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Mó O, Montero-Campillo MM, Yáñez M, Alkorta I, Elguero J. Discovering trends in the Lewis acidity of beryllium and magnesium hydrides and fluorides with increasing clusters size. J Comput Chem 2024; 45:1702-1715. [PMID: 38567760 DOI: 10.1002/jcc.27356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Revised: 03/13/2024] [Accepted: 03/18/2024] [Indexed: 06/13/2024]
Abstract
We have reported in the last years the strong effect that Be- and Mg-containing Lewis acids have on the intrinsic properties of typical bases, which become acids upon complexation. In an effort to investigate these changes when the Be and Mg derivatives form clusters of increasing size, we have examined the behavior of the (MX2)n (M = Be, Mg; X = H, F; n = 1, 2, 3) clusters when they interact with ammonia, methanimine, hydrogen cyanide and pyridine, and with their corresponding deprotonated forms. The complexes obtained at the M06-2X/aug-cc-pVTZ level were analyzed using the MBIE energy decomposition formalism, in parallel with QTAIM, ELF, NCIPLOT and AdNDP analyses of their electron density. For n = 1 the interaction enthalpy for the different families of monomers, Be (Mg) hydrides and Be (Mg) fluorides, follows the same trend as the intrinsic basicity of the base that interacts with them. This interaction is greatly reinforced after the deprotonation of the base, resulting in a significant enhancement of the intrinsic acidity of the corresponding MX2-Base complex. For (MX2)2 clusters a further reinforcement of the interaction with the base is observed, this reinforcement being again larger for the deprotonated complexes. However, the concomitant increase of their intrinsic acidity is one order of magnitude larger for hydrides than for fluorides. Unexpectedly, the cyclic conformers (MX2)3, which are more unstable than the linear ones, become the global minima after association with the base and the same is true for the deprotonated complex. Accordingly, a further increase of the intrinsic acidity of the (MX2)3-Base complexes with respect to the (MX2)2-Base ones is observed. This effect is maximum for (MgF2)3 clusters, to the point that the (MgF2)3-Base complexes become more acidic than nitric acid, the extreme case being the cluster (MgF2)3-NCH, whose acidity is higher than that of perchloric acid.
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Affiliation(s)
- Otilia Mó
- Departamento de Química, Módulo 13, Facultad de Ciencias, and Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Madrid, Spain
| | - M Merced Montero-Campillo
- Departamento de Química, Módulo 13, Facultad de Ciencias, and Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Madrid, Spain
| | - Manuel Yáñez
- Departamento de Química, Módulo 13, Facultad de Ciencias, and Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Madrid, Spain
| | - Ibon Alkorta
- Instituto de Química Médica, IQM-CSIC, Madrid, Spain
| | - José Elguero
- Instituto de Química Médica, IQM-CSIC, Madrid, Spain
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2
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Montero-Campillo MM, Mó O, Alkorta I, Elguero J, Yáñez M. Disrupting bonding in azoles through beryllium bonds: Unexpected coordination patterns and acidity enhancement. J Chem Phys 2022; 156:194303. [PMID: 35597641 DOI: 10.1063/5.0089716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Although triazoles and tetrazole are amphoteric and may behave as weak acids, the latter property can be hugely enhanced by beryllium bonds. To explain this phenomenon, the structure and bonding characteristics of the complexes between triazoles and tetrazoles with one and two molecules of BeF2 have been investigated through the use of high-level G4 ab initio calculations. The formation of the complexes between the N basic sites of the azoles and the Be center of the BeF2 molecule and the (BeF2)2 dimer leads to a significant bonding perturbation of both interacting subunits. The main consequence of these electron density rearrangements is the above-mentioned increase in the intrinsic acidity of the azole subunit, evolving from a typical nitrogen base to a very strong nitrogenous acid. This effect is particularly dramatic when the interaction involves the (BeF2)2 dimer, that is, a Lewis acid much stronger than the monomer. Although the azoles investigated have neighboring N-basic sites, their interaction with the (BeF2)2 dimer yields a monodentate complex. However, the deprotonated species becomes extra-stabilized because a second N-Be bond is formed, leading to a new five-membered ring, with the result that the azole-(BeF2)2 complexes investigated become stronger nitrogenous acids than oxyacids such as perchloric acid.
