4.7 Article

Photoinduced and Thermal Linkage Isomerizations of an Organometallic Ionic Liquid Containing a Half-Sandwich Ruthenium Thiocyanate Complex

Journal

INORGANIC CHEMISTRY
Volume 60, Issue 16, Pages 12386-12391

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.1c01613

Keywords

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Funding

  1. KAKENHI from the Japan Society for the Promotion of Science (JSPS) [20H02756]
  2. Japan Society for the Promotion of Science (JSPS) [21 J12056]

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A study was conducted to explore ionic liquids with stimuli-responsiveness based on linkage isomerization, resulting in the synthesis of an ionic liquid containing a cationic half-sandwich thiocyanate complex. The N- and S-coordinated isomers showed small solvatochromic absorption shifts in organic solvents, with different solvent dependencies observed for each isomer.
Metal complexes with thiocyanate (SCN-) ligands typically exhibit S-or N-coordinated linkage isomers. In this study, to explore ionic liquids that exhibit stimuli-responsiveness based on linkage isomerization, we synthesized an ionic liquid containing a cationic half-sandwich thiocyanate complex, [Ru(C6H6)(NCS)L]Tf2N (L = N-hexyl-2-pyridinemethanimine, Tf2N = bis(trifluoromethanesulfonyl)amide anion). The as-synthesized ionic liquid was a 0.7:0.3 mixture of N- and S-coordinated isomers, presenting as an extremely viscous liquid exhibiting a glass transition at 0 degrees C. Isomerization from the N- to the S-coordinated isomer occurred upon UV photoirradiation or heating, although thermal isomerization was accompanied by significant decomposition. The N- and S-coordinated isomers were separated into brown and orange liquids, respectively, using gel permeation chromatography. Each isomer exhibited a small solvatochromic absorption shift in organic solvents, with different solvent dependences observed for the two isomers.

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