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Hudzik JM, Bozzelli JW, Asatryan R, Ruckenstein E. OH-Initiated Reactions of para-Coumaryl Alcohol Relevant to the Lignin Pyrolysis. Part III. Kinetics of H-Abstraction by H, OH, and CH 3 Radicals. J Phys Chem A 2020; 124:4905-4915. [PMID: 32432474 DOI: 10.1021/acs.jpca.9b11898] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Lignin is the most complex component of biomass, and development of a detailed chemical kinetic model for biomass pyrolysis mainly relies on the understanding of the lignin decomposition kinetics. para-Coumaryl alcohol (p-CMA, HOPh-CH═CH-CH2OH), the focus of our analysis, is the simplest of the lignin monomers (monolignols) containing a typical side-chain double bond and both alkyl- and phenolic-type OH-groups. In parts I and II of our work (Asatryan, R. J. Phys. Chem. A 2019, 123, 2570-2585; Hudzik, J. M. J. Phys. Chem. A 2020, current issue), we created a detailed potential energy surface (PES) and performed a kinetic analysis of chemically activated, unimolecular, and bimolecular reactions pathways for p-CMA + OH. Reaction pathways analyzed include dissociation, intramolecular abstraction, group transfer, and elimination processes. The α- and β-carbon addition reactions generate 1,3- (RA1) and 1,2-diol (RB1) adduct radicals, respectively. Well depths are approximately 29 and 41 kcal/mol below the p-CMA + OH entrance level. Kinetic analysis aides in determining the major pathways for our conventional and fractional pyrolysis experiments. The current paper focuses on the H-abstraction reactions via H, OH, and CH3 light ("pool") radicals from p-CMA. The thermochemical properties of all stable, radical, and transition-state species were determined using the ωB97XD density functional theory (DFT) and higher-level CBS-QB3 composite methods. Barrier heights from the prereaction complexes, for OH-radical abstractions, to the transition states for the propanoid side chain are compared to the model H-abstraction reactions of allyl alcohol (AA) with OH and p-CMA with H and CH3 radicals. The lowest-energy, most stable, p-CMA radical formed is at the C9 allylic position (p-CMA-C9j) with exothermicity of 26.63, 41.32, and 27.34 kcal/mol for H, OH, and CH3, respectively. For OH-radical abstraction at this position, our findings are consistent with corresponding data on AA + OH at 37.44 kcal/mol and similar to that of RB1. A similar stable radical with an exothermicity of 34.95 kcal/mol occurs for the phenol hydroxyl group, generating the p-CMA-O4j radical. H-abstraction pathways are considered in relation to other major pathways previously considered for p-CMA + OH reactions including H-atom shifts, dehydration, and β-scission reactions. Derived rate coefficients for substituted phenols can be utilized in detailed kinetic models for lignin/biomass pyrolysis.
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Affiliation(s)
- Jason M Hudzik
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey 07102, United States
| | - Joseph W Bozzelli
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey 07102, United States
| | - Rubik Asatryan
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New Jersey 14226, United States
| | - Eli Ruckenstein
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New Jersey 14226, United States
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2
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Hudzik JM, Barekati-Goudarzi M, Khachatryan L, Bozzelli JW, Ruckenstein E, Asatryan R. OH-Initiated Reactions of para-Coumaryl Alcohol Relevant to the Lignin Pyrolysis. Part II. Kinetic Analysis. J Phys Chem A 2020; 124:4875-4904. [DOI: 10.1021/acs.jpca.9b11894] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jason M. Hudzik
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey 07102, United States
| | | | - Lavrent Khachatryan
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Joseph W. Bozzelli
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey 07102, United States
| | - Eli Ruckenstein
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14226, United States
| | - Rubik Asatryan
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14226, United States
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Gleuwitz FR, Sivasankarapillai G, Chen Y, Friedrich C, Laborie MPG. Lignin-Assisted Stabilization of an Oriented Liquid Crystalline Cellulosic Mesophase, Part B: Toward the Molecular Origin and Mechanism. Biomacromolecules 2020; 21:2276-2284. [DOI: 10.1021/acs.biomac.0c00220] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- F. Robert Gleuwitz
