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本文利用太赫兹时域光谱技术测量了室温条件下无水L-天冬酰胺与L- 天冬酰胺一水合物的光谱特征，发现二者存在显著的差异，并利用太赫兹时域光谱技术实时检测L-天冬酰胺一水合物受热脱水的动态过程. 结果表明太赫兹波对晶体结构变化、含结晶水状况以及分子间弱相互作用敏感. 结合差示扫描量热法与热重分析联用、傅里叶变换红外光谱、粉末X射线衍射等多种技术分别从热学性质、分子振动等方面进行了表征，进一步确认了太赫兹实验结果的可靠性. 采用基于密度泛函理论（DFT）的第一性原理平面波赝势方法，结合广义梯度近似（GGA）下的PBE交换-关联泛函，对L-天冬酰胺一水合物进行模拟计算，对实验所得太赫兹光谱与分子结构以及相互作用间的关系进行了讨论分析.Low-frequency collective vibrational modes of biomolecules which often lie in terahertz (THz) band, make the terahertz time-domain spectroscopy (THz-TDS) an important technique for molecular identification and medicine quality inspection. Distinctive THz spectra between L-asparagine and its monohydrate were observed and the dehydration process of L-asparagine monohydrate was tracked by THz-TDS. Experiments indicate that THz wave is sensitive to phase transitions in crystals, dehydration process, and weak molecular interactions. Multi-techniques including differential scanning calorimetry and thermogravimetry, Fourier transform infrared spectroscopy, and powder X-ray diffraction are performed to investigate the thermodynamic properties, intermolecular and intramolecular vibrations, and molecular packing patterns of L-asparagine and its monohydrate. These measurements support the reliability of THz spectroscopy. To simulate and analyse the vibration modes of L-asparagine monohydrate, density functional theory calculations are performed using a Perdew Burke and Ernzerhof generalized gradient approach; the results agree well with the experimental observations.
[1] Qin J Y, Ying Y B, Xie L J 2013 Appl. Spectrosc. Rev. 48 439
[2] Huang Y H, Hu M, He G H, Liu W L 2013 Key Engineering Materials Qingdao, People's Republic China, September 28-30, 2012 p640
[3] Tian L, Zhao K, Zhou Q L, Shi Y L, Zhang C L 2012 Chin. Phys. Lett. 29 043901
[4] Tian L, Zhou Q L, Zhao K, Shi Y L, Zhao D M, Zhao S Q, Zhao H, Bao R M, Zhu S M, Miao Q, Zhang C L 2011 Chin. Phys. B 20 010703
[5] Zuo Z G, Wang P, Ling F R, Liu J S, Yao J Q 2013 Chin. Phys. B 22 097304
[6] Chen S, Fan F, Chang S J, Miao Y P, Chen M, Li J N, Wang X H, Lin L 2014 Opt. Express 22 6313
[7] Wang W N, Wang G, Zhang Y 2011 Chin. Phys. B 20 123301
[8] Du S Q, Li H, Xie L, Chen L, Peng Y, Zhu Y M, Li H, Dong P, Wang J T 2012 Appl. Phys. Lett. 100 143702
[9] Du Y, Xia Y, Zhang H L, Hong Z 2013 Spectrochim. Acta A 111 192
[10] Zheng Z P, Fan W H, Li H, Tang J 2014 J. Mol. Spectrosc. 296 9
[11] Wu H Q, Khan M 2012 J. Mol. Struct. 1020 112
[12] Liu H B, Chen Y Q, Zhang X C 2007 J. Pharm. Sci. 96 927
[13] Liu H B, Zhang X C 2006 Chem. Phys. Lett. 429 229
[14] Hisazumi J, Suzuki T, Wakiyama N, Nakagami H, Terada K 2012 Chem. Pharm. Bull. 60 831
