Synthesis and Fluorescence Properties of Pyrimidine Mono- and Bisboron Complexes

Novel
fluorescent mono- and bisboron complexes based on pyrimidine
bearing β-iminoenolate ligands were synthesized, and their fluorescence
properties were investigated. The nonsubstituted and trifluoromethyl-substituted
monoboron complexes showed higher fluorescence quantum yield in solid
state than in solution. The dimethylamino derivative of the monoboron
complex exhibited positive solvatochromism in the fluorescence spectra.
The bisboron complex showed significantly higher molar absorption
coefficient and red-shifted maximum absorption and maximum fluorescence
wavelengths than the corresponding monoboron complex.