Patent ID: 8258347

Claim:
A compound having the formula: wherein each Ar is a phenyl group; E represents C(R 4 ) 2 ; and each R 4 is independently selected from the group consisting of hydrogen, halogen, hydroxy, alkoxy, nitrate, nitrite, sulfate, a C1-C10 organic group, and a linking group; wherein at least one Ar is a phenyl group in which one or more carbon atoms of the phenyl group are substituted with a substituent selected from the group consisting of alkyl, aryl, heteroaryl, halogen, nitro, cyano, hydroxyl, alkoxyl, aryloxyl; thio, mercapto, alkylthio, arylthio, amino, alkylamino, arylamino, dialkylamino, diarylamino, arylalkylamino, aminocarbonyl, alkylaminocarbonyl, arylaminocarbonyl, dialkylaminocarbonyl, diarylaminocarbonyl, arylalkylaminocarbonyl, carboxyl, alkyloxycarbonyl, aryloxycarbonyl, aldehyde, arylcarbonyl, alkylcarbonyl, iminyl, aryliminyl, alkyliminyl, sulfo, alkylsulfonyl, arylsulfonyl, hydroximinyl, aryloximinyl, and alkoximinyl; and wherein two or more alkyl or heteroalkyl substituents of a phenyl group may optionally be combined to form fused aryl-alkyl or aryl-heteroalkyl ring systems.