Synthesis and structural studies on divalent transition metal complexes of 5-acetyl 2,4-dihydroxy acetophenone semicarbazone

Department of Chemistry, Osmania University College for Women, Osmania University, Hyderabad-500 095, India E-mail : abbareddysaritha@hotmail.com Department of Chemistry, University College of Engineering, Osmania University, Hyderabad-500 007, India E-mail : satyambchem@yahoo. co .in; narayana satya 1969@yahoo .co. in Manuscript received 5 July 2006, revised 5 September 2006, accepted 5 September 2006 The synthesis of divalent transition metal complexes of a new dibasic, bis-chelating ligand 5-acetyl 2,4 dihydroxy acetophenone semicarbazone (H2ADAS) with Mnll, Coll, Nill, Cull and Zull and their characterization on the basis of their elemental analyses, conductivity, magnetic moments, infrared and electronic spectral data has been studied. Metal to ligand ratio in all the chelates has been found to be 1 : 1. The Schiff base behaves in a dibasic pentadentate manner with OO and ONN donor atoms. All the complexes have been assigned octahedral stereochemistry. The ligand H2-ADAS forms polymeric metal complexes with first row divalent transition metal ions