Studies on partially oxidised one-dimensional bis(oxalato)platinate salts containing divalent cations |
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| Authors: | David M. Watkins Allan E. Underbill Claus S. Jacobsen |
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| Affiliation: | School of Physical and Molecular Sciences, University College of North Wales, Bangor, Gwynedd, LL57 2UW, Wales, UK;Physics Laboratory III, Technical University of Denmark, DK-2800 Lyngby, Denmark |
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| Abstract: | The preparation and electrical conduction properties of the isostructural one-dimensional conductors Ni0.84[Pt(C2O4)2]·6H2O(Ni-OP) and Mn0.81[Pt(C2O4)2]·6H2O(Mn-OP) are described. Ni-OP exhibits a similar tem dependence of conductivity to the isostructural compounds Co0.83[Pt(C2O4)2]·6H2O(Co-OP) and Zn0.81[Pt(C2O4)2]·6H2O whereas the behaviour of Mn-OP is rather like that of K2[Pt(CN)4]Br0.3·3H2O. These differences are discussed in terms of the variation from compound to compound of the critical temperature for the formation of the “non-Peierls” superstructure (Tc) and the temperature at which the CDW/PD on adjacent conducting chains undergo three-dimensional ordering (T3D). The variation of thermopower with temperature for Co-OP and Mg0.82[Pt(C2O4)2]·6H2O is reported and related to the conduction properties and phase changes which have been observed for these compounds. For the isostructural series M0.8[Pt(C2O4)2]·6H2O (M = Mg, Mn, Co, Ni or Zn) the variation of (T3D) from compound to compound is related to differences in the polarizing power of the cations. |
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