Biology
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..855...42g&link_type=abstract
ASTROCHEMISTRY: From Laboratory Studies to Astronomical Observations. AIP Conference Proceedings, Volume 855, pp. 42-52 (2006).
Biology
Chemical Reactions, Energy Disposal, And Angular Distribution, As Studied By Atomic And Molecular Beams, Reactivity Of Clusters, Astrobiology And Astrochemistry Of The Solar System And Interplanetary Space
Scientific paper
Crossed molecular beams experiments of dicarbon, C2(X1Σg+/a3Πu), and tricarbon molecules, C3(X1Σg+), with unsaturated hydrocarbons acetylene (C2H2), ethylene (C2H4), methylacetylene (CH3CCH), and allene (H2CCCH2) were carried out at 27 collision energies between 11 and 128 kJmol-1 utilizing a universal crossed beams machine. The data suggest that all reactions of C2 and C3 are indirect and involve cyclic intermediates formed by an initial addition of dicarbon or tricarbon molecule to the π bond of the hydrocarbon; these cyclic intermediates isomerize to acyclic structures. The latter were found to decompose via atomic/molecular hydrogen loss to C4H [HCCCC], i-C4H3 [H2CCCCH], C5H[HCCCCC], C5H2[H2CCCCC], n-C5H3 [HCCCCCH2], i-C5H3[HCCCHCCH], and C6H3 [H2CCCCCCH]. All dicarbon reactions are barrier-less, whereas pronounced entrance barriers between 40 and 80 kJmol-1 are present in the entrance channel of the tricarbon reactions. The identification of the dicarbon versus atomic hydrogen and tricarbon versus atomic/molecular hydrogen exchange pathways suggest the possibility of these reactions to form hydrogen-deficient, often resonantly-stabilized free hydrocarbon radicals in combustion flames and in extraterrestrial environments via reactions of small carbon clusters with unsaturated hydrocarbons.
Gu Xibin
Guo Ying
Kaiser Ralf I.
Mebel Alexander M.
Zhang Fangtong
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