ICCAS OpenIR
The tautomerization of H2NCH2C(OH)NH to H2NCH2CONH2 in the interstellar medium
Xu SiChuan1,2; Deng ShengRong1; Ma LiYing1; Shi Qiang1; Zhang XingKang1; Ge MaoFa1
2011
Source PublicationSCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
ISSN1674-7348
Volume54Issue:1Pages:156-163
AbstractThe tautomerization of H2NCH2C(OH)NH to H2NCH2CONH2 is an important step by way of Strecker synthesis for the production of glycine in the interstellar medium (ISM) with respect to the origin of amino acids on the early Earth. Our work indicates two mechanisms for the tautomerization to occur. k(CVT/SCT) (rate constant) is 45.6 s(-1) at 50 K, obtained with the small curvature tunneling (SCT) approximation and canonical variational transition state theory (CVT), to support one mechanism assisted by quantum tunneling in the ISM. Another mechanism is through the (H2O)(2)-coupled proton transfer. In the (H2O)(2)-coupled reaction, two H2O molecules act as a catalyst to reduce the barrier energy by 23.7 kcal mol(-1), and cooperatively let a proton pass a hydrogen-bonded bridge composed of H2NCH2C(OH)NH with (H2O)(2). k(TST) is 8.08x10(-4) s(-1) at 100 K, calculated with TST kinetics, to demonstrate the mechanism. Therefore, the tautomerization is feasible in the ISM. H2NCH2C(OH)NH and H2NCH2CONH2 will be detected in the ISM and found in carbonaceous chondrites. The results present new evidence for the third theory on the origin of amino acids on the early Earth.
KeywordH2nch2c(Oh)Nh H2nch2conh2 Interstellar Medium Amino Acid Origin Hydrogen Tunneling
DOI10.1007/s11433-010-4115-x
Indexed BySCI
Language英语
WOS IDWOS:000287765900024
PublisherSCIENCE PRESS
Citation statistics
Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.iccas.ac.cn/handle/121111/73512
Collection中国科学院化学研究所
Corresponding AuthorXu SiChuan
Affiliation1.Yunnan Univ, Lab Origin Life, Coll Chem Sci & Technol, Key Lab Minist Educ Med Chem Nat Resource, Kunming 650091, Peoples R China
2.Chinese Acad Sci, Inst Chem, Beijing Natl Lab Mol Sci, State Key Lab Struct Chem Unstable & Stable Speci, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Xu SiChuan,Deng ShengRong,Ma LiYing,et al. The tautomerization of H2NCH2C(OH)NH to H2NCH2CONH2 in the interstellar medium[J]. SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,2011,54(1):156-163.
APA Xu SiChuan,Deng ShengRong,Ma LiYing,Shi Qiang,Zhang XingKang,&Ge MaoFa.(2011).The tautomerization of H2NCH2C(OH)NH to H2NCH2CONH2 in the interstellar medium.SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY,54(1),156-163.
MLA Xu SiChuan,et al."The tautomerization of H2NCH2C(OH)NH to H2NCH2CONH2 in the interstellar medium".SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY 54.1(2011):156-163.
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