Imine linked fluorescent chemosensor for Al3+ and resultant complex as a chemosensor for HSO4− anion

Imine linked chemosensor has been synthesized and examined for cation recognition properties. The sensor shows strong affinity for Al3+ over other cations such as Na+, K+, Mg2+, Ca2+, Ba2+, Sr2+, Cr3+, Mn2+, Fe3+, Co2+, Ni2+, Cu2+, Zn2+, Ag+, Hg2+, Pb2+, Zr4+, Th4+ and VO4+. The resultant Al3+ complex has been synthesized and characterized on the basis of elemental analysis, mass spectra, and IR spectra. The recognition behavior of this complex was tested towards various anions and the complex has offered an interesting opportunity for the ratiometric determination of HSO4− in DMF/H2O (7:3, v/v) solvent system. This is the first Al3+ complex used for the ratiometric determination of HSO4− in semi-aqueous medium.

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► Imine linked dipodal organic chemosensor has been synthesized.
► Selective detection of Al3+ through excited state proton transfer mechanism.
► The resulting aluminum complex of this sensor is selective for HSO4−.
► The ratiometric determination of HSO4− in semi-aqueous medium.