名称:
                                Insights into the photophysics, protonation and Cu2+ion coordination behaviour of anthracene-9,10-dione-based chemosensors
                             
                            
                                摘要:
                                Carboxylic acid-diamine-based Cu2+ chromogenic sensors (3 and 4) exhibited colour switching from red to blue with good sensitivity and selectivity towards Cu2+ among other physiologically important alkali, alkaline earth and heavy metal ions. This colour-switching phenomenon arises due to selective deprotonation of aryl amine NH by Cu2+. Significantly, chemosensor 3 (lambda(max) 492 nm) shows multiple modes of complexation towards Cu2+. It is very much evident from the appearance of blue colour (lambda(max) 615 nm) at pH > 7.0 and yellow colour (lambda(max) 465 nm) at pH < 4.0. In addition, chemosensor 3 exhibits a unique logic gate system that involves 'INHIBIT' and 'TRANSFER' logic gates.