Picosecond kinetics of p-dimethylaminobenzonitrile

D. Huppert*, S. D. Rand, P. M. Rentzepis, P. F. Barbara, W. S. Struve, Z. R. Grabowski

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The nanosecond and picosecond resolved dual fluorescences of p-dimethylaminobenzonitrile (DAB), in various solvents and glasses excited by 266 nm 20 ps FWHM laser pulses, have been investigated. Pulse-limited rise times are exhibited by the b*-state emission whose decay in turn feeds directly the risetime of a*-state emission at 440-600 nm in most solvents studied. The a*-state emission was monitored at 520-600 nm in order to eliminate contribution from the b*-state. Within the experimental resolution, the b*-state fluorescence decay times vary approximately linearly with solvent viscosity. The a*-state fluorescence decay times vary with both solvent and temperature, and may reflect either thermally assisted intersystem crossing from the solvated singlet a*-state (presumably of twisted internal charge transfer character) to a corresponding solvated triplet of slightly higher energy, or a thermally activated internal conversion of the 1TICT to the ground state.

Original languageEnglish
Pages (from-to)5714-5719
Number of pages6
JournalThe Journal of Chemical Physics
Issue number12
StatePublished - 1981


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