DL-丙氨酸晶体粉末的拉曼光谱研究

Raman Scattering Study of DL-Alanine

拉曼光谱可作为研究分子晶体中分子振动和晶格振动的重要手段。DL丙氨酸晶体和L丙氨酸晶体晶胞参数相近,结构上同属于正交晶系,但它们的空间群不同,L丙氨酸晶体的空间群是P212121,而DL丙氨酸晶体则是Pna21。前人的工作详细研究了L丙氨酸晶体的拉曼光谱。文章通过对DL丙氨酸晶体粉末的拉曼光谱研究,和相同条件下D和L丙氨酸晶体粉末的拉曼光谱比较,获得了有关DL丙氨酸晶体中氢键作用和分子构象的信息。

Studies of Raman vibration spectra are useful to obtaining information on biomolecular crystals. The cell dimensions of the L- and DL-alanine crystals are nearly identical, and both structures belong to the orthorhombie system, but the space group is P212121 for the L-isomer, and Pna21 for the raeemate crystal. The Raman spectrum of L-alanine has been measured by many authors, The present work is focusing on the Raman scattering study of DL-alanine powder. Based on the analysis of the differences between DL-alanine and L-alanine Raman spectra, the authors obtained indispensable information on hydrogen bond and the motion of the molecular conformation in alanine crystals.