Aminoacetonitrile characterization in astrophysical-like conditions

Borget, Fabien; Danger, Grégoire; Duvernay, Fabrice; Chomat, Marion; Vinogradoff, Vassilissa; Theulé, Patrice; Chiavassa, Thierry

doi:10.1051/0004-6361/201218949

Cited by 11 publications

(12 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The large uncertainty on this value most likely derives from the assumptions made in the calculations: that the absorption strengths of the CN − and HCN CN stretching mode absorptions, and the HCN bending mode absorption do not change with environment. As has been previously demonstrated by Borget et al (2012), the CN stretch in nitriles is very sensitive to environment, with the absorption strength of CN in aminoacetonitrile changing by a factor of two between the pure molecule and a mixture of aminoacetonitrile and H 2 O (1:3). Thus we conclude that, while we can accurately determine the absorption strength of CN − at low to intermediate temperatures in a pure salt, it is not possible from these data to reliably deconvolve HCN and CN − contributions to the CN stretching mode absorption at 2100 cm −1 .…”

Section: Determination Of the Cn − Ion Band Strengthmentioning

confidence: 57%

The thermal reactivity of HCN and NH3 in interstellar ice analogues

Noble¹,

Theulé²,

Borget³

et al. 2012

Monthly Notices of the Royal Astronomical Society

Self Cite

View full text Add to dashboard Cite

HCN is a molecule central to interstellar chemistry, since it is the simplest molecule containing a carbon-nitrogen bond and its solid state chemistry is rich. The aim of this work was to study the NH 3 + HCN → NH + 4 CN − thermal reaction in interstellar ice analogues. Laboratory experiments based on Fourier transform infrared spectroscopy and mass spectrometry were performed to characterise the NH + 4 CN − reaction product and its formation kinetics. This reaction is purely thermal and can occur at low temperatures in interstellar ices without requiring non-thermal processing by photons, electrons or cosmic rays. The reaction rate constant has a temperature dependence of k(T ) = 0.016 +0.010 −0.006 s −1 exp( −2.7±0.4 kJ mol −1 RT ) when NH 3 is much more abundant than HCN. When both reactants are diluted in water ice, the reaction is slowed down. We have estimated the CN − ion band strength to be A CN − = 1.8±1.5×10 −17 cm molec −1 at both 20 K and 140 K. NH + 4 CN − exhibits zeroth-order multilayer desorption kinetics with a rate of k des (T ) = 10 28 molecules cm −2 s −1 exp( −38.0±1.4 kJ mol −1 RT ). The NH 3 + HCN → NH + 4 CN − thermal reaction is of primary importance because (i) it decreases the amount of HCN available to be hydrogenated into CH 2 NH, (ii) the NH + 4 and CN − ions react with species such as H 2 CO, or CH 2 NH to form complex molecules, and (iii) NH + 4 CN − is a reservoir of NH 3 and HCN, which can be made available to a high temperature chemistry.

show abstract

Section: Determination Of the Cn − Ion Band Strengthmentioning

confidence: 57%

The thermal reactivity of HCN and NH3 in interstellar ice analogues

Noble¹,

Theulé²,

Borget³

et al. 2012

Monthly Notices of the Royal Astronomical Society

Self Cite

View full text Add to dashboard Cite

show abstract

“…[32] When the imine is the minor reactant with the salt, we observed the thermal formation of the aminoacetonitrile (NH 2 CH 2 CN) from 135 K. Aminoacetonitrile was detected in 2008 [33] and was characterized in ISM conditions. [34] Aminoacetonitrile is a glycine precursor through the Strecker's synthesis. We demonstrated that this step of this synthesis could be carried out in ISM conditions.…”

Section: Imines Reactivity In Interstellar Medium Icesmentioning

confidence: 99%

What are the intermediates that could react in the interstellar ices?

