Local Structures and Chemical Properties of Deprotonated Arginine |
| |
Authors: | Hong-bao Li Zi-jing Lin Yi Luo |
| |
Affiliation: | 1.Hefei National Laboratory for Physical Sciences at the Microscale and Department of Physics,University of Science and Technology of China, Hefei 230026, China;Department of Theoretical Chemistry and Biology, School of Biotechnology, Royal Institute of Tec2.Hefei National Laboratory for Physical Sciences at the Microscale and Department of Physics,University of Science and Technology of China, Hefei 230026, China |
| |
Abstract: | The potential energy surface of gaseous deprotonated arginine has been systematically in- vestigated by first principles calculations. At the B3LYP/6-31G(d) level, apart from the identification of several stable local structures, a new global minimum is located which is about 6.56 kJ/mol more stable than what has been reported. The deprotonated arginine molecule has two distinct forms with the deprotonation at the carboxylate group (COO-). These two forms are bridged by a very high energy barrier and possess very different IR spectral profiles. Our calculated proton dissociation energy and gas-phase acidity of argi-nine molecule are found to be in good agreement with the corresponding experimental results. The predicted geometries, dipole moments, rotational constants, vertical ionization energies and IR spectra of low energy conformers will be useful for future experimental measurements. |
| |
Keywords: | Deprotonated arginine Energy barrier IR spectrum Gas-phase acidity |
|
| 点击此处可从《化学物理学报(中文版)》浏览原始摘要信息 |
|
点击此处可从《化学物理学报(中文版)》下载免费的PDF全文 |
|