Patent ID: 7425527

Claim:
A compound having the formula: wherein a.) R 1 is a substituted or unsubstituted alkyl or aryl moiety comprising at least five carbons; b.) R 2 is a substituted or unsubstituted alkyl moiety comprising from one to four carbons; c.) R 3 is a bridging moiety selected from a substituted aromatic moiety, unsubstituted aromatic moiety or a moiety having the formula: —(CR 5 R 6 ) a —X b -Q c -X d —[(CR 7 R 8 ) e —O] f —(CR 9 R 10 ) g — wherein: i.) the indices b and c are independently 0 or 1; ii.) the index d is 0 or 1 provided that when c is 0, d is 0; iii.) the indices a and g are independently an integer from 0 to 10; iv.) the index f is an integer from 0 to 20; v.) the index e is an integer from 1 to 6; vi.) R 5 , R 6 , R 7 , R 8 , R 9 and R 10 are each independently selected from H, a substituted C 1 -C 20 alkyl, an unsubstituted C 1 -C 20 alkyl, a substituted C 4 -C 10 aryl or heteroaryl. or an unsubstituted C 4 -C 10 aryl or heteroaryl; vii.) each X is independently selected from O, S, NR 11 wherein R 11 is selected from H, a substituted C 1 -C 20 alkyl, an unsubstituted C 1 -C 20 alkyl, a substituted C 4 -C 10 aryl or heteroaryl, or an unsubstituted C 4 -C 10 aryl or heteroaryl; and viii.) Q is CO, SO 2 , SO, PO or PO 2 ; d.) R 4 is a charged moiety; e.) G is —C(O)—, f.) Z, when present, is a charge balancing counter ion; and g.) at least one of R 1 or R 2 is covalently bound directly to at least one of R 3 or R 4 .