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Affiliation(s)
- M Merced Montero-Campillo
- Departamento de Química, Módulo 13, Facultad de Ciencias and Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Madrid 28049, Spain
| | - Otilia Mó
- Departamento de Química, Módulo 13, Facultad de Ciencias and Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Madrid 28049, Spain
| | - Ibon Alkorta
- Instituto de Química Médica (CSIC), Juan de la Cierva, 3, E-28006 Madrid, Spain
| | - José Elguero
- Instituto de Química Médica (CSIC), Juan de la Cierva, 3, E-28006 Madrid, Spain
| | - Manuel Yáñez
- Departamento de Química, Módulo 13, Facultad de Ciencias and Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Madrid 28049, Spain
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Raubenheimer HG, Mapolie SF. Acid and base strength variations: rationalization for cyclic amine bases and acidic aqua cations. Dalton Trans 2021; 50:17864-17878. [PMID: 34792051 DOI: 10.1039/d1dt02940a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This perspective highlights and evaluates recent key developments in the thermodynamic approach used to analyze trends in acid and base strength variation. According to this approach, acid and base strength ranking can be interpreted by using thermodynamic or thermochemical cycles. Each cycle generally consists of three independent but well-defined steps. The modus operandi described here entails the identification of the dominant step and the rationalization of its free energy/enthalpy/energy change along a selected series in terms of known structural chemical concepts. Developments in this approach are described by focusing on two related series of bases and two series of acids. In the case of the former the protonation of a series of N-heterocyclic amine bases together with their methyl-substituted analogs receives particular attention while in the case of acids, the acidic properties of aqua dications of elements in period 4 and group 2 are probed. It is illustrated how significant progress in computational chemistry and mass spectrometric techniques can be employed to compare 'inherent' basicity or acidity in the selected families of compounds by using simple gas-phase energy cycles. Unique, dual functions for both electronegativity (element and orbital) and charge density (for aqua cations) indicators are identified and used to evaluate these cycles. Solvent effects (in aqueous solution) are accommodated by including dehydration and hydration changes in appropriately-extended, three-step free energy cycles. It is further suggested that the dominant step in the extended thermodynamic cycle for monomeric aqua cations is the transfer of M(H2O)n2+ complex hydrates from the gas-phase to bulk water. Charge density of the aqua cations again features prominently in proposed rationalizations. Finally, this article also sheds light on salient relationships that exist between empirically and quantum-chemically estimated enthalpy and entropy changes for the aforementioned transfer process.
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Affiliation(s)
- Helgard G Raubenheimer
- Department of Chemistry and Polymer Science, University of Stellenbosch, 7602, Matieland, South Africa.
| | - Selwyn F Mapolie
- Department of Chemistry and Polymer Science, University of Stellenbosch, 7602, Matieland, South Africa.
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Mó O, Montero-Campillo MM, Yáñez M, Alkorta I, Elguero J. Are Anions of Cyclobutane Beryllium Derivatives Stabilized through Four-Center One-Electron Bonds? J Phys Chem A 2020; 124:1515-1521. [PMID: 31962049 DOI: 10.1021/acs.jpca.9b10187] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
High-level G4 ab initio calculations allowed us to show that C4H4(BeX)4 (X = H, Cl) derivatives behave as rather efficient electron capturers due to their ability to trap the extra electron through the formation of a four-membered beryllium ring. This finding is in agreement with previous work showing the ability of highly electron-deficient atoms, such as beryllium, to lead to multicenter one-electron bonds. In our particular case, the formation of the four-center bond is characterized, in very good harmony, by different topological methods such as quantum theory of atoms in molecules (QTAIM), the electron localization function (ELF), and the noncovalent interactions (NCI) approach and is accompanied by large electron affinity values, around 300 kJ·mol-1, in the gas phase. Preliminary results may anticipate that the ability of groups of beryllium atoms to trap electrons decays on going to bigger systems.
