Photo Physical Properties of Sugar Derivatives with ICT Dye

Abstract

Photo physical techniques were employed to study hydrogen-bonding self-assemblies forming sugar derivatives interaction with 4-dicyanomethylene 2, 6-dimethyl-4H-pyran (DDP) dye in aqueous medium.  Hydrogen-bonding self-assemblies were investigated by addition of sugar derivatives to DDP dye which is an Intramolecular Charge Transfer (ICT) based fluorescent probe, results in a fluorescence enhancement accompanied with a shift towards the red region.    The coexistence of DDP dye with sugar derivatives signifies the presence of heterogeneous micro environment of DDP dye surrounded by varying proportion of the solute and water molecules around the dye moiety. sugar derivatives influence the excited state characteristics of DDP dye resulting in the formation and promotion of different distinguishable micro environment. The hydrophobicity of sugar derivatives along with the hydrogen-bonding properties of sugar -water and sugar - sugar largely influence the photo physical nature of DDP dye is emphasized.