ELECTRONIC-PROPERTIES OF ONE-DIMENSIONAL IODINE COMPLEX - BENZO[B]PHENOTHIAZINE-I2.5

One-dimensional metallic conductance was observed along the c axis of a single crystal of benzo[b]phenothiazine-iodine complex, (B[b]PT)2(I3-)(I)2, the crystal structure of which was preliminarily determined by X-ray analysis. It metal-insulator transition was observed around 235 K, and the sign of the carriers seemed to be positive above 250 K. From the reflection spectra, with polarized light parallel to the c axis, a plasma-edge-like dispersion was observed in near IR region. Several parameters were evaluated by assuming a tight binding band model. The EPR spectra of this complex consist of only one broad signal (peak-to-peak width at room temperature 250x10-4T) in the temperature range from 4 K to 296 K (g = 1.998 +/- 0.002).