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Affiliation(s)
- Otilia Mó
- Departamento de Química, Facultad de Ciencias, Módulo 13, and Institute of Advanced Chemical Sciences (IadChem) , Universidad Autónoma de Madrid , Campus de Excelencia UAM-CSIC, Cantoblanco, E-28049 Madrid , Spain
| | - M Merced Montero-Campillo
- Departamento de Química, Facultad de Ciencias, Módulo 13, and Institute of Advanced Chemical Sciences (IadChem) , Universidad Autónoma de Madrid , Campus de Excelencia UAM-CSIC, Cantoblanco, E-28049 Madrid , Spain
| | - Manuel Yáñez
- Departamento de Química, Facultad de Ciencias, Módulo 13, and Institute of Advanced Chemical Sciences (IadChem) , Universidad Autónoma de Madrid , Campus de Excelencia UAM-CSIC, Cantoblanco, E-28049 Madrid , Spain
| | - Ibon Alkorta
- Instituto de Química Médica (CSIC) , Juan de la Cierva, 3 , E-28006 Madrid , Spain
| | - José Elguero
- Instituto de Química Médica (CSIC) , Juan de la Cierva, 3 , E-28006 Madrid , Spain
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5
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Gope K, Mason N, Krishnakumar E, Prabhudesai VS. DEA dynamics of chlorine dioxide probed by velocity slice imaging. Phys Chem Chem Phys 2019; 21:14023-14032. [PMID: 30640334 DOI: 10.1039/c8cp06660d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report, for the first time, the detailed dynamics of dissociative electron attachment to the atmospherically important chlorine dioxide (OClO) molecule exploring all the product anion channels. Below 2 eV, the production of vibrationally excited OCl- dominates the DEA process whereas at electron energies greater than 2 eV, three-body dissociation is found to result in O- and Cl- production. We find that the internal energy of OCl- and the kinetic energy of Cl- are large enough for them to be relevant in the ozone-depleting catalytic cycle and more investigations on the reaction of these anions with ozone are necessary to completely understand the role of DEA to OClO in ozone depletion. These results also point to an urgent need for comprehensive theoretical calculations of the DEA process to this atmospherically important molecule.
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Affiliation(s)
- Krishnendu Gope
- Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, 400005 Mumbai, India.
| | - Nigel Mason
- School of Physical Sciences, University of Kent, Canterbury, CT2 7NH, UK
| | - E Krishnakumar
- Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, 400005 Mumbai, India.
| | - Vaibhav S Prabhudesai
- Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, 400005 Mumbai, India.
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Basis Set Effects in the Description of the Cl-O Bond in ClO and XClO/ClOX Isomers (X = H, O, and Cl) Using DFT and CCSD(T) Methods. J CHEM-NY 2019. [DOI: 10.1155/2019/4057848] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The performance of a group of density functional methods of progressive complexity for the description of the ClO bond in a series of chlorine oxides was investigated. The simplest ClO radical species and the two isomeric structures XClO/ClOX for each X = H, Cl, and O were studied using the PW91, TPSS, B3LYP, PBE0, M06, M06-2X, BMK, and B2PLYP functionals. Geometry optimizations and reaction enthalpies and enthalpies of formation for each species were calculated using Pople basis sets and the (aug)-cc-pVnZ Dunning sets, with n = D, T, Q, 5, and 6. For the calculation of enthalpies of formation, atomization and isodesmic reactions were employed. Both the precision of the methods with respect to the increase of the basis sets, as well as their accuracy, were gauged by comparing the results with the more accurate CCSD(T) calculations, performed using the same basis sets as for the DFT methods. The results obtained employing composite chemical methods (G4, CBS-QB3, and W1BD) were also used for the comparisons, as well as the experimental results when they are available. The results obtained show that error compensation is the key for successful description of molecular properties (geometries and energies) by carefully selecting the method and basis sets. In general, expansion of the one-electron basis set to the limit of completeness does not improve results at the DFT level, but just the opposite. The enthalpies of formation calculated at the CCSD(T)/aug-cc-pV6Z for the species considered are generally in agreement with experimental determinations and the most accurate theoretical values. Different sources of error in the calculations are discussed in detail.
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7
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Valadbeigi Y, Kurtén T. Clustering of HClO 4 with Brønsted (H 2SO 4, HClO 4, HNO 3) and Lewis acids BX 3 (X = H, F, Cl, Br, OH): a DFT study. NEW J CHEM 2019. [DOI: 10.1039/c9nj04694a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Interaction of HClO4 with Lewis and Brønsted acids leads to a variety of clusters exhibiting a wide range of acidity.
