Activation of – N=CH – bond in a Schiff base by divalent nickel monitored by NMR evidence |
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| Authors: | M Chandrakala N M Nanje Gowda K G S Murthy K R Nagasundara |
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| Institution: | 1. Postgraduate Department of Chemistry, V. V. Pura College of Science, , Bangalore, India;2. Department of Chemistry, Central College Campus, Bangalore University, , Bangalore, India |
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| Abstract: | The Schiff base, 2–salicylidene–4–aminophenyl benzimidazole in ethanol undergoes activation of –N=CH– bond by Ni2+ in the presence of ammonia or primary alkyl amine to produce nickel complexes of the formula Ni{o–C6H4(O)CH NR}2 . n H2O R = H, Me; n = 0; R = Et, n = 0.5] and 4–aminophenyl benzimidazole. The products have been identified by elemental analysis, magnetic susceptibility measurements and IR, ESR, mass and extensive NMR spectral studies. The possible mechanism for the activation of –N=CH – bond has also been proposed. Copyright © 2012 John Wiley & Sons, Ltd. |
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| Keywords: | Ni (II)‐Schiff base complexes 2– salicylidene– 4– aminophenyl benzimidazole NMR 1H 4Q‐SQ correlation spectroscopy ESR magnetic susceptibility |
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