FAR IR-SPECTRA AND STRUCTURES OF ZN(II) COMPLEXES OF 2-AMINOTHIAZOLES

IR spectra and molecular structures of ZnI(2)X(2) (L = 2-NH2-4-R-thiaz ole, R = H (at), CH3; 2-NH2-6-R(1)-benzothiazole, R(1) - H (abt), CH3, OCH3, OC2H5 or 2-NH2-tetrahydrobenzothiazole; X = Cl, Br, I) have bee n studied. It was found that the complex character of the far IR spect ra and difficulties in v(NH2) interpretation make conclusions regardin g structure based only on IR data ambiguous, and in some cases discrep ant. 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 te trahedral ZnL(2)X(2) molecules with monodentate ligands coordinated vi a endo-N atoms. It was found that in the coordination tetrahedra MN(2) Cl(2) (M = Co2+, Zn2+) the central atom redistributes electron density between the thiazole ligands and the terminal CI atoms.