Lu ZN, Wang L, Zhang X, Zhu ZJ. A selective fluorescent chemosensor for Cd
2+ based on 8-hydroxylquinoline-benzothiazole conjugate and imaging application.
SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019;
213:57-63. [PMID:
30682647 DOI:
10.1016/j.saa.2019.01.041]
[Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Revised: 11/27/2018] [Accepted: 01/15/2019] [Indexed: 06/09/2023]
Abstract
A 8-hydroxylquinoline-benzothiazole conjugate (HQ-BT) was facilely synthesized by two steps with >60% total reaction yield. The HQ-BT showed a weak fluorescence that could be strongly enhanced by coordination with various metal ions such as Al3+, Cd2+, Zn2+ in methanol containing 1% water. Interestingly, the selectivity toward Cd2+ was achieved by increasing water fraction to 30% aqueous methanol solution. Thus, the HQ-BT was developed as a new and selective fluorescent chemosensor for Cd2+ in aqueous solution with a broad pH region 4-12. A good linear relationship between the fluorescence intensity and the Cd2+ concentration was found in the range of 0-5 μM with a detection limit of 0.1 μM (S/N = 3). It was also succesfully used for fluorescence imaging of Cd2+ in living cells.
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