| http://www.w3.org/ns/prov#value | - R.sup.1 to R.sup.7 are particularly preferably methyl, ethyl, propyl, i-propyl or butyl.The substituents R.sup.1 to R.sup.4 in the formulae [NR.sup.1R.sup.2R.sup.3R.sup.4].sup.+ or [PR.sup.1R.sup.2R.sup.3R.sup.4].sup.+ are particularly preferably identical.As a consequence of the synthesis, preference is given to a group of salts in which one substituent R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5
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