Extensive Computational Study on Conformations of Microsolvated Leucine Complexes  

水合亮氨酸构型的系统寻找与研究

作　　者：刘莎[1] 胡安东[1] 林子敬[1] 

机构地区：[1]中国科学技术大学物理系,合肥230026

出　　处：《Chinese Journal of Chemical Physics》2012年第4期409-418,I0003,共11页化学物理学报（英文）

基　　金：V. ACKNOWLEDGMENTS This work was supported by the National Natural Science Foundation of China （No.11074233） the National Basic Research Program of China （No.2012CB215405）, and the Specialized Research Fund for the Doctoral Program of Higher Education （No.20113402110038）.

摘　　要：The conformations for leucine （Leu） hydrated with one to three water molecules, Leu-（H2O）n （n=1-3）, were carefully searched by considering the trial structures generated by all possible combinations of rotamers of Leu combined with all likely hydration modes. The structures were optimized at the BHandHLYP/6-31＋G^＊ level and the single point energies were calculated at the BHandHLYP/6-311＋＋G^＊＊ level. Good correspondence between the conformations of Leu-（H2O）n and bare Leu is found, showing that the conformations of Leu-（H2O）n may be efficiently and reliably determined by the hydration of Leu conformers. The simulated IR spectra of canonical and zwitterionic conformers of Leu-（H2O）n are compared with the experimental result of Leu in aqueous solution. The IR spectrum of zwitterionic Leu- （H2O）3 provides the best description of the experiment. The result demonstrates that the IR spectrum of solute in solution may be simulated by the solute hydrated with an adequate number of water molecules in the gas phase.

关 键 词：Amino acid Hydration effect First principle calculation Potential energy surface IR spectrum 

分 类 号：O[理学]