1. 北京大学化学与分子工程学院，稀土材料化学与应用国家重点实验室, 北京 100871 2. Department of Chemistry, McGill University, 801 Sherbrooke Street West, Montreal, Canada H3A 2K6
Infrared and Raman Spectra Studies of DL-Homocysteic Acid (DLH) and Its Lanthanum Complex at High External Pressure
LI Wei-hong1, XU Zhen-hua1*, WU Jin-guang1, Butler I S2
1. State Key Laboratory of Rare Earth Material Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China 2. Department of Chemistry, McGill University, 801 Sherbrooke Street West，Montreal, Canada H3A 2K6
Abstract：DL-Homocysteic acid(DLH, (NH+3)-CH(COOH)-(CH2)2-SO-3) is extensively in existence as free amino-acid in the central nervous system of mammal. The infrared (IR) and Raman spectra of DL-Homocysteic acid (DLH) and its La complex [La(DLH)2Cl3·H2O=LaL2] were measured at high external pressure. The DLH has two pressure-induced phase transitions (near 17 kbar and 37 kbar) and three pressure-phase areas below 50 kbar for there are ten intermolecular hydrogen bonds between the DLH molecules. But there is only one pressure-induced phase transition (near 27 kbar ) to be observed in the complex LaL2. These show that the ten intermolecular hydrogen bonds of the DLH molecules changed due to the formation of complex LaL2. In infrared spectra, the changing trend of the pressure sensitivities (dν/dp) of symmetry stretching of SO-3 in DLH and asymmetry stretching of SO-3 in LaL2 are very different from the other vibrational modes when both compounds undergo high external pressure. In infrared spectra, the average pressure sensitivities of symmetry stretching of SO-3 are : low-pressure phase area (0.30 cm-1·(kbar)-1)＜middle-pressure phase area (0.32 cm-1·(kbar)-1)＜high-pressure phase area(0.41 cm-1·(kbar)-1), but 0.86 cm-1·(kbar)-1 (low-pressure phase area)＞0.64 cm-1·(kbar)-1 (middle-pressure phase area)＞0.26 cm-1·(kbar)-1 (high-pressure phase area) to other vibrational modes in DLH. The average pressure sensitivities of asymmetry stretching of SO-3 in LaL2 are lower in low-pressure phase area than in high-pressure phase area, but the average pressure sensitivities of other modes are higher in low-pressure phase area than in high-pressure phase area.
李维红1, 许振华1*, 吴瑾光1,Butler I S2 . 氨基酸DLH及其稀土镧配合物的高压红外和拉曼光谱研究[J]. 光谱学与光谱分析, 2005, 25(09): 1388-1392.
LI Wei-hong1, XU Zhen-hua1*, WU Jin-guang1, Butler I S2 . Infrared and Raman Spectra Studies of DL-Homocysteic Acid (DLH) and Its Lanthanum Complex at High External Pressure . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2005, 25(09): 1388-1392.
[1] Renno W M, Mullet M A，Beitz A J. Brain Research, 1992, 594: 221. [2] Osborne N N, Pergande G, Block F, et al. Brain Research, 1994, 667: 291. [3] Robert A, Jozsef I E，Laszlo S. Acta Neuropathologica, 2002, 103: 428. [4] Clarke G R，Steward E G. J. Cryst. Mol. Struct., 1977, 7: 41. [5] Santhosh-Kumar C R, Deutsch J C, Kolhouse J C, et al. Analytical Biochemistry, 1994, 220: 249. [6] ZHANG Xu, LI Wei-hong, JIA Hui-zhen, et al(张 煦，李维红，贾会珍，等). Spectroscopy and Spectral Analysis(光谱学与光谱分析), 2000, 20(2): 185. [7] Zhang Xu, M. D. Thesis in Chinese, Peking University. 2000. [8] XU Zhen-hua(许振华)，Mayr A, Butler Ian S. Spectroscopy and Spectral Analysis(光谱学与光谱分析)，2001, 21(5): 596. [9] Klug D D, Whalley E. Rev. Sci. Instrum., 1983, 54: 1205. [10] Ferraro J R. Vibrational Spectroscopy at High External Pressures. The Diamond Anvil Cell, Orlando：Academic Press, 1984. [11] Sharma S K, Mao H K, Bell P K, et al. J. Raman Spectrosc., 1985, 16: 350. [12] Markwell R D，Butler I S. Can. J. Chem., 1994, 73: 1019. [13] Nakamoto K. Infrared and Raman Spectra of Inorganic and Coordination Compounds. Part B: Applications in Coordination, Organometallic, and Bioinorganic Chemistry. Fifth Edition, John Wiley & Sons, Inc. 1997. [14] Colthup N B, Daly L H, Wiberley S E. Introduction to Infrared and Raman Spectroscopy. Third Edition, Academic Press Inc., 1990. [15] Lin-Vien D, Colthup N B, Fateley W G，et al. The Handbook of Infrared and Raman Characteristic Frequencies of Organic Molecules. Academic Press Inc., 1991. [16] Edwards C M，Butler Ian S. Coord. Chem. Rev., 2000, 199: 1. [17] Xu Zhenhua, Yan Zhanlan, Wu Jinguang, et al. Spectrochimica Acta, A，2003, 59: 2791.
