Spectral, thermal and magnetic properties of 5-chloro-2-methoxybenzoates of Zn(II), Cu(II), Ni(II), Co(II) and Mn(II)

The complexes of 5-chloro-2-methoxybenzoates with Zn(II), Cu(II), Ni(II), C o(II) and Mn(II) have been synthesized as polycrystalline solids and charac terized by elemental analysis, IR and FIR spectroscopy, thermogravimetric a nd magnetic studies and X-ray diffraction measurements. The complexes posse ss colours typical of the Me(II) ions (Cu - blue, Ni - green, Co - pink, Zn - white and kin - slightly pink). The carboxylate group binds as a symmetr ical. bidentate, chelating ligand (complexes of Co(LI), Ni(II), Zn(LI) and Mn(II)) and bidentate bridging for 5-chloro-2-methoxybenzoate of Cu(II). The thermal stabilities were determined in air and in nitrogen atmospheres. When heated, they dehydrate to form anhydrous salts, which are decomposed in air to the oxides of the respective metals or to the mixture of the oxid es and carbon. The magnetic susceptibilities of the complexes were measured over the range 77-300 K and magnetic moments were calculated. The results show them to be high-spin complexes.