Accession Number:

ADA091534

Title:

Bromine as a Partial Oxidant. Oxidation State and Charge Transport in Brominated Nickel and Palladium Bisdiphenylglyoximates. A Comparison with the Ionidated Materials and Resonance Raman Structure-Spectra Correlations for Polybromides.

Descriptive Note:

Technical rept.,

Corporate Author:

NORTHWESTERN UNIV EVANSTON IL DEPT OF CHEMISTRY

Report Date:

1980-10-06

Pagination or Media Count:

46.0

Abstract:

This paper presents an investigation of oxidation state and charge transport in the low-dimensional materials Nidpg2Br1.0 and Pddpg2Br1.1, dpg diphenylglyoximato. Resonance Raman structure-spectra correlations are discussed for polybromides, and Br5 is assigned as the predominant halogen species in both of these materials. Thus, the Mdpg2 units are formally in fractional oxidation states of ca. 0.202 MNi and 0.222 MPd. In the optical spectra of both materials, a broad transition at 500 nm is related to the polybromide chains. Four-probe single crystal electrical conductivities dc in the stacking direction at 300 K are as high as .00091omega cm Nidpg2Br1.0 and .00015omega cm Pddpg2Br1.1. The conductivity is demonstrated to be thermally activated with activation energies of 0.33 and 0.21 eV, respectively. The transport properties of the brominated materials are found to be very similar to those of the related Mdpg2I materials MNi, Pd, a result contrary to expectations if the halogen chains were the major charge carrier. Author

Subject Categories:

  • Inorganic Chemistry
  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE