Abstract
The resistivity of four one-dimensional halogen-bridged metal complexes, Pt 2(CH 3CS 2) 4I and M(chxn) 2X 3 (M = Ni, Pd, Pt; X = Br; I; chxn = 1R, 2R-cyclohexanediamine), has been studied up to 7 GPa under quasi-hydrostatic conditions. The resistivity of Pt 2(CH 3CS 2) 4I and Ni(chxn) 2Br 3 with regular chains monotonically decreased with increasing pressure. On the other hand, the resistivity of Pd(chxn) 2Br 3 and Pt(chxn) 2I 3 with alternating lienar chains rapidly decreased in the low pressure region. The activation energy of the four metal complexes was in the range 0.03–0.05 eV at 7 GPa. Metallic behavior was not observed even at high pressures. The electrical conduction of the complexes is discussed.
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