Abstract

13C NMR measurements have been carried out to investigate the nature of the electronic state of the one-dimensional half-filled band system, (TTM-TTP)I 3. Metal–insulator transition at around 120 K was observed through the temperature dependence of NMR relaxation rate, 1/ T 1. From the analysis of NMR spectra in the insulating state, it is strongly suggested that charge disproportionation with the valences of the TTM-TTP molecules 2-0-2-0 exists along the stacking axis.

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