wherein R1 is an anchoring group, said anchoring group including at least one atom selected from the group consisting of: a nitrogen atom, an oxygen atom, a silicon atom and a sulfur atom; R2 is a conjugated group; R4 is a charge transfer group; M is independently selected from the group consisting of: O, NH, NR and S where R is a small alkyl group; n is an integer from 1 to 3; j is an integer fro