Ansari Mosim, Bera Ranajit, Mondal Snehasish, Das Neeladri
Department of Chemistry, Indian Institute of Technology Patna, 801106 Bihar, India.
ACS Omega. 2019 May 29;4(5):9383-9392. doi: 10.1021/acsomega.9b00497. eCollection 2019 May 31.
Two new triptycene-based azobenzene-functionalized polymers () have been synthesized using the well-known Pd-catalyzed Sonogashira cross-coupling polycondensation reaction between 2,6-diethynyltriptycene and ( or ) dibromo-azobenzenes. Enhancement of the fluorescent emission intensity was observed upon trans → cis isomerization of -N=N- linkage in . The cis-lifetime of is rather long (greater than 2 days). The resulting materials were tested as a potential chemosensor for the detection of picric acid (PA)-a water pollutant as well as chemical constituent of explosives used in warfare. PA was found to interact strongly with , which led to significant quenching of the latter's fluorescence emission intensities. The binding constants are in the order of 10 M. were also able to detect PA in nanomolar concentrations.
通过2,6 - 二乙炔基三联苯与（或）二溴偶氮苯之间著名的钯催化Sonogashira交叉偶联缩聚反应，合成了两种新型的基于三联苯的偶氮苯功能化聚合物（）。在中，-N=N-键从反式→顺式异构化时，观察到荧光发射强度增强。的顺式寿命相当长（大于2天）。所得材料作为检测苦味酸（PA）的潜在化学传感器进行了测试，PA是一种水污染物以及用于战争的炸药的化学成分。发现PA与强烈相互作用，这导致后者的荧光发射强度显著猝灭。结合常数约为10 M。还能够检测纳摩尔浓度的PA。
