title: Methanol-Triggered Vapochromism Coupled with Solid-State Spin Switching in a Nickel(II)-Quinonoid Complex.
abstract: A highly methanol-selective vapochromic response has been realized in a NiII-quinonoid complex, [Ni(HLMe)2] (H2LMe=4-methylamino-6-methyliminio-3-oxocyclohexa-1,4-dien-1-olate) which exhibits a reversible structural transformation including a coordination geometrical change between the square-planar and octahedral structure by the selective uptake of methanol vapor. This was accompanied by a remarkable color change between purple and orange, as well as temperature-robust spin-state switching in the solid state under ambient conditions. It is remarkable that the properties are derived by the fine structural modification of the quinonoid ligand such as methyl or ethyl analogues. Such a system has high potential for applications in memory devices as well as chemical sensors and smart responsive materials.
authors.affiliation: Department of Chemistry, Faculty of Science, Hokkaido University, North-10 West-8, Kita-ku, Sapporo, Hokkaido, 060-0810, Japan.
authors.forename: Paramita
authors.initials: P
authors.lastname: Kar
authors.affiliation: Department of Chemistry, Faculty of Science, Hokkaido University, North-10 West-8, Kita-ku, Sapporo, Hokkaido, 060-0810, Japan.
authors.forename: Masaki
authors.initials: M
authors.lastname: Yoshida
authors.affiliation: Department of Chemistry, Faculty of Science, Hokkaido University, North-10 West-8, Kita-ku, Sapporo, Hokkaido, 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, Hokkaido, 060-0810, Japan.
authors.forename: Akane
authors.initials: A
authors.lastname: Usui
authors.affiliation: Department of Chemistry, Faculty of Science, Hokkaido University, North-10 West-8, Kita-ku, Sapporo, Hokkaido, 060-0810, Japan.
authors.forename: Atsushi
authors.initials: A
authors.lastname: Kobayashi
authors.affiliation: Department of Physics, Faculty of Science, Hokkaido University, North-10 West-8,Kita-ku, Sapporo, Hokkaido, 060-0810, Japan.
authors.forename: Takaaki
authors.initials: T
authors.lastname: Minamidate
authors.affiliation: Department of Physics, Faculty of Science, Hokkaido University, North-10 West-8,Kita-ku, Sapporo, Hokkaido, 060-0810, Japan.
authors.forename: Noriaki
authors.initials: N
authors.lastname: Matsunaga
authors.affiliation: Department of Chemistry, Faculty of Science, Hokkaido University, North-10 West-8, Kita-ku, Sapporo, Hokkaido, 060-0810, Japan.
authors.forename: Masako
authors.identifier: 0000-0002-6932-9758
authors.initials: M
authors.lastname: Kato
keywords: methanol; nickel complexes; solid-phase geometrical transformation; spin-state switching; vapochromism