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Steady-State and Time-Resolved Fluorescence Studies Of Polar Molecule

Nadaf. Y. F, Renuka. C.G

The photophysical properties of laser dye molecule (C6) were investigated in various solvents using steady-state and time-resolved fluorescence techniques. Fluorescence peak was observed in various solvents of different polarity function. The emission band observed at 500 nm and absorption band at 457 nm at lower concentrations. Solvatochromic shifts of absorption and fluorescence emission as a function of solvent polarity were analysed and the change in dipole moment of the molecule was observed.The Steady-state and timeresolved fluorescence of molecules in various solvents has been investigated. Time-resolved fluorescence anisotropy measurements show that the rotational dynamics of the probe becomes faster in alcohol. A comparison of the experimentally measured rotational reorientationtimes of coumarin in a given solvents at a particular temperature. The present study has been undertaken to examine the role of polarity, friction experienced by the polar solute in a polar and non-polar solvents. Molecular shape and size are similar but the friction experienced by these probes in alkane and alcohol solvents viscosities were varies by temperature. However, it was observed that molecules rotate faster in alkanethan alcohol.