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Affiliation(s)
- Younes Valadbeigi
- Department of Chemistry
- Faculty of Science
- Imam Khomeini International University
- Qazvin
- Iran
| | - Theo Kurtén
- Department of Chemistry
- University of Helsinki
- P.O. Box 55
- FI-00014 Helsinki
- Finland
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8
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Reina M, Martínez A. A new free radical scavenging cascade involving melatonin and three of its metabolites (3OHM, AFMK and AMK). COMPUT THEOR CHEM 2018. [DOI: 10.1016/j.comptc.2017.11.017] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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9
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10
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Guan XH, Wang D, Wang Q, Chi MS, Liu CG. Estimation of various chemical bond dissociation enthalpies of large-sized kerogen molecules using DFT methods. Mol Phys 2016. [DOI: 10.1080/00268976.2016.1143983] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Xiao-Hui Guan
- College of Chemical Engineering, Northeast Dianli University, Jilin, Jilin Province, P. R. China
| | - Di Wang
- College of Chemical Engineering, Northeast Dianli University, Jilin, Jilin Province, P. R. China
| | - Qing Wang
- College of Chemical Engineering, Northeast Dianli University, Jilin, Jilin Province, P. R. China
| | - Ming-Shu Chi
- College of Chemical Engineering, Northeast Dianli University, Jilin, Jilin Province, P. R. China
| | - Chun-Guang Liu
- College of Chemical Engineering, Northeast Dianli University, Jilin, Jilin Province, P. R. China
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11
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Reina M, Martínez A. Is Silybin the Best Free Radical Scavenger Compound in Silymarin? J Phys Chem B 2016; 120:4568-78. [PMID: 27149000 DOI: 10.1021/acs.jpcb.6b02807] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Silymarin is a natural mixture with beneficial properties for health, specifically due to its antiradical characteristics. The major components of this mixture are silybin (SIL), silychristin (SILYC), isosilybin (ISOSIL), silydianin (SILYD), and taxifolin (TAX). In this report, the electronic properties of these substances are investigated using density functional theory calculations, mainly in order to fully understand the free radical scavenger properties of these compounds. Optimized geometries and Raman spectra are reported. These results could be experimentally useful for identifying some of the major components of the mixture. The relative abundance of deprotonated species under physiological conditions is also included. The free radical scavenger capacity is studied in relation to three mechanisms: the single electron transfer (SET), the radical adduct formation (RAF), and the hydrogen atom transfer (HAT). According to this investigation, the HAT mechanism is the most efficient mechanism for scavenging free radicals for these compounds followed by the RAF mechanism where intramolecular hydrogen bonds are formed in order to stabilize the (•)OOH free radical. A particularly important factor is that none of the compounds being studied showed an outstanding antiradical capacity performance compared to the others. In this sense, silymarin is an interesting mixture with antiradical properties and we now know that one single component should be as effective as the mixture.
