ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Structural study and magnetic properties of copper(II) thiophene-2-carboxylate with 4-pyridinemethanol and isonicotinamide

Peter Segľa, Vladimír Kuchtanin, Miroslav Tatarko, Jozef Švorec, Ján Moncol, and Marian Valko

Slovak University of Technology in Bratislava, Bratislava, Slovakia

E-mail: peter.segla@stuba.sk

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), [Cu₂(2-tpc)₄(4-pyme)₂] (VI), [Cu₂(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.

Keywords: Complex ; Copper(II) ; Thiophenecarboxylate ; 4-Pyridinemethanol ; Isonicotinamide 

Full paper is available at www.springerlink.com.

DOI: 10.1007/s11696-017-0309-2

Chemical Papers 72 (4) 863–876 (2018)