CRYSTAL STRUCTURE OF TRANS-BIS[2-(1H-BENZOTRIAZOL-1-YL)ACETATO-κO]BIS(ETHANOLAMINEκ2N,O)COPPER(II)
The reaction of 2-(1H-benzotriazol-1-yl)acetic acid (HBTA) and monoethanolamine (MEA) with CuCl2·2H2O resulted in the formation of the title complex [Cu(BTA)2(MEA)2]. Its asymmetric unit comprises one BTA anion coordin-ating to the Cu2+ cation 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) A˚, respectively, while the length of the axial Cu-O bond is considerably greater [2.492 (2) A˚], as is typical for Jahn–Teller-distorted systems. An intramolecular hydrogen bond is present between the hydroxy group of the MEA ligand and the non-coordinating oxygen atom of the carboxylate group. Intermolecular hydrogen bonds lead to the formation of a three-dimensional supramolecular framework.
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