Photo-Induced Absorption Band in One-Dimensional Halogen-Bridged Mixed-Valence Platinum Complex:〔Pt(en)2〕〔PtI2(en)2〕(SO4)2・6H2O and its Au-Doped Complex:〔AuxPt1-xI(en)2〕SO4・3H2O

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  • Photo-Induced Absorption Band in One-Dimensional Halogen-Bridged Mixed-Valence Platinum Complex: [Pt(en)<SUB>2</SUB>][PtI<SUB>2</SUB>(en)<SUB>2</SUB>](SO<SUB>4</SUB>)<SUB>2</SUB>·6H<SUB>2</SUB>O and its Au-Doped Complex: [Au<I><SUB>x</SUB></I>Pt<SUB>1−<I>x</I></SUB>I(en)<SUB>2</SUB>]SO<SUB>4</SUB>·3H<SUB>2</SUB>O
  • Photo Induced Absorption Band in One Di
  • Photo-Induced Absorption Band in One-Dimensional Halogen-Bridged Mixed-Valence Platinum Complex: [Pt(en)<sub>2</sub>][PtI<sub>2</sub>(en)<sub>2</sub>](SO<sub>4</sub>)<sub>2</sub>·6H<sub>2</sub>O and its Au-Doped Complex: [Au<sub><i>x</i></sub>Pt<sub>1-<i>x</i></sub>I(en)<sub>2</sub>]SO<sub>4</sub>·3H<sub>2</sub>O

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The intervalence charge-transfer absorption spectra in the mixed-valence complexes [Pt(en)2][PtI2(en)2](SO4)2·6H2O and [AuxPt1−xI(en)2]SO4·3H2O (x=0.03) have been investigated at 4.2 K. In these complexes, below the charge-transfer absorption edge, a weak absorption band (A-band) has been observed for the light polarized parallel to the chain axis. When these complexes were irradiated with the light in the region of the charge-transfer transition from PtII to PtIV, the absorption coefficient of the A-band increased remarkably, which implies that the A-band is a photo-induced absorption band. The photo-induced effect for the A-band in [AuxPt1−xI(en)2]SO4·3H2O (x=0.03) is more intense than that in [Pt(en)2][PtI2(en)2](SO4)2·6H2O. The A-band suggests the existence of new excitations such as a soliton-like excitation in the electronic state of the platinum chains.

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