[15] Li J, Wang Z Y, Yang X, Hu L, Liu Y W, Wang C X 2006 Thermochim. Acta 447 147
[16] Nishizawa J, Tanno T, Yoshida T, Suto K 2007 Chem. Lett. 36 134
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[19] Wang W N, Li H Q, Zhang Y, Zhang C L 2009 Acta Phys.-Chim. Sin. 25 2074 (in Chinese)[王卫宁, 李洪起, 张岩, 张存林 2009 物理化学学报 25 2074]
[20] Yan H, Fan W H, Zheng Z P 2012 Opt. Commun. 285 1593
[21] Wang X, Wang Q 2011 J. Phys.: Conf. Ser. 276 012224
[22] King M D, Korter T M 2011 J. Phys. Chem. A 115 14391
[23] Pellizzeri S, Smith T M, Delaney S P, Korter T M, Zubieta J 2014 J. Mol. Struct. 1058 265
[24] King M D, Buchanan W D, Korter T M 2011 J. Pharm. Sci. 100 1116
[25] Han J G, Zhang W L, Chen W, Thamizhmani L, Azad A K, Zhu Z Y 2006 J. Phys. Chem. B 110 1989
[26] Clark S J, Segall M D, Pickard C J, Hasnip P J, Probert M J, Refson K, Payne M C 2005 Z. Kristall. 220 567
[27] Ramanadham M, Sikka S K, Chidambaram R 1972 Acta Crystallogr. B 28 3000
[28] Perdew J P, Burke K, Ernzerhof M 1996 Phys. Rev. Lett. 77 3865
[29] Hamann D R, Schluter M, Chiang C 1979 Phys. Rev. Lett. 43 1494
[30] Fischer T H, Almlof J 1992 J. Phys. Chem. 96 9768
[31] Contineanu M, Neacsu A, Contineanu I, Perisanu S 2013 J. Radioanal. Nucl. Chem. 295 379
[32] Jain D, Chandra L S S, Bharadwaj S, Anwar S, Ganesan V, Lalla N P, Awasthi A M, Nath R 2010 IEEE T. Dielect. El. In. 17 1128
[33] Yamada K, Hashizume D, Shimizu T, Yokoyama S 2007 Acta Cryst. E 63 O3802
[34] Gražulis S, Daškevič A, Merkys A, Chateigner D, Lutterotti L, Quirós M, Serebryanaya N R, Moeck P, Downs R T, Le Bail A 2012 Nucleic Acids Res. 40 D420
[35] Moreno A J D, Freire P T C, Guedes I, Melo F E A, Mendes J, Sanjurjo J A 1999 Braz. J. Phys. 29 380
[36] Casado J, LóPez Navarrete J T, Ramírez F J 1995 J. Raman Spectrosc. 26 1003
[37] Matei A, Drichko N, Gompf B, Dressel M 2005 Chem. Phys. 316 61
[38] Yogam F, Potheher I V, Jeyasekaran R, Vimalan M, Arockiaraj M A, Sagayaraj P 2013 J. Therm. Anal. Calorim. 114 1153
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[1] Qin J Y, Ying Y B, Xie L J 2013 Appl. Spectrosc. Rev. 48 439
[2] Huang Y H, Hu M, He G H, Liu W L 2013 Key Engineering Materials Qingdao, People's Republic China, September 28-30, 2012 p640
[3] Tian L, Zhao K, Zhou Q L, Shi Y L, Zhang C L 2012 Chin. Phys. Lett. 29 043901
[4] Tian L, Zhou Q L, Zhao K, Shi Y L, Zhao D M, Zhao S Q, Zhao H, Bao R M, Zhu S M, Miao Q, Zhang C L 2011 Chin. Phys. B 20 010703
[5] Zuo Z G, Wang P, Ling F R, Liu J S, Yao J Q 2013 Chin. Phys. B 22 097304
[6] Chen S, Fan F, Chang S J, Miao Y P, Chen M, Li J N, Wang X H, Lin L 2014 Opt. Express 22 6313
[7] Wang W N, Wang G, Zhang Y 2011 Chin. Phys. B 20 123301
