engleski

Cyclometalated Cluster Complex with a Butterfly-Shaped Pt2Ag2 Core

The cyclometalated platinum complex [PtMe(bhq)(dppy)] (<b>1</b>), in which bhq = benzo{; ; ; <i>h</i>}; ; ; quinoline and dppy = 2-(diphenylphosphino)pyridine, was prepared by the reaction of [PtMe(SMe₂)(bhq)] with 1 equiv of dppy at room temperature. Complex <b>1</b> contains one free pyridyl unit and was readily characterized by multinuclear NMR spectroscopy and elemental microanalysis. The reaction of complex <b>1</b> with 1 equiv of [Ag(CH₃CN)₄]BF₄ gave the cyclometalated cluster complex [Pt₂Me₂(bhq)₂(μ ; -dppy)₂Ag₂(μ ; -acetone)](BF₄)₂ (<b>2</b>) in 70% yield. The crystal structure of complex <b>2</b> was determined by X-ray crystallography, indicating a rare example of a butterfly cluster with a Pt₂Ag₂ core in which the Ag atoms occupy the edge-sharing bond. In solution, the bridging acetone dissociates from the cluster complex <b>2</b>, but as shown by NMR spectroscopy, the Pt₂Ag₂ core is retained in solution and a dynamic equilibrium is suggested to be established between the planar and butterfly skeletal geometries.

cyclometalated cluster; silver; platinum; argentophilic interaction

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