Optical characterization of platinum-halide ladder compounds
Abstract
New varieties of quasi-one-dimensional halogen (X)-bridged transition-metal (M) complexes, (C8H6N4)[Pt(C2H8N2)X]2X(ClO4)3·H2O (X=Br,Cl) and (C10H8N2)[Pt(C4H13N3)Br]2Br4·2H2O, comprising two-leg ladders of mixed-valent platinum ions, are described in terms of a multiband extended Peierls-Hubbard Hamiltonian. The polarized optical conductivity spectra are theoretically reproduced and the ground-state valence distributions are reasonably determined. The latter variety, whose interchain valence arrangement is out of phase, is reminiscent of conventional MX single-chain compounds, while the former variety, whose interchain valence arrangement is in phase, reveals itself as a novel d-p-π-hybridized multiband ladder material.
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