A Sensitive and Selective Mercury(II) Sensor Based on Amplified Fluorescence Quenching in a Conjugated Polyelectrolyte/Spiro‐Cyclic Rhodamine System. Issue 9 (26th March 2013)

• Record Type: Journal Article
• Authors: Lee, Seoung Ho; Parthasarathy, Anand; Schanze, Kirk S.; Tang, B. Z.; Liu, B.
• Is Part Of: Macromolecular rapid communications. Volume 34:Issue 9(2013:May)
• Page Start: 791
• Page End: 795
• Publication Date: 2013-03-26
• Subjects: Macromolecules -- Periodicals; Polymers -- Periodicals; Chemistry -- Periodicals; 547.705
• DOI: 10.1002/marc.201300020
• Languages: English
• ISSNs: 1022-1336

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>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 (<bold>1</bold>). A solution containing the CPE (0.1 × 10⁻⁶ M repeat unit concentration) and <bold>1</bold> (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 × 10⁷ M⁻¹, and Hg(II) can be sensed with a detection limit &lt;10 × 10⁻⁹ M. A mechanism for the sensor response is proposed and it consists of efficient and selective complex formation between <bold>1</bold> and Hg(II), along with a very high association between the <bold>1‐</bold>Hg(II) complex and the anionic CPE. <boxed-text content-type="graphic" position="anchor" orientation="portrait"><graphic position="anchor" mimetype="image" xlink:href="ark:/27927/pgg1zvgs96n" orientation="portrait" xlink:type="simple" xmlns:xlink="http://www.w3.org/1999/xlink" /></boxed-text></p> </abstract>