Photoinduced Absorption Spectra of Halogen-bridged Binuclear Metal Complexes: Possible Contrast between R₄[Pt₂(P₂O₅H₂)₄X]·nH₂O and Pt₂(CH₃CS₂)₄I

Abstract

The optical conductivity of photogenerated solitons in quasi-one-dimensional halogen-bridged binuclear metal (MMX) complexes is investigated with particular emphasis on a comparison between the two family compounds R₄[Pt₂(pop)₄X]·nH₂O (X=Cl, Br, I; R=NH₄, Na, K, …; pop = diphosphonate = P₂O₅H₂²⁻) and Pt₂(dta)₄I (dta = dithioacetate = CH₃CS₂⁻). Soliton-induced absorption spectra for the pop complexes should split into two bands, while those for the dta complex should consist of a single band.