02400nas a2200241   4500008004100000022001400041245013100055210006900186260006800255300001400323490000700337520152000344653002301864653001701887653002601904653001201930653001401942653001801956100002001974700002101994700001902015856012402034       2009                        eng d  a0887-624X00aCarboxylic-functionalized water soluble pi-conjugated polymer: highly selective and efficient chemosensor for mercury(II) ions0 aCarboxylicfunctionalized water soluble piconjugated polymer high  a111 RIVER ST, HOBOKEN, NJ 07030 USAbJOHN WILEY & SONS INCcOCT  a5144-51570 v473 a<p>Here, we report a new carboxylic-functionalized water soluble pi-conjugated polymer for selective detection of highly toxic Hg(2+) in neutral pH condition. carboxylic-functionalized thiophene containing oligophenylenevinylene was synthesized and polymerized under oxidative route to obtain water soluble polymer. Free carboxylic groups present in the pi-conjugated materials provide opportunity to use pH as external stimuli for studying secondary interaction such as hydrogen bonding and aromatic pi-stacking of the chromophores. The pH changes strongly influence on the molecular interactions in the monomer, whereas the long chain polymer was less disturbed. The polymer showed high selectivity for detecting Hg(2+) ions compared with any other transition metal ions in water. The detection efficiency of the polymer was found almost 40 times higher than that of its monomeric unit. Stern-Volmer constant for the Hg(2+) ion sensing was determined through concentration dependent studies as 6.4 x 10(5) M(-1). The carboxylic-functionalized polymer showed reversibility in the metal-ion detecting capabilities which was further investigated by NaCl complexation with Hg(2+) complex. Both funneling of excitation energy to the Hg(2+) center and also excitation energy migration through chain pi-conjugated backbone were correlated to the superior sensing characteristics of the polymer compared to its monomeric counterpart. (C) 2009 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 47: 5144-5157, 2009</p>10aconjugated polymer10apH sensitive10aphotophysical studies10asensing10asynthesis10awater soluble1 aBalamurugan, A.1 aReddy, M., L. P.1 aJayakannan, M.  uhttps://library.ncl.res.in/content/carboxylic-functionalized-water-soluble-pi-conjugated-polymer-highly-selective-and-0