1.白城师范学院理论计算中心,吉林 白城137000
2.白城师范学院传媒学院,吉林 白城 137000
3.白城师范学院物理学院,吉林 白城137000
4.中山大学环境学院, 广东 广州 510257
张雪娇(1987年生),女;研究方向:计算机应用化学;E-mail: 393866626@qq.com
杨晓翠(1965年生),女;研究方向:原子与分子物理; E-mail:yxc0622@163.com
纸质出版日期:2020-09-25,
收稿日期:2020-02-02,
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张雪娇,刘芳,吴梓昊等.丙氨酸Mg2+配合物的手性转变机理水分子(簇)的作用及水溶剂效应[J].中山大学学报(自然科学版),2020,59(05):156-168.
ZHANG Xuejiao,LIU Fang,WU Zihao,et al.Chiral transition mechanism of Mg2+and Ala complexes and effect of water molecules (clusters) and water solvents[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2020,59(05):156-168.
张雪娇,刘芳,吴梓昊等.丙氨酸Mg2+配合物的手性转变机理水分子(簇)的作用及水溶剂效应[J].中山大学学报(自然科学版),2020,59(05):156-168. DOI: 10.13471/j.cnki.acta.snus.2020.02.02.2020C003.
ZHANG Xuejiao,LIU Fang,WU Zihao,et al.Chiral transition mechanism of Mg2+and Ala complexes and effect of water molecules (clusters) and water solvents[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2020,59(05):156-168. DOI: 10.13471/j.cnki.acta.snus.2020.02.02.2020C003.
采用密度泛函理论的M06方法结合自洽反应场理论的SMD模型方法对标题反应进行了研究。研究发现:具有分子内单氢键的两性离子丙氨酸(Ala_1)与Mg
2+
二配位形成的螯合物
S
-A_1最稳定,具有分子内双氢键的中性Ala_2分子与Mg
2+
二配位形成的螯合物
S
-A_2的稳定性次之。
S
-A_1和
S
-A_2的手性转变都有3个通道。势能面研究表明:气相环境下,
S
-A_1和
S
-A_2手性转变优势通道的反应活化能分别是297.5和266.5 kJ/mol;在水分子(簇)的作用下
S
-A_1和
S
-A_2手性转变优势通道的反应活化能分别是157.9及165.7 kJ/mol;水溶剂环境下丙氨酸Mg
2+
螯合物主要以两性离子形式存在,手性转变优势通道的反应活化能为157.5 kJ/mol。结果表明,丙氨酸Mg
2+
螯合物可以很好地保持其手性特征,便于保存,可以作为理想的补充丙氨酸及镁离子的药品或营养品。
The title response was studied using the M06 method based on density functional theory and SMD model method combined with self-consistent reaction field theory. The study showed that the zwitterionic chelate
S
-A_1 formed by alanine (Ala_1) and Mg
2+
di-coordination with intramolecular single hydrogen bond is the most stable. The neutral ion chelate
S
-A_2 formed by the double coordination of Ala_2 and Mg
2+
with intramolecular double hydrogen bond is the second stable. The chiral transition of both
S
-A_1 and
S
-A_2 has three pathways. Potential energy surface studies showed that the chiral transition dominant pathways activation energies of
S
-A_1 and
S
-A_2 are 297.5 kJ·mol
-1
and 266.5 kJ·mol
-1
respectively in gas phase
and are 157.9 kJ·mol
-1
and 165.7 kJ·mol
-1
respectively with the effect of water molecules (clusters). Alanine and Mg
2+
chelates exist mainly in the form of zwitterions in water solvent environment
and the chiral transition dominant pathways activation energies are 157.5 kJ·mol
-1
. The results showed that the alanine and Mg
2+
chelate can maintain its chiral characteristics well and is easy to be preserved. It can be used as an ideal medicine or nutrition supplement for alanine and magnesium ions.
丙氨酸镁离子手性转变密度泛函理论过渡态自洽反应场理论能垒
α-alanine(α-Ala)magnesium ion (Mg2+)chiral transitiondensity functional theorytransition stateself-consistent reaction field theoryenergy barrier
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