Jeon, S Lee, H Lee, HK Choi, YK Jung, OS 2024-01-21T17:15:58Z 2024-01-21T17:15:58Z 2021-09-04 1998-02-20 0253-2964 https://pubs.kist.re.kr/handle/201004/143234 The electrochemistry and valence tautomerism of Co-III(N-N)(SQ)(Cat), [N-N=N,N,N',N'-tetramethylethylenediamine (TMEDA); SQ=3,5- or 3,6-di-tert-butyl-semiquinone, Cat=3,5- or 3,6-di-tert-butyl-catechol], have been investigated by spectroscopic, electrochemical, spectroelectrochemical methods in nonaqueous solvents under anaerobic condition. The transition temperature between tautomers is dependent upon the donation effect of substituted quinone ligand and solvent. It increases with the increase of donation effect of solvent and quinone ligand. Co-III(TMEDA)(SQ)(Cat) is reduced to [Co-II(TMEDA)(SQ)(Cat)](-), and then reduces to [Co-II(TMEDA) (Cat)(2)](2-). Co-III(TMEDA)(SQ)(Cat) is oxidized to [Co-III(TMEDA)(SQ)(2)](+), but the stability of the oxidized form in DMF is dependent upon the solution temperature. With the increase of solution temperature the oxidized form may be converted to [Co-II(TMEDA)(SQ)(BQ)](+) by intramolecular electron transfer from SQ ligand to Co-III. English KOREAN CHEMICAL SOC METAL-CATECHOL COMPLEXES LIGAND ELECTRON-TRANSFER APROTIC MEDIA 3,5-DI-TERT-BUTYLCATECHOLATO COMPLEXES SEMIQUINONE BISTABILITY SERIES Redox chemistry and valence tautomerism of cobalt-quinone complexes in nonaqueous solvents Article 1 BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.19, no.2, pp.212 - 217 BULLETIN OF THE KOREAN CHEMICAL SOCIETY 19 2 212 217 scie scopus 000072523300018 2-s2.0-0032342514 Chemistry, Multidisciplinary Chemistry Article METAL-CATECHOL COMPLEXES LIGAND ELECTRON-TRANSFER APROTIC MEDIA 3,5-DI-TERT-BUTYLCATECHOLATO COMPLEXES SEMIQUINONE BISTABILITY SERIES 산화환원화학