Abstract

V. B. Rana*, V. K. Chauhan, D. P. Singh and M. P. Teotia

Picolinic acid hydrazide (PH) and Isonicotinic acid hydrazides (INH) react with acetylacet to give rise to complexes of tetradentate ligands Ac(PH)2 or Ac(INH)2 in the presence of oxoura-nhim, hydroxozirconium and oxovanadium salts. The complexes are isolated and characterised on the basis of electronic, infra-red and e. s. r, spectral data. Oxouranium cation (UO22+) remains as such during, the reaction while oxozirconium (ZrO2+) is converted into Zr4+species. The ligand Ac(PH)2 coordinates through pyridine and azomethine nitrogens, while Ac(INH)2 does so through azomethine nitrogens and amide oxygens and yield complexes of the type [UO 2 (L)] X, [Zr(OH)2 L]X andlVO(L) X] where L is Ac(PH)2 or Ac(INH)2 and X=CI, for oxouranium and hydroxozrrconiua and X=C1, Br NO3, NCS for oxovanadium complexes. The electronic and E. S. R. spectra are consistent with the proposed geometry of the complexes. Various metal-ligand vibrations are discussed.

Hydroxozirconium; Oxovanadium; Ligands

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