4-chlorobenzoylacetone difluoroboron;difluoroboron chelate of 4-chlorobenzoylacetone;4-(4-Chlorophenyl)-2,2-difluoro-6-methyl-1-oxa-3-oxonia-2-boranuidacyclohexa-3,5-diene
Synthesis of 3-arylazo-1H-pyridazin-4-ones from difluoroboron chelates of 1,3-diketones
作者:I. V. Kravtsov、P. A. Belyakov、S. V. Baranin、V. A. Dorokhov
DOI:10.1007/s11172-007-0243-5
日期:2007.8
A convenient method for the synthesis of 6-R-3-arylazo-1H-pyridazin-4-ones from difluoroboron chelates of acetylacetone and aroylacetones was developed. The method is based on the ability of the methyl group of the chelates to react with two equivalents of a diazonium salt.
We investigate the heavy atom effect on difluoroboron(III) β-diketonate (BF2bdk) luminescent compounds. The iodine-substituted BF2bdk powders with 38 wt% iodine substituents show insignificant afterglow at 77 K. Unexpectedly, when doped into phenyl benzoate matrices, the iodine-substituted BF2bdk exhibits bright room-temperature phosphorescence with lifetimes of up to 1.0 s under ambient conditions