Abstract
Two 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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