Insights into the photophysics,protonation and Cu2+ ion coordination behaviour of anthracene-9,10-dione-based chemosensors |
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| Authors: | Navneet Kaur Subodh Kumar |
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| Institution: | 1. Department of Chemistry , Panjab University , Chandigarh, 160 014, Punjab, India neet_chem@yahoo.co.in;3. Department of Chemistry , Guru Nanak Dev University , Amritsar, 143 005, Punjab, India |
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| Abstract: | 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 (λmax 492 nm) shows multiple modes of complexation towards Cu2+. It is very much evident from the appearance of blue colour (λmax 615 nm) at pH >7.0 and yellow colour (λmax 465 nm) at pH < 4.0. In addition, chemosensor 3 exhibits a unique logic gate system that involves ‘INHIBIT’ and ‘TRANSFER’ logic gates. |
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| Keywords: | chromogenic sensor anthracene-9 10-dione stoichiometry stability constant pH logic gates |
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