Effect of aliphatic tails on surface anchoring of amphiphilic ruthenium-polypyridine complexes in water-cast polymer films as studied by photoinduced electron-transfer and optical second harmonic generation

A thin poly(methyl methacrylate) (PMMA) film incorporating an amphiphilic ruthenium (Ru)-polypyridine complex having two (Ru2C16B) or four (Ru4C16B) aliphatic tails, and/or an amphiphilic viologen (LPV), was prepared on a water surface. Both interfacial and in-film photoinduced electron-transfer fro...

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Bibliographic Details
Published in:Thin solid films 1999-01, Vol.352 (1), p.1-5
Main Authors: Yamada, Sunao, Niidome, Yasuro, Nakano, Takashi, Tanaka, Yu-ki, Shimada, Yoshihisa, I-Yin Lee, Sandy, Matsuo, Taku
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Photoinduced electron-transfer
Physicochemistry of polymers
Polymers and radiations
Properties and characterization
Second harmonic generation
Thin polymer film
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Summary:A thin poly(methyl methacrylate) (PMMA) film incorporating an amphiphilic ruthenium (Ru)-polypyridine complex having two (Ru2C16B) or four (Ru4C16B) aliphatic tails, and/or an amphiphilic viologen (LPV), was prepared on a water surface. Both interfacial and in-film photoinduced electron-transfer from the Ru-complex to LPV occurred more effectively in Ru2C16B as compared with Ru4C16B, suggesting more exposure of the hydrophilic head group of Ru2C16B at the film surface. Polarized optical second harmonic generation (SHG) studies on the Ru-complex-impregnated film also verified orientational difference between the two complexes; Ru4C16B tended to take more stand-up orientation as to the film surface. The SHG signal increased quadratically with the number of films in the presence of air gaps among them.
ISSN:0040-6090
1879-2731
DOI:10.1016/S0040-6090(99)00394-6