Robust Triplatinum Redox-Chromophore for a Post-Synthetic Color-Tunable Electrochromic System |
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| Authors: | Dr Masaki Yoshida Hotaka Shitama Dr W M C Sameera Dr Atsushi Kobayashi Prof Dr Masako Kato |
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| Institution: | Department of Chemistry, Faculty of Science, Hokkaido University, North-10 West-8, Kita-ku, Sapporo, Hokkaido, 060–0810 Japan |
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| Abstract: | An electrochromic system showing ease of color tunability has been constructed using a triple-decker PtII complex Pt3(μ3-pydt)2(bpy)3]2+ (H2pydt=2,6-pyridinedithiol, bpy=2,2′-bipyridine). The divalent complex undergoes electrochemically quasi-reversible two-electron transfer coupled with the coordination/dissociation of axial ligands, forming higher valent Pt(+2.67) species Pt3X2(μ3-pydt)2(bpy)3]2+ (X=Cl−, Br−, and SCN−). These higher valent species exhibit characteristic colors ranging from red to cyan depending on the counter anion X− of the electrolyte. The triple-decker structure provides a novel multicolor electrochromic system with favorable stability and reversibility. Theoretical calculations indicate that the colors of the Pt(+2.67) species are tunable by the trans influence of the axial ligand X−. This novel strategy of post-synthetic color-tuning using triplatinum systems should enable the facile preparation of colorful electrochromic devices without any complicated procedures, which may find application in flexible displays, optical devices, and sensors. |
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| Keywords: | electrochromism electronic structure metal–metal interactions platinum trinuclear complexes |
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