标题:Trifluoromethyl-Substituted Conjugated Oligoelectrolytes
作者:Ren, Yan; Bazan, Guillermo C.
作者机构:[Ren, Yan; Bazan, Guillermo C.] Univ Calif Santa Barbara, Ctr Polymers & Organ Solids, Dept Mat, Santa Barbara, CA 93106 USA.; [Ren, Yan; Bazan, Gui 更多
通讯作者:Bazan, G C
通讯作者地址:[Bazan, GC]Univ Calif Santa Barbara, Ctr Polymers & Organ Solids, Dept Mat, Santa Barbara, CA 93106 USA.
来源:CHEMISTRY-A EUROPEAN JOURNAL
出版年:2010
卷:16
期:36
页码:11028-11036
DOI:10.1002/chem.201000885
关键词:biosensors; charge transfer; conjugation; oligoelectrolytes;; photoluminescence
摘要:Conjugated oligoelectrolytes (COEs) are being introduced into a variety of optical and electronic technologies, yet the dependence of their properties as a function of molecular structure remains poorly understood. In response, we designed, synthesized, and examined a new tetracationic COE, namely, 1,4-bis{9',9'-bis[6 ''-(N.N,N-trimethylammonium)hexyl]-2'-fluorenyl]-2,5-bis(trifluoromethyl)benzene tetrabromide (FPF-F6), which contains bulky electron-withdrawing trifluoromethyl groups, and compared its properties with the unsubstituted counterpart 1,4-bis(9',9'-bis[6 ''-(N,N,N-trimethylammonium)hexyl]-2'-fluorenyllbenzene tetrabromide (FPF). The ground-state geometry of FPF-F6 is primarily twisted with little electronic communication between the aromatic units, as confirmed by single-crystal X-ray diffraction studies of the neutral precursor. However, absorption and photoluminescence spectroscopies reveal that the excited state of FPF-F6 displays strong intramolecular charge-transfer characteristics. Solution AFM in aqueous media shows that introduction of trifluoromethyl groups changes the size and aspect ratio of supramolecular aggregates that are brought together as a result of hydrophobic interactions. Furthermore, addition of ssDNA to FPF-F6 leads to interoligoelectrolyte complexes wherein the backbone is more planar; the environment the chromophore experiences under these conditions is also considerably less polar. These findings provide considerable insight into the complex photophysics of electronically conjugated materials in aqueous media.
收录类别:EI;SCOPUS;SCIE
WOS核心被引频次:1
Scopus被引频次:1
资源类型:期刊论文
原文链接:https://www.scopus.com/inward/record.uri?eid=2-s2.0-77956974580&doi=10.1002%2fchem.201000885&partnerID=40&md5=b55c31aeeb8f1a495c6560cf76c7525e
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