Results.±The structures investigated in the present paper are depicted below. The choice of these molecules was guided by the following previous findings: i) a MeO group at C (7) leads to relatively high absorption intensities; ii) the largest bathochromic shifts are found for 6-MeO derivatives; iii) high-fluorescence quantum yields are shown by 3-aryl derivatives; iv) linear benzo annulation has a bathochromic effect comparable to MeO substitution at C (6 ...
