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47. Yonekawa I, Mutoh K, Kobayashi Y, Abe J (2018) Intensity-dependent photoresponse of biphotochromic molecule composed of a negative and a positive photochromic unit. J Am Chem Soc
140:1091–1097
48. Hatano S, Horino T, Tokita A, Oshima T, Abe J (2013) Unusual negative photochromism via
a short-lived imidazolyl radical of 1,1 -binaphthyl-bridged imidazole dimer. J Am Chem Soc
135:3164–3172
49. Yamaguchi T, Kobayashi Y, Abe J (2016) Fast negative photochromism of 1,1 -binaphthylbridged phenoxyl-imidazolyl radical complex. J Am Chem Soc 138:906–913
50. Lenoble C, Becker RS (1986) Photophysics, photochemistry and kinetics of photochromic
2H-pyrans and chromenes. J Photochem 33:187–197
51. Crano JC, Guglielmetti R (1999) Organic photochromic and thermochromic compounds, vol
1. Plenum Press, New York
52. Kim SH (2006) Functional dyes. Elsevier, Amsterdam
53. Sousa CM, Pina J, de Melo JS, Berthet J, Delbaere S, Coelho PJ (2011) Preventing the formation
of the long-lived colored transoid-trans photoisomer in photochromic benzopyrans. Org Lett
13:4040–4043
54. Bergamini G, Silvi S (2016) Applied photochemistry, when light meets molecules. Springer
International Publishing, Switzerland
55. Pozzo JL, Lokshin VA, Guglielmetti R (1994) New photochromic 2,2-diphenyl-[2H]chromenes annellated with nitrogenated six-membered ring. Mol Cryst Liq Cryst Sci Technol,
Sect A 246:75–78
56. Inagaki Y, Kobayashi Y, Mutoh K, Abe J (2017) A simple and versatile strategy for rapid
color fading and intense coloration of photochromic naphthopyran families. J Am Chem Soc
139:13429–13441
J. Abe et al.
47. Yonekawa I, Mutoh K, Kobayashi Y, Abe J (2018) Intensity-dependent photoresponse of biphotochromic molecule composed of a negative and a positive photochromic unit. J Am Chem Soc
140:1091–1097
48. Hatano S, Horino T, Tokita A, Oshima T, Abe J (2013) Unusual negative photochromism via
a short-lived imidazolyl radical of 1,1 -binaphthyl-bridged imidazole dimer. J Am Chem Soc
135:3164–3172
49. Yamaguchi T, Kobayashi Y, Abe J (2016) Fast negative photochromism of 1,1 -binaphthylbridged phenoxyl-imidazolyl radical complex. J Am Chem Soc 138:906–913
50. Lenoble C, Becker RS (1986) Photophysics, photochemistry and kinetics of photochromic
2H-pyrans and chromenes. J Photochem 33:187–197
51. Crano JC, Guglielmetti R (1999) Organic photochromic and thermochromic compounds, vol
1. Plenum Press, New York
52. Kim SH (2006) Functional dyes. Elsevier, Amsterdam
53. Sousa CM, Pina J, de Melo JS, Berthet J, Delbaere S, Coelho PJ (2011) Preventing the formation
of the long-lived colored transoid-trans photoisomer in photochromic benzopyrans. Org Lett
13:4040–4043
54. Bergamini G, Silvi S (2016) Applied photochemistry, when light meets molecules. Springer
International Publishing, Switzerland
55. Pozzo JL, Lokshin VA, Guglielmetti R (1994) New photochromic 2,2-diphenyl-[2H]chromenes annellated with nitrogenated six-membered ring. Mol Cryst Liq Cryst Sci Technol,
Sect A 246:75–78
56. Inagaki Y, Kobayashi Y, Mutoh K, Abe J (2017) A simple and versatile strategy for rapid
color fading and intense coloration of photochromic naphthopyran families. J Am Chem Soc
139:13429–13441