title: Rational molecular designs for drastic acceleration of the color-fading speed of photochromic naphthopyrans.
abstract: We report rational molecular designs for acceleration of the color-fading speed of photochromic 3H-naphthopyrans. By using steric and electrostatic repulsions induced by substituents at the 2- and 10-positions of 3H-naphthopyrans, the color-fading speed accelerates from tens of minutes to microsecond time scales. The long-lived residual color, which is an important problem to be solved for industrial applications, can also be suppressed by these strategies.
authors.affiliation: Department of Chemistry, School of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5258, Japan. jiro_abe@chem.aoyama.ac.jp.
authors.forename: Katsutoshi
authors.initials: K
authors.lastname: Arai
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Kobayashi
authors.forename: Jiro
authors.initials: J
authors.lastname: Abe