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Affiliation(s)
- Miguel Reina
- Departamento de Materiales de Baja Dimensionalidad Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México , Circuito Exterior s/n, CU, P.O. Box 70-360, Coyoacán, 04510 Ciudad de México, México
| | - Ana Martínez
- Departamento de Materiales de Baja Dimensionalidad Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México , Circuito Exterior s/n, CU, P.O. Box 70-360, Coyoacán, 04510 Ciudad de México, México
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12
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Trummal A, Lipping L, Kaljurand I, Koppel IA, Leito I. Acidity of Strong Acids in Water and Dimethyl Sulfoxide. J Phys Chem A 2016; 120:3663-9. [DOI: 10.1021/acs.jpca.6b02253] [Citation(s) in RCA: 105] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Aleksander Trummal
- National Institute of Chemical Physics and Biophysics, 23 Akadeemia tee, Tallinn 12618, Estonia
| | - Lauri Lipping
- Institute
of Chemistry, University of Tartu, 14a Ravila Street, Tartu 50411, Estonia
| | - Ivari Kaljurand
- Institute
of Chemistry, University of Tartu, 14a Ravila Street, Tartu 50411, Estonia
| | - Ilmar A. Koppel
- Institute
of Chemistry, University of Tartu, 14a Ravila Street, Tartu 50411, Estonia
| | - Ivo Leito
- Institute
of Chemistry, University of Tartu, 14a Ravila Street, Tartu 50411, Estonia
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13
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Reina M, Martínez A. Silybin and 2,3-Dehydrosilybin Flavonolignans as Free Radical Scavengers. J Phys Chem B 2015; 119:11597-606. [PMID: 26259041 DOI: 10.1021/acs.jpcb.5b06448] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The electronic properties of six derivatives of silybin (characterized by the absence of the 2,3 double bond) and six derivatives of 2,3-dehydrosilybin (characterized by the presence of the 2,3 double bond) have been studied by applying density functional theory to fully understand the free radical scavenger's mechanism for action and the relationship between reactivity and chemical structure. Optimized geometries, Raman spectra, and λmax values are reported, enabling us to characterize the systems. These spectra may be useful for monitoring the oxidation between silybin and 2,3-dehydrosilybin, thus providing important experimental information. The relative abundance of deprotonated species under physiological conditions is also reported. Under physiological conditions (pH 7.4), ∼70% of silybin is protonated, but 60% of 2,3-dehydrosilybin is deprotonated. The free radical scavenger capacity is analyzed in terms of two mechanisms: electron transfer and adduct formation. Deprotonated molecules are better electron donors and worse electron acceptors than non-deprotonated species. The conclusions derived from this investigation completely concur with previous experimental results. The free radical scavenging activity of 2,3-dehydrosilybin derivatives is higher than that for silybin derivatives. What was not previously considered was the importance of the deprotonated species, which is remarkable and may be important for future experiments.
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Affiliation(s)
- Miguel Reina
- Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México , Circuito Exterior SN, Ciudad Universitaria, CP 04510 Coyoacán, México DF, México
| | - Ana Martínez
- Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México , Circuito Exterior SN, Ciudad Universitaria, CP 04510 Coyoacán, México DF, México
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14
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Kögel JF, Linder T, Schröder FG, Sundermeyer J, Goll SK, Himmel D, Krossing I, Kütt K, Saame J, Leito I. Fluoro- and Perfluoralkylsulfonylpentafluoroanilides: Synthesis and Characterization of NH Acids for Weakly Coordinating Anions and Their Gas-Phase and Solution Acidities. Chemistry 2015; 21:5769-82. [DOI: 10.1002/chem.201405391] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Indexed: 11/07/2022]
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15
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Carlin C, Gordon MS. Ab initiocalculation of anion proton affinity and ionization potential for energetic ionic liquids. J Comput Chem 2015; 36:597-600. [DOI: 10.1002/jcc.23838] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2014] [Revised: 12/02/2014] [Accepted: 12/21/2014] [Indexed: 11/09/2022]
Affiliation(s)
- Caleb Carlin
- Department of Chemistry and Ames Laboratory; Iowa State University; Ames Iowa 50011 United States
| | - Mark S. Gordon
- Department of Chemistry and Ames Laboratory; Iowa State University; Ames Iowa 50011 United States
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16
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Leigh JK, Rajput J, Richardson DE. Kinetics and Mechanism of Styrene Epoxidation by Chlorite: Role of Chlorine Dioxide. Inorg Chem 2014; 53:6715-27. [DOI: 10.1021/ic500512e] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Jessica K. Leigh
- Center
for Catalysis, Department of
Chemistry, University of Florida, Gainesville, Florida 32611, United States
| | - Jonathan Rajput
- Center
