| 摘要 |
The invention relates to the preparation of a radical cation salt of formula: (Ar)2x+X- in which Ar is an optionally substituted aromatic hydrocarbon and X-an anion chosen from among AsF6-, SbF6-, ClO4-, Pf6-, BF4- and ((BC6H5)4) by the electrochemical reaction of a solution of Ar in an organic solvent with a quaternary ammonium salt incorporating the anion X-. The organic solvent is an alkyl formate, such as methyl or ethyl formate. The radical cation salt can be used in an electron paramagnetic resonance (EPR) magnetometer, which comprises a tube (21) containing said salt (27) and a material able to absorb water and e.g. constituted by particles of a molecular sieve (23) mixed with alumina powder (25).
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