A novel multimode sensor showing cation-dependent fluorescence colour

作者：Fujii Sho; Ishimura Ryo; Nakagawa Atsushi; Kitamura Noboru

来源：Physical Chemistry Chemical Physics, 2017, 19(42): 28943-28949.

DOI：10.1039/c7cp05734b

A novel sensor, 4-[2-(9-anthryl) ethynyl]-1,10-phenanthroline (1), exhibits highly intense fluorescent in the wavelength region of 440-600 nm (maximum wavelength (lf) = 470 nm) with the quantum yield (Ff) and lifetime (tf) 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, sensor 1 can tightly bind M2+ and shows intense fluorescent (Ff = 0.90-0.19, tf = 2.1-6.9 ns) with the color being dependent on the nature of M2+ (lf = 514-584 nm). The results demonstrate that a single fluorescent sensor 1 is capable of simultaneous identification and quantitation of M2+ based on lf and the fluorescent intensity (Ff), 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 sensor 1 in the absence and presence of M2+ are also discussed.

• 出版日期2017-11-14