Unstable intermediates. Part LXXXVII. The dipositive radical cations of gallium, thallium, and mercury derived from aqueous solutions of gallium(III), thallium(III), and mercury(II) salts at 77 K by γ-irradiation

Abstract

Highfield hyperfine features associated with ⁶⁹Ga, ⁷¹Ga, ²⁰⁵Tl, ¹⁹⁹Hg, and ²⁰¹Hg which appear in the e.s.r. spectra of frozen aqueous solutions of salts of these metals after exposure to ⁶⁰Co γ-rays show conclusively that the ions Ga²⁺, Tl²⁺, and Hg⁺ are formed. Hyperfine coupling constants and g-values are reported, together with results from annealing experiments. Both thallium-(I) and -(III) salts gave Tl²⁺ ions, with indistinguishable magnetic parameters despite the difference in starting material.