Process for the preparation of a radical cation salt and its use in an electron paramagnetic resonance (EPR) magnetometer
US5159269A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 13, 1990 |
| Grant date | Oct 27, 1992 |
| Priority date | — |
| Expiry date | Jun 13, 2010 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25B3/23
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The invention relates to the preparation of a radical cation salt of formula: EQU (Ar).sub.2 .multidot.+X.sup.- in which Ar is an optionally substituted aromatic hydrocarbon and X.sup.- an anion chosen from among AsF.sub.6 -, SbF.sub.6 -, ClO.sub.4 -, Pf.sub.6 -, BF.sub.4 - and ((BC.sub.6 H.sub.5).sub.4) by the electrochemical reaction of a solution of Ar in an organic solvent with a quaternary ammonium salt incorporating the anion X.sup.-. 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).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.