Synthesis, characterization, and Pb2+ ion sensing application of hexa‐armed dansyl end‐capped poly(ε‐caprolactone) star polymer with phosphazene core. Issue 32 (14th May 2015)

• Record Type: Journal Article
• Authors: Gorur, Mesut; Doganci, Erdinc; Yilmaz, Faruk; Isci, Umit
• Is Part Of: Journal of applied polymer science. Volume 132:Issue 32(2015)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2015-05-14
• Subjects: Polymers -- Periodicals; Polymerization -- Periodicals; 668.9
• DOI: 10.1002/app.42380
• Languages: English
• ISSNs: 0021-8995

Abstract

<abstract abstract-type="main"> <title>ABSTRACT</title> <p>Novel hexa‐armed dansyl end‐capped poly(ε‐caprolactone) (PCL) star polymer with phosphazene core (<bold>P2</bold>) was prepared via ring opening polymerization (ROP) and esterification reactions. <bold>P2</bold> showed dual fluorescence emission when excited at 328 nm in acetonitrile : water (6 : 4) due to twisted intramolecular charge transfer (TICT) between dimethylamino and naphthalene units in the dansyl moiety. TICT emission band (A band) in the emission spectra red‐shifted with increasing solvent polarity. <bold>P2</bold> responded to the addition of Pb<sup>2+</sup>, Hg<sup>2+</sup>, Co<sup>2+</sup>, Cd<sup>2+</sup>, Mn<sup>2+</sup>, and Zn<sup>2+</sup> metal ions by decreasing TICT emission band with slight bathochromic shifts. The highest quenching efficiency was observed for Pb<sup>2+</sup> ion with Stern–Volmer constant of 324.74<italic>M<sup>−</sup></italic><sup>1</sup>. The Stern–Volmer plot for Pb<sup>2+</sup> was rather linear with the increasing concentration of the quencher, indicating a dynamic (collisional) quenching mechanism. Stern–Volmer constants for Hg<sup>2+</sup>, Co<sup>2+</sup>, Cd<sup>2+</sup>, Mn<sup>2+</sup>, and Zn<sup>2+</sup> ions were found to be 212.33, 189.21, 36.24, 20.84, and 20.69, respectively. Besides, the highest quenching efficiency (94.24%) was attained in the presence of Pb<sup>2+</sup>, suggesting that <bold>P2</bold> could be employed as a potential Pb<sup>2+</sup> chemical probe. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. <bold>2015</bold>, <italic>132</italic>, 42380.</p> </abstract>