• Dr Raman Kumar

Studies on coordination chemistry of Ni(II) and Cu(II) are fast gaining importance due to its enormous organometallic and catalytic chemistry. The complexes of Ni(II) and Cu(II) with bidentate ligand 2,-bis(α-imino aceto hydroxamic acid) Butana, LH2 derived from the reaction between Butane-2,3-dione and α-amino acetohydroxamic acid in alcoholic medium have been synthesized and characterized on the basis of elemental analyses, magnetic susceptibility, infrared, electronic spectral and conductivity data. The metal chelates ligand have general formula [M(L)(B)2].The IR observations suggest that the ligands have two proton of the hydroxamic acid moiety, one from each (N-O-H) group are lost producing binegative ion. The resulting ligand, LH2 act as bianionic tetradentate 4-nitrogen atoms of the macrocyclic ligand shifts 4- coordinations in planar framework. In which coordination occurs through equatorial mode of two Carbonylimido nitrogen and two imine nitrogen atoms with central metal ion while remaining centers of the central metal ion are satisfied by two axial coordinated molecules such as water, ammonia, quinoline, phenyl isocyanide etc. are in facial and perpendicular mode of one another. But two hydroxyl group of the hydroxamic acid combine to one another by Intramolecular hydrogen bond and formed six members chelating ring structure while imine group forming five members chelating ring with central metal ion above and below in a layer lattice complexes structure. Which both are enhancing the extra stability of the complexes. During the course of present investigation of magnetic susceptibility along with electronic and IR spectral data Indicates distorted high spin, paramagnetic Octahedral structure for the Ni(II) and Cu(II) complexes. The electrical conductance of the complexes show that these are to be non-electrolyte in nature while elemental analysis of the complexes indicate that the complexes are monomeric in nature. The stability of the macrocyclic complexes have been found to be dependent on the ring size of the cavity of the macrocyclic ligands which can be varied by changing the number of intervening atoms between two N atom of hydroxamic acid moiety and size of alkyl groups present in the terminal and intramolecular hydrogen bonding. *Lecturer in Chemistry, Sanjay Gandhi Inter College, Nagra, Chapra.

"Spectral and magnetic studies of co-ordination compounds of Ni(II) and Cu(II) with polydentate hydroxamic acid.", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.7, Issue 5, page no.1103-1111, May-2020, Available :http://www.jetir.org/papers/JETIR2005467.pdf

"Spectral and magnetic studies of co-ordination compounds of Ni(II) and Cu(II) with polydentate hydroxamic acid.", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.7, Issue 5, page no. pp1103-1111, May-2020, Available at : http://www.jetir.org/papers/JETIR2005467.pdf