Synthesis, spectral, thermal and structural characterization of{[Cu(H2O)3][Cu(MAL)2]•2H2O}∞ and [Cu(MAL)(TEA)]•H2O (MAL = malonate and TEA = triethanolamine)

A polymeric malonato-bridged copper(II) complex, {[Cu(H2O)(3)][Cu(MAL)(2)] . 2H(2)O}(infinity), and a mononuclear malonato-copper(II) complex with triethanolamine, [Cu(MAL)(TEA)] . H2O, have been prepared and characterized by elemental analyses, i.r., u.v. - vis, magnetic measurements and single crystal X-ray diffraction. The polymeric complex consists of one-dimensional chains containing the MAL bridged [Cu(H2O)(3)](2+) and [Cu(MAL)(2)](2-) ions and each MAL ligand simultaneously exhibits chelating bidentate (at one copper atom) and bridging ( at the adjacent copper atom) coordination modes. The intrachain Cu1...Cu2 separation is 4.963 Angstrom and the polymeric complex exhibits antiferromagnetic behaviour. In the mononuclear complex, the copper(II) ion is octahedrally coordinated by one bidentate MAL and one tetradentate neutral TEA ligands. The i. r. spectra and thermal decompositions of both complexes are described.