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A Sensitive and Selective Mercury(II) Sensor Based on Amplified Fluorescence Quenching in a Conjugated Polyelectrolyte/Spiro‐Cyclic Rhodamine System
Author(s) -
Lee Seoung Ho,
Parthasarathy Anand,
Schanze Kirk S.
Publication year - 2013
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.201300020
Subject(s) - fluorescence , aqueous solution , quenching (fluorescence) , detection limit , rhodamine , mercury (programming language) , polyelectrolyte , chemistry , rhodamine b , conjugated system , photochemistry , analytical chemistry (journal) , chromatography , organic chemistry , polymer , physics , quantum mechanics , photocatalysis , computer science , catalysis , programming language
A novel fluorescence‐based sensor for mercury(II) ion is described consisting of a water‐soluble, anionic‐conjugated polyelectrolyte (CPE) and spiro‐cyclic rhodamine derivative ( 1 ). A solution containing the CPE (0.1 × 10 −6 M repeat unit concentration) and 1 (1 × 10 −6 M concentration) in aqueous solution exhibits a sensitive and selective turn‐off fluorescence response to Hg(II). The Stern–Volmer quenching constant for quenching of the fluorescence of the system by Hg(II) is ≈1.5 × 10 7 M −1 , and Hg(II) can be sensed with a detection limit <10 × 10 −9 M. A mechanism for the sensor response is proposed and it consists of efficient and selective complex formation between 1 and Hg(II), along with a very high association between the 1‐ Hg(II) complex and the anionic CPE.