Preparation and X-ray crystal structure of a novel tetranuclear copper(I) ethylenethiourea cluster complex, µ4-ethylenethiourea-cyclo-tetrakis-µ-(ethylenethiourea)tetrakis[ethylenethioureacopper(I)] nitrate hexahydrate

Abstract
The structure, geometry, and bonding in [Cu4(C3H6N2S)9(NO3)4],6H2O have been established by X-ray analysis which reveals discrete Cu4(C3H6N2S)9 4+ cations containing an alternating Cu–S eight-membered ring with a unique ethylenethiourea ligand in an axial position bridging four copper atoms.

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