Synthesis of a giant 222 carbon graphite sheet.
In this paper we present the synthesis and characterization of the so far largest polycyclic aromatic hydrocarbon (PAH), containing 222 carbon atoms or 37 separate benzene units. First a suitable three-dimensional oligophenylene precursor molecule is built up by a sequence of Diels-Alder and cyclotrimerization reactions and then planarized in the final step by oxidative cyclodehydrogenation to the corresponding hexagonal PAH. Structural proof is based on isotopically resolved MALDI-TOF mass spectra and electronic characteristics are studied by UV/Vis spectroscopy.
Simpson
Christopher D
CD
Max-Planck-Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany.
Brand
J Diedrich
JD
Berresheim
Alexander J
AJ
Przybilla
Laurence
L
Räder
Hans Joachim
HJ
Müllen
Klaus
K