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| - Solvatochromic Characterization of Organic−Inorganic Polymer Hybridswith Pyridinium N-Phenolate Betaine Dyes
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| - We have estimated the local polarity in organic−inorganic polymer hybrids by employingsolvatochromic pyridinium N-phenolate betaine dyes. Solvatochromic polymer was prepared by introducingReichardt's betaine dye in the side chain of poly(2-methyl-2-oxazoline), and the model compound for thedye unit was also prepared. Polymer hybrids were prepared from these compounds and mixtures of variousproportions of tetramethoxysilane (TMOS) and methyltrimethoxysilane (MeTMOS). The electronicabsorption spectra were measured by the diffuse reflectance method. It was found that the local polarityin the polymer hybrids was affected by both the TMOS:MeTMOS ratio and the presence of the organicpolymer. In addition, it was suggested that the dye molecules are preferentially surrounded by the organicpolymer rather than the siloxane network in the polymer hybrids.
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