Interaction of ethene, 2-methylpropene, and benzene with the sodium(1+) ion. 1. Quantum chemical study of gas-phase complexes

1982 ◽  
Vol 86 (8) ◽  
pp. 1327-1332 ◽  
Author(s):  
Joachim Sauer ◽  
Detlef Deininger
Keyword(s):  
Gas Phase ◽  
Quantum Chemical ◽  
Quantum Chemical Study ◽  
Chemical Study

An alternative gas-phase electron diffraction and quantum chemical study of nitroethane

2010 ◽  
Vol 978 (1-3) ◽  
pp. 41-47 ◽  
Author(s):  
Igor F. Shishkov ◽  
Victor A. Sipachev ◽  
Piotr I. Dem’yanov ◽  
Olga V. Dorofeeva ◽  
Natalja Vogt ◽  
...  
Keyword(s):  
Electron Diffraction ◽  
Gas Phase ◽  
Quantum Chemical ◽  
Quantum Chemical Study ◽  
Chemical Study ◽  
Gas Phase Electron Diffraction

Quantum chemical study on the formation of isopropyl cyanide and its linear isomer in the interstellar medium

2020 ◽  
pp. 1-11
Author(s):  
Keshav Kumar Singh ◽  
Poonam Tandon ◽  
Alka Misra ◽  
Shivani ◽  
Manisha Yadav ◽  
...  
Keyword(s):  
Amino Acids ◽  
Interstellar Medium ◽  
Gas Phase ◽  
Quantum Chemical ◽  
Density Functional ◽  
Quantum Chemical Study ◽  
Chemical Study ◽  
Dark Cloud ◽  
Water Ice ◽  
Hydrocarbon Radicals

Abstract The formation mechanism of linear and isopropyl cyanide (hereafter n-PrCN and i-PrCN, respectively) in the interstellar medium (ISM) has been proposed from the reaction between some previously detected small cyanides/cyanide radicals and hydrocarbons/hydrocarbon radicals. n-PrCN and i-PrCN are nitriles therefore, they can be precursors of amino acids via Strecker synthesis. The chemistry of i-PrCN is especially important since it is the first and only branched molecule in ISM, hence, it could be a precursor of branched amino acids such as leucine, isoleucine, etc. Therefore, both n-PrCN and i-PrCN have significant astrobiological importance. To study the formation of n-PrCN and i-PrCN in ISM, quantum chemical calculations have been performed using density functional theory at the MP2/6-311++G(2d,p)//M062X/6-311+G(2d,p) level. All the proposed reactions have been studied in the gas phase and the interstellar water ice. It is found that reactions of small cyanide with hydrocarbon radicals result in the formation of either large cyanide radicals or ethyl and vinyl cyanide, both of which are very important prebiotic interstellar species. They subsequently react with the radicals CH2 and CH3 to yield n-PrCN and i-PrCN. The proposed reactions are efficient in the hot cores of SgrB2 (N) (where both n-PrCN and i-PrCN were detected) due to either being barrierless or due to the presence of a permeable entrance barrier. However, the formation of n-PrCN and i-PrCN from the ethyl and vinyl cyanide always has an entrance barrier impermeable in the dark cloud; therefore, our proposed pathways are inefficient in the deep regions of molecular clouds. It is also observed that ethyl and vinyl cyanide serve as direct precursors to n-PrCN and i-PrCN and their abundance in ISM is directly related to the abundance of both isomers of propyl cyanide in ISM. In all the cases, reactions in the ice have smaller barriers compared to their gas-phase counterparts.

α- and 310-Helix Interconversion:  A Quantum-Chemical Study on Polyalanine Systems in the Gas Phase and in Aqueous Solvent

2001 ◽  
Vol 123 (25) ◽  
pp. 6054-6060 ◽  
Author(s):  
Igor A. Topol ◽  
Stanley K. Burt ◽  
Eugen Deretey ◽  
Ting-Hua Tang ◽  
Andras Perczel ◽  
...  
Keyword(s):  
Gas Phase ◽  
Quantum Chemical ◽  
Quantum Chemical Study ◽  
Chemical Study ◽  
Aqueous Solvent ◽  
310 Helix

scholarly journals A quantum chemical study on gas phase decomposition pathways of triethylgallane (TEG, Ga(C2H5)3) and tert-butylphosphine (TBP, PH2(t-C4H9)) under MOVPE conditions

2014 ◽  
Vol 16 (32) ◽  
pp. 17018-17029 ◽  
Author(s):  
Andreas Stegmüller ◽  
Phil Rosenow ◽  
Ralf Tonner
Keyword(s):  
Gas Phase ◽  
Quantum Chemical ◽  
Quantum Chemical Study ◽  
Chemical Study ◽  
Phase Decomposition ◽  
Chemical Methods ◽  
Decomposition Products ◽  
Elementary Reactions ◽  
Quantum Chemical Methods ◽  
Precursor Molecules

Gas phase decomposition products of MOVPE precursor molecules TEG and TBP were identified via thermodynamic and kinetic data from a catalogue of 61 elementary reactions as calculated by quantum chemical methods.

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