Sulfonated Indolinespirobenzopyran (SP-SO3–) and toluene-p-sulfonic acid were co-intercalated into a layered double hydroxide. The new intercalate exhibited photochromic properties; reversible photoisomerization between SP-SO3– and photoinduced merocyanine was attained and photoinduced merocyanine was thermally very stable.
H. Tagaya, T. Kuwahara, S. Sato, J. Kadokawa, M. Karasu and K. Chiba, J. Mater. Chem., 1993, 3, 317 DOI: 10.1039/JM9930300317
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