Microwave spectra of two conformers of the (1R)-(–)-nopol monomer

Microwave spectra of two conformers of the (1R)-(–)-nopol monomer
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(1R)-(-)-nopol单体的两种构象异构体的微波谱

DOI:
10.1016/j.jms.2022.111705
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发表时间:
2022
影响因子:
1.4
通讯作者:
Grubbs, Garry S
Grubbs, Garry S
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Sedo, Galen;Duerden, Amanda;Marshall, Frank E.;Moon, Nicole T.;Grubbs, Garry S

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用CP-FTMW光谱法在6-18 GHz范围内观察到了(1 R)-(-)-诺卜醇单体的转动光谱。已观察到两个不同的构象的父同位素体的过渡和分配。对单体进行的密度泛函理论(DFT)计算预测了九种不同的低能重原子几何结构。这些结构之间的差异归因于重原子R-CH 2CH 2 OH官能化中两个二面角取向的变化,其中R是指分子的固定双环笼组分。进一步优化这些几何形状发现27个不同的构象与羟基氢取向。两个最低能量构象的转动常数被发现是在很好的协议与实验常数的两个观察到的构象和预测的偶极矩分量同意所观察到的跃迁的相对强度。
The rotational spectrum of the (1R)-(-)-nopol monomer has been observed in the 6–18 GHz region using CP-FTMW spectroscopy. Transitions of two distinct conformers of the parent isotopologue have been observed and assigned. Density Functional Theory (DFT) calculations performed on the monomer predict nine distinct low-energy heavy atom geometries. The differences between these structures are attributed to changes in the orientation of two dihedral angles in the heavy atom R-CH2CH2OH functionalization, where R refers to the fixed bicyclic cage component of the molecule. Further optimization of these geometries found 27 distinct conformers associated with the hydroxyl hydrogen orientation. The rotational constants of the two lowest energy conformers were found to be in good agreement with the experimental constants of the two observed conformers and the predicted dipole moment components agree with the relative intensities of the observed transitions.
(1R)-(−)-桃金娘烯醇单体中观察到的低能构象异构体的旋转光谱
DOI: --
发表时间: 2019
影响因子: 1.4
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