Synthesis and Spectroscopic Properties of 2-(7-Fluoro-1H-Imidazo[4,5-B]phenazin-2-Yl)-Phenol Derivatives
A convenient method to synthesize 2-(7-fluoro-1H-imidazo[4,5-b]phenazin-2-yl)- phenol derivatives 3a-d with substitute (s) X (X = H, CH2OH, Br, Cl) via the reaction of 7-fluoro- phenazine-2,3-diamine and bisulfite addition products of 2-hydroxy aromatic aldehydes in DMF solution with a yield of 80-85% was developed. Meanwhile, the ultraviolet absorption and the fluorescent spectra of these o-hydroxy derivatives of 1H-imidazo[4,5-b] phenazin were measured in methanol and one fluorescence band with a peak wavelength of 550nm with a Stokes shift around 134-141 nm for 3a-d was observed.
Jinglong Bu, Pengcheng Wang, Liqun Ai, Xiaoming Sang, Yungang Li
Y. J. Lei et al., "Synthesis and Spectroscopic Properties of 2-(7-Fluoro-1H-Imidazo[4,5-B]phenazin-2-Yl)-Phenol Derivatives", Advanced Materials Research, Vols. 287-290, pp. 2057-2060, 2011