| http://www.w3.org/ns/prov#value | - e atoms may be substitute by a halogen atom other than fluorine; wherein X and Z are the same or different and are selected from the group consisting of --(CF2)r COF, --(CF2)r OCF3, --(CF2)r COOH and --Cr F2r+1--1 Clq, wherein r is an integer from 1 to 12 and q is an integer from 0 to 25; wherein R1, R2, R3 and R4 are the same or different and are selected from the group consisting of --F, --Cl, -
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