Photophysical Properties of Phenacylphenantridine Difluoroboranyls: Effect of Substituent and Double Benzannulation.

In this study we present a new series of phenantridine-based substituted difluoroboranyls. The effects of substitution and double benzannulation on their photophysical properties were examined with experimental techniques and compared with the results obtained for previously reported quinoline and isoquinoline derivatives. The experimental characterizations are supported by state-of-the-art quantum-chemical calculations.

The Influence of the π-Conjugated Spacer on Photophysical Properties of Difluoroboranyls Derived from Amides Carrying a Donor Group.

A series of difluoroboranyls derived from amides carrying a variable π-conjugated spacer between the electron-donating (D) and electron-accepting (A) groups was synthesized and characterized with (1)H, (11)B, (13)C, (15)N, and (19)F NMR, electronic absorption, fluorescence spectroscopies, and first-principle calculations. The D-to-A distance in the series varied from 1.5 to 4.