Synthesis and characterisation of the reaction products from bis(thiosalicylohydrazidato)nickel(II) in base and acid solution
- 1 January 1981
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 11,p. 2176-2182
- https://doi.org/10.1039/dt9810002176
Abstract
Bis(thiosalicylohydrazidato)nickel(II), [Ni(HL)2](1) transforms to [NiLL′] on reacting with nucleophiles (L′) in the presence of ethanolic K[OH], where H2L = thiosalicylohydrazide, o-HOC6H4C(S)NaHNbH2, and L′= H2O, NEt3, pyridine, 2-methylpyridine, 2,6-dimethylpyridine, 2,2′-bipyridyl (bipy), 1,10-phenanthroline (phen), propane-1,3-diamine, or NN′-diethylethylenediamine. But, in contrast, with ethylenediamine (en), complex (1) transforms to [Ni2L2(en)] where en bridges two metal ions through the terminal nitrogen atoms. In [NiLL′], thiosalicylohydrazide acts as a dibasic tridentate ligand and co-ordinates through (O,NbS) sites. Complex (1) reacts with acetone to form bis(acetone thiosalicylhydrazonato)nickel(II) and also forms an adduct with dimethyl sulphoxide in acidic medium. In both these cases the bonding sites (Na,O) observed in the parent species (1) change to (S,Nb) on reaction. In [Ni(H2L)2]Cl2·5H2O and [Ni(H2L)2][HSO4]2·2H2O however, formed by treatment of (1) with mineral acid, no alteration of the bonding sites takes place. All the complexes, except [NiL(bipy)] and [NiL(phen)] which possess high-spin five-co-ordinate geometry, are square planar. All the reaction products are characterised by elemental analyses, magnetic moments, conductance, and spectral (1H n.m.r., i.r., far-i.r., and electronic) data.Keywords
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