Poly(Bis-Alkoxyphenylsilanes): Thermo and Solvatochromic Behavior
IBM ALMADEN RESEARCH CENTER SAN JOSE CA
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The first soluble polybis alkoxyphenylsilanes have been prepared and characterized. The UV spectra of the bis-p-alkoxyphenyl derivatives show a strong absorption at unexpectedly short wavelengths. These materials are thermochromic and at higher temperatures their spectra resemble those reported for the bis p-alkylphenyl derivatives. On the basis of these results, we propose that the silicon backbone of the polybis-p-alkoxyphenylsilanes is substantially nonplanar at room temperature possibly due to unfavorable dipolar substituent interactions in the planar zigzag form. This suggestion is supported by studies on the corresponding m-alkoxyphenyl derivatives and unsymmetrical alkoxphenyl substituted diaryl polysilanes. These latter materials also show solvatochromic spectral changes due to conformer redistribution. Absorption characteristics, Chain conformations, Solvatochromism, Silanes, Phenyl radicals.
- Organic Chemistry