Photochromism in Oriented Thin Films Prepared by the Hybridization of Diarylethenes in Clay Interlayers

Photo-induced coloration of 2-hydroxychalcone in the clay interlayer

“…Incorporation into the clay layer makes available the application of the photochromic system to the devices in various states such as a film. There have been several reports concerning the photochromic reaction of azobenzene [18], diarylethene [19,20] or spiropyran [21,22] derivatives between the clay layers. The clay interlayer has strong polarity, so that the reverse photochromism of spiropyran has been observed when incorporated in the clay interlayer [21,22].…”

Photochromic Intercalation Compounds

“…Intercalation of another cationic diarylethene, 1,2-bis(2'-methyl-5'-(1''-methyl-3''-pyridinio)thiophen-3'-yl)-3,3,4,4,5,5-hexafluorocyclopentene (1, the molecular structure is shown in Figure 3a), into montmorillonite was reported [33,144]. As schematically shown in Figure 3b, from XRD and UV-Vis polarized spectroscopy, the cationic diarlyethene 1 was shown to be anistropically accommodated with DMF in a gelatin film involving the dye-montmorillonite hybrid,.…”

“…Studies concerning photochromic reactions in solids have significance for practical applications such as optical recording. Accordingly, the interactions of photochromic dyes with layered solids has been investigated so far [30][31][32][33][34][35][36][37][38][39][40][41][42]. These studies have initially been done to characterize the interlayer nanospaces and the host-guest system, and then, to contribute to future practical applications of the intercalation compounds for optical recording and photoresponsive materials.…”

Luminous relative humidity sensing by anionic fluorescein dyes incorporated into layered double hydroxide/1-butanesulfonate hybrid materials

“…Recently, we reported the preparation of solid materials with strong luminous properties obtained by hybridization of various dyes (such as rhodamine and fluorescein) with inorganic layered materials including saponite, laponite, layered titanate, and LDH. [6][7][8][9][10][11][12][13][14][15][16][17]. Moreover, a few materials among our prepared solid hybrids exhibited a luminosity dependence on the composition and concentration of molecular species present in the surrounding environment.…”