A novel relay-sensor for highly sensitive and selective detection of Zn2+/Pic− and fluorescence on/off switch response of H+/OH−

Publication date: August 2017
Source:Sensors and Actuators B: Chemical, Volume 247
Author(s): Bao-Jun Wang, Wen-Kui Dong, Yang Zhang, Sunday Folaranmi Akogun
A novel naphthalenediol-based bis(Salamo)-type tetraoxime compound (H4L) was synthesized and characterized. Its Zn²⁺ complex was found to be highly sensitive for the detection of Pic⁻ when dissolved in water-containing organic solvent. Sensor H4L acts as a relay-sensor for recognition of Zn²⁺ while the L-Zn²⁺ complex recognizes Pic⁻ with high selectivity and sensitivity in acceptable physiological pH range. Moreover, The L-Zn²⁺ and its Pic⁻ polymer complex display successive sensing of H⁺/OH⁻ via increase (ON) and decrease (OFF) in fluorescence intensity. The crystal structure of the Zn²⁺ complex has been determined by single-crystal X-ray diffraction.

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