物理化学学报2004，Vol.20Issue(11)：1345-1351,7.
手性分子中的宇称破缺:D-和L-丙氨酸的变温中子结构研究
Parity Violations on Molecular Chirality:Neutron Crystal-Structure of D- and L-alanine
摘要
Abstract
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 Z0 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 Tc( ～250 K).Neutron diffraction of single crystal D- and L-alanine was performed to look for the characteristic structural feature above and below the Tc (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 (△ EPV) as a gen 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.关键词
宇称破缺/分子手性/中子衍射/D-和L-丙氨酸Key words
Parity violation/Molecular chirality/Neutron diffraction/D- and L-alanine分类
化学化工引用本文复制引用
王文清,刘轶男,龚(龙天)..手性分子中的宇称破缺:D-和L-丙氨酸的变温中子结构研究[J].物理化学学报,2004,20(11):1345-1351,7.基金项目
国家高技术研究发展规划(863项目)(863-103-13-06-01),国家自然科学基金(20310202026)资助项目 （863项目）