- Institute of Earth and Environmental Science, Chair of Forest Biomaterials, University of Freiburg, Freiburg, Germany
- Freiburg Materials Research Centre (FMF), University of Freiburg, Freiburg, Germany
| | - Gopakumar Sivasankarapillai
- Institute of Earth and Environmental Science, Chair of Forest Biomaterials, University of Freiburg, Freiburg, Germany
- Freiburg Materials Research Centre (FMF), University of Freiburg, Freiburg, Germany
| | - Yian Chen
- Institute of Earth and Environmental Science, Chair of Forest Biomaterials, University of Freiburg, Freiburg, Germany
| | - Christian Friedrich
- Freiburg Materials Research Centre (FMF), University of Freiburg, Freiburg, Germany
- Institute for Macromolecular Chemistry, University of Freiburg, Freiburg, Germany
| | - Marie-Pierre G. Laborie
- Institute of Earth and Environmental Science, Chair of Forest Biomaterials, University of Freiburg, Freiburg, Germany
- Freiburg Materials Research Centre (FMF), University of Freiburg, Freiburg, Germany
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Asatryan R, Hudzik JM, Bozzelli JW, Khachatryan L, Ruckenstein E. OH-Initiated Reactions of p-Coumaryl Alcohol Relevant to the Lignin Pyrolysis. Part I. Potential Energy Surface Analysis. J Phys Chem A 2019; 123:2570-2585. [DOI: 10.1021/acs.jpca.9b00185] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Rubik Asatryan
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14226, United States
| | - Jason M. Hudzik
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey 07102, United States
| | - Joseph W. Bozzelli
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey 07102, United States
| | - Lavrent Khachatryan
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803, United States
| | - Eli Ruckenstein
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14226, United States
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5
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Mishra PK, Ekielski A. The Self-Assembly of Lignin and Its Application in Nanoparticle Synthesis: A Short Review. NANOMATERIALS (BASEL, SWITZERLAND) 2019; 9:E243. [PMID: 30754724 PMCID: PMC6410071 DOI: 10.3390/nano9020243] [Citation(s) in RCA: 72] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 02/03/2019] [Accepted: 02/04/2019] [Indexed: 01/16/2023]
Abstract
Lignin serves as a significant contributor to the natural stock of non-fossilized carbon, second only to cellulose in the biosphere. In this review article, we focus on the self-assembly properties of lignin and their contribution to its effective utilization and valorization. Traditionally, investigations on self-assembly properties of lignin have aimed at understanding the lignification process of the cell wall and using it for efficient delignification for commercial purposes. In recent years (mainly the last three years), an increased number of attempts and reports of technical-lignin nanostructure synthesis with controlled particle size and morphology have been published. This has renewed the interests in the self-assembly properties of technical lignins and their possible applications. Based on the sources and processing methods of lignin, there are significant differences between its structure and properties, which is the primary obstacle in the generalized understanding of the lignin structure and the lignification process occurring within cell walls. The reported studies are also specific to source and processing methods. This work has been divided into two parts. In the first part, the aggregation propensity of lignin based on type, source and extraction method, temperature, and pH of solution is discussed. This is followed by a critical overview of non-covalent interactions and their contribution to the self-associative properties of lignin. The role of self-assembly towards the understanding of xylogenesis and nanoparticle synthesis is also discussed. A particular emphasis is placed on the interaction and forces involved that are used to explain the self-association of lignin.
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Affiliation(s)
- Pawan Kumar Mishra
- Department of Wood Processing Technology, Mendel University in Brno, 61300 Brno, Czech Republic.
| | - Adam Ekielski
- Department of Production Management and Engineering, Warsaw University Of Life Sciences, 02-787 Warsaw, Poland.
