Synthesis of tetraaza macrocyclic PdII complexes; antibacterial and catalytic studies

Abstract

Department of Chemistry, Kakatiya University, Warangal-506 009, Andhra Prasesh, India <em>E-mail</em>: [e-mail] Department of Chemistry, National Dong Hwa University, Hualien, Taiwan <em>Manuscript received 25 January 2008, revised 11 September 2008, accepted 16 September 2008</em> A series of new Schiff base Pd^II complexes of the type [Pd(L)]x₂ [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 (¹H, ¹³C), 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 <em>in vitro</em> to evaluate their activity against Gram -ve and Gram -ve bacteria and were found to be more active than streptomycin and ampicillin. [Pd(HBOADO)]CI₂ and [Pd(OBACD)]CI₂ complexes were studied on the catalytic reduction reactions of 2-nitroanlsole, 3-nitroanisole, 4-nitroanisole, 2-nitrohenzoicacid, 3-nitrobenzoicacld, 4-nitrobenzolcacid 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)]CI₂ is found to be more efficient than [Pd(OBACD)]Cl_2.