Naked eye and fluorescent detections of Hg 2+ ions and Cysteine via J-aggregation and deaggregation of a perylene bisimide derivative

Hsiao Ping Fang, Muthaiah Shellaiah, Ashutosh Singh, Mandapati V.Ramakrishnam Raju, Yen Hsing Wu, Hong-Cheu Lin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

Selective naked eye and fluorescent sensor responses of a 1,6,7,12-tetra(4-tert-butylphenoxy)perylene-3,4:9,10-tetracarboxylic acid bisimide (PBI) derivative are reported for the first time toward Hg 2+ ions and Cysteine (Cys) via J-aggregation and deaggregation mechanisms. The J-aggregation and deaggregation of PBI induced by Hg 2+ and Cys were well established by UV-vis/PL and 1 H NMR titrations. The 1:1 stoichiometry of PBI-Hg 2+ and Cys-Hg 2+ /PBI ensembles were elucidated from the jobs plots based on their UV-vis spectral changes. The linear complex formation by PBI-Hg 2+ ensemble was confirmed through FT-IR and 1 H NMR spectral studies and well supported by its reversible nature upon the addition of pentamethyl diethylene triamine (PMDTA). The positive cooperativities of Hg 2+ and Cys (with PBI) in PBI-Hg 2+ and Cys-Hg 2+ /PBI ensembles were evidenced from the Hill plots based on their fluorescence binding isotherms. The detection limits of Hg 2+ ions and Cys were calculated as 36.6 and 91.3 nM, respectively, by standard deviations and linear fittings of their Stern-Volmer (K SV ) constants and relative fluorescence intensity changes, respectively. Furthermore, the sensor properties of PBI were well investigated by K SV constants, pH values, time effects, and time resolved photoluminescence (TRPL) spectra.

Original languageEnglish
Pages (from-to)229-237
Number of pages9
JournalSensors and Actuators, B: Chemical
Volume194
DOIs
StatePublished - 1 Apr 2014

Keywords

  • Hg mediated Cys sensor
  • J-Aggregation and deaggregation
  • Perylene bisimide
  • Reversible sensor
  • TRPL spectra

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