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Coordinating properties of a pyrazole-derived carbohydrazide, a potential ligand of biological importance: Ni(II) complexes of neutral and deprotonated 5(3)-methylpyrazole-3(5)-carbohydrazide
N SAHA, K M DATTA
Published in -
1981
Volume: 43
   
Issue: 6
Pages: 1405 - 1410
Abstract
Ni(lI) complexes of 5(3)-methylpyrazole-3(5)-carbohydrazide (MPCH) and its deprotonated anion (MPC) have been isolated and characterised in the solid state. Magnetic and electronic spectral features classify both the bis-complexes Ni(MPCH)2X2.2H20 and the mono-chelates Ni(MPC)X.2H20[X = C1, Br, I, NO3, BF4, CIOa, SCN or 0.5SO4] as grossly octahedral ones. The IR spectra indicate that in the bis-derivatives the ligand is bidentate through the pyrazolyl-ring nitrogen and the ketonic oxygen of the hydrazide residue and that in the monochelates. the deprotonated ligand functions primarily as a (ONN) tridentate finally forming polymeric quasi-octahedral species through involvement of additional donor site (amide-nitrogen) of the hydrazide residue; the counterion (X) is coordinated in majority of the complex species.
About the journal
JournalJournal of Inorganic and Nuclear Chemistry
Publisher-
ISSN0022-1902