(Chemical Equation Presented) N-(Rhodamine-6G)lactam-N′- phenylthiourea-ethylenediamine (1) was developed as a fluorescent and colorimetric chemodosimeter in aqueous solution with a broad pH span (5-10) and high selectivity toward Hg2+ but no significant response toward other competitive cations, such as Fe2+, Co2+, Ni2+, Cu2+, Zn2+, Pb2+, Cd2+, Ca 2+, Mg2+, K+, Na+, etc. The Hg 2+-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).
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Organic Chemistry