Dynamics of Photodissociation and Rearrangement of Chemical Bonds in Solution

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l. Photodissociation of Heterodimers of Anthracene and 1, 4-Dihalobebzens in SolutionWhen a heterodimer is excited in solution, a excited singlet state of anthracene and a ground state of dihalobenzene are produced from the excited singlet state of the heterodimer. We have measured the time-dependence of the fluorescence of heterodimer itself and produced anthracene as well as the time-resolved transient absorption spectra in solution by means of a picosecond laser spectroscopy.The fluorescence spectrum of anthracene observed by the excitation of heteroexcimer in glass matrix at 77K is shifted to the red about 10nm compared to that of free anthracene, which indicate that a special intermolecular conformation between anthracene and dihalobenzene may be preserved in the low temperature matrix. Dynamical shifts of anthracene fluorescence were detected at room temperature in viscous solvent, cis-decalin.2. Photodissociation of Tetraphenylhydrazine and Its Derivatives in SolutionThe slow N-N bond rupture occurring in the fluorescence state of tetraarylhydrazines has been confirmed by a picosecond time-resolved spectroscopy. The predissociation mechanism from the excited singlet (fluorescent) state to the lower lying dissociative state was proposed.