The title compound, [Cu(CH)(CHP)] or [Cu(Mes)(PMe)] (Mes = 2,4,6-tri-methyl-phenyl), was synthesized from copper(I) mesityl and tri-methyl-phosphane in THF as solvent. The mol-ecular structure of the complex has symmetry and consists of four copper(I) atoms bridged by four -mesityl groups, giving an eight-membered puckered {CuC} ring. Additionally, two copper(I) atoms at opposite corners of the Cu rhomb are each linked to a terminal PMe ligand. The PMe-bearing copper(I) atoms exhibit a distorted trigonal-planar coordination mode whereas the remaining Cu atoms linked to two mesityl groups are nearly linearly coordinated.
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