Hg2+-induced self-assembly of a naphthalimide derivative by selective turn-on monomer/excimer emissions

• Main Authors: Wanichacheva,N., Prapawattanapol,N., Sanghiran Lee,V., Grudpan,K., Petsom,A.
• Format: Article
• Published: Elsevier 2015
• Subjects: Chemistry (all); Atomic and Molecular Physics, and Optics; Biochemistry; Condensed Matter Physics; Biophysics
• Online Access: http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=84869507121&origin=inward; http://cmuir.cmu.ac.th/handle/6653943832/38641
• Institution: Chiang Mai University

A novel fluorescent sensor bearing two naphthalimide fluorophores based on 2-(3-(2-aminoethylsulfanyl)propylsulfanyl)ethanamine, 1, was readily synthesized for the recognition of Hg2+. The sensitive and selective binding behaviors of 1 were investigated by fluorescence spectroscopy. Sensor 1 selectively binds Hg2+ by exhibiting OFF-ON fluorescence enhancement behaviors of the monomer and excimer bands. The sensor provides excellent Hg2+-selectivity in the presence of high concentrations of competitive ions, particularly Cu2+ and Pb2+ as well as Na+, K+, Mn2+, Cd2+, Ni 2+, Ca2+, Li+, Zn2+ and Co 2+, with an available detection limit of 2.1×10-7 M or 42 ppb. © 2012 Elsevier B.V. All rights reserved.