Well-defined photochromic hybrid materials have been prepared by embedding spirooxazine dyes into matrices made of {(BuSn)12-O14(OH)6}2+ nano-building blocks assembled with α,ω-carboxymethyl poly(ethylene glycol) macromonomers (see Figure). Processed as 2–3 μm thick films, these materials exhibit fast and direct photochromism.
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Ribot et al. (2002) studied this question.