Copper(I) halide complexes with a sterically hindered thiourea: synthesis and crystal structures of [Cu(dchtu)₂Cl] and [Cu(dchtu)₂Br] (dchtu =N,N′-dicyclohexylthiourea)

Abstract

Copper(I) complexes with a sterically hindered thiourea, [Cu(dchtu)₂X] (dchtu = N,N′-dicyclohexylthiourea; X=Cl 1, Br 2), were synthesized and their crystal structures were determined. Compounds 1 and 2 are isostructural orthorhombic, space group P2₁2₁2₁. Crystallographic data for 1 : a = 13.1711(13), b = 14.2610(19), c = 15.793(2) Å, V = 2966.4(6) ų, Z = 4. For 2 : a = 13.2628(13), b = 14.3410(19), c = 15.860(2) Å, V = 3016.5(6) ų, Z = 4. The stoichiometry of CuX complexes with thiourea is influenced by substituents on the nitrogens. Copper(I) halides only form bis-adducts with the sterically hindered dchtu ligand even with molar excesses of dchtu due to steric hinderance of the cyclohexyl substituents. In 1 and 2, the Cu(I) is trigonally coordinated by the sulfur atoms of two monodentate N,N′-dicyclohexylthiourea ligands and one halide. The structures of the complexes are stabilized by a system of intermolecular H-bonding.

Keywords:

• Synthesis
• Crystal structure
• Copper(I) complex
• N,N′-dicyclohexylthiourea

Acknowledgements

This work was supported by the Natural Science Foundation of Universities of Jiangsu Province (No. 05KJB150110) and the Key Laboratory of Organic Synthesis of Jiangsu Province, Suzhou University.