期刊
TETRAHEDRON LETTERS
卷 55, 期 43, 页码 5988-5992出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2014.09.051
关键词
Fluorescein; Chemodosimeter; Fluoride ion; Nucleophilicity/basicity; Optical sensors
资金
- CSIR, New Delhi
- UPE-JRF
- UGC, New Delhi [F.4-2/2006(BSR)/13-398/2011(BSR)]
A new reaction based probe fluorescein nosylate (R1) has been designed and synthesized for selective recognition of F- in acetonitrile (CH3CN) by exploiting both its nucleophilic and basic character. Probe R1 consists of fluorescein dye as a signalling unit while 4-nitrobenzenesulfonyl chloride as the masking unit. The F- plays the role of de-masking agent to set free the fluorescein moiety in its open form from R1 leading to significant changes in its absorption/emission profile. The detection of F- amidst of sulfide/thiols through receptors undergoing nucleophilic scission is a tedious job due to similarity in their extent of basicity/nucleophilicity. Here, we present a convenient solution for the same in the form of R1 which detects F- selectively over sulfide/thiols in CH3CN with a high detection limit of 4.6 x 10(-7) M and 2.75 x 10(-8) M determined through UV-visible and fluorescence titration data, respectively. (C) 2014 Elsevier Ltd. All rights reserved.
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