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6
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Kulik HJ. MODELING MECHANOCHEMISTRY FROM FIRST PRINCIPLES. REVIEWS IN COMPUTATIONAL CHEMISTRY 2018. [DOI: 10.1002/9781119518068.ch6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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7
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Mar BD, Kulik HJ. Depolymerization Pathways for Branching Lignin Spirodienone Units Revealed with ab Initio Steered Molecular Dynamics. J Phys Chem A 2017; 121:532-543. [PMID: 28005362 DOI: 10.1021/acs.jpca.6b11414] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Lignocellulosic biomass is an abundant, rich source of aromatic compounds, but direct utilization of raw lignin has been hampered by both the high heterogeneity and variability of linking bonds in this biopolymer. Ab initio steered molecular dynamics (AISMD) has emerged both as a fruitful direct computational screening approach to identify products that occur through mechanical depolymerization (i.e., in sonication or ball-milling) and as a sampling approach. By varying the direction of force and sampling over 750 AISMD trajectories, we identify numerous possible pathways through which lignin depolymerization may occur in pyrolysis or through catalytic depolymerization as well. Here, we present eight unique major depolymerization pathways discovered via AISMD for the recently characterized spirodienone lignin branching linkage that may comprise around 10% weight of all lignin in some softwoods. We extract representative trajectories from AISMD and carry out reaction pathway analysis to identify energetically favorable pathways for lignin depolymerization. Importantly, we identify dynamical effects that could not be observed through more traditional calculations of bond dissociation energies. Such effects include thermodynamically favorable recovery of aromaticity in the dienone ring that leads to near-barrierless subsequent ether cleavage and hydrogen-bonding effects that stabilize newly formed radicals. Some of the most stable spirodienone fragments that reside at most 1 eV above the reactant structure are formed with only 2 eV barriers for C-C bond cleavage, suggesting key targets for catalyst design to drive targeted depolymerization of lignin.
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Affiliation(s)
- Brendan D Mar
- Department of Chemical Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
| | - Heather J Kulik
- Department of Chemical Engineering, Massachusetts Institute of Technology , Cambridge, Massachusetts 02139, United States
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8
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Valencia PJS, Merchancano STP, Paredes H, Marinez LEB. Molecular catchers for pharmacologically active substances in wastewaters, a theoretical study. ACTA ACUST UNITED AC 2016. [DOI: 10.1088/1742-6596/743/1/012011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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9
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Mar BD, Qi HW, Liu F, Kulik HJ. Ab Initio Screening Approach for the Discovery of Lignin Polymer Breaking Pathways. J Phys Chem A 2015; 119:6551-62. [PMID: 26001164 DOI: 10.1021/acs.jpca.5b03503] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The directed depolymerization of lignin biopolymers is of utmost relevance for the valorization or commercialization of biomass fuels. We present a computational and theoretical screening approach to identify potential cleavage pathways and resulting fragments that are formed during depolymerization of lignin oligomers containing two to six monomers. We have developed a chemical discovery technique to identify the chemically relevant putative fragments in eight known polymeric linkage types of lignin. Obtaining these structures is a crucial precursor to the development of any further kinetic modeling. We have developed this approach by adapting steered molecular dynamics calculations under constant force and varying the points of applied force in the molecule to diversify the screening approach. Key observations include relationships between abundance and breaking frequency, the relative diversity of potential pathways for a given linkage, and the observation that readily cleaved bonds can destabilize adjacent bonds, causing subsequent automatic cleavage.
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Affiliation(s)
| | | | - Fang Liu
- §Department of Chemistry, Stanford University, Stanford, California 94305, United States
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10
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Conformational analysis of lignin models: a chemometric approach. J Mol Model 2012; 19:2149-63. [DOI: 10.1007/s00894-012-1689-4] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2012] [Accepted: 11/12/2012] [Indexed: 10/27/2022]
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11
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Charlier L, Mazeau K. Molecular Modeling of the Structural and Dynamical Properties of Secondary Plant Cell Walls: Influence of Lignin Chemistry. J Phys Chem B 2012; 116:4163-74. [DOI: 10.1021/jp300395k] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Landry Charlier
- Centre de Recherches sur les Macromolécules Végétales (CERMAV-CNRS) (affiliated with
the Université Joseph Fourier and member of the Institut de
Chimie Moléculaire de Grenoble), BP 53, F-38041 Grenoble cedex
9, France
| | - Karim Mazeau
- Centre de Recherches sur les Macromolécules Végétales (CERMAV-CNRS) (affiliated with
the Université Joseph Fourier and member of the Institut de
Chimie Moléculaire de Grenoble), BP 53, F-38041 Grenoble cedex
9, France
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12
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Younker JM, Beste A, Buchanan AC. Computational Study of Bond Dissociation Enthalpies for Substituted β-O-4 Lignin Model Compounds. Chemphyschem 2011; 12:3556-65. [DOI: 10.1002/cphc.201100477] [Citation(s) in RCA: 79] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2011] [Revised: 08/18/2011] [Indexed: 11/09/2022]
