title: Shape-Memory Platinum(II) Complexes: Intelligent Vapor-History Sensor with ON-OFF Switching Function.
abstract: A novel platinum(II)-diimine complex, [Pt(CN)2 (H2 dcphen)] (1; H2 dcphen=4,7-dicarboxy-1,10- phenanthroline), was synthesized and its vapochromic shape-memory behavior was evaluated. The as-synthesized amorphous purple solid, [Pt(CN)2 (H2 dcphen)]⋅2 H2 O (1 P), exhibited vapochromic behavior in the presence of alcoholic vapors through transformation to a red, crystalline, porous, vapor-adsorbed form, 1 R⊃vapor. The obtained 1 R⊃vapor complex released the adsorbed vapors upon heating without collapse of the porous structure. The vaporfree, porous 1 R⊃open could detect water or n-hexane vapor, although these vapors could not induce 1 P-to-1 R⊃vapor transformation, and 1 R⊃open could easily be converted to the initial 1 P by manual grinding. These results indicate that 1 is a new shape-memory material that functions through formation and collapse of the porous framework with an emission change upon vapor-adsorption and grinding; this enables it to exhibit vapor history and ON-OFF switching sensing functions.
authors.affiliation: Department of Chemistry, Faculty of Science, Hokkaido University, North-10 West-8, Kita-ku, Sapporo, 060-0810, Japan.
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Shigeta
authors.affiliation: Department of Chemistry, Faculty of Science, Hokkaido University, North-10 West-8, Kita-ku, Sapporo, 060-0810, Japan. akoba@sci.hokudai.ac.jp.|PRESTO, Japan Science and Technology Agency (JST), Kawaguchi, Saitama, 332-0012, Japan. akoba@sci.hokudai.ac.jp.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Kobayashi
authors.affiliation: Department of Chemistry, Faculty of Science, Hokkaido University, North-10 West-8, Kita-ku, Sapporo, 060-0810, Japan.|Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan.
authors.forename: Tadashi
authors.initials: T
authors.lastname: Ohba
authors.affiliation: Department of Chemistry, Faculty of Science, Hokkaido University, North-10 West-8, Kita-ku, Sapporo, 060-0810, Japan.
authors.forename: Masaki
authors.initials: M
authors.lastname: Yoshida
authors.affiliation: Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Matsumoto
authors.affiliation: Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan.
authors.forename: Ho-Chol
authors.initials: HC
authors.lastname: Chang
authors.affiliation: Department of Chemistry, Faculty of Science, Hokkaido University, North-10 West-8, Kita-ku, Sapporo, 060-0810, Japan. mkato@sci.hokudai.ac.jp.
authors.forename: Masako
authors.initials: M
authors.lastname: Kato
keywords: chromophores; mechanochromism; platinum; shape-memory effects; vapochromism