Structural Control in Thin Layers of Poly(<i>p</i>-phenyleneethynylene)s: Photophysical Studies of Langmuir and Langmuir−Blodgett Films
作者:Jinsang Kim、Igor A. Levitsky、D. Tyler McQuade、Timothy M. Swager
DOI:10.1021/ja0200600
日期:2002.7.1
at the air-waterinterface. Monolayer LB films of these polymers showed greatly reduced quantum yields relative to solution values. Other polymers exhibited a highly emissive face-on structure at the air-waterinterface, and did not form pi-aggregates. The combination of pressure-area isotherms and the surface pressure dependent in situ UV-vis spectra of the polymers at the air-waterinterface revealed
我们展示了空间排列与具有受控结构的薄膜中荧光聚合物的光物理特性之间的关系。设计和研究了八种表面活性剂聚(对亚苯基乙炔)。这些对聚合物在空气-水界面上的行为及其转移的 LB 薄膜的光物理性质的详细研究揭示了关键的结构-性能关系。一些聚合物显示出 pi 聚集体,这是在空气-水界面处边缘结构的特征。这些聚合物的单层 LB 薄膜显示出相对于溶液值大大降低的量子产率。其他聚合物在空气-水界面处表现出高发射性的正面结构,并且没有形成 pi 聚集体。空气-水界面处聚合物的压力-面积等温线和表面压力相关的原位紫外-可见光谱的组合揭示了不同的行为细节。此外,LB 薄膜的紫外-可见光谱、荧光光谱和量子产率为制造高发射薄膜提供了设计原则。
Photocurrent Generation in Multilayer Self-Assembly Films Fabricated from Water-Soluble Poly(phenylene vinylene)
technique. The multilayer structures were studied by UV/Vis spectroscopy, small angle X-ray diffraction, and atomic force microscopy. The photoinduced charge transfer property of the self-assembled multilayerfilm was also measured by a three-electrode cell technique. A steady and rapid cathodic 5.5 microA cm(-2) photocurrent response was measured as the irradiation of the multilayerfilm was switched
Jacketed Poly(<i>p</i>-phenyleneethynylene)s: Nonaggregating Conjugated Polymers as Blue-Emitting Rods
作者:Brian C. Englert、Mark D. Smith、Kenneth I. Hardcastle、Uwe H. F. Bunz
DOI:10.1021/ma048535q
日期:2004.11.1
A series of dendronized poly(p-phenyleneethynylene)s were synthesized by the Pd-catalyzed coupling of a tetraphenylbenzene-substituted aromatic diiodide to 2,5-didodecyl-1,4-diethynylbenzene to form PPEs in excellent yield and high degree of polymerization. The tetraphenylbenzene-substituted monomer was obtained by a Diels-Alder reaction of a diethynylated arene with tetraphenylcyclopentadienone. The influence of the tether length (connecting the tetraphenylbenzene units to the main chain of the polymer) on the optical properties of the polymers was investigated. The closer the tetraphenylbenzene units were placed to the main chain, the larger is their effect upon the PPE's optical properties. In the case where the tether is shortest, i.e., two atoms, the optical properties of the PPE in the solid state and in solution are identical.
Zhou, Qin; Swager, Timothy M., Journal of the American Chemical Society, 1995, vol. 117, # 26, p. 7017 - 7018
作者:Zhou, Qin、Swager, Timothy M.
DOI:——
日期:——
Emissive species for clinical imaging
申请人:Moon Joongho
公开号:US20070281289A1
公开(公告)日:2007-12-06
The present invention relates to materials and methods useful in the study of cells and species associated with cells. Materials of the present invention may include emissive, photostable organic molecules (e.g., conjugated polymers, conjugated oligomers) that are appropriately functionalized to interact with a cell with essentially no disruption in normal cell functioning. The present invention may be useful in, for example, cell imaging, cell tracking, in vivo monitoring of cellular events, drug delivery, and determination of biological species. In one embodiment, a conjugated polymer or oligomer may be internalized into a cell and may exhibit a strong and stable emissive signal, allowing the cell to be monitored under extensive microscopic conditions for extended periods of time.