STUDY OF SOLVATOCHROMATIC, PHOTOLUMINESCENCE, ECTROCHEMICAL AND ANTIBACTERIAL PROPERTY OF A SODIUM VANILLIN POLYMERIC COMPLEX

Abstract

Solvatochromatic, electrochemical and photoluminescence properties of a sodium vanillin polymeric complex was studied in five different polar solvents like ethanol, methanol, DMF, DMSO and water. Solvatochromatic study show that due to the difference in the dielectric constant values of the solvent , the shifting of λ_max at  310 nm in the UV- visible spectra for n- Л^* transition of the complex in ethanol, DMF and DMSO is more than that obtained for the complex in water and methanol. Fluroscence emission spectra of the complex were taken which shows that excepting methanol, λ_max values of the polymeric complex in ethanol, DMF, DMSO and water shifted to the longer wave length with the increase in the polarity of the solvent which can stabilize the excited state of the polymeric complex. ΔE of the complex in different solvents were calculated from their respective E_pa and E_pc values of the complex obtained from respective voltamograms which indicates the highest reversibility of the complex in methanol because of the lowest calculated ΔE value. The calculated E_1/2 values of the polymeric complex in different solvents showed that the oxidizing power of the complex in ethanol and water is maximum as the E_1/2 values of the complex in those solvents are highest and equal. The ligand vanillin and its sodium complex  were tested against the bacteria E. coli and B. subtilis by using the disc diffusion method. Ampicillin was used as a standard. It was observed that the Na-Vanillin complex was more toxic than its parent ligand and the toxicity increased with increase in concentration of the solution of the test components.