Isomerism in tetrahedral rhenium cluster complexes [Re4Q4(PMe2Ph)4X8]·nCH2Cl2 (Q = Se, X = Br; Q = Te, X = Cl, Br)

Three new tetrahedral rhenium cluster compounds [Re4Se4(PMe2Ph)4Br8]·1.5CH2Cl2 (1), [Re4Te4(PMe2Ph)4Br8]·CH2Cl2 (2), and [Re4Te4(PMe2Ph)4Cl8]·CH2Cl2 (3) have been synthesized by the reaction of the corresponding precursor chalcohalide complexes [Re4Q4(TeX2)4X8] (X = Br, Q = Se (for 1), Te (for 2); X = Cl, Q = Te (for 3)) with dimethylphenylphosphine in CH2Cl2. All compounds have been characterized by X-ray single-crystal diffraction and elemental analyses, IR and 31P NMR spectroscopy. 31P NMR spectroscopy indicates the formation of isomers in solution, confirmed by single-crystal X-ray analysis.

Graphical abstractThree new tetrahedral rhenium cluster compounds [Re4Q4(PMe2Ph)4X8]·nCH2Cl2 (X = Br, Q = Se (1), Te (2); X = Cl, Q = Te (3)) have been synthesized by reaction [Re4Q4(TeX2)4X8] (X = Br, Q = Se (for 1), Te (for 2); X = Cl, Q = Te (for 3)) with dimethylphenylphosphine in dichloromethane. All compounds have been characterized by single-crystal X-ray diffraction analysis. Different isomers were found to be crystallized out by layering of diethylether on CH2Cl2 solution.Figure optionsDownload full-size imageDownload as PowerPoint slide