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Some novel Schiff base metal complexes of Cr(III), Co(II), Ni(II) and Cu(II)  derived from 2-[(5-bromo-2-hydroxybenzylidene)amino]pyridin-3-ol (BSAP) and  {5-chloro-2-[(2-hydroxynaphthylidene)amino]phenyl}-phenylmethanone (HNAC)  were synthesized by conventional as well as microwave methods. These  compounds were characterized by elemental analysis, FT-IR, FAB-mass, molar  conductance, electronic spectra, ESR, magnetic susceptibility, thermal,  cyclic voltammetry, electrical conductivity and XRD analyses. Analytical data  revealed that all the complexes exhibited 1:1 (metal:ligand) ratio with  coordination number 4 or 6. IR data showed that the ligand coordinates with  the metal ions in a tridentate manner. FAB-mass and thermal data showed  degradation pattern of the complexes. The thermal behaviour of metal  complexes showed that the hydrated complexes lose water molecules of  hydration in the first step; followed by decomposition of ligand molecules in  the subsequent steps. The crystal system, lattice parameter, unit cell volume  and number of molecules in unit cell in the lattice of complexes were  determined by XRD analysis. XRD patterns indicate crystalline nature for the  complexes. The solid state electrical conductivity of the metal complexes was  also measured. Solid state electrical conductivity studies reflect  semiconducting nature of the complexes. The Schiff base and metal complexes  displayed a good activity against the Gram-positive bacteria; Staphylococcus  aureus and Gram-negative bacteria; Escherichia coli and fungi Aspergillus  niger and Candida albicans. The antimicrobial results also indicate that the  metal complexes displayed better antimicrobial activity as compared to the  Schiff bases

Microwave synthesis and spectral, thermal and antimicrobial activities of some novel transition metal complexes with tridentate Schiff base ligands