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13
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Watts HD, Mohamed MNA, Kubicki JD. Comparison of Multistandard and TMS-Standard Calculated NMR Shifts for Coniferyl Alcohol and Application of the Multistandard Method to Lignin Dimers. J Phys Chem B 2011; 115:1958-70. [DOI: 10.1021/jp110330q] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Heath D. Watts
- Department of Geosciences and the Earth and Environmental Systems Institute and ‡Center for NanoCellulosics, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Mohamed Naseer Ali Mohamed
- Department of Geosciences and the Earth and Environmental Systems Institute and ‡Center for NanoCellulosics, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - James D. Kubicki
- Department of Geosciences and the Earth and Environmental Systems Institute and ‡Center for NanoCellulosics, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
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14
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Ramalingam S, Periandy S. Spectroscopic investigation, computed IR intensity, Raman activity and vibrational frequency analysis on 3-bromoanisole using HF and DFT (LSDA/MPW1PW91) calculations. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 78:835-843. [PMID: 21216183 DOI: 10.1016/j.saa.2010.12.043] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2010] [Revised: 12/08/2010] [Accepted: 12/10/2010] [Indexed: 05/30/2023]
Abstract
In this work, the experimental and theoretical spectra of 3-bromoanisole (3-BA) are studied. FT-IR and FT-Raman spectra of title molecule in the liquid phase have been recorded in the region 4000-100 cm(-1). The structural and spectroscopic data of the molecule in the ground state have been calculated by using Hartree-Fock and density functional method (LSDA and MPW1PW91) with the 6-31G (d, p) and 6-311G (d, p) basis sets. The vibrational frequencies are calculated and scaled values have been compared with the experimental FT-IR and FT-Raman spectra. The observed and calculated frequencies are found in good agreement. The DFT-LSDA/6-311G (d, p) calculations have been found are more reliable than the ab initio HF/6-31G (d, p) calculations for the vibrational study of 3-BA. The optimized geometric parameters (bond lengths and bond angles) are compared with experimental values of the molecule. The alteration of vibrational bands due to the substitutions in the base molecule is also investigated from their characteristic region of linked spectrum.
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15
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Watts HD, Mohamed MNA, Kubicki JD. Evaluation of potential reaction mechanisms leading to the formation of coniferyl alcohol α-linkages in lignin: a density functional theory study. Phys Chem Chem Phys 2011; 13:20974-85. [DOI: 10.1039/c1cp21906e] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Beste A, Buchanan AC, Harrison RJ. Computational Prediction of α/β Selectivities in the Pyrolysis of Oxygen-Substituted Phenethyl Phenyl Ethers. J Phys Chem A 2008; 112:4982-8. [DOI: 10.1021/jp800767j] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Ariana Beste
- Computer Science and Mathematics Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, Tennessee 37831-6367, Chemical Sciences Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, Tennessee 37831-6197, and Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996
| | - A. C Buchanan
- Computer Science and Mathematics Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, Tennessee 37831-6367, Chemical Sciences Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, Tennessee 37831-6197, and Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996
| | - Robert J. Harrison
- Computer Science and Mathematics Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, Tennessee 37831-6367, Chemical Sciences Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, Tennessee 37831-6197, and Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996
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17
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Nagy PI, Erhardt PW. Ab Initio Study of Hydrogen-Bond Formation between Cyclic Ethers and Selected Amino Acid Side Chains. J Phys Chem A 2006; 110:13923-32. [PMID: 17181352 DOI: 10.1021/jp061113t] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Binding energies for hydrogen-bonded complexes of six cyclic ethers with five hydrogen-bond donor molecules that mimic selected amino acid side chains have been calculated at the MP2/6-31G*, MP2/6-31+G*, MP2/6-311++G**(single point), and MP2/aug-cc-pvtz levels, using geometries obtained with or without counterpoise corrections throughout the geometry optimization. The calculated basis set superposition error (BSSE) amounts to 10-20% and 5-10% of the uncorrected binding energies for the neutral and ionic species, respectively, at the MP2/aug-cc-pvtz level. The authors conclude that the O...H distances in the hydrogen bonds and binding energies for the studied systems may be determined with uncertainties of up to 0.08 A and 1-2 kcal/mol, respectively, in comparison with the MP2/aug-cc-pvtz values at a reasonable computational cost by performing standard geometry optimization at the MP2/6-31+G* level. Hydrogen-bond formation energies are more negative for cyclic ethers compared to their counterparts with a C=C double bond in the ring next to the oxygen atom. The less negative hydrogen-bonding energy and the increased O...H separation have been attributed to the reduced basicity of the ether oxygen when the lone pairs can enter conjugation with the pi-electrons of the Calpha=Cbeta double bond. The present study is the first step toward the development of an affordable computational level for estimating the binding energies of natural product, fused ring ether systems to the human estrogen receptor.
