| http://www.w3.org/ns/prov#value | - nitrate derivatives, amides, sulfones and sulfolanes, wherein said salt is represented by one of the following formulas: ##STR5## wherein M is an alkaline or alkaline earth metal, a transition metal or a rare earth metal,RF and R'F are identical or different and each represent a perhalogen radical having from 1 to 12 carbon atoms, QF is a perfluorinated bivalent radical having from 2 to 6 carbon
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