Abstract
Difluoroboronate β-diketones, compounds 1 having the fluorene moiety and the phenyl groups as well as the ligating precursors of the corresponding β-diketones, compounds 2 were synthesized. The photophysical features of compounds 1 were investigated based on the measurements of fluorescence yields and lifetimes, and transient absorption. Compounds 1 are significantly fluorescent with quantum yields of ca. 0.95 in acetonitrile and ca. 0.90 in chloroform. Fluorescence from compounds 1 was observed also in the solid state. Observation of extremely weak triplet–triplet absorption spectra of compounds 1 verifies the large fluorescence quantum yields.
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