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Naphthalene ring-fused 2-aminotryptanthrin (Naph-T2NH2) was synthesized as a fluorescent chemosensor for Al3+. We investigated the metal-ion recognition of Naph-T2NH2 through individual addition of Mg2+, Ca2+, Ba2+, Fe2+, Fe3+, Co2+, Ni2+, Cu2+, Ag+, Zn2+, Cd2+, Hg2+, Al3+, and Pb2+ in an acetonitrile solution. When Mg2+, Ca2+, Ba2+, Co2+, Ag+, Zn2+, and Cd2+ were individually added to the solution, the shape and intensity of the fluorescence spectra did not change. Conversely, when Fe2+, Fe3+, Ni2+, Cu2+, Hg2+, and Pb2+ were individually added to the solution, the fluorescence at 604 nm was quenched. However, the fluorescence at 494 nm increased significantly upon addition of Al3+. Thus, Naph-T2NH2 is well suited for use as a fluorescent chemosensor for Al3+.

Naphthalene Ring-Fused 2-Aminotryptanthrin as a Fluorescent Chemosensor for Al<sup>3+</sup>