Monovalent organic amines; R+, have been used to synthesize 15 intensely colored salts of composition RxSbyBrz. It is believed that the dark color may be due to the presence of mixed oxidation states of antimony or to some other type of charge transfer phenomena. Preliminary X-ray investigations and density measurements demonstrate that the ratio R:Sb:Br is cation dependent. Such ratios as 3:2:12, 4:2:12, and 2:1:9 have been observed and imply that the presumed Sb(III) and Sb(V) atoms do not necessarily occupy pseudo-equivalent positions in the unit cell. The temperature dependence of the color of these salts has also been studied. Many of these salts exhibit a color change from black or dark red at room temperature to orange at liquid nitrogen temperatures. The diffuse reflectance spectra of antimony bromide complexes diluted in KCI are reported for some of the cations. Resistivity measurements indicate that the salts, in general, are semiconductors having resistances in the range 109-106 ohm-cm.
Proceedings of the Iowa Academy of Science
©1968 Iowa Academy of Science, Inc.
Hackert, M. L.; Lawton, S. L.; and Jacobson, R. A.
"Properties of lntervalence Antimony Bromides,"
Proceedings of the Iowa Academy of Science, 75(1), 97-108.
Available at: https://scholarworks.uni.edu/pias/vol75/iss1/17