for Catalysis, Department of
Chemistry, University of Florida, Gainesville, Florida 32611, United States
| | - David E. Richardson
- Center
for Catalysis, Department of
Chemistry, University of Florida, Gainesville, Florida 32611, United States
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17
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Liu X, Tabet JC, Cole RB. Evidence for ion-ion interactions between peptides and anions (HSO₄⁻ or ClO₄⁻) derived from high-acidity acids. JOURNAL OF MASS SPECTROMETRY : JMS 2014; 49:490-497. [PMID: 24913401 DOI: 10.1002/jms.3364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2013] [Revised: 03/08/2014] [Accepted: 03/12/2014] [Indexed: 06/03/2023]
Abstract
The existence of gas-phase electrostatic ion-ion interactions between protonated sites on peptides ([Glu] Fibrinopeptide B, Angiotensin I and [Asn(1), Val(5)]-Angiotensin II) and attaching anions (ClO4(-) and HSO4(-)) derived from strong inorganic acids has been confirmed by CID MS/MS. Evidence for ion-ion interactions comes especially from the product ions formed during the first dissociation step, where, in addition to the expected loss of the anion or neutral acid, other product ions are also observed that require covalent bond cleavage (i.e. H2O loss when several carboxylate groups are present, or NH3 loss when only one carboxylate group is present). For [[Glu] Fibrinopeptide B + HSO4](-), under CID, H2O water loss was found to require less energy than H2SO4 departure. This indicates that the interaction between HSO4(-) and the peptide is stronger than the covalent bond holding the hydroxyl group, and must be an ion-ion interaction. The strength and stability of this type of ion-pairing interaction are highly dependent on the accessibility of additional mobile charges to the site. Positive mobile charges such as protons from the peptide can be transferred to the attaching anion to possibly form a neutral that may depart from the complex. Alternatively, an ion-ion interaction can be disrupted by a competing proximal additional negatively charged site of the peptide that can potentially form a salt bridge with the positively charged site and thereby facilitate the attaching anion's departure.
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Affiliation(s)
- Xiaohua Liu
- Department of Chemistry, University of New Orleans, 2000 Lakeshore Dr., New Orleans, LA, 70148, USA
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18
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Wiberg KB, Petersson GA. A Computational Study of RXHn X–H Bond Dissociation Enthalpies. J Phys Chem A 2014; 118:2353-9. [DOI: 10.1021/jp500035m] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kenneth B. Wiberg
- Department
of Chemistry Yale University, New Haven Connecticut 06520, United States
| | - George A. Petersson
- Department
of Chemistry, Wesleyan University, Middletown, Connecticut 06459, United States
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19
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Xue XS, Yang C, Li X, Cheng JP. Computational Study on the pKa Shifts in Proline Induced by Hydrogen-Bond-Donating Cocatalysts. J Org Chem 2014; 79:1166-73. [DOI: 10.1021/jo402605n] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Xiao-Song Xue
- State Key Laboratory of Elemento-Organic
Chemistry, Collaborative Innovation Center of Chemical Science and
Engineering, Department of Chemistry, Nankai University, Tianjin 300071, China
| | - Chen Yang
- State Key Laboratory of Elemento-Organic
Chemistry, Collaborative Innovation Center of Chemical Science and
Engineering, Department of Chemistry, Nankai University, Tianjin 300071, China
| | - Xin Li
- State Key Laboratory of Elemento-Organic
Chemistry, Collaborative Innovation Center of Chemical Science and
Engineering, Department of Chemistry, Nankai University, Tianjin 300071, China
| | - Jin-Pei Cheng
- State Key Laboratory of Elemento-Organic
Chemistry, Collaborative Innovation Center of Chemical Science and
Engineering, Department of Chemistry, Nankai University, Tianjin 300071, China
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20
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Xue XS, Yang C, Li X, Cheng JP. Computation of standard equilibrium acidity of C–H acids in ionic media: shedding light on predicting changes of chemical behavior by switching solvent system from molecular to ionic. Org Chem Front 2014. [DOI: 10.1039/c3qo00070b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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21
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Kaur D, Sharma R. Insight into the acidic behavior of oxazolidin-2-one, its thione and selone analogs through computational techniques. Struct Chem 2013. [DOI: 10.1007/s11224-013-0382-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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22
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Bayat A, Fattahi A. Investigation of the scavenging mechanism of tyrosyl radical by hydroxybenzohydroxamic acid derivatives: A DFT study. COMPUT THEOR CHEM 2013. [DOI: 10.1016/j.comptc.2013.05.026] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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23
