Redox-triggered reversible modulation of intense near-infrared and visible absorption using a paddlewheel-type diruthenium(III) complex

Yusuke Kataoka; Nanako Imasaki; Natsumi Yano; Minoru Mitsumi; Makoto Handa

doi:10.1039/d1dt01681d

Redox-triggered reversible modulation of intense near-infrared and visible absorption using a paddlewheel-type diruthenium(III) complex

Dalton Trans. 2021 Jul 13;50(27):9547-9553. doi: 10.1039/d1dt01681d.

Authors

Yusuke Kataoka¹, Nanako Imasaki¹, Natsumi Yano², Minoru Mitsumi³, Makoto Handa¹

Affiliations

¹ Department of Chemistry, Graduate School of Natural Science and Technology, Shimane University, 1060, Nishikawatsu, Matsue, Shimane 690-8504, Japan. kataoka@riko.shimane-u.ac.jp.
² Special Course in Science and Engineering, Graduate School of Natural Science and Technology, Shimane University, 1060, Nishikawatsu, Matsue, Shimane 690-8504, Japan.
³ Department of Chemistry, Faculty of Science, Okayama University of Science, 1-1, Ridaicho, Kita-ku, Okayama, 700-0005, Japan.

PMID: 34156048
DOI: 10.1039/d1dt01681d

Abstract

A new paddlewheel-type diruthenium complex with 2-amino-3-(trifluoromethyl)pyridine (amtfmp) [Ru2(amtfmp)4Cl2] ([1]), which shows intense and characteristic near-infrared (NIR) and visible absorption, has been developed and structurally characterized by single crystal X-ray diffraction (SCXRD) analyses. This complex exhibits reversible and dramatic NIR and visible electrochromic behavior from deep-blue ([1]) to pink ([1]-) due to the ON-OFF switching of its characteristic ligand-to-metal charge transfer (LMCT) and d-d absorption bands in response to an external voltage or chemical reagent such as decamethylcobaltocene (CoCp*2). The one-electron reduced species of [1], i.e., [CoCp*2][1], was successfully isolated and fully characterized via SCXRD, the temperature dependence of the magnetic susceptibility, and mass spectroscopy, proving that this electrochromic behavior occurs without significant structural reorganization of [1].