A new selective pyrazoline-based fluorescent chemosensor for Cu2+ in aqueous solution

A new pyrazoline derivate was designed and synthesized. The structure of the pyrazoline was confirmed by single crystal X-ray diffraction and its photophysical properties were studied by absorption and fluorescence spectra. This compound can be used to determine Cu2+ ion with high selectivity and sensitivity among a series of cations in aqueous tetrahydrofuran. This sensor forms a 1:1 complex with Cu2+ and displays fluorescent quenching. Pyrazoline derivate 1 for selective detection of Cu2+ with fluorescence quenching. [Display omitted] ► The pyrazoline derived sensor is simple to synthesize. ► The structure of the pyrazoline was confirmed by single crystal X-ray diffraction. ► This sensor can be used to determine Cu2+ ion with high selectivity and a low detection limit. ► It is the first example of Cu2+ ion fluorescent chemosensor in aqueous solution based on pyrazoline chromophore.