The syntheses and photochemical properties of the novel aminoaryldiarylbora
nes, 4, which are isoelectronic with triarylmethane dyes, and also pyrrolyl
- 8, and indolyl-diarylboranes 11, are described. The fluorescence spectra
are strongly dependent on the solvent. The use of o-disubstituted arenes as
stabilizing substituents at the boron atom leads to highly coloured solids
which are stable to air and moisture. The structures of the triarylboranes
4a and b were confirmed by X-ray analyses.