Synthesis, structure and spectral study of two types of novel fluorescent BF2 complexes with heterocyclic 1,3-enaminoketone ligands

Two types of novel BF2 complexes are readily obtained by the reaction of BF3OEt with 3-(2-oxo-2-arylethylidene)-3,4-dihydro-1H-quinoxalin-2-ones or 3-(2-oxo-2-arylethylidene)-3,4-dihydrobenzo[1,4]oxazin-2-ones, respectively in refluxing acetic acid/toluene solvent mixture. The complexes are confirmed by elemental analysis, FT-IR, 1H, 13C, 11B, 19F NMR and one of them is executed its X-ray crystallographic study. The outstanding photophysical properties of these complexes are determined by UV–vis absorption and fluorescence emission spectroscopy.

Graphical abstractTwo novel types of complexes with remarkable fluorescence can be readily prepared by reaction of BF3OEt with 3-(2-oxo-2-arylethylidene)-3,4-dihydro-1H-quinoxalin-2-ones or 3-(2-oxo-2-arylethylidene)-3,4-dihydro-benzo[1,4]oxazin-2-ones in refluxing acetic acid/toluene.Figure optionsDownload full-size imageDownload as PowerPoint slide