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

Reaction between equimolar amounts of 3,3,3',3'-tetraethyl-1,1'-(furan-2,5-dicarbonyl)bis(thiourea) (<b>H₂L</b>) 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) di-chloro-methane disolvate, [Cu₂(C₁₆H₂₂N₄O₃S₂)₂]·2CH₂Cl₂ or [Cu₂(<i>L</i>)₂]·2CH₂Cl₂. The aroylbis(thio-ureas) are doubly deprotonated and the resulting anions {<i>L</i> ^2-} bond to metal ions through (<i>S</i>,<i>O</i>)-chelating moieties. The copper atoms adopt a virtually <i>cis</i>-square-planar environment. In the crystal, adjacent [Cu₂(<i>L</i>)₂]·2CH₂Cl₂ units are linked into polymeric chains along the <i>a-</i>axis direction by inter-molecular coordinative Cu⋯S inter-actions. The co-crystallized solvent mol-ecules play a vital role in the crystal packing. In particular, weak C-H_furan⋯Cl and C-H_eth-yl⋯Cl contacts consolidate the three-dimensional supra-mol-ecular architecture.