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

Investigation of 3,5-dichlorosalicylate-copper(II)-(3-pyridylmethanol or N,N′-diethylnicotinamide) complex systems by EPR spectroscopy

Lucia Husáriková, Zuzana Repická, Dušan Valigura, Marián Valko, and Milan Mazúr

Department of Physical Chemistry, Slovak University of Technology, Radlinského 9, SK-812 37, Bratislava, Slovakia

E-mail: milan.mazur@stuba.sk

Abstract: Copper(II) complex systems, containing 3,5-dichlorosalicylic acid (3,5-Cl₂salH) and different copper salts (Cu(ac)₂ or CuSO₄), with varying concentrations of 3-pyridylmethanol (ronicol, ron) or N,N′-diethylnicotinamide (denia) as ligands, were prepared. The effects of Cu(II) salts containing anions of different basicity and two different N-donor ligands with varying ligand-to-metal ratio (x) on the formation of the resultant complexes in the water/methanol solutions were studied by EPR spectroscopy at low temperature of 98 K. When ligand concentration was increased, the resolution and signal intensity of the ¹⁴N perpendicular super-hyperfine splitting patterns increased (for ron more progressively), becoming saturated at higher ligand concentrations. In comparing the ronicoland denia-containing systems, both g-factors (g_⊥, g_‖) are systematically higher and the parallel hyperfine splitting (A_‖) systematically lower in denia-containing systems for both Cu(II) salts.

Keywords: 3,5-dichlorosalicylic acid – 3-pyridylmethanol – N,N′-diehylnicotinamide – copper(II) complexes – EPR spectroscopy

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-013-0390-0

Chemical Papers 67 (10) 1330–1344 (2013)