“…We have reported a number of metal complexes of Schiff bases derived from the condensation of salicylaldehyde and a biologically active primary amine. The structure of the presence Schiff base, has not been reported, but it is likely to exist as a zwitterion, 2-{[3-(1H-indol-3-yl)-propenyl]ammonio}phenolate as 2-{[3-(1H-Indol-3-yl)-propenyl]methyl-ammonio}phenolate, synthesized from 2-(indol-3-yl)ethylamine and 2-hydroxy-5-methylacetophenone, exists in this form (Ali et al, 2007a(Ali et al, , 2007b. The nickel derivative crystallizes from DMF as a disolvate (Scheme I,…”