Shi-jian Su, N. Kuramoto
Nov 28, 2001
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0
Influential Citations
20
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Journal
Chemistry of Materials
Abstract
Optically active poly(o-ethoxyaniline) (PEOA) was prepared in situ in organic solvents with (+)- or (−)-camphorsulfonic acid (CSA) as the chiral dopant. This presented an effective facile route to prepare optically active polyaniline derivatives with large ring substituents and to dispel the potential influence of water involved in the classical aqueous media on their chirality. Thin films of PEOA/(+)- and (−)-CSA or their solutions exhibit mirror-imaged circular dichroism spectra in the UV/visible region, indicating diastereoselection in the former in situ polymerization system. The optical activity can be ‘memorized' in the solid state during dedoping/redoping cycles indicating that the observed optical activity arises from the macroasymmetry of the polymer backbone and not the (+)-CSA dopant. A strong solvent effect exists on the PEOA's chain conformation and subsequent chiroptical property. Changing the nature of the solvent has a significant influence on the positions of the bipolaron band in the UV/...