Synthesis and spectroscopic investigations of Rh(III) and Pd(II) complex compounds with N-(pyridine-2-yl)morpholine-4-carbothioamide

The present paper describes the synthesis and spectral properties of Rh(III) and Pd(II) coordination compounds with N-(pyridine-2yl)morpholine-4-carbothioamide (PMCTA). The compounds have the general composition [RhL2CI2]Cl C2H5OH (1), [PdL2]Cl-2 (2), [PdL2ClO4,), - (C3H6O)-C-2 (2a), [PdLCI,] - 2H(2)O (3). All complexes were characterized by elemental analysis, IR, H-1 NMR, 13 C NMR, XPS and UV-Vis spectra. It has been shown that PMCTA behaves as a bidentate (N,S)-ligand, forming six membered metallocycles and coordinating to the metal ion through the carbothioamide sulfur atom and the pyridine nitrogen atom. The UV-Vis spectra suggest that the Pd(II) complexes are square planar, while the Rh(III) complex has an octahedral geometry. The molecular structure of the Pd(II) complex with PMCTA (M:L = 1:2) was determined by single-crystal X-ray diffraction. (c) 2007 Elsevier Ltd. All rights reserved.