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	氨基酸DLH及其稀土镧配合物的高压红外和拉曼光谱研究; Infrared and raman spectra studies of DL-homocysteic acid (DLH) and its lanthanum complex at high external pressure
	李维红 ; 许振华 ; 吴瑾光
	2005
关键词	红外光谱 拉曼光谱 氨基酸 高压 相变 压力灵敏度 infrared spectra Raman spectra DL-homocysteic acid high pressure phase transitions pressure sensitivity
英文摘要	测定了DL-2-氨基-4-磺酸基-丁酸[DLH,DL-Homocysteicacid,(NH3+)-CH(COOH)-(CH2)2-SO3-]及其稀土La配合物[La(DLH)2Cl3·H2O=LaL2]在不同压力下的红外和拉曼光谱。DLH在50kbar左右压力以下存在两个压力诱导相转变区,它们分别在17和37kbar左右,两者均为二级相转变,认为分子间氢键的存在是出现两个压力诱导相转变区的原因。在红外光谱中,SO3-的对称伸缩振动的压力灵敏度(dν/dp)表现出与其他振动模式不同的变化趋势,它们在低压相区的平均压力灵敏度为0.30cm-1·(kbar)-1、中压相区为0.32cm-1.(kb...; DL-Homocysteic acid (DLH, (NH3 )-CH(COOH)-(CH2 )2-SO3-) 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 (dv/dp) of symmetry stretching of SO3- in DLH and asymmetry stretching of SO3- 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 SO3- are: low-pressure phase area (0.30 cm(-1) x (kbar)(-1)) < middle-pressure phase area (0.32 cmn(-1) (kbar) (-1)) < high-pressure phase area (0.41 cm(-1) x (kbar)(-1)), but 0.86 cm(-1) x (kbar)(-1) (low-pressure phase area) >0.64 cm(-1) x (kbar)(-1) (middle-pressure phase area) >0.26 cm(-1) x (kbar)(-1) (high-pressure phase area) to other vibrational modes in DLH. The average pressure sensitivities of asymmetry stretching of SO3- 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.; http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000232296200004&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701 ; SCI(E); EI; PubMed; 中文核心期刊要目总览(PKU); 中国科技核心期刊(ISTIC); 中国科学引文数据库(CSCD); 2; 09; 1388-1392; 25
语种	中文
出处	知网 ; 万方 ; PubMed ; SCI
出版者	光谱学与光谱分析
内容类型	其他
源URL	[http://hdl.handle.net/20.500.11897/77930]
专题	化学与分子工程学院
推荐引用方式 GB/T 7714	李维红,许振华,吴瑾光. 氨基酸DLH及其稀土镧配合物的高压红外和拉曼光谱研究, Infrared and raman spectra studies of DL-homocysteic acid (DLH) and its lanthanum complex at high external pressure. 2005-01-01.

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