Design and synthesis of fluorescent 6-aryl[1,2-c]quinazolines serving as selective and sensitive ‘on-off’ chemosensor for Hg2+ in aqueous media
作者:Rampal Pandey、Mahendra Yadav、Mohammad Shahid、Arvind Misra、Daya Shankar Pandey
DOI:10.1016/j.tetlet.2012.04.128
日期:2012.7
Three fluorescent quinazolines thiophen-2-yl-5,6-dihydrobenzo-[4,5]imidazo[1,2-c]quinazoline (1), Pyridin-3-yl-5,6-dihydrobenzo-[4,5]imidazo-[1,2-c]quinazoline (2) and phenyl-5,5',6,6'-dihydrobenzo-[4,4',5,5']imidazo-[1.1',2-c,2'-c]quinazoline (3) have been synthesized. Structures of 1 and 3 have been authenticated crystallographically. Quinazolines 1-3 exhibit highly selective 'on-off' switching for Hg2+ ions. The fluorescence intensity displayed a linear relationship with respect to Hg2+ concentration (0.1-1.0 mu M; R-2 = 0.99) with detection limit of 2.0 x 10(-7) M. (C) 2012 Elsevier Ltd. All rights reserved.