Abstract
Abstract In our preceding paper, we have reported that a Co complex, [CoIII-LS(tmeda)(3,5-DBSQ)(3,5-DBCat)]·0.5C6H5CH3, exhibits a photo-induced valence tautomerism. The photo-induced metastable state, [CoII-HS(tmeda)(3,5-DBSQ)2]·0.5C6H5CH3, has a back electron transfer band from CoII-HS to 3,5-DBSQ at around 800 nm, indicating that the valence tautomerism should be photo-reversible. In fact, we have found that the metastable state could be photo-pumped back to the original state by exciting the back electron transfer band. The process can be expressed as [ Co II-HS ( tmeda )(3,5 -DBSQ ) 2 ]·0.5 C 6 H 5 CH 3 ( metastable state )→[ Co III-LS ( tmeda )(3,5 -DBSQ )(3,5 -DBCat )]·0.5 C 6 H 5 CH 3 (ground state).
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