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Citation: WANG Wen-qing, MIN Wei, NG Yan. Temperature- induced Phase Transitions in Chiral Amino Acids——Search of Spontaneous Parity- Breaking and Restoration[J]. Acta Physico-Chimica Sinica, ;2005, 21(10): 1186-1194. doi: 10.3866/PKU.WHXB20051026 shu

Temperature- induced Phase Transitions in Chiral Amino Acids——Search of Spontaneous Parity- Breaking and Restoration

1.
Department of Applied Chemistry, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871

Received Date: 14 March 2005
Available Online: 15 October 2005

The effects of temperature on the parity-violating entropy and energy differences of chiral molecules are investigated both theoretically and experimentally. Statistical thermodynamics calculations indicate the possible occur-rence of sign reversal of parity-violating entropy difference at different temperatures, which is supported by temperature-dependent polarized Raman spectra of D-alanine and L-alanine. An incoherent spontaneous symmetry breaking is proposed to describe the bifurcation mechanism between mirror-image systems at the critical temperature, in which usually violated parity symmetry will be dynamically restored again. An asymmetric double-well potential with a tiny parity-violating energy difference (PVED) in the depths of the two potential wells showed that the presence of PVED can lead to the enrichment of L-form amino acid. Tunneling dynamics of amino acids with PVED provides a plausible mechanism for much faster development of homochirality.
- Temperature effect;Temperature-conformation-PVED relation;Parity-violating entropy difference;Tunneling dynamics;Alanine enantiomers
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