J. Phys. IV France 7 (1997) C2-1267-C2-1268
XAS Study on Electron Transfer in Cobalt Complexes Containing Catecholate and Semiquinone LigandsJ.-C. Park1, D.-K. Kim2, O.-S. Jung3 and J.-H. Choy4
1 Department of Chemistry, Pusan Women's University, Pusan 617-736, Korea
2 Department of Chemistry, Kyungpook National University, Taegu 702-701, Korea
3 Inorganic Chemistry Laboratory, KIST, Seoul 136-791, Korea
4 Department of Chemistry, Center for Molecular Catalysis (CMC), Seoul National University, Seoul 151-742, Korea
XAFS measurements have been carried out at both room temperature and 100 K on complexes of general form of CoIII(N-N)(DBQ), where N-N is 1,l0-phenanthroline(phen), N,N,N'N'-tetramethylethlenediammine(tmeda), and DBQ is the 3,6- di-tert-butylcatechol or 3,6-di-tert-semiquinone ligands. Co K-edge XAFS spectra disclosed that Co(tmeda)(DBQ)2 is locked in a charge distribution of CoIII(tmeda)(3,6-DBSQ)(3,6-DBCat), while Co(phen)(DBQ)2 is accompanied by the transition of CoIII/CoIII dependent on temperature.
© EDP Sciences 1997