On‐Demand Control of Short‐Wave Infrared Light Transparency Based on Stimuli‐Responsive Association of Tetrathiafulvalene Radical Cations

Author:

Suzuki Shuichi1ORCID,Sakai Toshihiro1,Takagi Sota1,Naota Takeshi1ORCID

Affiliation:

1. Department of Chemistry, Graduate School of Engineering Science Osaka University Toyonaka Osaka 560–8531 Japan

Abstract

AbstractThe light‐transmissive properties of a solid‐state tetrathiafulvalene radical cation‐bis(trifluoromethanesulfonyl)imide, 1‐C5+ ⋅ NTf2, underwent instantaneous changes in the short‐wave infrared (SWIR) region (1000–2500 nm) upon exposure to solvent vapor or the application of mechanostress at room temperature. The initial solid state of 1‐C5+ ⋅ NTf2 exhibited strong absorption in the near‐infrared (NIR; 700–1000 nm) and SWIR regions, whereas the absorption in the SWIR region was significantly diminished in the stimulated state induced by dichloromethane vapor. Upon cessation of vapor stimulation, the solid state spontaneously and promptly reverted to its original state, characterized by absorption bands in the NIR/SWIR region. Moreover, the SWIR absorption was absent upon the application of mechanical stress using a steel spatula. The reversal was fast and occurred within 10 s. These changes were visualized using a SWIR imaging camera under 1450‐nm light irradiation. Experimental investigations demonstrated that the transparency to the SWIR light in the solid states was modulated through significant structural transformations of the associated radical cations, with transitions between columnar and isolated π‐dimer structures under ambient and stimulated conditions, respectively.

Funder

Japan Society for the Promotion of Science

Publisher

Wiley

Subject

General Chemistry,Catalysis

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