Spectroscopic properties of Langmuir-Blodgett films of amphiphilic polysilanes
1994; Elsevier BV; Volume: 243; Issue: 1-2 Linguagem: Inglês
10.1016/0040-6090(93)04129-g
ISSN1879-2731
AutoresTakahiro Seki, Takashi Tamaki, Katsuhiko Ueno, Yūki Tanaka,
Tópico(s)Marine Biology and Environmental Chemistry
ResumoTwo novel polysilanes that bear an amphiphilic ammonium moiety in the side substituent are synthesized. The spreading behaviors of these polymers at the air-water interface, the LB deposition, and their spectroscopic properties are investigated. Utilizing the strong UV absorption of the SiSi backbone attributed to the localized σ electron, substantial knowledge on the conformation and orientation of the main chain is readily obtained by UV-visible absorption spectroscopic measurements. Compression of the polysilane monolayer at the air-water interface induces a blue shift of the σ−σ∗ band around 300 nm, which is reasonably attributed to the trans-gauche populatioal changes of the backbone. The SiSi backbone aligns parallel to the dipping direction in the multilayered Langmuir-Blodgett films for both polysilanes.
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