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Referencias:

• Dürr, H., Photochromism (1990) Molecules and Systems, pp. 1-14. , H. Dürr H. Bouas-Laurent Elsevier Amsterdam
• Crano, J.C., Guglielmetti, R.J., (1999) Organic Photochromic and Thermochromic Compounds, p. 2. , Kluwer Academic/Plenum Publishers New York
• Rau, H., Photochromism (1990) Molecules and Systems, pp. 165-192. , H. Dürr H. Bouas-Laurent, Elsevier Amsterdam
• Bertelson, R.C., (1999) Organic Photochromic and Thermochromic Compounds: Main Photochromic Families, 1, pp. 11-83. , Crano J.C. Guglielmetti R.J. Kluwer Academic/Plenum Publishers New York
• Maeda, S., (1999) Organic Photochromic and Thermochromic Compounds: Main Photochromic Families, 1, pp. 85-109. , Crano J.C.Guglielmetti R.J. Kluwer Academic/Plenum Publishers New York
• Van Gemert, B., (1999) Organic Photochromic and Thermochromic Compounds: Main Photochromic Families, 1, pp. 111-140. , Crano J.C.Guglielmetti R.J. Kluwer Academic/Plenum Publishers New York
• Irie, M., (1999) Organic Photochromic and Thermochromic Compounds: Main Photochromic Families, 1, pp. 207-222. , Crano J.C. Guglielmetti R.J. Kluwer Academic/Plenum Publishers New York
• Fan, M.G., Yu, L., Zhao, W., (1999) Organic Photochromic and Thermochromic Compounds: Main Photochromic Families, 1, pp. 141-206. , J.C. Crano R.J. Guglielmetti Plenum Publishers New York
• Bouas-Laurent, H., Dürr, H., (2001) Pure Appl. Chem., 73, pp. 639-665
• Paetzold, R., Ilge, H.D., (1984) J. Prakt. Chem., 326, pp. 705-848
• Yokoyama, Y., Goto, T., Inoue, T., Yokoyama, M., Kurita, Y., (1988) Chem. Lett., pp. 1049-1052
• Glaze, A.P., Heller, H.G., Whittal, J., (1992) J. Chem. Soc. Perkin Trans., 2, pp. 591-594
• Thematic issue on photochromism: Memories and switches (2000) Chem. Rev., 100, p. 1683
• Feringa, B.L., Van Delden, R.A., Koumura, N., Geertsema, E.M., (2000) Chem. Rev., 100, pp. 1789-1816
• Sackmann, E., (1971) J. Am. Chem. Soc., 93, pp. 7088-7090
• Janicki, S.Z., Schuster, G.B., (1995) J. Am. Chem. Soc., 117, pp. 8524-8527
• Feringa, B.L., Huck, N.P.M., van Doren, H.A., (1995) J. Am. Chem. Soc., 117, pp. 9929-9930
• Lee, H.-K., Doi, K., Harada, H., Tsutsumi, O., Kanazawa, A., Shiono, T., Ikeda, T., (2000) J. Phys. Chem. B, 104, pp. 7023-7028
• Yamaguchi, T., Inagawa, T., Nakazumi, H., Irie, S., Irie, M., (2000) Chem. Mater., 12, pp. 869-871
• Bossi, M.L., Aramendia, P.F., (2002) Photochem. Photobiol. Sci., 1, pp. 507-513
• Pieraccini, S., Donnoli, M.I., Ferrarini, A., Gottarelli, G., Licini, G., Rosini, C., Superchi, G.P., Spada, (2003) J. Org. Chem., 68, pp. 519-526. , Value informed by the provider. A chiral nematic phase can be seen as a layered structure with molecules oriented along an axis that helically twists across these layers. The pitch (q) of the twisted nematic phase is the distance between layers that have directors aligned in the same direction. The pitch determines the position of the reflection band characteristic of the twisted nematic phases, which arises on a Bragg-type diffraction. The concentration of the chiral inductor, C, determines the pitch through its helical twisting power (β); q = (Cβ)-1
• Thomas, C., Wolak, M., Birge, R., Lees, W., (2001) J. Org. Chem., 66, pp. 1914-1918
• Darcy, P., Heller, H., Strydom, P., Whittall, J., (1981) J. Chem. Soc. Perkin Trans., 1, pp. 202-205
• Allison, H., Gleeson, H.F., (1993) Liq. Cryst., 14, pp. 1469-1478
• Deniel, M., Lavabre, D., Micheau, J., (1999) Organic Photochromic and Thermochromic Compounds: Physicochemical Studies, Biological Applications and Thermochromism, 2, pp. 167-209. , J.C. Crano R.J. Guglielmetti Kluwer Academic/Plenum Publishers New York
• The differences in the initial and final values for the absorbance at 366 nm in Fig. 3 probably arise from the error introduced by mounting and dismounting the cell-holder for irradiation. In the UV the ITO-covered glass, the liquid crystal (ZLI) and the chiral inductor (S811) absorb. Also a background interference pattern due to the thin layer of the sample (see Figs 2 and 4), with amplitude in the range of the difference appointed in Fig. 3 and dependent on slight angle variations of the sample positioning, may contribute to the small single wavelength absorbance differences noticed. The absorbance at 492 nm was used for calculations of quantum yields and the concentration of the E isomer was inferred assuming that all the photochromic compound is either in one or the other isomer ([E] + [C] = c0). Full reversibility was always assessed by complete spectra, as those of Figs 2 and 4; Yokoyama, Y., Inoue, T., Yokoyama, M., Goto, T., Iwai, T., Kera, N., Hitome, I., Kurita, Y., (1994) Bull. Chem. Soc. Jpn., 67, pp. 3297-3303
• Kiji, J., Okano, T., Kitamura, H., Yokoyama, Y., Kubota, S., Kurita, Y., (1995) Bull. Chem. Soc. Jpn., 68, pp. 616-619
• A strong circular dichroism in the UV region is expected due to the presence of the chiral dopant at relatively high concentration. In fact, the signal saturates below 320 nm. The reflection band was also set in the NIR, far from the observed region, by adjusting the concentration of the chiral inductor (7% (w/w) in these samples); Saeva, F.D., Wysocki, J.J., (1971) J. Am. Chem. Soc., 93, pp. 5928-5929
• Hill, W., Mason, S., Peacock, R., (1977) J. Chem. Soc. Perkin, 2, pp. 1262-1268
• Dudley, R.J., Mason, S., Peacock, R., (1975) J. Chem. Soc. Faraday, 2, pp. 997-1007

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