Energy and Electron Transfer from Fluorescent Mesostructured Organosilica Framework to Guest Dyes

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• 作者：Norihiro Mizoshita ; Ken-ichi Yamanaka ; Satoru Hiroto ; Hiroshi Shinokubo ; Takao Tani ; Shinji Inagaki
• 刊名：Langmuir
• 出版年：2012
• 出版时间：February 28, 2012
• 年：2012
• 卷：28
• 期：8
• 页码：3987-3994
• 全文大小：456K
• 年卷期：v.28,no.8(February 28, 2012)
• ISSN：1520-5827

文摘

Energy and electron transfer from frameworks of nanoporous or mesostructured materials to guest species in the nanochannels have been attracting much attention because of their increasing availability for the design and construction of solid photofunctional systems, such as luminescent materials, photovoltaic devices, and photocatalysts. In the present study, energy and electron-transfer behavior of dye-doped periodic mesostructured organosilica films with different host鈥揼uest arrangements were systematically examined. Fluorescent tetraphenylpyrene (TPPy)鈥搒ilica mesostructured films were used as a host donor. The location of guest perylene bisimide (PBI) dye molecules, acting as an acceptor, could be controlled on the basis of the molecular design of the PBI substituent groups. PBI dyes with bulky substituents and polar anchoring groups were located at the pore surface with low self-aggregation, which induced efficient energy or electron transfer because of the close host鈥揼uest arrangement. However, PBI dye with bulky and hydrophobic substituents was located in the center of template surfactant micelles; the fluorescence emission from the host TPPy groups was hardly quenched when the host鈥揼uest distance was longer than the critical F枚rster radius (ca. 4.5 nm). The relationship between the energy or electron-transfer efficiency and the location of guest species in the channels of mesostructured organosilica was first revealed by molecular design of the PBI substituents.