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Title: Metal chelates of bioinorganic and catalytic relevance: Synthesis, magnetic and spectral studies of some mononuclear and binuclear oxovanadium(IV) and dioxotungsten(VI) complexes involving Schiff bases derived from 4-butyryl-3- methyl-1-phenyl-2-pyrazolin-5-one and certain aromatic amines
Authors: Maurya, R C
Singh, H
Pandey, A
Singh, T.
Issue Date: Oct-2001
Publisher: NISCAIR-CSIR, India
Abstract: Synthesis of two series of metal chelates: (i) mononuclear chelates of compositions, [VO(L1)2].H2O and [WO2(SCN)(C2H5OH)2(L1)], (where L1 H = N-(4'-butyrylidene-3’-methyl-1'-phenyl-2'-pyrazolin-5'-one)-p-anisidine(BUMPHP-PAH, I), N-(4’-butyrylidene- 3'-methyl-1 '-pheny l-2'-pyrazolin-5' -one)-o-phenitidine (BUMPHP-OPH, II), N(4' -butyrylidene-3' -methyl-1' -phenyl-2' -pyrazolin-5' -one)-m-phenetidine (BUMPHP-MPH, II I) or N-(4' -butyrylidene-3'methyl- 1' -phenyl-2' -pyrazolin-5' -one)-III-toluidine (B UMPHP-MTH, IV) or N-(4' -butyrylidene-3 ' -methyl-1' -phenyl-2'pyrazolin-5'-one)-p-tolui dine (BUMPHP-PTH V), [VO(L2)].H2O, and [WO2(SCN)(L2H)] (where L2H2 = N,N'-bis-(4'-butyrylidene-3' -methyl-1' -phenyl-2' -pyrazolin-5'-one)-o-phenylenediamine (BUMPHP-OPHDH2, VI) or N,N'-bis-(4'-butyrylidene-3' -methyl-1' -phenyl-2' -pyrazolin-5'-one)-m-phenylenediamine (BMPHP-MPHDH2, VII) and VO(L2')(H2O)] (where L2' H2 N,N'-bis-(4'-butyrylidene-3' -methyl-1' -phenyl-2' -pyrazolin-5'-one)-o-phenylenediamine (BMPHP-MPHDH2, VII), and (ii) binuclear chelates of compositions, [{VO(H2O)(OH)}2 (L3)] and [{WO2(SCN)(H2O)}2 (L3) ], where L3H2 = N ,N' -bis-(4-butyrylidene-3-methyl-1-phenyl-2-pyrazolin-5-one)-p-phenylenediamine (BMPHP-PPHDH2, VIII ) or N,N'-bis-(4-butyrylidene-3-methyl-l-phenyl-2-pyrazolin-5-one)-benzidine (BMPHP-BZH2, IX) are described. The resulting chelates have been characterized by elemental analyses, molar conductance, decomposition temperature and magnetic measurements, electron spin resonance/ 1H-NMR, infrared and electronic spectral studies. The oxovanadium(IV) compounds with ligands, BUMPHP-PPHDH2 and BUMPHP-BZH2 exhibit subnormal magnetic moments. Structures involving ... V=O··· V=O··· chain for oxovanadium(IV) complexes, and tentative structures involving cis-WO2 have been proposed for dioxotungsten(VI) complexes.
Page(s): 1053-1063
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.40A(10) [October 2001]

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