Dynamic Structure of Organic Compounds in Solution According to NMR Data and Quantum Mechanical Calculations. V. Substituted Benzalanilines
- 作者: Stanishevsky V.V.1, Shestakova A.K.2, Chertkov V.A.1
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隶属关系:
- Lomonosov Moscow State University
- State Scientific Research Institute of Chemistry and Technology of Organoelement Compounds
- 期: 卷 61, 编号 1 (2025)
- 页面: 55-68
- 栏目: ЭКСПЕРИМЕНТАЛЬНЫЕ СТАТЬИ
- URL: https://journal-vniispk.ru/0514-7492/article/view/291850
- DOI: https://doi.org/10.31857/S0514749225010039
- EDN: https://elibrary.ru/AFZGYW
- ID: 291850
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详细
We investigated the dynamic structure of benzalaniline derivatives, in which an important factor is the inhibited internal rotation of benzene rings. The parameters of conformational processes of this type are characterized based on NMR spectroscopy data and quantum mechanical calculations. In these compounds, nitrogen atoms play a key role. It has been shown that important information is provided by NMR parameters with the direct participation of nitrogen, which become available in experiments with 15N-enriched compounds. Important new information about the conformation of molecules of this class can be provided by the spin-spin interaction constants involving 15N nuclei. A series of [15N]enriched benzalaniline derivatives with substituents in the ortho position of the benzene ring distant from the nitrogen was studied. It has been shown that substituents can act as both a stabilizing (R = F, OH, OCH3) and a destabilizing factor (R = CH3). The influence of medium acidity on these conformational equilibria was studied. This type of structural motif can be used to design pH-induced molecular switches. According to our estimates, the molecular switching energy of [15N]-2-fluorobenzalaniline is ~7 kcal/mol, which is one of the highest values for molecular switches of this type.
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作者简介
V. Stanishevsky
Lomonosov Moscow State University
Email: vchertkov@hotmail.com
ORCID iD: 0009-0004-5955-8233
俄罗斯联邦, 1, Leninskie Gory, Moscow, 119991
A. Shestakova
State Scientific Research Institute of Chemistry and Technology of Organoelement Compounds
编辑信件的主要联系方式.
Email: vchertkov@hotmail.com
ORCID iD: 0000-0002-2252-6914
俄罗斯联邦, 38, Enthusiastov Hwy, Moscow, 105118
V. Chertkov
Lomonosov Moscow State University
Email: vchertkov@hotmail.com
ORCID iD: 0000-0001-8699-5894
俄罗斯联邦, 1, Leninskie Gory, Moscow, 119991
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