Method of preparation of a radical cation salt and its use in a magnetometer has resonance (epr paramagnetic electronique)

摘要

The invention concerns the preparation of a radical cation salt of formula: & br / (see appended drawing in bopi) & br / in which ar is an aromatic hydrocarbon, possibly substituted, and x * * - is an anion is chosen from among asf6 * * -, sbf6 * * -, clo4 * * -, pf6 * * -, bf4 * * - (bc6 h5) and (4) by electrochemical reaction of a solution of ar in an organic solvent with a quaternary ammonium salt the anion x**-. The organic solvent is an alkyl formate, such as the methyl or ethyl formate. / p & & p & the radical cation salt can be used in an electron paramagnetic resonance magnetometer (epr), which comprises a tube 21 containing the salt 27 and a material capable of absorbing the water formed, for example, by molecular sieve particles 23 mixed with alumina powder, 25.