title: Formation of aromatic structures from chain hydrocarbons in electrical discharges: absorption and fluorescence study of C11H9(+) and C11H9(•) isomers in neon matrices.
abstract: A set of arenes (phenylacetylene, indene, and naphthalene cations and C(11)H(9)(+) isomers) was produced from 2,4-hexadiyne diluted in helium in a hot-cathode discharge source. The mass-selected ions were codeposited with neon at 6 K and investigated by electronic absorption spectroscopy. This reveals that fused-ring species are readily formed from an acyclic precursor in such a source. After photobleaching of matrices containing C(11)H(9)(+), neutral C(11)H(9)(•) radicals were also characterized. Assignment of the observed transitions to different m/z = 141 cationic and corresponding neutral isomers is given and supported by experiments using other precursors, fluorescence measurements, and time-dependent density functional and second-order approximate coupled cluster calculations.
authors: Department of Chemistry, University of Basel, Klingelbergstrasse 80, CH-4056 Basel, Switzerland.
authors: Adam
authors: A
authors: Nagy
authors: Jan
authors: J
authors: Fulara
authors: John P
authors: JP
authors: Maier