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

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. (c) 2017 Elsevier B.V. All rights reserved.