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Ganguly A. Effect of proximal electronegative functionalities on the energetics of strained hydrogen bonds: A computational investigation. COMPUT THEOR CHEM 2022. [DOI: 10.1016/j.comptc.2022.113887] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Batista PR, Karas LJ, Viesser RV, de Oliveira CC, Gonçalves MB, Tormena CF, Rittner R, Ducati LC, de Oliveira PR. Dealing with Hydrogen Bonding on the Conformational Preference of 1,3-Aminopropanols: Experimental and Molecular Dynamics Approaches. J Phys Chem A 2019; 123:8583-8594. [PMID: 31517493 DOI: 10.1021/acs.jpca.9b05619] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
This study expands the knowledge on the conformational preference of 1,3-amino alcohols in the gas phase and in solution. By employing Fourier transform infrared spectroscopy, nuclear magnetic resonance (NMR) spectroscopy, density functional theory (DFT) calculations, quantum theory of atoms in molecules (QTAIM), natural bond orbital (NBO) analysis, and molecular dynamics (MD), the compounds 3-aminopropan-1-ol (1), 3-methylaminopropan-1-ol (2), and 3-dimethylaminopropan-1-ol (3) are evaluated. The results show that the most stable conformation of each compound in the gas phase and in nonpolar solvents exhibited an O-H···N intramolecular hydrogen bond (IHB). Based on the experimental and theoretical OH-stretching frequencies, the IHB becomes stronger from 1 to 3. In addition, from the experimental NMR J-couplings, the IHB conformers are predominant in nonbasic solvents, representing 70-80% of the conformational equilibrium, while in basic solvents, such conformers only represent 10%. DFT calculations and QTAIM analysis in the gas phase support the occurrence of IHBs in these compounds. The MD simulation indicates that the non-hydrogen-bonded conformers are the lowest energy conformations in the solution because of molecular interactions with the solvent, while they are absent in the implicit solvation model based on density. NBO analysis suggests that methyl groups attached on the nitrogen atom affect the charge transfer energy involved in the IHB. This effect occurs mostly because of a decrease in the s-character of the LPN orbital along with weakening of the charge transfer from LPN to σ*OH, which is caused by an increase in the C-C-N bond angle.
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Affiliation(s)
- Patrick R Batista
- Department of Fundamental Chemistry, Institute of Chemistry , University of São Paulo , Av. Prof. Lineu Prestes , P.O. Box 748, 05508-000 São Paulo , São Paulo , Brazil
| | - Lucas J Karas
- Department of Chemistry , University of Houston , Houston , Texas 77204 , United States
| | - Renan V Viesser
- Physical Organic Chemistry Laboratory, Institute of Chemistry , University of Campinas , P.O. Box 6154, 13083-970 Campinas , São Paulo , Brazil
| | - Cynthia C de Oliveira
- Academic Department of Physics , Federal Technological University of Paraná , 80230-901 Curitiba , Paraná , Brazil
| | - Marcos B Gonçalves
- Academic Department of Physics , Federal Technological University of Paraná , 80230-901 Curitiba , Paraná , Brazil
| | - Cláudio F Tormena
- Physical Organic Chemistry Laboratory, Institute of Chemistry , University of Campinas , P.O. Box 6154, 13083-970 Campinas , São Paulo , Brazil
| | - Roberto Rittner
- Physical Organic Chemistry Laboratory, Institute of Chemistry , University of Campinas , P.O. Box 6154, 13083-970 Campinas , São Paulo , Brazil
| | - Lucas C Ducati
- Department of Fundamental Chemistry, Institute of Chemistry , University of São Paulo , Av. Prof. Lineu Prestes , P.O. Box 748, 05508-000 São Paulo , São Paulo , Brazil
| | - Paulo R de Oliveira
- Conformational Analysis and Renewable Resources Laboratory, Department of Chemistry and Biology , Federal Technological University of Paraná , P.O. Box 5000, 81280-340 Curitiba , Paraná , Brazil
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Paul BK. Lack of resonance assistance in a classical intramolecular hydrogen bond: An exploration from quantum theory of atoms‐in‐molecules perspective. J PHYS ORG CHEM 2019. [DOI: 10.1002/poc.3999] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Bijan K. Paul
- Department of ChemistryMahadevananda Mahavidyalaya Barrackpore Kolkata India
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Ma Q, Li C, Jia X, He Y, Liu Y, Liu Y, Yang Y. Theoretical study on excited-state intramolecular proton transfer process of cyanide group substituted 2-(2-hydroxyphenyl)benzothiazole. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2019; 212:281-285. [PMID: 30660060 DOI: 10.1016/j.saa.2019.01.016] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2018] [Revised: 01/08/2019] [Accepted: 01/10/2019] [Indexed: 06/09/2023]
Abstract
In this work, the influence of cyanide group substituted on the excited-state intramolecular proton transfer of 2-(2-hydroxyphenyl)benzothiazole (HBT) has been theoretical studied. It is found that the intramolecular hydrogen bonds of HBT and its cyanide substituted derivatives are significantly strengthened in the first excited (S1) state, while this strengthening tends to decrease with the substitution of cyano group. The natural population analysis (NPA) is performed to interpret this phenomenon and the calculated results show that the introduction of cyano groups induces intramolecular charge transfer, leading to the decrease of electrostatic interaction of intramolecular hydrogen bond in the S1 state compared to isolated HBT. Therefore, proton transfer of HBT and its derivatives become difficult with the introduction of cyano groups, which is consistent with the calculated potential barriers (1.95, 2.71 and 2.81 kcal/mol respectively) of the three molecules in the S1 state. This work interprets the hindrance of cyanide group on the proton transfer of HBT and its derivatives in the S1 state, which will bring new insight into the study of analogous molecular system.
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Affiliation(s)
- Qianfei Ma
- College of Physics and Materials Science, Henan Normal University, Xinxiang 453007, China
| | - Chaozheng Li
- College of Physics and Materials Science, Henan Normal University, Xinxiang 453007, China
| | - Xueli Jia
- College of Physics and Materials Science, Henan Normal University, Xinxiang 453007, China
| | - Yuanyuan He
- College of Physics and Materials Science, Henan Normal University, Xinxiang 453007, China
| | - Yang Liu
- College of Physics and Materials Science, Henan Normal University, Xinxiang 453007, China
| | - Yufang Liu
- College of Physics and Materials Science, Henan Normal University, Xinxiang 453007, China.
| | - Yonggang Yang
- College of Physics and Materials Science, Henan Normal University, Xinxiang 453007, China.
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