SYNTHESIS AND CHARACTERIZATION OF SOME OXOCATION(IV) COORDINATION-COMPOUNDS OF SCHIFF-BASES DERIVED FROM 4-AMINO ANTIPYRINE

The reaction of oxozirconium (IV) chloride with 4[N-(2'-nitrobenzalide ne) amino] antipyrine (2'-NO2BAAP), 4[N-(3'-nitrobenzalidene) amino] a ntipyrine (3'-NO2BAAP), 4[N-(benzalidene) amino] antipyrine thiosemica rbazone (BAAFT), 4[N-dimethyl amino-benzalidene) amino] antipyrine thi osemicarbazone (DABAAPT), 4[N-(4-methoxybenzalidene)amino] antipyrine thiosemicarbazone(MBAAPT) and 4[N-(4-hydroxy-3-methoxy-benzalidene)ami no] antipyrine thiosemicarbazone (HMBAAPT) and with oxovanadium (IV) s alts with BAAPT and DABAAPT resulted in the formation of ZrOCL2.2 L H2 O (L = 2'-NO2BAAP, 3'-NO2BAAP, BAAPT, DABAAPT, MBAAPT or HMBAAPT and V OX2.L nH2O (X=Cl, Br, 1, NO3 or NCS, n = 0; X = C]04, n = 1; L = BAAPT or DABAAPT) respectively. The structure of the complexes were assigne d on the basis of elemental analyses, conductivity, molecular weight, magnetic moment, infrared and electronic spectral data. I. R. spectral data suggest the bidentate nature (N, 0) of 2'-NO2BAAP and 3'-NO2BAAP , while the thiosemcarbazones behave as tridentate. (N, N, S) ligands. The probable coordination number of zirconium is either six or eight and of vanadium is five. Thermal properties of the compounds have been investigated through thermogravimetric analysis.