Novel Reversible Chemosensory Material Based on Conjugated Side-Chain Polymer Containing Fluorescent Pyridyl Receptor Pendants

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• 作者：Hsuan-Chih Chu ; Yu-Hsien Lee ; Shou-Jen Hsu ; Po-Jen Yang ; Atsushi Yabushita ; Hong-Cheu Lin
• 刊名：Journal of Physical Chemistry B
• 出版年：2011
• 出版时间：July 21, 2011
• 年：2011
• 卷：115
• 期：28
• 页码：8845-8852
• 全文大小：952K
• 年卷期：v.115,no.28(July 21, 2011)
• ISSN：1520-5207

文摘

A novel light-emitting monomer M1 and its side-chain polymer P1 containing three conjugated aromatic pendants, including one pyridyl terminus, were successfully synthesized via Wittig and Pd-catalyzed Heck coupling reactions. The fluorescence of polymer P1 was efficiently quenched upon addition of different metal ions due to the facile energy transfers from the pendent groups of polymer P1 to specific metal ions. Among these metal ions, P1 exhibited extraordinary sensory selectivities for Ni²⁺ and Cu²⁺ ions over the other metal ions due to the stronger binding capabilities of Ni²⁺ and Cu²⁺ ions with polymer P1. From the time-resolved fluorescence (TRF) signals in photoluminescence spectra, the emergences of 蟿₁ decay components in polymer complexes (P1+Ni²⁺) and (P1+Cu²⁺) clearly indicated that their TRF traces consisted of two contributions, one from the complexes (蟿₁) and the other from free polymer P1 (蟿₂). Upon addition of Ni²⁺ and Cu²⁺ ions, polymer P1 showed faster decay time constants (蟿₁) of metal ion quenching on TRF signals (i.e., better quenching efficiencies on photoluminescence) than its monomer M1. Furthermore, the on鈥搊ff鈥搊n fluorescent switching behavior by adding a tridentate ligand 1,1,4,7,7-pentamethyldiethylenetriamine (PMDTA) to the polymer complex (P1+Cu²⁺) for several successive cycles demonstrated a superior reusable chemosensor of P1 for further applications.