Color Tuning of Polyfluorene Emission with BODIPY Monomers
Color Tuning of Polyfluorene Emission with BODIPY Monomers
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DOI：
10.1021/ma8023975
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发表时间：
2009-03-24
期刊：
影响因子：
5.5
通讯作者：
Liu, Haiying
中科院分区：
文献类型：
--
作者：
Meng, Ge;Velayudham, Singaravelu;Liu, Haiying
以9,9-二己基芴-2,7-二硼酸为原料，分别与2,6-二碘取代的BODIPY单体进行了钯催化铃木聚合，制备了三种主链上芴和BODIPY单元交替的荧光共轭共聚物。用红外光谱、紫外-可见光谱、光致发光（PL）和分子量研究对共聚物进行了表征。低带隙BODIPY共聚物由于π共轭的显著延伸，有效地将发射波长扩展到橙色区域，并显著增强了荧光强度，在二氯甲烷溶液中荧光量子产率高达85%。在二氯甲烷溶液中，该共聚物的最大吸收波长在547 ~ 557 nm之间，最大发射波长在585 ~ 588 nm之间。该共聚物分子量高，溶解度好，易溶于THF、CH2Cl2、CHCl3、甲苯等常见有机溶剂。共聚物通过其多价相互作用对氟化物和氰化物阴离子表现出敏感的荧光反应，而对氯化物、溴化物和碘化物阴离子没有反应。
Three fluorescent conjugated copolymers, comprised of alternating fluorene and BODIPY units in the main chain, have been prepared by palladium-catalyzed Suzuki polymerization of 9,9-dihexylfluorene-2,7-diboronic acid with each of three different 2,6-diiodo-substituted BODIPY monomers. The copolymers were characterized using FT-IR spectroscopy, UV-vis spectroscopy, photoluminescence (PL), and molecular weight studies. Low-band gap BODIPY comonomers are effective in expanding the emission wavelength to the orange region because of significant extension of pi-conjugation and have significantly enhanced fluorescent intensity with fluorescent quantum yield of up to 85% in methylene chloride solution. The copolymers show absorption maxima between 547 and 557 nm and emission maxima between 585 and 588 urn in methylene chloride solutions. The copolymers possess high molecular weight, good solubility and readily dissolve in common organic solvents Such as THF, CH2Cl2, CHCl3, and toluene. The copolymers display sensitive fluorescent responses to fluoride and cyanide anions through their multivalent interactions while they do not respond to chloride, bromide, and iodide anions.