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A novel ionic responsive Schiff base organic gelator was successfully designed and synthesized. The solvent selection experiment showed that the gelator showed good thermoreversible gelator behavior in aniline, valerate alcohol and isopropyl alcohol. FT-IR studies have shown that C=O and N–H of molecules participate in the formation of intermolecular hydrogen bonds, thus promoting the formation of gelator states. The XRD and SEM results show that the molecules self-assemble in the dry gelator to form the entangled network structure. In addition, the fluorescence spectrum test of gelling agent G showed that gelling agent G could specifically recognize Cu2+. Gelator G has good selectivity, low detection limit (2.92 × 10–8 M) and high sensitivity, which can be applied to the detection of Cu2+ in biology, environment and other fields. The results show that gelator G has broad application prospects in materials science, chemistry, biomedicine and other fields. It also confirms that benzopyran-derived hydrazone Schiff base compounds have far-reaching research significance. [ABSTRACT FROM AUTHOR]

A photo-induced electron transfer cationic fluorescence probe L1 based on pyrene-naphthol system was designed to detect the change of Cu2+ with fluorescence. The probe L1 was found to selectively recognize Cu2+ in aqueous ethanol solution [10.0 mmol/L HEPES, pH 7.4, EtOH–H2O = 1:1 (v/v)] without interference from other coexisting metal ions. The response of the sensor to Cu2+ is transient and reversible, and anions generally have no impact on the selectivity of Cu2+. Probe L1 forms complex with Cu2+ in 1:1 ratio as supported by Job's plot analysis. The binding constants of Cu2+ was calculated to be 6.322 × 104 L/mol using a nonlinear curve-fitting method. The detection limit of Cu2+ was determined to be 1.620 × 10–7 mol/L. The energy gap between HOMO and LUMO in L1 and L1–Cu2+ was calculated by density functional theory as 3.76 eV and 2.71 eV, respectively. In addition, the probe L1 has extremely low cytotoxicity and can be used for living cell imaging studies. [ABSTRACT FROM AUTHOR]