group consisting of phosphorus and nitrogen atoms separately or together, wherein X is an anionic counterion R1 and R2 are selected from the group consisting of alkyl and aralkyl groups containing 1 to 20 carbon atoms and R1 and R2 are the same or different, and wherein Link is a carbon chain group selected from the group consisting of dialkylenearyl, aryl, alkylene, alkenylene and alkynylene gro