prov:value
| - Compounds of the said general formula (I) in which no more than three of the radicals R1 to R4 are a phenyl group and at least one of the radicals R1 to R4 a group from the series comprising C8 F17 -CH2 -CH2 - and Rf-CH2 -CH2 -(Rf=C6 F13 to C12 F25), and X- is BF4 -, Hal-, such as, for example, F-, Cl-, Br-, I-, or is PF6 -, B(aryl)4 -, such as, for example, tetraphenyl borate or p-chlorotetraphen
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