Formation of Bi(II) and Bi(IV) in aqueous hydrochloric solutions of Bi(III)

They have detected the formation of Bi(II) and Bi(IV) in concentrated hydrochloric acid solutions and determined certain of their physicochemical properties using low-temperature radiolysis with optical recording, EPR spectroscopy, and pulse radiolysis. The formation of bismuth (II) and bismuth (IV) under the action of ionizing radiation on hydrochloric acid solutions of bismuth (III) has been shown by low-temperature and pulse radiolysis. The kinetics of bismuth (IV) disappearance at 3000K have a complex nature and would seem to be caused both by the disproportionation of bismuth (IV) and the reaction of bismuth (IV) with bismuth (II), which leads to bismuth (III). The properties of bismuth (IV), which is formed from the reaction of Cl2- with bismuth (III) agree with previously established relationships on the variation in optical transition energies and the unpaired electron density at the s atomic orbital of the ion for the series of isoelectronic ions mercury (I), thallium (II), lead (III), and bismuth (IV) in the 2S/sub 1/2/ state