Extended conjugation in di- and tri- arylmethane dyes. Part 3. The effects of increased planarity in Victoria Blue dyes

The synthesis of novel derivatives of the Victoria Blue series of dyes containing the 3,6-bis(dimethylamino)fluoren-9-yl moiety is reported. The consequent increased planarity of the system results in a large bathochromic shift of the x-band compared to the parent compound.