Electron localization in one-dimensional disordered systems: K2Pt(CN)4Br0.3·xH2O and quinolinium (TCNQ)2⨪ and ⨥

One‐Dimensional Inorganic Complexes

“…Physical Properties. The physical properties of K Z P~( C N )~X~.~( H Z O )~-(X = C1, Br) have been extensively analyzed in terms of several models for highly conducting one-dimensional systems undergoing a metal-insulator transition including interrupted strands (120,173,253,344,345,346,434) and disorder dominated transport (50,51,336,472). These materials are currently best understood in terms of the physical model of a band conductor undergoing a Peierls transition (433) to a semiconductor as the temperture is lowered (433) with evidence for the presence of a pinned charge density wave (Frohlich collective mode) below 200°K (457).…”

Low-Temperature Specific Heat of One-DimensionalK2Pt(CN)4

“…This could be evidence for a breakdown of the Debye approximation or a Schottky contribution from a metallic-strand length distribution. A further contribution to the specific heat would result from low-energy optical phonons caused by the weak coupling between the CI" ion, K + ion, water molecules, and the Pt(CN) 4 2 " complex. Such a contribution has been observed, in low-temperature specific-heat measurements in other quasi one-and two-dimensional systems such as Cdl 2 14 and Rb^WOg.…”