The synthesis of a new series of photoluminescent compounds, namely 5,8-diaryl quinoxaline derivatives (aryl = phenyl, 4-fluorophenyl, 4-methoxyphenyl, and 4-cyanophenyl), was achieved by a direct Suzuki cross-coupling reaction with the employment of a NCP-pincer palladacycle. The electrochemical and photophysical properties of these compounds were also investigated. Four new 4,8-diaryl-2,1,3-benzothiadiazoles were also synthesized in order to enable a comparison between the two types of nitrogen-containing π-extended heterocycles. The substitution of a hydrogen atom at the 4-position of the aryl that is groups attached to the quinoxaline or benzothiadiazole base by either elec-

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Thiadiazole derivatives R 0300Photophysical and Electrochemical Properties of π-Extended Molecular 2,1,3-Benzothiadiazoles. -Suzuki and Sonogashira cross coupling reactions are used to prepare 4,7-disubstituted 2,1,3-benzothiadiazoles with extended π-system (III) and (VI). These compounds show interesting photo-luminescent and photo-electronic properties which make them promising candidates for testing as organic LED's. -(DASILVEIRA NETO, B. A.; LOPES, A. S.; EBELING, G.; GONCALVES, R. S.; COSTA, V. E. U.; QUINA, F. H.; DUPONT*, J.; Tetrahedron 61 (2005) 46, 10975-10982; Lab. Mol. Catal., Inst. Quim.,