| abstract |
A compound having the following structure: ** Formula ** where each R is independently hydrogen, a C1 to C20 alkyl group, a C3 to C20 carbocyclic group, a C1 to C20 heterocyclic group, a carboxylic acid group, an ester group, an amide group, hydroxyl or an ether group; where, optionally, adjacent R groups form a C3 to C20 carbocyclic ring or heterocyclic ring; where each ** Formula ** is independently a C5 to C20 carbocyclic ring system or a C2 to C20 heterocyclic ring system, where the ring system comprises one or more rings; wherein at least one of the ring systems has at least one solubilizing group selected from a sulfonic acid group, a sulfonate salt group, a phosphonic acid group, a phosphonate salt group and a polyethylene glycol group; where, optionally, the ring system has an orientation group; and where n is 1 to 5. |