| 摘要 |
Compounds of the following formula are disclosed: wherein R<B >is a substituted or unsubstituted aryl or heteroaryl moiety; at least one of R<U >and R<L >is a phosphorus-containing moiety, J, and the other of R<U >and R<L >is independently chosen from H; halogen; -CN; -NO2; -J; -SO2R; -SO2NRR'; or -ZR<J>, wherein each occurrence of Z is independently -O-, -S- or -NR- and each occurrence of R<J >is independently -R, COR, -COOR or -CONRR'.
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