Synthesis of "donor¯bridge¯acceptor" triad compounds containing the aromatic sulfur bridges

Novel donor¯bridge¯acceptor triad compounds, in which diphenyl disulfide, thioxanthone and thianthrene are used as a bridge, have been synthesized. With the introduction of amino groups in aromatic sulfur compounds, triads containing 1,8-naphthalic anhydride were synthesized via the condensation of the amino groups with the anhydride. A carbazole moiety was introduced by a solid-phase Ullmann reaction, using copper powder as the catalyst. Spectroscopic properties of the synthesized compounds are reported.