Abstract
Polycyclic aromatic hydrocarbons containing fully unsaturated five-membered rings as integral components of their trigonal carbon networks (CP-PAHs) have attracted considerable attention recently in a variety of scientific circles. Some of these novel nonalternant hydrocarbons exhibit unusual photophysical behavior, e.g., anomalous fluorescence, and/or pronounced biological activity, acute cyctotoxicity. Many have been identified or are believed to be formed as products of incomplete combustion, either in flames or in cigarette smoke, and a few have been produced by flash pyrolyses of other hydrocarbons. Five-membered rings fully encircled by benzene rings impart a curvature to the trigonal carbon network that gives rise to the bowl-shaped geometry of corannulene and to the closed polyhedral surfaces of the fullerenes. Herein, the authors report the syntheses and a preliminary spectroscopic examination of the three isomeric dicyclopentapyrenes.
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