[8] Du S Q, Li H, Xie L, Chen L, Peng Y, Zhu Y M, Li H, Dong P, Wang J T 2012 Appl. Phys. Lett. 100 143702
[9] Du Y, Xia Y, Zhang H L, Hong Z 2013 Spectrochim. Acta A 111 192
[10] Zheng Z P, Fan W H, Li H, Tang J 2014 J. Mol. Spectrosc. 296 9
[11] Wu H Q, Khan M 2012 J. Mol. Struct. 1020 112
[12] Liu H B, Chen Y Q, Zhang X C 2007 J. Pharm. Sci. 96 927
[13] Liu H B, Zhang X C 2006 Chem. Phys. Lett. 429 229
[14] Hisazumi J, Suzuki T, Wakiyama N, Nakagami H, Terada K 2012 Chem. Pharm. Bull. 60 831
[15] Li J, Wang Z Y, Yang X, Hu L, Liu Y W, Wang C X 2006 Thermochim. Acta 447 147
[16] Nishizawa J, Tanno T, Yoshida T, Suto K 2007 Chem. Lett. 36 134
[17] Hangyo M 2005 in Fundamentals and Applications of Terahertz Wave (Tokyo: Kogyo Chosakai Publishing) pp 307-307
[18] Ma S H, Shi Y L, Xu X L, Yan W, Yang Y P, Wang L 2006 Acta Phys. Sin. 55 4091 (in Chinese)[马士华, 施宇蕾, 徐新龙, 严伟, 杨玉平, 汪力 2006 物理学报 55 4091]
[19] Wang W N, Li H Q, Zhang Y, Zhang C L 2009 Acta Phys.-Chim. Sin. 25 2074 (in Chinese)[王卫宁, 李洪起, 张岩, 张存林 2009 物理化学学报 25 2074]
[20] Yan H, Fan W H, Zheng Z P 2012 Opt. Commun. 285 1593
[21] Wang X, Wang Q 2011 J. Phys.: Conf. Ser. 276 012224
[22] King M D, Korter T M 2011 J. Phys. Chem. A 115 14391
[23] Pellizzeri S, Smith T M, Delaney S P, Korter T M, Zubieta J 2014 J. Mol. Struct. 1058 265
[24] King M D, Buchanan W D, Korter T M 2011 J. Pharm. Sci. 100 1116
[25] Han J G, Zhang W L, Chen W, Thamizhmani L, Azad A K, Zhu Z Y 2006 J. Phys. Chem. B 110 1989
[26] Clark S J, Segall M D, Pickard C J, Hasnip P J, Probert M J, Refson K, Payne M C 2005 Z. Kristall. 220 567
[27] Ramanadham M, Sikka S K, Chidambaram R 1972 Acta Crystallogr. B 28 3000
[28] Perdew J P, Burke K, Ernzerhof M 1996 Phys. Rev. Lett. 77 3865
[29] Hamann D R, Schluter M, Chiang C 1979 Phys. Rev. Lett. 43 1494
[30] Fischer T H, Almlof J 1992 J. Phys. Chem. 96 9768
[31] Contineanu M, Neacsu A, Contineanu I, Perisanu S 2013 J. Radioanal. Nucl. Chem. 295 379
[32] Jain D, Chandra L S S, Bharadwaj S, Anwar S, Ganesan V, Lalla N P, Awasthi A M, Nath R 2010 IEEE T. Dielect. El. In. 17 1128
[33] Yamada K, Hashizume D, Shimizu T, Yokoyama S 2007 Acta Cryst. E 63 O3802
[34] Gražulis S, Daškevič A, Merkys A, Chateigner D, Lutterotti L, Quirós M, Serebryanaya N R, Moeck P, Downs R T, Le Bail A 2012 Nucleic Acids Res. 40 D420
[35] Moreno A J D, Freire P T C, Guedes I, Melo F E A, Mendes J, Sanjurjo J A 1999 Braz. J. Phys. 29 380
[36] Casado J, LóPez Navarrete J T, Ramírez F J 1995 J. Raman Spectrosc. 26 1003
[37] Matei A, Drichko N, Gompf B, Dressel M 2005 Chem. Phys. 316 61
[38] Yogam F, Potheher I V, Jeyasekaran R, Vimalan M, Arockiaraj M A, Sagayaraj P 2013 J. Therm. Anal. Calorim. 114 1153
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