Cover Picture

The cover picture shows emission colors of crystals of a series of 2,5-diarylsiloles (the structure of one is shown in the lower right-hand corner) under the irradiation of light at 365 nm. Their properties, such as fluorescence, and their electronic structures can be tuned over a wide range by the appropriate choice of the aryl groups at the 2- and 5-positions. Advantageously, this structural modification can be readily achieved by the one-pot synthesis of the 2,5-diarylsiloles from bis(phenylethynyl)silanes, as shown in the upper left-hand corner. These siloles are promising as new materials for organic electroluminescent devices. This work is described in more detail by K. Tamao et al. on p. 1683 ff. [ Magnified Cover Picture ]