Structural and magnetic studies on a new mixed-valence Cu(I)–Cu(II) octanuclear cluster with a dithiocarbamate derivative

Abstract

A new mixed-valence Cu(I)–Cu(II) octanuclear cluster, [ Cu I Cu II ( n - Pr 2 dtc ) Cl 2 ] 2 [ Cu 2 II ( n - Pr 2 dtc ) 2 Cl 2 ] 2 ( 1) ( n-Pr 2dtc − = di- n-propyl-dithiocarbamate) with a dithiocarbamate derivative has been synthesized and structurally characterized. Complex 1 consists of a mixed-valence Cu(I)–Cu(II) tetranuclear unit and two chloride-bridged Cu(II) dinuclear units. The octanuclear cluster forms an infinite one-dimensional assembly by weak Cu⋯Cl and Cu⋯S coordination bonds between the chloride bridged dinuclear units. The magnetic study indicates the existence of a strong antiferromagnetic interaction ( J = −35.6 cm −1) between the copper ions of the chloride-bridged Cu(II) dinuclear unit, Cu 2 II ( n - Pr 2 dtc ) 2 Cl 2 .