K. Nakashima, Y. Fukuzaki, R. Nomura
Jul 15, 1998
Citations
0
Influential Citations
38
Citations
Journal
Dyes and Pigments
Abstract
Abstract The fluorescence and chemiluminescence properties of lophine analogues, viz. 2-substituted-4,5-di(2-pyridyl)imidazole, 2-substituted-4,5-di(2-furyl)imidazole and 2-substituted- 4(or 5)-(4-dimethylaminophenyl)-5(or 4)-phenylimidazole, were examined and compared with those of lophine (2,4,5-triphenylimidazole). The fluorescence excitation and emission maxima of the derivatives were at 310–370 nm and 385–565 nm, respectively, in methanol. The compounds carrying a 2-furyl group showed strong fluorescence intensities, while those having 2-pyridyl group gave very weak intensities. The chemiluminescence intensities obtained by the flow-injection method showed that 4-[4(or 5)-(4-dimethylaminophenyl)-5(or 4)phenyl-1H-imidazol-2-yl]benzoyl chloride ( 3i ) has the largest intensity; about 40% of that of lophine. 2-(4-Methoxyphenyl)-4,5-di(2-furyl)imidazole ( 2b ) and 2-(4-methylphenyl)-4,5-di(2-furyl)imidazole ( 2d ) also gave stronger chemiluminescence intensities. Compounds having 2-pyridyl group showed very weak chemiluminescence intensities which were 0.1–0.3% of that of lophine. Chemiluminescence spectra of some compounds which showed relatively large intensities were measured and the wavelengths of the emission maxima were found to be 530–540 nm.