An azobenzene based
iminopyridine ligand 1 has been synthesized by a condensation
reaction between N,N-dimethyl-4,4′-azodianiline
and 2-formylpyridine. The complexation of the ligand with ZnCl2 afforded a tetrahedral neutral zinc metal complex (2) formulated as [(Azo-Imino-Py)ZnCl2]. The crystal
structure analysis of the complex indicates the formation of a tetracoordinated
zinc(II) ion with the expected tetrahedral geometry. In solid state,
a 2D supramolecular architecture reinforced by π–π
stacking and hydrogen bonding is observed. The UV–visible spectrophotometric
titration studies of the ligand, by increasing amount of ZnCl2, confirm the existence of single complex species in solution.
The nonlinear optical (NLO) investigations by Z-scan technique of
both ligand 1 and complex 2 indicate a dramatic
enhancement of the NLO absorption of the ligand upon complexation
with ZnCl2. This enhancement is likely to be due to a large
dipole moment found for the complex 2 as calculated by
DFT/B3LYP methodology.
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