Synthesis and crystal structure of a new copper(II) complex based on 5-ethyl-3-(pyridin-2-yl)-1,2,4-triazole.

The title compound, bis-[μ-3-ethyl-5-(pyridin-2-yl)-1-1,2,4-triazol-1-ido]bis[acetato-(di-methyl-formamide)-copper(II)], [Cu(CHN)(CHO)(CHNO)] or [Cu( )(OAc)(dmf)], is a triazolate complex, which contains two 3-(2-pyrid-yl)-5-ethyl-triazolates ( ) in bidentate-bridged coordination modes. Both copper atoms are involved in the formation of a planar six-membered metallocycle Cu-[N-N]-Cu. The inversion center of the complex is located at the mid-point of the Cu⋯Cu vector. Each Cu atom has a distorted trigonal-bipyramidal environment formed by the three nitro-gen atoms of the deprotonated bridging 3-(2-pyrid-yl)-5-ethyl-triazolate unit, oxygen atoms of the OAc group and dmf mol-ecule. In the crystal, C-H⋯O hydrogen bonds link the mol-ecules into chains running along the -axis direction.