Document Detail


Low temperature formation of naphthalene and its role in the synthesis of PAHs (polycyclic aromatic hydrocarbons) in the interstellar medium.
MedLine Citation:
PMID:  22198769     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Polycyclic aromatic hydrocarbons (PAHs) are regarded as key molecules in the astrochemical evolution of the interstellar medium, but the formation mechanism of even their simplest prototype-naphthalene (C(10)H(8))-has remained an open question. Here, we show in a combined crossed beam and theoretical study that naphthalene can be formed in the gas phase via a barrierless and exoergic reaction between the phenyl radical (C(6)H(5)) and vinylacetylene (CH(2) = CH-C ≡ CH) involving a van-der-Waals complex and submerged barrier in the entrance channel. Our finding challenges conventional wisdom that PAH-formation only occurs at high temperatures such as in combustion systems and implies that low temperature chemistry can initiate the synthesis of the very first PAH in the interstellar medium. In cold molecular clouds, barrierless phenyl-type radical reactions could propagate the vinylacetylene-mediated formation of PAHs leading to more complex structures like phenanthrene and anthracene at temperatures down to 10 K.
Authors:
Dorian S N Parker; Fangtong Zhang; Y Seol Kim; Ralf I Kaiser; Alexander Landera; Vadim V Kislov; Alexander M Mebel; A G G M Tielens
Related Documents :
22055709 - The tensile properties of frozen and thawed lean beef.
22163699 - Determination of ammonium ion using a reagentless amperometric biosensor based on immob...
21907209 - Pathogen-associated molecular pattern-induced mitochondrial membrane depolarization in ...
25394879 - Organic/inorganic composite membranes based on poly(l-lactic-co-glycolic acid) and meso...
21994169 - The quantitative response of wheat vernalization to environmental variables indicates t...
22255409 - Design of a high sensitive double-gate field-effect transistor biosensor for dna detect...
24056299 - Microfluidic passive permeability assay using nanoliter droplet interface lipid bilayers.
23801779 - Biochemical evidence for energy-independent flippase activity in bovine epididymal sper...
18179789 - Temperature dependent vibrational modes of glycosidic bond in disaccharide sugars.
Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2011-12-22
Journal Detail:
Title:  Proceedings of the National Academy of Sciences of the United States of America     Volume:  109     ISSN:  1091-6490     ISO Abbreviation:  Proc. Natl. Acad. Sci. U.S.A.     Publication Date:  2012 Jan 
Date Detail:
Created Date:  2012-01-05     Completed Date:  2012-03-06     Revised Date:  2013-06-26    
Medline Journal Info:
Nlm Unique ID:  7505876     Medline TA:  Proc Natl Acad Sci U S A     Country:  United States    
Other Details:
Languages:  eng     Pagination:  53-8     Citation Subset:  IM    
Affiliation:
Department of Chemistry, University of Hawaii, Honolulu, HI 96822, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Cold Temperature*
Cosmic Dust*
Free Radicals
Isomerism
Mass Spectrometry
Molecular Weight
Naphthalenes / chemical synthesis*,  chemistry
Polycyclic Hydrocarbons, Aromatic / chemical synthesis*,  chemistry
Surface Properties
Thermodynamics
Chemical
Reg. No./Substance:
0/Cosmic Dust; 0/Free Radicals; 0/Naphthalenes; 0/Polycyclic Hydrocarbons, Aromatic; 2166IN72UN/naphthalene
Comments/Corrections

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Database independent proteomics analysis of the ostrich and human proteome.
Next Document:  Incorporating microorganisms into polymer layers provides bioinspired functional living materials.