The synthesis and physiochemical characterisation of a series of four reported zinc complexes with substituted N,N- donor ligands, viz. Ln = (E)-N-(pyridin-2-ylmethylene) anilines with compositions [Zn(NO3)2(L1)](1), [Zn(NO3)2L2] (2), [Zn(NO3)2L3] (3), and [Zn(NO3)2L4] are highlighted in this (4). UV-visible, fluorescence, IR, and 1H NMR spectral analyses were used to investigate the complexes’ spectroscopic properties. In solution, all of the complexes were water soluble and non-electrolytes. It was impossible to obtain single crystals sufficient for X-ray crystal structure analysis to identify the geometry and structure of the complexes. All of the complexes were predicted to have octahedral geometry (1-4) based on spectrum investigations and comparable Zinc(II) nitrate compounds previously reported. Monodentate (1) or bidentate (2-4) coordination of the nitrate ion to zinc complexes. All of the complexes had a (pi)-(pi)* (intra-ligand) transition in their emission spectra, and Zn compounds had a very low fluorescence quantum yield, indicating that they were weak emitters at ambient temperature.
Department of Chemistry, National Institute of Technology Agartala, Jirania, 799 046, India.
Keisham Surjit Singh,
Department of Chemistry, Manipur University, Canchipur, 795003, India.
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