There has been acontinuing interest in the coordination chemistry of thiosemicarbazones particularly on tridentate compounds containing a donor atom,besides the thiosemicarbazone moiety,azomethine nitrogen aand thione/thiol sulfur atoms(1,2)
An impor-tant feature in the chemistry of the 2NH;this allows for either neutral or anionic ligands
When coordinated as anionic ligands,the conjugation is extended to include the thiosemicarbazone moi-ety
It has been proposed that this conju-hation system enhanced biological activity of these compounds(3)
We have previously reported structural and spectral studies of the mono and binuclear transitionmatal complexes of N(4) -substituted thiosemicarbazones(4-8)
One of the most remarkable facts about the stereochemistry of Ni(II) complexes is that equilib-rium between different structural types exist in solution and these equilibria are temperature dependent also
Nickel atom present in the active sites of several dehydrogenases and the chemisthy of divalent and trivalent nickel complexes with nitrogen-sulfur do-nor ligands have received much attention(9,10)
There is currently intense interest in dinickel thiolate-bridged complexes as first-generation models for the active site in Ni,Fe hydrogenases,yet only a handful of such complexes have been isolated and fully characterized(11)
Here we report the synthesis and crystal structure of new binuclear Ni(II) complex of salicylaldehyde 3-aza-cyclothiosemicarbazone ligand