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Anion-induced ring-opening of fluorescein spirolactam:: fluorescent OFF-ON

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TETRAHEDRON LETTERS
卷 48, 期 18, 页码 3159-3162

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PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2007.03.060

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N-(2,7-Dichlorofluorescein)lactam-N'-phenylthiourea (L) was developed as a colorimetric and fluorescent chemosensor for anions such as AcO-, F- and H,2PO4-. The addition of AcO- anion to the solution of L in CH3CN results in a distinct fluorescence 'ON' observation as well as color change (from colorless to pink). The H-bonding interaction between AcO- anion and thiourea moiety of L induced the ring-opening of the spirolactam of fluorescein moiety, which gave rise to the dual chromo- and fluorogenic changes. (c) 2007 Elsevier Ltd. All rights reserved.

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