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Structure of a Pt(II)-Pt(IY) Mixed-Valence Linear Chain Complex: Bis (1,2-diaminopropane)platinum(II)bis (1,2-diaminepropane) - dibromoplatinum(IV)tetraperchlorate
- Cannas, M., Marongiu, G., Martin, R., Keller, H. J.
- Zeitschrift für Naturforschung 2014 v.38 no.11 pp. 1346-1350
- cations, least squares, perchlorates, platinum
- [Pt(C₃H₁₀N₂)₂][Pt(C₃H₁₀N₂)₂Br₂](ClO₄)₄ crystallizes as flat orthorhombic needles with cell dimensions: a = 7.74(1); b = 11.14(2); c = 19.42(3) Å, Z = 1. Since rotation photographs showed diffuse patterns corresponding to odd values of k without any Bragg reflections, the subcell for which b = 5.57(1) Å was adopted for the structural analysis; it has systematic absences consistent with space groups Pc 2 a and Pcma; the structure was refined in both space groups by least squares and difference Fourier syntheses to R = 0.062 in Pc 2a and R = 0.064 in Pcma. A final decision between the two space groups proved to be impossible within the scope of the experiment. An analysis of the “diffuse” layers reveals that the bridging bromines vibrate in a one-dimensional collective mode within a lattice of “uniform”, fixed platinum cations.