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Conformational difference of free and coordinated ligand in N-(2-bipyridyl)-2-oxy-1-naphthaldimine and its Ni(II) complex

A lot of collected structural data of different N-substituted 2-OH-salicylaldimines and their metal complexes provided the explanation for keto-enol tautomerism, the molceular geometry variations upon the coordination as well as the coordination mode for the metal complexes. In the case od salicylaldimines the enol tautomer is showed to be dominant form , but there is an exceptional tendency in 2-OH- naphthaldimine derivatives to be the keto tautomer in the solid state. Although the significant changes take place in the chelate bite distance and the N-substituent spatial orientation upon the coordination to the metal atom, there are no variations in the naphthalene crystallographic D2h bond length pattern.

N-(2-bipyridyl)-2-oxy-1-naphthaldimine; nickel(II) complexe; tautomerism

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