Star‐Shaped Molecules Containing Polyalkynyl Groups with Metal Moieties on Benzene and Triphenylene Cores

A series of star‐shaped molecules with a silyl group and an aromatic core surrounded by extended π conjugative arms has been synthesized by the use of Sonogashira coupling methods. They show excellent fluorescence intensity with high quantum yield. These molecules undergo desilylation in the presence of n Bu 4 NF to give terminal polyalkynyl compounds. By incorporating metal moieties such as palladium, platinum and gold into these compounds, star‐shaped molecules can be obtained. Photophysical properties of these molecules are investigated spectroscopically in solution. These star‐shaped molecules are characterized by IR, NMR ( 1 H, 31 P and 13 C) spectroscopy, as well as MALDI‐TOF mass spectrometry. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)