1.白城师范学院计算机科学学院,吉林 白城 137000
2.白城师范学院物理学院,吉林 白城 137000
3.白城市中心医院心血管内科,吉林 白城 137000
乔朝阳(1969年生)男;研究方向:计算机应用化学,E-mail:qcy@bcnu.edu.cn
杨晓翠(1965年生),女;研究方向:物理化学;E-mail:yxc@bcnu.edu.cn
王佐成(1963年生),男;研究方向:量子化学;E-mail:wzc@bcnu.edu.cn
纸质出版日期:2023-01-25,
网络出版日期:2022-06-07,
收稿日期:2021-12-31,
录用日期:2022-02-19
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乔朝阳,刘芳,张雪娇等.水液相下α-丙氨酸Se(Ⅳ)配合物手性翻转的密度泛函理论研究[J].中山大学学报(自然科学版),2023,62(01):149-160.
QIAO Chaoyang,LIU Fang,ZHANG Xuejiao,et al.Density function theoretical study on the chiral flip of α-alanine Se(Ⅳ) complex in water-liquid phase environment[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2023,62(01):149-160.
乔朝阳,刘芳,张雪娇等.水液相下α-丙氨酸Se(Ⅳ)配合物手性翻转的密度泛函理论研究[J].中山大学学报(自然科学版),2023,62(01):149-160. DOI: 10.13471/j.cnki.acta.snus.2022C001.
QIAO Chaoyang,LIU Fang,ZHANG Xuejiao,et al.Density function theoretical study on the chiral flip of α-alanine Se(Ⅳ) complex in water-liquid phase environment[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2023,62(01):149-160. DOI: 10.13471/j.cnki.acta.snus.2022C001.
采用密度泛函理论的M06和MN15方法,结合极化连续介质的SMD模型方法,研究了
S
-
α
-丙氨酸(
S
-
α
-Ala)与4价硒(Se(Ⅳ))配合物(Se(Ⅳ))的手性翻转机理。反应通道研究发现,
S-α
-Ala·Se(Ⅳ)可在
α
-H质子只以羰基O作媒介迁移;
α
-H质子向羰基O迁移后,质子再从氨基N向
α
-C迁移;质子从质子化氨基向羰基O迁移后,
α
-H质子再以氨基N作媒介迁移的3个通道上实现手性翻转。势能面计算表明:第3个反应通道最具优势,隐性水溶剂效应下的自由能垒是227.6 kJ/mol,来自于质子从氨基N向
α
-C迁移的过渡态;显性水溶剂效应下的自由能垒是155.6 kJ/mol,来自于质子从质子化氨基N向羰基O迁移的过渡态。结果表明:水液相下手性
α
-Ala·Se(Ⅳ)很难消旋,其用于生命体同补
α
-Ala和Se(Ⅳ)有较好的安全性。
The chiral flip mechanism of
S
-
α
-alanine(
S-α
-Ala) and tetravalent selenium(Se(Ⅳ)) complexes(
S-α
-Ala·Se(Ⅳ)) was studied by means of M06 and MN15 methods based on density functional theory and SMD model method of polarized continuum. The study of reaction channels shows that
S-α
-Ala·Se(Ⅳ)
can be transferred when the carbonyl O atom as the only medium of
α
-H proton; the proton transfers to
α
-C from amino group N after the
α
-H proton is transferred to carbonyl O atom; after the proton of protonated amino transfers to carbonyl O atom,
α
-H proton achieves chiral flip in three channels with amino group N as the medium of protolysis. Investigation on the potential energy surface shows that the third reaction channel has the most advantage, the free energy barrier is 227.6 kJ/mol
under the effect of recessive solvent, it comes from the transient state of the proton moving from amino group N to
α
-C; Under the dominant solvent effect, the free energy barrier is 155.6 kJ/mol, it comes from the transient state of the proton moving from protonated amino group N to carbonyl O atom. The results show that chiral
α
-Ala·Se(Ⅳ) is difficult to racemize in water-liquid phase, and thus it is relatively safe to be used to supply
α
-Ala and Se(Ⅳ)
for life simultaneously.
α-丙氨酸4价硒密度泛函理论手性翻转能垒
α-alaninetetravalent seleniumdensity functional theorychiral flipenergy barrier
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