Influence of Pt—Cl force constants on the Raman lineshapes in Pt35Cl/37Cl chains

The influence of the 35 Cl/37 Cl isotopic disorder of natural chlorine on the Raman and infrared lineshapes of the vibrational modes in PtCl chains was calculated as a function of the interionic force constants in a one-dimensional model. It is shown that the fine structure of the Raman line is strongly dependent of the Pt3+σ-Cl and Pt3-σ-Cl force constants, and so it can be used to estimate the charge disproportion σ. From the case of [Pt(en)2][Pt(en)2Cl2](ClO4)4 it appears that the description of the high-wavenumber infrared line (v2) requires one to take into account interactions with more distantations. It is also shown that the intensity of the lowwavenumber infrared-active mode (v3) is so weak that the corresponding line may have never been observed.

[1]  Wilkins,et al.  Tuning of the charge-density wave in the halogen-bridged transition-metal linear-chain compounds. , 1993, Physical review letters.

[2]  M. Yamashita,et al.  Photoinduced Near-Infrared Absorption in an M-X Chain Complex [Pt(en)2][Pt(en)2Cl2](ClO4)4, en=ethyl , 1993 .

[3]  S. C. Huckett,et al.  Effects of temperature on the crystal and molecular structure of the mixed-valence linear chain bis(ethylenediamine)platinum bis(ethylenediamine)dihaloplatinum tetraperchlorate (halo = chloro, bromo) , 1993 .

[4]  M. Alouani,et al.  Ground-state properties of the PtBr neutral Mx chain compound , 1993 .

[5]  I. Batistić,et al.  Ionic interaction in a platinum chloride linear chain : PtCl , 1993 .

[6]  S. C. Huckett,et al.  Far-infrared and resonance raman spectroscopy and isotopic substitution studies of halogen-bridged platinum chain solids , 1993 .

[7]  S. C. Huckett,et al.  Resonance Raman and far-infrared studies of isotopically disordered and mixed-halide halogen-bridged platinum chain solids , 1993 .

[8]  Swanson,et al.  Origin of the fine structure in the vibrational spectrum of , 1992, Physical Review B (Condensed Matter).

[9]  Arrington,et al.  Photoinduced defects in the bromide-bridged platinum linear chain , 1992, Physical review. B, Condensed matter.

[10]  B. Swanson,et al.  Polarons and bipolarons in weak 1-D CDW solids: Spectral studies of local states in [PtII(en)2][PtIV(en)2Br2](CIO4)4 and [PtIV(en)2I2](CIO4)4 , 1991 .

[11]  B. Swanson,et al.  Phenomenological description of the longitudinal vibrations of the quasi-one-dimensional solid PtCl: calculation of the valence defect frequencies , 1991 .

[12]  Wachter,et al.  Phonons in one-dimensional Peierls-Hubbard systems. , 1990, Physical Review B (Condensed Matter).

[13]  B. Swanson,et al.  Resonance Raman evidence for electron and hole defect asymmetry in the quasi-one-dimensional mixed-valence solid [PtII(en)2][PtIV(en)2Cl2][ClO4]4 (en = ethylenediamine) , 1990 .

[14]  B. Swanson,et al.  Studies of mixed-valence linear-chain complexes crystallized at elevated pressures. Crystal structures of (Pt(en) sub 2 )(Pt(en) sub x X sub 2 )(ClO sub 4 ) sub 4 (X = Br, I) , 1990 .

[15]  D. Baeriswyl,et al.  Localised polaronic states in mixed-valence linear chain complexes , 1988 .

[16]  M. Tanaka,et al.  Fine structures of the resonant Raman spectra in quasi-one-dimensional crystals of halogen-bridged mixed-valence platinum compounds , 1986 .

[17]  Jeremy R. Campbell,et al.  Electronic Spectra and Resonance Raman Spectra of Mixed-Valence Linear-Chain Complexes of Platinum with 1,2-Diaminoethane , 1978 .