Session: Physical Organic Chemistry: Calculations, Mechanisms, Photochemistry & High-Energy Species:

Fluorenone and benzoflurenone dyes exhibit solvatotochromic shifts in both their absorption and emission spectra. These shifts and relative emission intensities are predicted to be the result of an interplay between the single and triplet manifolds. In this study we report experimental testing of the theoretical predictions on the excited-state ordering in benzo[c]fluorenone in polar, aprotic solvents. Steady-state and time-resolved fluorescence and time-resolved transient absorption spectroscopic techniques were used to probe the relevant excited states. Experimental findings support the predicted theoretical excited-state ordering.

Nanosecond transient absorption spectra of benzo[c]fluorenone in cyclohexane

Nanosecond transient absorption spectra of benzo[c]fluorenone in cyclohexane

Nicole Karn

The Ohio State University

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