Robust Triplatinum Redox‐Chromophore for a Post‐Synthetic Color‐Tunable Electrochromic System. Issue 32 (26th April 2019)

• Record Type: Journal Article
• Authors: Yoshida, Masaki; Shitama, Hotaka; Sameera, W. M. C.; Kobayashi, Atsushi; Kato, Masako
• Is Part Of: Chemistry. Volume 25:Issue 32(2019)
• Page Start: 7669
• Page End: 7678
• Publication Date: 2019-04-26
• Subjects: electrochromism -- electronic structure -- metal–metal interactions -- platinum -- trinuclear complexes; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201900713
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: An electrochromic system showing ease of color tunability has been constructed using a triple‐decker Pt II complex [Pt3 (μ3 ‐pydt)2 (bpy)3 ] 2+ (H2 pydt=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 [Pt3 X2 (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. Abstract : An electrochromic system offering ease of color tunability has been constructed using a triple‐decker Pt II complex. The color of this chromophore could be post‐synthetically tuned from red to purple, blue, and cyan by the trans influence of axial halide ligands (see graphic). This novel strategy of post‐synthetic color‐tuning should enable the facile preparation of colorful electrochromic devices without any complicated procedures.