Collect. Czech. Chem. Commun. 1995, 60, 851-855

ESR Spin Trapping Study of Sodium and Tetramethylammonium Mercaptoundecahydro-closo-dodecaborates(2-) and Sodium Tetraborate Aqueous Solutions Irradiated by UV Light at Room Temperature

Oldřich Štrouf and Pavel Stopka

Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic, 160 00 Prague 6, Czech Republic


The superoxide anion radicals O2-• were identified and determined in aqueous solutions of sodium and tetramethylammonium salts of mercaptoundecahydro-closo-dodecaborate(2-) (mercaptoborate), and sodium tetraborate, irradiated by high pressure mercury discharge lamp at room temperature by the of ESR spin trapping method. The quantity of the generated O2-. depends on the initial oxygen concentration in the irradiated solutions. The radical generation can play a crucial role in the application of mercaptoborate in boron neutron capture therapy (BNCT) of brain tumours.