Abstract
The synthesis and characterization of [Cu(5-Me-2-tpc)(2)(4-pyme)(2)] (I), [Cu(3-Me-2-tpc)(2)(4-pyme)(2)] (II), [Cu(2-tpc)(2)(4-pyme)(2)] (III), [Cu(2-tpc)(2)(isonia)(2)(2-tpcH)] (IV), [Cu(5-Me-2-tpc)(2)(isonia)(2)(5-Me-2-tpcH)] (V), [Cu-2(2-tpc)(4)(4-pyme)(2)] (VI), [Cu-2(3-Me-2-tpc)(4)(isonia)(2)] (VII) (where 2-tpc is 2-thiophenecarboxylate, 3-Me-2-tpc is 3-methyl-2-thiophenecarboxylate, 5-Me-2-tpc is 5-methyl-2-thiophenecarboxylate and 4-pyme is 4-pyridinemethanol and isonia is isonicotinamide) are reported. The complexes under study were characterized by electronic, IR and EPR spectroscopy, magnetic susceptibility over the temperature range and X-ray structure analysis. Structural studies revealed a distorted tetragonal-bipyramidal environment around the copper ion for monomeric complexes I-V. The structure of dimeric complexes VI and VII consists of units of the known paddle-wheel dicopper(II) tetracarboxylates, which are made up of four thiophene-2-carboxylate ions thus bridging the two copper atoms. The complex molecules of all compounds are connected through H-bonds into supramolecular chains or frameworks. The spectral and magnetic properties are discussed with regard to X-ray data.