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The title compound, [Cu 2 Cl 4 (C 5 H 10 N 2 O 2 ) 2 (CH 3 CN) 2 ] or [Cu 2 (μ 2 -Cl) 2 (CH 3 -Pz-COOCH 2 CH 3 ) 2 Cl 2 (CH 3 CN) 2 ], was synthesized using a one-pot reaction of copper powder, copper(II) chloride dihydrate and ethyl 5-methyl-1 H -pyrazole-3-carboxyl-ate (CH 3 -Pz-COOCH 2 CH 3 ) in aceto-nitrile under ambient conditions. This complex consists of discrete binuclear mol-ecules with a {Cu 2 (μ 2 -Cl) 2 } core, in which the Cu⋯Cu distance is 3.8002 (7) Å. The pyrazole-based ligands are bidentate coordinated, leading to the formation of two five-membered chelate rings. The coordination geometry of both copper atoms (ON 2 Cl 3 ) can be described as distorted octa-hedral on account of the aceto-nitrile coordination. A Hirshfeld surface analysis suggests that the most important contributions to the surface contacts are from H⋯H (40%), H⋯Cl/Cl⋯H (24.3%), H⋯O/O⋯H (11.8%), H⋯C/C⋯H (9.2%) and H⋯N/N⋯H (8.3%) inter-actions.

acta crystallographica. section e, crystallographic communications

Crystal structure and Hirshfeld surface analysis of di-μ-chlorido-bis[(acetonitrile-κN)chlorido(ethyl 5-methyl-1H-pyrazole-3-carboxylate-κ2 N 2,O)copper(II)]