Nanosized molecular propellers by cyclodehydrogenation of polyphenylene dendrimers.

Christopher D Simpson, Gunter Mattersteig, Kai Martin, Lileta Gherghel, Roland E Bauer, Hans Joachim Räder, Klaus Müllen

Index: J. Am. Chem. Soc. 126 , 3139, (2004)

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Abstract

In a polymer analogous approach, large dendritic oligophenylenes containing benzene and tetraphenylmethane cores are transformed via oxidative cyclodehydrogenation to novel propeller-shaped molecules with large polycyclic aromatic hydrocarbon units as "blades". Structure analysis is performed by a combination of MALDI-TOF mass spectrometry, UV/vis, fluorescence, and Raman spectroscopy using solid-state sample preparation methods. These methods are also utilized to determine the degree of the cyclodehydrogenation reaction.