Syntheses, characterization, X-ray structural determination, and packing analyses of ternary copper(II) complexes: [Cu(2-phenoxyacetate/4-chlorobenzoate)2(temed)

Abstract

Two new ternary copper(II) complexes [Cu(2-phenoxyacetate)2(temed)] (1) and [Cu(4-chlorobenzoate)2(temed)] (2) are synthesized by the addition of temed (N,N,N',N'-tetramethylethylenediamine) to Cu(II) 2-phenoxyacetate/4-chlorobenzoate in a water:methanol (1:4, V/V) mixture. The newly synthesized complexes are characterized by elemental analyses, spectroscopic techniques (UV-Vis, FTIR), magnetic moment, molar conductance and single crystal X-ray diffraction. In both crystals, the asymmetric unit consists of one half of the neutral complex in which the central metal atom lies on a glide plane in 1 and on a twofold axis in 2. Both ternary complexes are neutral and consist of six coordinated CuN2O4 chromophores. In both complexes, the Cu(II) metal centre is coordinated by two nitrogen atoms of chelating temed and four oxygen atoms from two bidentate 2-phenoxyacetate/4-chlorobenzoate ligands. Detailed packing analyses of complexes 1 and 2 reveal that the C—H…p interaction along with weak intermolecular C—H…O hydrogen bonding interactions provide the stability and robustness of the crystal lattice.