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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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Braga CB, Silva WGDP, Rittner R. Conformational preferences of N-acetyl-N′-methylprolineamide in different media: a 1H NMR and theoretical investigation. NEW J CHEM 2019. [DOI: 10.1039/c8nj05035j] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The conformational preferences and role of non-covalent interactions on the geometries of Ac–Pro–NHMe were elucidated in isolated phase and solution.
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Affiliation(s)
- Carolyne B. Braga
- Institute of Chemistry
- University of Campinas
- Campinas
- São Paulo 13083-970
- Brazil
| | | | - Roberto Rittner
- Institute of Chemistry
- University of Campinas
- Campinas
- São Paulo 13083-970
- Brazil
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Silva WGDP, Tormena CF, Rittner R. Revealing the Conformational Preferences of Proteinogenic Glutamic Acid Derivatives in Solution by 1H NMR Spectroscopy and Theoretical Calculations. J Phys Chem A 2018; 122:4555-4561. [DOI: 10.1021/acs.jpca.8b02523] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Weslley G. D. P. Silva
- Chemistry Institute, University of Campinas, Campinas, São Paulo 13083-970, Brazil
- Department of Chemistry, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada
| | - Cláudio F. Tormena
- Chemistry Institute, University of Campinas, Campinas, São Paulo 13083-970, Brazil
| | - Roberto Rittner
- Chemistry Institute, University of Campinas, Campinas, São Paulo 13083-970, Brazil
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Silva WGDP, Braga CB, Rittner R. Conformational study of L-methionine and L-cysteine derivatives through quantum chemical calculations and 3JHH coupling constant analyses. Beilstein J Org Chem 2017; 13:925-937. [PMID: 28684974 PMCID: PMC5480334 DOI: 10.3762/bjoc.13.94] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2017] [Accepted: 04/27/2017] [Indexed: 12/29/2022] Open
Abstract
The understanding of the conformational behavior of amino acids and their derivatives is a challenging task. Here, the conformational analysis of esterified and N-acetylated derivatives of L-methionine and L-cysteine using a combination of 1H NMR and electronic structure calculations is reported. The geometries and energies of the most stable conformers in isolated phase and taking into account the implicit solvent effects, according to the integral equation formalism polarizable continuum model (IEF-PCM), were obtained at the ωB97X-D/aug-cc-pVTZ level. The conformational preferences of the compounds in solution were also determined from experimental and theoretical 3JHH coupling constants analysis in different aprotic solvents. The results showed that the conformational stability of the esterified derivatives is not very sensitive to solvent effects, whereas the conformational equilibrium of the N-acetylated derivatives changes in the presence of solvent. According to the natural bond orbital (NBO), quantum theory of atoms in molecules (QTAIM) and noncovalent interactions (NCI) methodologies, the conformational preferences for the compounds are not dictated by intramolecular hydrogen bonding, but by a joint contribution of hyperconjugative and steric effects.
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Affiliation(s)
- Weslley G D P Silva
- Chemistry Institute, University of Campinas, P.O. Box 6154, 13083−970, Campinas, SP, Brazil
| | - Carolyne B Braga
- Chemistry Institute, University of Campinas, P.O. Box 6154, 13083−970, Campinas, SP, Brazil
| | - Roberto Rittner
- Chemistry Institute, University of Campinas, P.O. Box 6154, 13083−970, Campinas, SP, Brazil
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Braga CB, Rittner R. Combined Utilization of 1H NMR, IR, and Theoretical Calculations To Elucidate the Conformational Preferences of Some l-Histidine Derivatives. J Phys Chem A 2017; 121:729-740. [DOI: 10.1021/acs.jpca.6b12515] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Carolyne B. Braga
- Chemistry Institute, University of Campinas, P.O. Box 6154, 13083-970 Campinas, SP, Brazil
| | - Roberto Rittner
- Chemistry Institute, University of Campinas, P.O. Box 6154, 13083-970 Campinas, SP, Brazil
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Tormena CF. Conformational analysis of small molecules: NMR and quantum mechanics calculations. PROGRESS IN NUCLEAR MAGNETIC RESONANCE SPECTROSCOPY 2016; 96:73-88. [PMID: 27573182 DOI: 10.1016/j.pnmrs.2016.04.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Revised: 04/14/2016] [Accepted: 04/14/2016] [Indexed: 06/06/2023]
Abstract
This review deals with conformational analysis in small organic molecules, and describes the stereoelectronic interactions responsible for conformational stability. Conformational analysis is usually performed using NMR spectroscopy through measurement of coupling constants at room or low temperature in different solvents to determine the populations of conformers in solution. Quantum mechanical calculations are used to address the interactions responsible for conformer stability. The conformational analysis of a large number of small molecules is described, using coupling constant measurements in different solvents and at low temperature, as well as recent applications of through-space and through-hydrogen bond coupling constants JFH as tools for the conformational analysis of fluorinated molecules. Besides NMR parameters, stereoelectronic interactions such as conjugative, hyperconjugative, steric and intramolecular hydrogen bond interactions involved in conformational preferences are discussed.
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Affiliation(s)
- Cláudio F Tormena
- Institute of Chemistry, University of Campinas, PO Box 6154, 13083-970 Campinas, Sao Paulo, Brazil.
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Cheng ZP, Wu QY, Liu YH, Lan JH, Wang CZ, Chai ZF, Shi WQ. The redox mechanism of Np VI with hydrazine: a DFT study. RSC Adv 2016. [DOI: 10.1039/c6ra13339h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
The probable reduction mechanisms of NpVI with N2H4 are investigated by proposing three probable pathways based on the results of theoretical calculations.
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Affiliation(s)
- Zhong-Ping Cheng
- Laboratory of Nuclear Energy Chemistry
- Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety
- Institute of High Energy Physics
- Chinese Academy of Sciences
- Beijing
| | - Qun-Yan Wu
- Laboratory of Nuclear Energy Chemistry
- Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety
- Institute of High Energy Physics
- Chinese Academy of Sciences
- Beijing
| | - Yun-Hai Liu
- School of Chemistry
- Biological and Materials Sciences
- East China University of Technology
- Nanchang 330013
- China
| | - Jian-Hui Lan
- Laboratory of Nuclear Energy Chemistry
- Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety
- Institute of High Energy Physics
- Chinese Academy of Sciences
- Beijing
| | - Cong-Zhi Wang
- Laboratory of Nuclear Energy Chemistry
- Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety
- Institute of High Energy Physics
- Chinese Academy of Sciences
- Beijing
| | - Zhi-Fang Chai
- Laboratory of Nuclear Energy Chemistry
- Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety
- Institute of High Energy Physics
- Chinese Academy of Sciences
- Beijing
| | - Wei-Qun Shi
- Laboratory of Nuclear Energy Chemistry
- Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety
- Institute of High Energy Physics
- Chinese Academy of Sciences
- Beijing
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