Abstract
Single crystals of 1D halogen-bridged binuclear platinum complex, K 4[Pt 2(pop) 4Cl]·3H 2O, where pop=P 2O 5H 2 2−, have been investigated by defused X-ray scattering, reflectivity and luminescence measurements. Compared with the halogen-bridged mononuclear metal complexes, several unusual behaviors are observed, which are responsible for an additional charge modulation in the charge density wave state. From the viewpoint of the extended Peierls-Hubbard model, they are reduced to the result of a competition between the electron-electron repulsive energy in binuclear Pt-Pt sites and the energy gain due to chlorine ion displacement.
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