title: Unprecedented radical-radical reaction of a [2.2]paracyclophane derivative containing an imidazolyl radical moiety.
abstract: Pseudogem-DPIM-DPI[2.2]PC dimer (3), with a C-N bond between the [2.2]paracyclophane ([2.2]PC) moiety and the imidazole ring, was synthesized. This is the first crystallographic observation of a highly sterically constrained 1-ene-2,5-cyclohexadiene structure for a [2.2]PC derivative. Compound 3 shows a photochromic behavior, exhibiting a color change from pale yellow to green upon either UV or visible light irradiation, both in the solid state and in solution at room temperature.
authors.affiliation: Department of Chemistry, School of Science and Engineering, Aoyama Gakuin University, 5-10-1 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5258, Japan.
authors.forename: Sayaka
authors.initials: S
authors.lastname: Hatano
authors.forename: Ken
authors.initials: K
authors.lastname: Sakai
authors.forename: Jiro
authors.initials: J
authors.lastname: Abe