title: Multiple optical properties of a naphthoquinone pigment: 2-methyl-3-(hydroxyphenylthio)-1,4-naphthalenedione.
abstract: Naphthoquinone pigments 2-methyl-3-(4- or 2-hydroxyphenylthio)-1,4-naphthalenedione show characteristic optical properties in solution and in the solid state. The position of the OH group in the pigment leads to varied optical properties, including a characteristic colour, in the solid state. The pigment with a 2-OH substituent displays solvatochromism in solution, and that with a 4-OH substituent displays optical chirality in the solid state.
authors.affiliation: Department of Applied Chemistry, Faculty of Science and Engineering, Kinki University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan. y-imai@apch.kindai.ac.jp.
authors.forename: Hirotaka
authors.initials: H
authors.lastname: Akiyama
authors.forename: Takafumi
authors.initials: T
authors.lastname: Inoue
authors.forename: Nobuo
authors.initials: N
authors.lastname: Tajima
authors.forename: Reiko
authors.initials: R
authors.lastname: Kuroda
authors.forename: Yoshitane
authors.initials: Y
authors.lastname: Imai