Synthesis, characterization and crystal structure determination of mononuclear and dinuclear copper(II) carboxylates: [Cu(Hdpa)₂(en)] and [{Cu₂(μ-na)₄(CH₃OH)₂} ·2CH₃OH]

چکیده مقاله

Two new copper complexes [Cu(Hdpa)₂(en)] (1) and [{Cu ₂(μ-na)₄(CH₃OH)₂}·2CH ₃OH] (2) (where en is ethylene diamine, Hdpa is 2'-carboxy-[1,10- biphenyl]-2-carboxylate anion and na is 1-naphtalenecarboxylate) have been synthesized and their crystal structures were determined by X-ray crystallography. Complex 1 was prepared from the reaction of Cu(NO ₃)₂·3H₂O with ethylene diamine and 2,2′-biphenyldicarboxylic acid in a mixture of water and methanol and complex 2 was prepared from the reaction of CuSO₄·5H ₂O with 1-naphtalenecarboxylic acid in methanol. The two complexes were characterized by IR, UV-vis, luminescence and elemental analysis. Moreover, complex 2 was characterized by EPR spectroscopy and thermogravimetric analysis. Complex 1 is a monomer and complex 2 is a dimer with a paddle-wheel structure; both structures are without precedent in the literature. © 2013 Iranian Chemical Society.