Phosphonate-Functionalized Polyfluorene as a Highly Water-Soluble Iron(III) Chemosensor

被引：84

作者：

Qin, Chuanjiang ^{[1
,2
]}

Cheng, Yanxiang ^{[1
]}

Wang, Lixiang ^{[1
]}

Jing, Xiabin ^{[1
]}

Wang, Fosong ^{[1
]}

机构：

[1] Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Peoples R China

[2] Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China

来源：

MACROMOLECULES | 2008年 / 41卷 / 21期

基金：

中国国家自然科学基金;

关键词：

D O I：

10.1021/ma801282m

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

An anionic, phosphonate-functionalized polyfluorene, i.e., poly(9,9-bis(3'-phosphatepropyl)fluorene-alt-1,4-phenylene) sodium salt (PFPNa), has been synthesized by copolymerization of phosphonic acid-substituted 2,7-dibromofluorene and phenyldiboronic ester via direct Suzuki polycondensation reaction in DMF/water. Polymer PFPNa is highly soluble and emissive in water with a solubility of 60 mg/mL and a photoluminescence quantum yield of 75%. The absorption and fluorescence spectra of PFPNa are strongly dependent on pH value owing to the partial protonation of phosphate groups and the aggregation of the polymer chains. In aqueous media polymer PFPNa shows high sensitivity and selectivity for Fe3+. A 400-fold fluorescence quenching was achieved upon adding Fe3+ into its aqueous solution. Most importantly, ultrathin multilayer films constructed by alternatively depositing polyanionic PFPNa and polycationic poly(diallyldimethylamine) via the layer-by-layer (LbL) self-assembling method are stable and highly sensitive to Fe3+ with a sensitivity up to 10(-7) M.

引用

页码：7798 / 7804

页数：7

共 70 条

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