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A Novel Multimode Sensor Showing Cation-Dependent Fluorescence Colour

Abstract

A novel sensor, 4-[2-(9-anthryl)ethynyl]-1,10-phenanthroline (1), exhibits highly intense fluorescence in the wavelength region of 440 – 600 nm (maximum wavelength (λf) = 470 nm) with the quantum yield (Φf) and lifetime (τf) being 0.90 and 4.2 ns, respectively, in CH3CN at 298 K. In the presence of a divalent cation (M2+ = Ba2+, Ca2+, Mg2+, or Zn2+) in CH3CN, the sensor 1 can tightly bind M2+ and shows intense fluorescence (Φf = 0.90 – 0.19, τf = 2.1 – 6.9 ns) with the color being dependent on the nature of M2+ (λf = 514 – 584 nm). The results demonstrate that a single fluorescence sensor 1 is capable of simultaneous identification and quantitation of M2+ based on λf and the fluorescence intensity (Φf), respectively. The fluorescence maximum energy of the [1 – M2+] complex is shown to correlate linearly with the pKa value of M2+. The spectroscopic and photophysical properties of the sensor 1 in the absence and presence of M2+ are also discussed.

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Publication details

The article was received on 22 Aug 2017, accepted on 04 Oct 2017 and first published on 04 Oct 2017


Article type: Paper
DOI: 10.1039/C7CP05734B
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    A Novel Multimode Sensor Showing Cation-Dependent Fluorescence Colour

    S. Fujii, R. Ishimura, A. Nakagawa and N. Kitamura, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP05734B

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