prov:value
| - The composition of claim 1 wherein the electron withdrawing groups are selected from halogens, CN, CF3, CnF2n+1, trifluorovinyl, NO2, CO2R, C(O)R, S(O)R, SO2R, SO3R, P(O)R, PO2R, PO3R, C???CR, aryl or heteroaryl groups substituted with halogens, CN, CF3, CnF2n+1, trifluorovinyl, NO2, CO2R, C(O)R, S(O)R, SO2R, SO3R, P(O)R, PO2R, or PO3where R is a hydrogen, alkyl, aryl or heteroaryl group. 9.
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