Crystal structure and spectroscopic characterization of a coordination polymer of Copper(II) chloride with ethylenediamine and the 2-hydroxybenzoate ion

Resumo

A new mixed-ligand one-dimensional copper(II) coordination polymer [Cu(en)(sal)Cl]_n where en = ethylenediamine(C₂H₈N₂) and Hsal = 2-hydroxybenzoic acid (salicylic acid; C₇H₆O₃) is synthesized and characterized by FTIR spectroscopy and single crystal X-ray diffraction. The structure contains Cu²⁺ ions in two different distorted octahedral coordination environments: an axially extended CuN₄Cl₂ moiety arising from a pair of bidentate en ligands and a CuO₄Cl₂ moiety arising from a pair of asymmetrically coordinated sal^– anions. The chloride ions bridge the copper ions into a zigzag chain propagating in [001]. The structure is consolidated by N–H•••O and N–H•••Cl hydrogen bonds which generate a layered network. Crystal data: C₉H₁₃ClCuN₂O₃, M_r = 296.20, monoclinic, P2₁/c, a = 13.9179(10) Å, b = 10.4900(8) Å, c = 8.5181(6) Å, β = 105.518(4)°, V = 1198.30(15) ų, Z = 4, R(F) = 0.026, wR(F²) = 0.068.