title: Rhodamine-based Hg2+-selective chemodosimeter in aqueous solution: fluorescent OFF-ON.
abstract: [reaction: see text] N-(Rhodamine-6G)lactam-N'-phenylthiourea-ethylenediamine (1) was developed as a fluorescent and colorimetric chemodosimeter in aqueous solution with a broad pH span (5 approximately 10) and high selectivity toward Hg2+ but no significant response toward other competitive cations, such as Fe2+, Co2+, Ni2+, Cu2+, Zn2+, Pb2+, Cd2+, Ca2+, Mg2+, K+, Na+, etc. The Hg2+-promoted ring opening of spirolactam of the rhodamine moiety induced cyclic guanylation of the thiourea moiety, which resulted in the dual chromo- and fluorogenic observation (OFF-ON).
authors.affiliation: Department of Chemistry, Dankook University, Seoul 140-714, Korea.
authors.forename: Jia-Sheng
authors.initials: JS
authors.lastname: Wu
authors.forename: In-Chul
authors.initials: IC
authors.lastname: Hwang
authors.forename: Kwang S
authors.initials: KS
authors.lastname: Kim
authors.forename: Jong Seung
authors.initials: JS
authors.lastname: Kim