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Abstract
IR spectra and molecular structures of ZnL2X2 (L = 2-NH2-4-R-thiazole, R = H (at), CH3; 2-NH2-6-R1 -benzothiazole, R1 = H (abt), CH3, OCH3, OC2H5 or 2-NH2-tetrahydrobenzothiazole; X = Cl, Br, I) have been studied. It was found that the complex character of the far IR spectra and difficulties in v(NH2) interpretation make conclusions regarding structure based only on IR data ambiguous, and in some cases discrepant. Single crystal X-ray data for the complexes with L = at, X = Br, I and L = abt, X = Br show that structures are built up of discrete tetrahedral ZnL2X2 molecules with monodentate ligands coordinated via endo-N atoms. It was found that in the coordination tetrahedra MN2Cl2 (M = Co2+, Zn2+) the central atom redistributes electron density between the thiazole ligands and the terminal Cl atoms.
