each of Y is independently chosen from the group of —OR, —NR, —NR2, —CR, —C—NR2, —C—OR, —CR, —{TAIL ~ C}—NR2, —C—{HEAD ~ OR}, and R, wherein each R is independently H, or a substituted or unsubstituted, branched, cyclic or straight alkyl, alkenyl or alkynyl group which possibly contains an aromatic, ester or ether moiety or one or more other heteroatoms and may have from 1 to 40 carbon atoms 