Abstract
The coloration behavior of the inorganic/organic hybrids prepared from polydimethylsiloxane (PDMS) and chemically modified metal alkoxides was investigated by ultraviolet-visible (UV-VIS), X-ray photoelectron (XPS) and electron spin resonance (ESR) spectroscopies. Although the hybrids were transparent in the visible region, a broad absorption was observed from the visible to UV regions, leading to a color from yellow to wine-red. The color and the absorption edge of the hybrids depend on the inorganic components derived from metal alkoxides. XPS study showed the presence of a specific chemical state of metallic ions in the inorganic components derived from metal alkoxides. The XPS study revealed that a certain amount of metallic ions in the inorganic components derived from metal alkoxides is present in a specific chemical state that is distinct from a simple oxide. The ESR study showed the presence of localized electrons in the inorganic components derived from metal alkoxides or in an organic compound produced by decomposition of ethyl acetoacetate (EAcAc). The localized electrons may be relevant to the coloration of the hybrids.
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