Authors designed the monomers having hetero-aromatic rings in their structures as optical materials of high refractive index. Among various hetero-aromatics, we noticed thiophene has a large atomic refraction. We synthesized novel mono- and bi-functional thiophene methacrylate derivatives. Their homopolymers had high refractive indices indeed and are promising for optical materials.
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Matsuda et al. (1999) studied this question.