Infrared and Raman Investigation of Condensed Phases of Methylamine and Its Deuterium Derivatives

Durig, J. R.; Bush, S. F.; Baglin, F. G.

doi:10.1063/1.1670372

Cited by 82 publications

(43 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The Raman spectra of 2 – 6 measured at 150 K and 290 K are shown in Figure . The broad overlapped peaks between 3,100 and 3,300 cm −1 are all due to hydrogen‐bonded NH stretching in the tape, as confirmed via N ‐deuteration of 2 and previous studies (Figure S3 and Table S2). Deuteration also leads to the peak at 1,621 cm −1 in 2 splitting into a peak at 1,609 cm −1 , assigned to ring deformation, and a new peak at 1,187 cm −1 for ND deformation, indicating that peaks in the range 1,604–1,627 cm −1 in all derivatives can be assigned to overlapping NH deformation, CN stretching, and in‐plane ring deformation modes.…”

Section: Resultssupporting

confidence: 85%

Quantifying alkyl chain disorder in crystalline models of lipid bilayers using Raman spectroscopy

Rich

Bhattacharyya

Aldilla

et al. 2018

J Raman Spectroscopy

View full text Add to dashboard Cite

Crystalline bis‐N‐alkyl‐chlorotriazines 2–6 can be considered multilayers of lipid bilayers comprising a rigid hydrogen‐bonded tape in the polar layer separated by a lipid region of small to medium‐length alkyl chains. The persistent ordering of these tapes acts as a scaffold in the solid state enabling measurement of temperature‐induced conformational changes in the “lipid phase” using X‐ray crystallography. The alkyl chains in these structures are loosely packed but generally ordered at low temperature, undergoing a slow transition to a disordered structure clearly observed in the Raman spectrum. The longer‐chain derivatives 4–6 show a distinct Raman spectrum for the ordered and disordered crystallographic phases enabling a least squares fitting at each temperature point. Calibration of the Raman fit values for 5 and 6 using powder X‐ray diffraction allows a quantification of each phase and highlights the unique response of each derivative with temperature. This approach for quantifying the onset of disorder and structural phase transitions should be relevant to a wide range of lipid‐based systems.

show abstract

Section: Resultssupporting

confidence: 85%

Quantifying alkyl chain disorder in crystalline models of lipid bilayers using Raman spectroscopy

Rich

Bhattacharyya

Aldilla

et al. 2018

J Raman Spectroscopy

View full text Add to dashboard Cite

show abstract

“…6a) under aggregated forms (dimers and higher multimers noted D and R, as residue, respectively) and methylamine (CH 3 NH 2 ) (Fig. 6b) as deduced from comparison with spectra of the respective pure samples 27, 39. The infrared spectra corresponding to these two products do not succeed to reproduce the difference spectrum of the irradiated sample.…”

Section: Resultsmentioning

confidence: 92%

How a usual carbamate can become an unusual intermediate: a new chemical pathway to form glycinate in the interstellar medium

Bossa

Borget

Duvernay

et al. 2010

J of Physical Organic Chem

View full text Add to dashboard Cite

show abstract

“…(1) (Waldron 1953;Cabana & Sandorfy 1962;Castellucci 1974;Bossa et al 2008a); (2) (Rosado et al 1998); (3) (Bossa et al 2008a;Durig et al 1968); (4) (Bossa et al 2008a). Comments: Vibration mode: stretching (ν), bending (δ) and twisting (tw).…”

Section: Formation Of Methylammonium Methylcarbamate (C) In a Water-dmentioning

confidence: 99%

“…4a) and methylamine (CH 3 NH 2 ) (Fig. 4b) by comparing the infrared spectra of the respective pure samples (Bossa et al 2008a;Durig et al 1968). The formation of both products is consistent with a proton transfer induced by ultraviolet photons from methylammonium cation [CH 3 NH + 3 ] to methylcarbamate anion [CH 3 NHCOO − ] as described below:…”

Section: Photolysis Of Pure Methylammonium Methylcarbamate (C) At Lowmentioning

confidence: 99%

Methylammonium methylcarbamate thermal formation in interstellar ice analogs: a glycine salt precursor in protostellar environments

Bossa¹,

Duvernay²,

Theulé³

et al. 2009

A&A

View full text Add to dashboard Cite

Context. Analyses of dust cometary grains collected by the Stardust spacecraft have shown the presence of amines and amino acids molecules, and among them glycine (NH 2 CH 2 COOH). We show how the glycine molecule could be produced in the protostellar environments before its introduction into comets. Aims. We study the evolution of the interstellar ice analogues affected by both thermal heating and vacuum ultraviolet (VUV) photons, in addition to the nature of the formed molecules and the confrontation of our experimental results with astronomical observations. Methods. Infrared spectroscopy and mass spectrometry are used to monitor the evolution of the H 2 O:CO 2 :CH 3 NH 2 and CO 2 :CH 3 NH 2 ice mixtures during both warming processes and VUV photolysis. Results. We first show how carbon dioxide (CO 2 ) and methylamine (CH 3 NH 2 ) thermally react in water-dominated ice to form methylammonium methylcarbamate [CH 3 NH + 3 ][CH 3 NHCOO − ] noted C. We then determine the reaction rate and activation energy. We show that C thermal formation can occurs in the 50-70 K temperature range of a protostellar environment. Secondly, we report that a VUV photolysis of a pure C sample produces a glycine salt, methylammonium glycinate [CH 3 NH + 3 ][NH 2 CH 2 COO − ] noted G. We propose a scenario explaining how C and subsequently G can be synthesized in interstellar ices and precometary grains. Conclusions. [CH 3 NH + 3 ][CH 3 NHCOO − ] could be readily formed and would act as a glycine salt precursor in protostellar environments dominated by thermal and UV processing. We propose a new pathway leading to a glycine salt, which is consistent with the detection of glycine and methylamine within the returned samples of comet 81P/Wild 2 from the Stardust mission.

show abstract

Infrared and Raman Investigation of Condensed Phases of Methylamine and Its Deuterium Derivatives

Cited by 82 publications

References 27 publications

Quantifying alkyl chain disorder in crystalline models of lipid bilayers using Raman spectroscopy

Quantifying alkyl chain disorder in crystalline models of lipid bilayers using Raman spectroscopy

How a usual carbamate can become an unusual intermediate: a new chemical pathway to form glycinate in the interstellar medium

Methylammonium methylcarbamate thermal formation in interstellar ice analogs: a glycine salt precursor in protostellar environments

Contact Info

Product

Resources

About