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.
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.
Density function theoretical study on the chiral flip of α-alanine Se(Ⅳ) complex in water-liquid phase environment
-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
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