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Excited state dynamics of Michler's ketone: a laser flash photolysis study

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Steady state absorption and fluorescence as well as the time resolved absorption studies in the pico and subpicosecond time domain have been performed to characterize the excited singlet and triplet states of Michler's ketone (MK). The nature of the lowest excited singlet (S1) and triplet (T1) states depends on the polarity of the solvent - in nonpolar solvents they have either pure nπ * character or mixed character of nπ * and ππ * states but in more polar solvents the states have CT character. Concentration dependence of the shapes of the fluorescence as well the excited singlet and triplet absorption spectra provide the evidence for the association of the MK molecules in the ground state.

Affiliations: 1: Radiation Chemistry & Chemical Dynamics Division, Chemistry Group, Bhabha Atomic Research Centre, Mumbai-400 085, India; 2: Chemical Dynamics Division, Chemistry Group, Bhabha Atomic Research Centre, Mumbai-400 085, India


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