Antimony pentachloride conductivity

Antimony pentachloride is known to have a small tendency towards ionization and this is reflected in the conductivities, which are lower than those of the corresponding BC13-systems. Donor molecules of donicities below 15 give nonconducting solutions even at high donor contents. 

On treatment in carbon tetrachloride with antimony pentachloride, tri-0-acetyl-/3-D-xylopyranosyl chloride (69), tetra-0-acetyl-/3-D-xylo-pyranose (70), and tri-O-acetyl-a-D-xylopyranosyl chloride (71) give an acetoxonium salt that precipitates directly from the solution. This salt consists of a mixture of the D-xylo, B-lyxo, and D-arabino derivatives (72, 73, and 74, respectively). None of these three compounds crystallize out preferentially. Evidently, the D-xylo derivative 72 is formed initially, and is then transformed by reversible acyloxonium rearrangements into 73 and 74. Salts are not isolated when the reaction is conducted in dichloromethane, because of their high solubility in this solvent. 

Poly-/>-phenylene (PPP), after doping with a mixture of antimony pentachloride and chlorosulfonic acid, had a greatly increased electrical conductivity due to the formation of a charge-transfer complex. The term doping refers to the addition of an impurity to a material to enhance its physical properties. 

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