Photo-Induced Absorption Band in One-Dimensional Halogen-Bridged Mixed-Valence Platinum Complex:[Pt (en)_2][PtI_2(en)_2](SO_4)_2・6H_2O and its Au-Doped Complex:[Au_xPt_<1-x>I (en)_2]SO_4・3H_2O

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The intervalence charge-transfer absorption spectra in the mixed-valence com-plexes [Pt(en).] [PtI.(en).](SQ.).?6H.0 and [Au.Pt. .1(en).]S0.=3H.O (,v=0.03) havebeen investigated at 4.2 K. In these complexes, below the charge-transfer absorptionedge, a weak absorption band (.4-band) has been observed for the light polarizedparallel to the chain axis. When these complexes were irradiated with the light in theregion of the charge-transfer transition from Pt" to Pt", the absorption coefficient ofthe ,4-band increased remarkably, which implies that the ,4-band is a photo-inducedabsorption band. The photo-induced effect for the .4-band in [Au.Pt. .1(en).1SO.- 3H.0 (,X'=O.03) is more intense than that in [Pt(en).1 [PtI.(en).1(SQ.).? 6H.0. The.4-band suggests the existence of new excitations such as a soliton-like excitation inthe electronic state of the platinum chains.[platinum complex, mixed-valence, one-dimensional complex,charge-transfer ab- ll sorption band, photo-induced effect, Au-doping effect.l
社団法人日本物理学会の論文
1987-11-15