Relaxation of Electron-Phonon System in Optically Excited Quasi-1-D Mixed Valence Crystal Wolffram's Red Salt

Halogen‐Bridged PtII/PtIV Mixed‐Valence Ladder Compounds

“…The MX‐chain compounds with a mixed‐valence structure ‐X⋅⋅⋅M 2+ ⋅⋅⋅X‐M 4+ ‐ (M=Pd, Pt; X=Cl, Br, I) have been extensively studied as 1D materials with strong electron–phonon interactions (S). Their Peierls‐distorted 1D compounds show unique optical and dynamical properties such as progressive overtones in resonance Raman spectra12 and luminescence with a large Stokes shift,13 as well as the long‐range migration of spin solitons and polarons along 1D chains 14…”

One‐Dimensional Bromo‐Bridged NiIII Complexes [Ni(S,S‐bn)2Br]Br2 (S,S‐bn=2S,3S‐diaminobutane): Synthesis, Physical Properties, and Electrostatic Carrier Doping

“…[3] Since the discovery of Wolfframs red salt, [Pt- 4 ]Cl 4 , quasi-1D halogen-bridged complexes have attracted much attention from chemists and physicists because they exhibit marked physical properties, such as intense and dichroic intervalence charge-transfer bands, [4] progressive overtones of resonance Raman spectra, [5] luminescence spectra with large Stokes shifts, [6] gigantic third-order nonlinear optical properties, [7] and midgap absorptions attributable to solitons and polarons. [8] The electronic states of these M À X chains are recognized as Peierls-Hubbard systems, in which electron-phonon interaction (S), electron transfer (T), and on-site and neighboring-site Coulomb repulsion energies (U and V, respectively) compete or cooperate with each other.…”

Solitons, polarons and their dynamics in mixed-valence halogen-bridged MX-chains

“…One-dimensional (1D) halogen-bridged metal complexes (MX-chains) have attracted much attention from many chemists and physicists owing to the variety of their electronic states and their many attractive physical properties such as intense charge transfer bands (Tanaka et al 1984;Wada et al 1985), overtone progressions in the resonance Raman spectra (Clark et al 1976;Campbell et al 1978;Clark 1984Clark , 1990, intense luminescence spectra with large Stokes shifts (Tanino & Kobayashi 1983), photo-generation (Okamoto et al 1992) and long-range migration (Kimura et al 1998) of solitons and polarons, and large third-order optical nonlinearity (Kishida et al 2000). They also provide 1D model compounds of high T c copper oxide superconductors.…”