Crystal structure of a solvated dinuclear CuII complex derived from 3,3,3′,3′-tetraethyl-1,1′-(furan-2,5-dicarbonyl)bis(thiourea)

Abstract

In the title compound, [Cu₂(L)₂]·2CH₂Cl₂, the Cu^II ions coordinate two (S,O)-chelating aroyl­thio­urea moieties of doubly deprotonated furan-2,5-di­carbonyl­bis­(N,N-di­ethyl­thio­urea) (H₂L) ligands. The coordination geometry of the metal centers is best described as a flat isosceles trapezoid with a cis arrangement of the donor atoms.

Reaction between equimolar amounts of 3,3,3′,3′-tetraethyl-1,1′-(furan-2,5-dicarbonyl)bis(thiourea) (H₂L) and CuCl₂·2H₂O in methanol in the presence of the supporting base Et₃N gave rise to a neutral dinuclear complex bis­[μ-3,3,3′,3′-tetraethyl-1,1′-(furan-2,5-dicarbonyl)bis(thioureato)]dicopper(II) di­chloro­methane disolvate, [Cu₂(C₁₆H₂₂N₄O₃S₂)₂]·2CH₂Cl₂ or [Cu₂(L)₂]·2CH₂Cl₂. The aroylbis(thio­ureas) are doubly deprotonated and the resulting anions {L^2–} bond to metal ions through (S,O)-chelating moieties. The copper atoms adopt a virtually cis-square-planar environment. In the crystal, adjacent [Cu₂(L)₂]·2CH₂Cl₂ units are linked into polymeric chains along the a-axis direction by inter­molecular coordinative Cu⋯S inter­actions. The co-crystallized solvent mol­ecules play a vital role in the crystal packing. In particular, weak C—H_furan⋯Cl and C—H_eth­yl⋯Cl contacts consolidate the three-dimensional supra­mol­ecular architecture.