Borget

Duvernay

Danger

et al. 2014

J of Physical Organic Chem

View full text Add to dashboard Cite

show abstract

“…Aminoacetonitrile (AAN) is a small organic compound that contains an amino group (NH 2 ) at one end and nitrile group (CN) at the other. The discovery of AAN in the constellation Sagittarius B2 (Sgr B2), in 2008, is a significant event in astrochemistry, as it plays the central role in the Strecker amino acid synthesis mechanism . Amino acids are the building blocks of proteins and, therefore, the key ingredients for the origin of life.…”

Section: Introductionmentioning

confidence: 99%

“…Once the detection of glycine is confirmed in ISM, it may throw new light on the debate regarding the origin of life in early earth. Another important molecule, in the present context, is Hydrogen Cyanide (HCN) as it plays a major role in the synthesis of AAN . In fact, AAN can be formed from methanimine (CH 2 NH) and hydrogen cyanide (HCN) in astrophysical icy conditions .…”

Section: Introductionmentioning

confidence: 99%

Effect of hydrogen‐bonded interactions on the energetics and spectral properties of the astromolecule aminoacetonitrile

Chakraborty

Lima

Silva

et al. 2017

Int J of Quantum Chemistry

View full text Add to dashboard Cite

A detailed and systematic electronic structure calculation has been performed to analyze the hydrogen-bonded interaction of aminoacetonitrile (H 2 NCH 2 CN) with hydrogen cyanide (HCN) andGlycine (H 2 NCH 2 COOH). Both HCN and aminoacetonitrile have already been detected in the interstellar medium (ISM) and their active role in the molecular mechanisms of glycine production has already been recognized. Four different density functional models have been used to study the effect of hydrogen bond formation on the energetic stability and vibrational spectra of the aminoacetonitrile-HCN and aminoacetonitrile-glycine complexes in gas phase. The aminoacetonitrile-glycine dimer is energetically far more stable than all forms of aminoacetonitrile-HCN dimers. Elastic and inelastic scattering of light off the hydrogen-bonded clusters have been investigated in details via Rayleigh and Raman spectroscopic parameters. The dipole moments and depolarization ratios are found to be sensitive on the type of hydrogen-bond network. The mean polarizabilty show appreciable dependence on the choice of the DFT-model. In general, all the chemical groups (OH, CN, NH 2 , and CH) that participate directly in the hydrogen bond formation suffer appreciable variation in the intensity of vibration. K E Y W O R D S hydrogen-bonded astromolecule, polarizability, Raman spectra, Rayleigh scattering, vibrational frequency shift 1 | I N TR ODU C TI ON Aminoacetonitrile (AAN) is a small organic compound that contains an amino group (NH 2 ) at one end and nitrile group (CN) at the other. The discovery of AAN in the constellation Sagittarius B2 (Sgr B2), in 2008, [1] is a significant event in astrochemistry, as it plays the central role in the Strecker amino acid synthesis mechanism. [2][3][4][5] Amino acids are the building blocks of proteins and, therefore, the key ingredients for the origin of life. The existence of amino acids in interstellar medium (ISM) has been a topic of interest for many years. As it is well known, the possible origin of life and its existence in interstellar space is an important aspect of exobiology and planetary chemistry. Among the 20 a-amino acids commonly found in proteins, glycine (GLY), with chemical formula NH 2 CH 2 COOH, is the simplest one. Although several attempts to detect the glycine have been carried out over the past few years, identification of isolated glycine is not firmly established yet. [6][7][8][9][10][11] In 2003, the interstellar glycine was reportedly identified in the hot molecular cores Sgr B2 (N-LMH), Orion KL, and W51 e1/e2. [10] But, the procedure of the assignment of the spectral lines used in this report suffered criticism. [11] However, the detection of GLY in the comet 81P/Wild 2 by NASA's Stardust mission in 2009 [12] brought new enthusiasm to the search of extraterrestrial amino acids. In 2016, Stardust results have been confirmed by the identification of volatile glycine along with methylamine and ethylamine in the shroud of gases surrounding the Comet 67P/Churyumov-Gerasimenko by the use ...

show abstract

Aminoacetonitrile characterization in astrophysical-like conditions

Cited by 11 publications

References 46 publications

The thermal reactivity of HCN and NH3 in interstellar ice analogues

The thermal reactivity of HCN and NH3 in interstellar ice analogues

What are the intermediates that could react in the interstellar ices?

Effect of hydrogen‐bonded interactions on the energetics and spectral properties of the astromolecule aminoacetonitrile

Contact Info

Product

Resources

About