A Dimeric Copper(II) Complex of Oxalate and Oxamide Dioxime Ligands: Synthesis, Crystal Structure, Thermal Stability, and Magnetic Properties

作者：Nenwa Justin^*; Djonwouo Patrick L; Nfor Emmanuel N; Belombe Michel M; Jeanneau Erwann; Mbarki Mohammed; Fokwa Boniface P T

来源：Zeitschrift Fur Naturforschung Section B-a Journal of Chemical Sciences, 2014, 69(3): 321-326.

DOI：10.5560/ZNB.2014-3309

• Oxalate
• Oxamide Dioxime
• Cu(II) Complex
• Crystal Structure

The dimeric copper(II) complex [Cu(C2O4)(H(2)oxado)(H2O)](2) (1), where H(2)oxado = oxamide dioxime, has been synthesized in water and characterized by elemental and thermal analyses, IR spectroscopy, and single-crystal X-ray diffraction. Complex 1 is composed of two neutral [Cu(C2O4)(H(2)oxado)(H2O)] entities connected by Cu-O bonds between oxalate oxygen atoms and copper(II) ions, thereby producing a centrosymmetric dimer, with the Cu(II) centers exhibiting a strongly distorted octahedral coordination. Neighboring dimers are hydrogen-bonded through O-H center dot center dot center dot O interactions leading overall to a layer structure. Thermal analyses of complex 1 showed two significant weight losses corresponding to the coordinated water molecules, followed by the decomposition of the network. Variable-temperature (10-300 K) magnetic susceptibility measurements revealed very weak antiferromagnetic interactions (theta = -0.86 K from Curie-Weiss law behavior) within the dinuclear unit.

• 出版日期2014-3