Synthesis of tetraaza macrocyclic PdII complexes; antibacterial and catalytic studies

A series of new Schiff base Pd II complexes of the type [Pd(L)]X 2 [where, L = HBOADO, TBACD, OBACD, HBOADT, DBACDT, TBAHD and X = Cl - ] have been synthesized by non-template method. The complexes were characterized with the help of elemental analyses, conductance measurements, magnetic measurements, infrared, NMR ('H, 13 C), mass, electronic spectral studies and thermal analysis. Based on the spectral data, square-planar geometry Is tentatively proposed to all the complexes. The biological activities of these complexes have been tested in vitro to evaluate their activity against Gram +ve and Gram -ve bacteria and were found to be more active than streptomycin and ampicillin. [Pd(HBOADO)]Cl 2 and [Pd(OBACD)]Cl 2 complexes were studied on the catalytic reduction reactions of 2-nitroanisole, 3- nitroanisole, 4-nitroanisole, 2-nitrobcnzoicacid, 3-nitrobenzoicacid, 4-nitrobenzoicacid under mild conditions. The reduced products were treated with nitrous acid followed by β-naphthol and the developed colored products were determined spectrophotometrically. [Pd(HBOADO)]Cl 2 is found to be more efficient than [Pd(OBACD)]Cl 2 .