Spectroscopy and Photoexcitation Spectroscopies of Polyaniline: A Model Systemfor New Phenomena

摘要

Spectroscopy applied to solids is well established as an important means ofdetermining the electronic structure as well as the vibrational normal modes of solids. More recently, photoexcitation spectroscopy has been developed and applied to numerous materials. These techniques have been extensively applied to polyacetylene and other conjugated carbon backbone polymers. They have played a central role in developing an understanding of these electronic polymers. The polyanilines are a large versatile family of polymers that differ substantially from earlier studied electronic polymers. Spectroscopy plays an essential role in determining the electronic structure of these materials and how they vary with oxidation state, protonation, and derivatization. The electronic structure reflects important differences between the polyanilines and other earlier-studied electronic polymers, including the absence of charge conjugation symmetry.