title: Novel photochromic spiroheterocyclic molecules via oxidation of 1,8-diaminonaphthalene.
abstract: [reaction: see text] Novel spiroheterocyclic molecules, namely, 2,3-dihydro-2-spiro-7'-[8'-imino-7',8'-dihydronaphthalen-1'-amine]perimidine, PNI, and 2,3-dihydro-2-spiro-4'-[8'-aminonaphthalen-1'(4H)-one]perimidine, PNO-p, were obtained by oxidation of 1,8-diaminonaphthalene using manganese dioxide. These molecules exhibit thermally reversible photochromism with good photofatigue resistance, and their photogenerated forms possess broad absorption in the visible region.
authors.affiliation: Molecular Smart System Group, Nanotechnology Research Institute, National Institute of Advanced Industrial Science and Technology, Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan.
authors.forename: Riju
authors.initials: R
authors.lastname: Davis
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Tamaoki