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A water-soluble BODIPY based ‘OFF/ON’ fluorescent probe for the detection of Cd2+ ions with high selectivity and sensitivity.
- Source :
- Dalton Transactions: An International Journal of Inorganic Chemistry; 2/14/2019, Vol. 48 Issue 6, p2108-2117, 10p
- Publication Year :
- 2019
-
Abstract
- A water-soluble dilithium salt BODIPY derivative (LiBDP) with appended dicarboxylate pseudo-crown ether [NO<subscript>4</subscript>] coordinating sites has been designed, synthesized and characterized successfully for the selective and sensitive recognition of Cd<superscript>2+</superscript> in aqueous media. The chemosensor exhibits a remarkable increase in fluorescence intensity as well as a distinct color change upon the addition of Cd<superscript>2+</superscript> over other environmentally and biologically relevant metal ions in H<subscript>2</subscript>O. The fluorometric response of LiBDP is attributed to the metal chelation-enhanced fluorescence (MCHEF) effect which has been confirmed by a strong association constant of 2.57 ± 1.06 × 10<superscript>5</superscript> M<superscript>−1</superscript> and Job's plot, indicating 1 : 1 binding stoichiometry between LiBDP and Cd<superscript>2+</superscript>. Frontier molecular orbital analysis (obtained from DFT studies) also illustrates the turn-on fluorescence of the probe by blocking photoinduced electron transfer (PET) after coordination to Cd<superscript>2+</superscript>. The probe can detect Cd<superscript>2+</superscript> in a competitive environment up to a submicromolar level in a biologically significant pH range. The sensor is proved to be reversible and reusable by the alternative addition of Cd<superscript>2+</superscript> followed by S<superscript>2−</superscript>. The OFF/ON/OFF sensing behavior is utilized to construct an INHIBIT molecular logic gate based on the two inputs of Cd<superscript>2+</superscript> and S<superscript>2−</superscript> and a fluorescence intensity at 512 nm as an output. The test paper experiment demonstrates the practical utility of LiBDP to monitor Cd<superscript>2+</superscript> in an aqueous sample. Finally, the sensing probe was utilized to monitor Cd<superscript>2+</superscript> in living cells. [ABSTRACT FROM AUTHOR]
- Subjects :
- HYDROPHILIC compounds
FLUORESCENT probes
CADMIUM compounds
Subjects
Details
- Language :
- English
- ISSN :
- 14779226
- Volume :
- 48
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Dalton Transactions: An International Journal of Inorganic Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 134540074
- Full Text :
- https://doi.org/10.1039/c8dt04016h