Shape‐Memory Platinum(II) Complexes: Intelligent Vapor‐History Sensor with ON–OFF Switching Function. Issue 8 (4th December 2015)

• Record Type: Journal Article
• Authors: Shigeta, Yasuhiro; Kobayashi, Atsushi; Ohba, Tadashi; Yoshida, Masaki; Matsumoto, Takeshi; Chang, Ho‐Chol; Kato, Masako
• Is Part Of: Chemistry. Volume 22:Issue 8(2016)
• Page Start: 2682
• Page End: 2690
• Publication Date: 2015-12-04
• Subjects: chromophores -- mechanochromism -- platinum -- shape-memory effects -- vapochromism; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201503247
• Languages: English
• ISSNs: 0947-6539

Abstract

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 obtained1 R⊃vapor complex released the adsorbed vapors upon heating without collapse of the porous structure. The vaporfree, porous1 R⊃open could detect water or n ‐hexane vapor, although these vapors could not induce1 P ‐to‐1 R⊃vapor transformation, and1 R⊃open could easily be converted to the initial1 P by manual grinding. These results indicate that1 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. Abstract : Molecule‐based shape‐memory behavior of a newly synthesized Pt II complex, [Pt(CN)2 (H2 dcphen)] (H2 dcphen=4, 7‐ dicarboxy‐1, 10‐phenanthroline), is reported. A three‐dimensional flexible network constructed of one‐dimensional intermolecular Pt⋅⋅⋅Pt interactions and two‐dimensional hydrogen bonds enables the complex to exhibit not only vapor‐history sensing functions, but also ON–OFF switching of the vapor sensing function (see scheme; G1 and G2 represent guest molecules).