89 - ASSAM U IVE N RSITY Assam University Journal of...

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- 81 - Technology : Physical Sciences and Technology Vol. 5 Number II 81-87, 2010 A S M U N IVE RS IT Y I L C H R Transition Metal Complexes of a Neutral [N 2 O 2 ] Donor Schiff Base Derived from Furfuraldehyde and Hydrazine Hydrate : Synthesis, Characterization and Redox Behaviour Chira R Bhattacharjee 1 , Pankaj Goswami 2 , Sankar Neogi 3 and Saptarshi Dhibar 1 1 Department of Chemistry, Assam University, Silchar 788011, Assam, India 2 Department of Chemistry, Silchar Polytechnic, Silchar 788015, Assam, India 3 Department of Chemistry, Haflong Govt. College, Haflong, Assam, India 2 corresponding author Tel : +919435175671 Fax : +913842270803 Correspondence; 1 e-mail : crbhattacharjee@rediffmail.com Abstract Neutral [N 2 O 2 ] donor tetradentate Schiff base derived from furfuraldehyde and hydrazine hydrate and its complexes with VO(IV), Fe(III), Co(II), Ni(II), Cu(II) and Zn(II) have been prepared and characterized by physical, spectral and analytical studies.The complexes have a stoichiometry [ML(H 2 O) n ]X m (M=VO, Fe, Co, Ni, Cu and Zn ; n=0 or 2 ; X=SO 4 , NO 3 or CH 3 COO ; m=1, 2 or 3). An octahedral geometry were proposed for the Fe(III) and Co(II) complexes and a square pyramidal geometry for the VO(IV) complex. While Ni(II), Cu(II) and Zn(II) complexes were conjectured to possess a square planar geometry. The redox behaviour of the complexes were examined by cyclic voltammatric studies. Key words : Tetradentate Schiff Base, Hydrazine Hydrate, Furfuraldehyde. Introduction Compounds containing imines have not only found extensive application in organic synthesis, but several of these molecules display significant biological activity (Miyaura et. al . 1995, Baleizno et. al. 2004, Bandini et al. 2002, Canali and Sherrington, 1999). In the last decade Schiff base ligands have received extensive attention mainly because of their wide application in the field of catalysis and due to their antimicrobial (Chouhan and Sheazi, 1999), anti-tuberculosis (Jayabalakrishnan and Natarajan, 1999), and antitumour activity (Jeeworth et al. 2000). They easily form stable complexes with most transition metal ions. Schiff base complexes derived from heterocyclic compounds have found increased interest in the context of bioinorganic chemistry (Chaviara et al. 2004, Ciller et al. 2009, Agarwal and Hingorani, 1990). Heterocyclic compounds such as pyridine, 2, 2 / -bipyridine and related molecules are good ligands due to the presence of one or more ring nitrogen atoms with a localized pair of electrons. The application potential has led to the formation of series of novel Schiff base compounds with a wide range of physical, chemical and biological properties (Maurya et. al. 1993, Bassett
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89 - ASSAM U IVE N RSITY Assam University Journal of...

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