Spectroscopic and thermal studies of Mn(II), Co(II) and Ni(II) bromide m-methylaniline complexes

The complexes of the MBr2L2 [M: Mn(II), Co(II) and Ni(II); L: m-methylaniline (mMA)] form have been prepared and characterized by their elemental analyses, thermogravimetric analyses, magnetic moment measurements, UV-vis, IR and Raman spectral studies. Elemental analysis suggests the stoichiometry to be 1:2 (metal:ligand). Thermal decomposition studies, using thermogravimetry show that the intermediate metal complexes are formed for complexes during their decomposition processes. the metal oxide being finally produced in each case. IR and Raman bands of the complexes have been assigned as compared with the free ligand. Coordination effects on the internal modes of mMA have been discussed. A polymeric octahedral geometry around metal ion with bridging bromides has been proposed for the Mn(II) and Ni(II) complexes, while tetrahedral geometry around Co(II) ion with C-2v symmetry is suggested for the Co(II) complex. (C) 2003 Elsevier B.V. All rights reserved.