Abstract

Naorem Shubhaschandra Singh^1*, CH Shanti Devi², S Manimukta Devi² and W Harimati Devi³

DOI : http://dx.doi.org/10.13005/ojc/400411

Electronic spectral analysis of a tri-iodide solution in an acetic acid medium revealed the presence of strong absorption bands for tri-iodide at 287.5 and 351.5 nm. A notable shift in the absorption band to 310 nm indicated the formation of a complex between Chitosan and tri-iodide in an acidic medium solution. Chitosan-tri-iodide complex formation was significant at concentrations >0.5% (w/v). At lower concentrations, weak complexation is evident through the comparatively lower absorption of the iodophors. The introduction of KSCN to the polymer-iodophor system leads to a gradual reduction in absorption over time and is completed within 1 hour. If polymer mixtures of (1:1) ratio were used in iodophor, it persists as complex iodophor for a longer period. Photoluminescence investigations show sharp and narrow emission peaks at 350.5 and 701.5nm, highlighting unique fluorescent species alongside effective radiative recombination. It minimizes energy dissipation and suggests promising fluorescence applications across diverse fields.

Chitosan; Iodophore; polyvinyl pyrrolidone (PVP); polyvinyl alcohol (PVA); Photoluminescence spectra; UV-visible spectra

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