Process for preparation of radical cation salts and their use in electron paramagnetic resonance magnetometer (EPR).

摘要

Preparation of a radical cation salt of formula:
(Ar2).<+>X<->
in which Ar is an optionally substituted aromatic hydrocarbon and X<-> is an anion chosen from AsF6<->, SbF6<->, ClO4<->, PF6<->, BF4<-> and (BC6H5)4<-> by electrochemical reaction of a solution of Ar in an organic solvent with a quaternary ammonium salt containing the anion X<->. The organic solvent is an alkyl formate such as methyl or ethyl formate.
<??>The radical cation salt can be employed in an electron paramagnetic resonance (EPR) magnetometer which comprises a tube (21) containing this salt (27) and a material capable of absorbing water, consisting, for example, of particles of molecular sieve (23) mixed with alumina powder (25).
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