Me2NCH2C6H4-C,N)2] (3) (Ar = Ph (3a), Mes (Mes = 2,4,6-Me3C6H2) (3b)) and [Pd2(μ-SeAr)2(Me2NCH2C6H4-C,N)2] (4) (Ar = Ph (4a), Mes (4b)), have been synthesized by the reactions of [Pd2(μ-Cl)2(Me2NCH2C6H4-C,N)2] with lead or sodium salts of the chalcogenolate ligand. These complexes have been characterized by elemental analysis, mass spectral data, and NMR (1H and 77Se{1H}) spectroscopy. The molecular structure of 2, determined by single crystal X-ray diffraction analysis, revealed a Epy-bridged head-to-tail arrangement in which the eight-membered “(PdECN)2” ring adopts a distorted twist boat conformation. The Pd····Pd separation in 2a is within the van-der-Waals interaction but in 2b it is too large to support the presence of any metal–metal interaction. The thermal behavior of these complexes has been studied by thermogravimetric analysis.
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Acknowledgments
The authors thank Dr. T. Mukherjee for encouragement of this work.
Supplementary materials are available for this article. Go to the publisher's online edition of Phosphorus, Sulfur, and Silicon and the Related Elements for the following free supplemental files: Additional figures.