An Efficient Fluorescence "Turn-On" Chemosensor Comprising of Coumarin and Rhodamine Moieties for Al3+ and Hg2+

作者：Acharyya Samik; Gharami Saswati; Patra Lakshman; Mondal Tapan Kumar^*

来源：Journal of Fluorescence, 2017, 27(6): 2051-2057.

DOI：10.1007/s10895-017-2144-9

• Fluorescence turn-on sensor
• Rhodamine-coumarin based chemosensor
• Detection of Hg2+ and Al3+
• DFT calculation

A potent fluorescence 'turn-on' receptor (HL) based on rhodamine and coumarin moieties for the detection of Hg2+ and Al3+ is synthesized by condensation of rhodamine 6G hydrazide and 4-hydroxy-3-acetylcoumarin. In presence of Al3+ and/or Hg2+ the receptor (HL) exhibits deep pink colouration and a sharp band at 528 nm is appeared in UV-vis titration. Upon gradual addition of Al3+ and/or Hg2+ to the solution of HL significant enhancement of fluorescence intensity is observed at 564 nm in MeCN:H2O (1:5, v/v) medium. The receptor is strongly bound to Al3+ and/or Hg2+ and the association constants (K-a) are found to be 1.74 x 10(4) and 1.04 x 10(4) M- 1 for Al3+ and Hg2+ respectively.

• 出版日期2017-11