10 Gas phase organic ion–molecule reaction chemistry

2000 ◽  
Vol 96 ◽  
pp. 445-475 ◽  
Author(s):  
Wan Yong Feng ◽  
Scott Gronert
Keyword(s):  
Gas Phase ◽  
Molecule Reaction

ChemInform Abstract: Gas-Phase Organic Ion Molecule Reaction Chemistry

ChemInform ◽  
2010 ◽  
Vol 31 (17) ◽  
pp. no-no
Author(s):  
Wan Yong Feng ◽  
Scott Gronert
Keyword(s):  
Gas Phase ◽  
Molecule Reaction

Ion-Molecule reaction in the gas phase part VI RegioselectiveSN2 reaction from terpenoid diastereoisomeric diols using CI/NH4+

1986 ◽  
Vol 69 (4) ◽  
pp. 806-815 ◽  
Author(s):  
Jean-Claude Tabet ◽  
Chantal Prevost ◽  
Anne Bouillot ◽  
Josette Bastard ◽  
Due Do Khae Manh ◽  
...  
Keyword(s):  
Gas Phase ◽  
Molecule Reaction

The gas-phase photolysis of 2-methyl-1,3-butadiene at 123.6 nm

1984 ◽  
Vol 62 (9) ◽  
pp. 1731-1735
Author(s):  
Valerie I. Lang ◽  
Richard D. Doepker
Keyword(s):  
Nitric Oxide ◽  
Hydrogen Sulfide ◽  
Gas Phase ◽  
Quantum Efficiency ◽  
Hydrogen Iodide ◽  
Quantum Yields ◽  
Primary Decomposition ◽  
Radical Scavengers ◽  
Molecule Reaction ◽  
Reaction Channels

The gas-phase photolysis of 2-methyl-1,3-butadiene has been investigated using krypton (123.6 nm) resonance radiation. The observed neutral products of the primary decomposition were vinylacetylene, ethylene, acetylene, methylacetylene, propylene, allene, 2-methy-1-buten-3-yne, pentatriene/1-penten-3-yne, 1,3-butadiene, 2-butyne and butatriene, listed in decreasing order of concentration. There was also evidence of the presence of several radical fragments: CH2/CH3, C2H3, C3H3, and C4H5. Quantum yields for each of the products were determined in the photolysis of 2-methyl-1,3-butadiene, performed both in the presence and the absence of additives. Nitric oxide and oxygen were employed as radical scavengers, while hydrogen sulfide and hydrogen iodide were used as radical interceptors. Twelve primary, neutral molecule, reaction channels were proposed and the quantum efficiency assigned for each. The ionization efficiency of 2-methyl-1,3-butadiene was established as n = 0.55 at 10.03 eV. No products formed exclusively via an ion–molecule pathway were identified and therefore the fate of the C5H8+ ion was not determined.

Gas phase ion–molecule reactions of dimethylsulphoxide

1978 ◽  
Vol 56 (17) ◽  
pp. 2324-2330 ◽  
Author(s):  
John Edward Fulford ◽  
Joseph Wayne Dupuis ◽  
Raymond Evans March
Keyword(s):  
Gas Phase ◽  
Ambient Pressure ◽  
Reaction Chamber ◽  
Ion Trapping ◽  
Ion Chemistry ◽  
Gas Phase Ion Chemistry ◽  
Molecule Reaction ◽  
Ion Molecule Reactions ◽  
Ion Storage ◽  
Gas Phase Ion

The gas phase ion-chemistry of dimethylsulphoxide (DMSO) and deuterated dimethylsulphoxide (DMSO-d6) has been examined using a quadrupole ion store (QUISTOR) as an ion–molecule reaction chamber. The QUISTOR results are compared with those obtained by ion trapping and high pressure mass spectrometry as reported by other workers. The performance of the QUISTOR demonstrates the versatility of the technique for ion–molecule reaction studies with variation of ambient pressure and duration of ion storage.

scholarly journals The formation of urea in space

2018 ◽  
Vol 610 ◽  
pp. A26 ◽  
Author(s):  
Flavio Siro Brigiano ◽  
Yannick Jeanvoine ◽  
Antonio Largo ◽  
Riccardo Spezia
Keyword(s):  
Activation Energy ◽  
Interstellar Medium ◽  
Gas Phase ◽  
Organic Molecules ◽  
Peptide Bond ◽  
Biological Molecules ◽  
Gas Phase Reactions ◽  
Molecule Reaction ◽  
Quantum Chemistry Calculations ◽  
Highly Correlated

Context. Many organic molecules have been observed in the interstellar medium thanks to advances in radioastronomy, and very recently the presence of urea was also suggested. While those molecules were observed, it is not clear what the mechanisms responsible to their formation are. In fact, if gas-phase reactions are responsible, they should occur through barrierless mechanisms (or with very low barriers). In the past, mechanisms for the formation of different organic molecules were studied, providing only in a few cases energetic conditions favorable to a synthesis at very low temperature. A particularly intriguing class of such molecules are those containing one N–C–O peptide bond, which could be a building block for the formation of biological molecules. Urea is a particular case because two nitrogen atoms are linked to the C–O moiety. Thus, motivated also by the recent tentative observation of urea, we have considered the synthetic pathways responsible to its formation. Aims. We have studied the possibility of forming urea in the gas phase via different kinds of bi-molecular reactions: ion-molecule, neutral, and radical. In particular we have focused on the activation energy of these reactions in order to find possible reactants that could be responsible for to barrierless (or very low energy) pathways. Methods. We have used very accurate, highly correlated quantum chemistry calculations to locate and characterize the reaction pathways in terms of minima and transition states connecting reactants to products. Results. Most of the reactions considered have an activation energy that is too high; but the ion-molecule reaction between NH2OHNH2OH2+ and formamide is not too high. These reactants could be responsible not only for the formation of urea but also of isocyanic acid, which is an organic molecule also observed in the interstellar medium.

scholarly journals A Mechanistic Study of a Gas-Phase Ion/Molecule Reaction between CH2NH2+and CH4

1989 ◽  
Vol 62 (7) ◽  
pp. 2129-2137 ◽  
Author(s):  
Satoshi Okada ◽  
Yasuo Abe ◽  
Setsuo Taniguchi ◽  
Shinichi Yamabe ◽  
Tsutomu Minato
Keyword(s):  
Gas Phase ◽  
Mechanistic Study ◽  
Molecule Reaction ◽  
Gas Phase Ion

ChemInform Abstract: Gas Phase Organic Ion Molecule Reaction Chemistry

ChemInform ◽  
2001 ◽  
Vol 32 (19) ◽  
pp. no-no
Author(s):  
Wan Yong Feng ◽  
Scott Gronert
Keyword(s):  
Gas Phase ◽  
Molecule Reaction
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