A Sensitive and Selective Mercury(II) Sensor Based on Amplified Fluorescence Quenching in a Conjugated Polyelectrolyte/Spiro-Cyclic Rhodamine System

作者：Lee Seoung Ho; Parthasarathy Anand; Schanze Kirk S^*

来源：Macromolecular Rapid Communications, 2013, 34(9): 791-795.

DOI：10.1002/marc.201300020

• amplified quenching
• conjugated polymer
• conjugated polyelectrolyte
• fluorescence sensor
• mercury ion sensor

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 x 106 M repeat unit concentration) and 1 (1 x 106 M concentration) in aqueous solution exhibits a sensitive and selective turn-off fluorescence response to Hg(II). The SternVolmer quenching constant for quenching of the fluorescence of the system by Hg(II) is approximate to 1.5 x 107 M1, and Hg(II) can be sensed with a detection limit <10 x 109 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.

• 出版日期2013-5-14