作者: V. Sasirekha , M. Umadevi , V. Ramakrishnan
DOI: 10.1016/J.SAA.2007.03.021
关键词:
摘要: Abstract Preferential solvation of a solvatochromic probe has been studied in binary mixtures comprising non-protic and protic solvent. The solvents employed are carbon tetrachloride (CCl4), acetonitrile (AcN) N,N-dimethyl formamide (DMF) the methanol (MeOH) ethanol (EtOH). molecule exhibits different spectroscopic characteristics depending upon properties solubilizing media. observed spectral features provide an indication microenvironment immediately surrounding probe. Solvatochromic shifts ground excited states were analysed by monitoring charge transfer absorption band fluorescence emission spectra terms solute–solvent solvent–solvent interactions. Fluorescence show dual due to state proton nature molecule. effect solvent excitation energy on also studied. magnitude Stokes shift above used deduce experimentally dipole moment ratio for state. is higher than