First Polythioplatinate(II) Synthesized

First Polythioplatinate(II) Synthesized

Author: ChemistryViews

Metal complexes that contain sulfur atoms can play important roles both in industrial catalysis and biological systems. For example, multinuclear metal complexes with bridging sulfido ligands of the type [Pt22-S)2L4] are promising precursors for some catalytic applications. The ligand L in these complexes is usually a phosphine derivative.

Ulrich Kortz Jacobs University, Bremen, Germany, and colleagues have synthesized the all-inorganic trinuclear Pt(II) complex [Pt3S2(SO3)6]10−, the first polythioplatinate(II) (pictured). The team synthesized the complex in the form Na10[Pt3S2(SO3)6]·22H2O from H2Pt(OH)6 and Na2S2O3 in an alkaline aqueous solution that was heated to 150 °C in an autoclave.

The team characterized the product using X-ray crystallography and found that the polythioplatinate anion comprises three Pt(II) ions linked by two μ3-sulfido ligands and capped by six sulfito ligands overall. Each platinum center has a square-planar coordination.

The researchers immobilized the complex on mesoporous silica (SBA-15) to investigate its catalytic activity. The resulting precatalyst showed excellent activity in the hydrogenation of o-xylene to give dimethylcyclohexanes, which was used as a model reaction. The team found that cis-1,2-dimethylcyclohexane was the major product at 150 °C, while trans-1,2-dimethylcyclohexane was the major product at 350 °C. The catalyst was recyclable and retained its activity for several runs of the reaction.


 

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