Crystal structure of trans -bis-[2-(1 H -benzotriazol-1-yl)acetato-κ O ]bis-(ethano-lamine-κ 2 N , O )copper(II)

The reaction of 2-(1 -benzotriazol-1-yl)acetic acid (HBTA; C H N O ) and mono-ethano-lamine (MEA; C H NO) with CuCl ·2H O resulted in the formation of the title complex, [Cu(C H N O ) (C H NO) ] or [Cu(BTA) (MEA) ]. Its asymmetric unit comprises one BTA anion coordin-ating to the Cu cation (site symmetry ) through the carboxyl O atom, and one MEA ligand chelating the metal cation by two heteroatoms (O and N). The equatorial Cu-O and Cu-N bond lengths are similar at 2.029 (1) and 1.980 (2) Å, respectively, while the length of the axial Cu-O bond is considerably greater [2.492 (2) Å], as is typical for Jahn-Teller-distorted systems. An intra-molecular hydrogen bond is present between the hy-droxy group of the MEA ligand and the non-coordinating O atom of the carboxyl-ate group. Inter-molecular hydrogen bonding involving the amino function of the MEA ligand and the carboxyl-ate group results in eight-membered rings with an (8) graph-set motif. The mol-ecules are further linked by C-H⋯π inter-actions involving the triazole rings and methyl-ene groups of MEA, thus generating an overall three-dimensional supra-molecular framework.