title: A solvent-dependent fluorescent detection method for Fe(3+) and Hg(2+) based on a rhodamine B derivative.
abstract: A new rhodamine B-benzofurazan based fluorescent probe (1) for Fe(3+) and Hg(2+) was synthesized. In aqueous solution containing 30% (v/v) ethanol, probe 1 shows a high selective fluorescent enhancement recognition to Fe(3+) with a binding ratio of 1:1 (probe 1: Fe(3+)), when the concentration of Fe(3+) is less than that of the probe. When the concentration of Fe(3+) is higher than that of the probe, it shows fluorescent "turn-on" response to Fe(3+) by opening the rhodamine spirolactam with a binding ratio of 1:2 (probe 1: Fe(3+)). Furthermore, probe 1 displays a high selectivity and a hypersensitivity (detection limit is 4.4nM) to Hg(2+) with a binding ratio of 1:1 in ethanol. NMR and UV-vis experiments indicate that the different fluorescent recognition signals to Fe(3+) and Hg(2+) are derived from different binding modes of 1-Fe(3+) and 1-Hg(2+).
authors.affiliation: School of Chemistry and Environment, South China Normal University, Shipai, Guangzhou 510631, PR China.
authors.forename: Xutian
authors.initials: X
authors.lastname: Li
authors.affiliation: School of Chemistry and Environment, South China Normal University, Shipai, Guangzhou 510631, PR China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Yin
authors.affiliation: School of Chemistry and Environment, South China Normal University, Shipai, Guangzhou 510631, PR China.
authors.forename: Junjie
authors.initials: J
authors.lastname: Deng
authors.affiliation: School of Chemistry and Environment, South China Normal University, Shipai, Guangzhou 510631, PR China.
authors.forename: Huixian
authors.initials: H
authors.lastname: Zhong
authors.affiliation: School of Chemistry and Environment, South China Normal University, Shipai, Guangzhou 510631, PR China.
authors.forename: Jian
authors.initials: J
authors.lastname: Tang
authors.affiliation: School of Chemistry and Environment, South China Normal University, Shipai, Guangzhou 510631, PR China.
authors.forename: Zhi
authors.initials: Z
authors.lastname: Chen
authors.affiliation: School of Chemistry and Environment, South China Normal University, Shipai, Guangzhou 510631, PR China.
authors.forename: Liting
authors.initials: L
authors.lastname: Yang
authors.affiliation: School of Chemistry and Environment, South China Normal University, Shipai, Guangzhou 510631, PR China; Guangzhou Key Laboratory of Materials for Energy Conversion and Storage, PR China; Key Laboratory of Theoretical Chemistry of Environment Ministry of Education, PR China. Electronic address: mlj898021@aliyun.com.
authors.forename: Li-Jun
authors.initials: LJ
authors.lastname: Ma
mesh_terms: D005456:Fluorescent Dyes; D007501:Iron; D008628:Mercury; D012235:Rhodamines / Q000737:chemistry*; D012997:Solvents
chemical_list: D005456:Fluorescent Dyes; D012235:Rhodamines; D012997:Solvents; D007501:Iron; D008628:Mercury; C029773:rhodamine B
keywords: Dual channel signal; Fe(3+) and Hg(2+); Fluorescent probe; Medium-controlled recognition; Rhodamine B-benzofurazan