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	Parity violations on molecular chirality: neutron crystal-structure of d- and l-alanine
	Wang, WQ; Liu, YN; Gong, Y
刊名	Acta physico-chimica sinica
	2004-11-01
卷号	20期号:11页码:1345-1351
关键词	Parity violation Molecular chirality Neutron diffraction D- and l-alanine
ISSN号	1000-6818
DOI	10.3866/pku.whxb20041112
通讯作者	Wang, wq(wangwq@chem.pku.edu)
英文摘要	The role of chirality determines the origin of life that almost all amino acids utilized in living systems are of the l-type. starting from z(0) interactions, salam speculated on an explanation in terms of quantum mechanical cooperative and condensation phenomena where the electron-nucleon system has the same status as cooper-pairing, which could give rise to second-order phase transitions (including d to l transformations) below a critical temperature t-c (similar to250 k). neutron diffraction of single crystal d- and l-alanine was performed to look for the characteristic structural feature above and below the t, (295 k and 60 k) and the possibility of d- to l-type transformation. data analysis of the temperature effect on the crystal lattice together with the nh3+ torsional motion, parity-violating energy difference (delta e-pv) as a function of dihedral angle (omega), the co2 (theta) and nh3 (psi) torsion angles and the contribution of c-alpha - (ho)-o-... = c hydrogen bond is discussed. observation of the behavior of weak hydrogen bonding during the cooling process threw a light on the distinction between d- and l-alanine, which could be attributed to the parity-violating weak interactions. measurements of the neutron crystal-structure of d-alanine rule out the possibility of configuration transition to l-alanine, which means that salam phase transition is not a conventional structure transition.
WOS关键词	MIRROR-IMAGE MOLECULES ; ENERGY DIFFERENCE ; PHASE-TRANSITIONS ; ORIGIN
WOS研究方向	Chemistry
WOS类目	Chemistry, Physical
语种	英语
出版者	PEKING UNIV PRESS
WOS记录号	WOS:000225381400012
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2376866
专题	中国科学院大学
通讯作者	Wang, WQ
作者单位	Peking Univ, Coll Chem & Chem Engn, Dept Appl Chem, Beijing 100871, Peoples R China
推荐引用方式 GB/T 7714	Wang, WQ,Liu, YN,Gong, Y. Parity violations on molecular chirality: neutron crystal-structure of d- and l-alanine[J]. Acta physico-chimica sinica,2004,20(11):1345-1351.
APA	Wang, WQ,Liu, YN,&Gong, Y.(2004).Parity violations on molecular chirality: neutron crystal-structure of d- and l-alanine.Acta physico-chimica sinica,20(11),1345-1351.
MLA	Wang, WQ,et al."Parity violations on molecular chirality: neutron crystal-structure of d- and l-alanine".Acta physico-chimica sinica 20.11(2004):1345-1351.

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