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 H -1,2,4-triazol-1-ido]bis[acetato-(di-methyl-formamide)-copper(II)], [Cu 2 (C 9 H 9 N 4 ) 2 (C 2 H 3 O 2 ) 2 (C 3 H 7 NO) 2 ] or [Cu 2 ( L Et ) 2 (OAc) 2 (dmf) 2 ], is a triazolate complex, which contains two 3-(2-pyrid-yl)-5-ethyl-triazolates ( L Et ) - in bidentate-bridged coordination modes. Both copper atoms are involved in the formation of a planar six-membered metallocycle Cu-[N-N] 2 -Cu. The inversion center of the complex is located at the mid-point of the Cu⋯Cu vector. Each Cu II 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 c -axis direction.