LIU Fang,XIN Zhirong,FAN Yanjie,et al.The effect of water molecule (cluster) and aqueous solvent on proline copper(Ⅱ) enantiomerization[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2022,61(05):105-116.
LIU Fang,XIN Zhirong,FAN Yanjie,et al.The effect of water molecule (cluster) and aqueous solvent on proline copper(Ⅱ) enantiomerization[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2022,61(05):105-116. DOI: 10.13471/j.cnki.acta.snus.2021C018.
The effect of water molecule (cluster) and aqueous solvent on proline copper(Ⅱ) enantiomerization
The study investigated the effect of water molecule (cluster) and aqueous solvent on
S
-proline (Pro) divalent copper complex (
S
-Pro·Cu(II))enantiomerization under the gas phase using the methods of M06 and MN15 based on density functional theory combining with self-consistent reaction field of SMD model.The results showed that gas phase Cu
2+
and carbonyl O monodentate ligand is the most stable. The enantiomerization of
S
-Pro•Cu(Ⅱ) can be realized in 5 channels a, b, c, d and e. In channel a, b and c
α
-H transfers directly with O, Cu and N as a bridge respectively. After Cu and carbonyl O are bidentately coordinated
α
-H transfers with O and O and N unite as a bridge in channel c and d(
α
-H transfers with Cu as a bridge, it is hydrogen anion migration. The other is hydrogen proton migration). The potential energy surface calculation shows that the dominant pathways of the enantiomerization of isolated
S
-Pro•Cu(Ⅱ)
are pathways b and c, and the activation energy of the reaction is 153.4 and 160.3 kJ·mol
-1
respectively. The dominant pathway is channel c in the water vapor phase environment, and the activation energy of the reaction is 143.7 kJ·mol
-1
. Channel b is the most disadvantaged, and the enantiomerization in this channel cannot be achieved. The activation energy of channel c drops to 89.9 kJ·mol
-1
under the effect of aqueous solvent. The results show that Pro•Cu(Ⅱ) can maintain its chiral characteristics well in the gas phase, and is easy to be enantiomerized in the water vapor phase.
关键词
脯氨酸二价铜离子水分子(簇)水溶剂对映异构密度泛函理论过渡态能垒
Keywords
proline(Pro)cupric ion (Cu2+)water molecule (cluster)aqueous solventenantiomerizationdensity functional theorytransient stateenergy barrier
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