aminoalkyl, carboxyalkyl, carboxyamidealkyl or a couple to a site-directing molecule; where, at least one of R1 -R10 is an oligonucleotide or a couple to an oligonucleotide; R11 is alkyl, alkenyl, oxyalkyl or hydroxyalkyl having up to about 3 carbon atoms and having rotational flexibility around a first-bound carbon atom; where R6 and R9 are other than hydrogen, then R5 and R10 are hydrogen or met