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Affiliation(s)
- Peter I Nagy
- Center for Drug Design and Development, College of Pharmacy, The University of Toledo, Toledo, OH 43606-3390, USA.
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18
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Besombes S, Mazeau K. Molecular dynamics simulations of a guaiacyl beta-O-4 lignin model compound: examination of intramolecular hydrogen bonding and conformational flexibility. Biopolymers 2004; 73:301-15. [PMID: 14755566 DOI: 10.1002/bip.10587] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
The dynamical conformational behavior of a guaiacyl beta-O-4 lignin model compound has been investigated by molecular simulations. The potential energy surface of the molecule in vacuum has been examined by means of an adiabatic map, showing a large accessible conformational space with multiple energy minima separated by low barriers. Molecular dynamics simulations have been performed in vacuum and with explicit solvent molecules for 10 and 2.1 ns, respectively. Molecular dynamics trajectories recorded in vacuum have shown the molecule to be flexible and to visit a large number of conformations. Many intramolecular H-bonds have been observed, existing for more than 90% of the total simulation time. The presence of explicit solvent molecules induces a significant broadening of some regions of the accessible conformational space and also largely reduces the statistical significance of intramolecular H-bonding. Intramolecular H-bonds observed in vacuum do not persist significantly and are preferentially exchanged with intermolecular H-bonds to the surrounding solvent molecules. The theoretical results are in good agreement with experimental NMR data that do not support the existence of strong and persistent intramolecular H-bonds in solution but instead indicate that H-bonds to solvent predominate. Finally, both molecular modeling and NMR approaches predict the guaiacyl beta-O-4 structure to be flexible and indicate that intramolecular H-bonds are not strong and persistent enough to confer rigidity to the molecule in solution.
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Affiliation(s)
- Stéphane Besombes
- Centre de Recherches sur les Macromolécules Végétales, CERMAV-CNRS (associated with University Joseph Fourier), BP 53, 38041 Grenoble Cedex 9, France
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19
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Lignin Biosynthesis and Degradation — a Major Challenge for Computational Chemistry. ACTA ACUST UNITED AC 2003. [DOI: 10.1007/3-540-36569-9_10] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/14/2023]
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Bossa M, Morpurgo S, Stranges S. The use of ab initio and DFT calculations in the interpretation of ultraviolet photoelectron spectra: the rotational isomerism of anisole and thioanisole as a case study. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s0166-1280(02)00469-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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21
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Roblin JP, Duran H, Duran E, Gorrichon L, Donnadieu B. X-ray Structure of a Trimeric 5,5′-Biaryl/erythro-
β-O-4-ether Lignin Model: Evidence for Through-Space Weak Interactions. Chemistry 2000. [DOI: 10.1002/(sici)1521-3765(20000403)6:7<1229::aid-chem1229>3.0.co;2-o] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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22
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Tsuzuki S, Houjou H, Nagawa Y, Hiratani K. High-Level ab Initio Calculations of Torsional Potential of Phenol, Anisole, and o-Hydroxyanisole: Effects of Intramolecular Hydrogen Bond. J Phys Chem A 2000. [DOI: 10.1021/jp993607e] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Seiji Tsuzuki
- National Institute of Materials and Chemical Research, Tsukuba, Ibaraki 305-8565, Japan, and National Institute for Advanced Interdisciplinary Research, Tsukuba, Ibaraki 305-8562, Japan
| | - Hirohiko Houjou
- National Institute of Materials and Chemical Research, Tsukuba, Ibaraki 305-8565, Japan, and National Institute for Advanced Interdisciplinary Research, Tsukuba, Ibaraki 305-8562, Japan
| | - Yoshinobu Nagawa
- National Institute of Materials and Chemical Research, Tsukuba, Ibaraki 305-8565, Japan, and National Institute for Advanced Interdisciplinary Research, Tsukuba, Ibaraki 305-8562, Japan
| | - Kazuhisa Hiratani
- National Institute of Materials and Chemical Research, Tsukuba, Ibaraki 305-8565, Japan, and National Institute for Advanced Interdisciplinary Research, Tsukuba, Ibaraki 305-8562, Japan
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