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Yang C, Xue XS, Jin JL, Li X, Cheng JP. Theoretical Study on the Acidities of Chiral Phosphoric Acids in Dimethyl Sulfoxide: Hints for Organocatalysis. J Org Chem 2013; 78:7076-85. [DOI: 10.1021/jo400915f] [Citation(s) in RCA: 83] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Chen Yang
- State
Key Laboratory of Elemento-organic Chemistry and ‡Computational Center of Molecular
Science, Department of Chemistry, Nankai University, Tianjin 300071
| | - Xiao-Song Xue
- State
Key Laboratory of Elemento-organic Chemistry and ‡Computational Center of Molecular
Science, Department of Chemistry, Nankai University, Tianjin 300071
| | - Jia-Lu Jin
- State
Key Laboratory of Elemento-organic Chemistry and ‡Computational Center of Molecular
Science, Department of Chemistry, Nankai University, Tianjin 300071
| | - Xin Li
- State
Key Laboratory of Elemento-organic Chemistry and ‡Computational Center of Molecular
Science, Department of Chemistry, Nankai University, Tianjin 300071
| | - Jin-Pei Cheng
- State
Key Laboratory of Elemento-organic Chemistry and ‡Computational Center of Molecular
Science, Department of Chemistry, Nankai University, Tianjin 300071
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24
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Hou X, Yuan WC, Fang DM, Luo SW, Wu ZJ. Unexpected [M-H + Na]+˙ radical ions in 3-isothiocyanato oxindoles detected by electrospray mass spectrometry. JOURNAL OF MASS SPECTROMETRY : JMS 2013; 48:344-347. [PMID: 23494790 DOI: 10.1002/jms.3144] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/28/2012] [Revised: 11/17/2012] [Accepted: 11/20/2012] [Indexed: 06/01/2023]
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Shokri A, Schmidt J, Wang XB, Kass SR. Characterization of a Saturated and Flexible Aliphatic Polyol Anion Receptor. J Am Chem Soc 2012; 134:16944-7. [DOI: 10.1021/ja3075456] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alireza Shokri
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455,
United States
| | - Jacob Schmidt
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455,
United States
| | - Xue-Bin Wang
- Chemical & Materials Sciences Division, Pacific Northwest National Laboratory, P.O. Box 999, MS K8-88, Richland, Washington 99352, United States
| | - Steven R. Kass
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455,
United States
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26
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Maksić ZB, Kovačević B, Vianello R. Advances in Determining the Absolute Proton Affinities of Neutral Organic Molecules in the Gas Phase and Their Interpretation: A Theoretical Account. Chem Rev 2012; 112:5240-70. [DOI: 10.1021/cr100458v] [Citation(s) in RCA: 154] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Zvonimir B. Maksić
- Quantum Organic
Chemistry Group, Department of Organic
Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička 54, HR-10000 Zagreb, Croatia
| | - Borislav Kovačević
- Quantum Organic
Chemistry Group, Department of Organic
Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička 54, HR-10000 Zagreb, Croatia
| | - Robert Vianello
- Quantum Organic
Chemistry Group, Department of Organic
Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička 54, HR-10000 Zagreb, Croatia
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27
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Himmel D, Goll SK, Leito I, Krossing I. Bulk Gas-Phase Acidity. Chemistry 2012; 18:9333-40. [DOI: 10.1002/chem.201104025] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2011] [Indexed: 11/07/2022]
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28
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Wen H, Hou GL, Huang W, Govind N, Wang XB. Photoelectron spectroscopy of higher bromine and iodine oxide anions: Electron affinities and electronic structures of BrO2,3 and IO2–4 radicals. J Chem Phys 2011; 135:184309. [DOI: 10.1063/1.3658858] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
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29
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Despotović I, Maksić ZB. The high affinity of azacalix[3](2,6)pyridine derivatives for Be2+ cations—a DFT study. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.09.078] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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30
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Li Y, Zhou W, Zhang J, Li S, Gao H, Zhou Z. Theoretical calculation of heats of formation, bond dissociation energies, and gas-phase acidities of fluoromethanes, chloromethanes, and eight other monoderivatives of methane. COMPUT THEOR CHEM 2011. [DOI: 10.1016/j.comptc.2011.05.004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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31
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Vianello R, Maksić ZB. Polycyano Derivatives of some Organic Tri- and Hexacyclic Molecules Are Powerful Super- and Hyperacids in the Gas Phase and DMSO: Computational Study by DFT Approach. J Org Chem 2010; 75:7670-81. [DOI: 10.1021/jo101581a] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Robert Vianello
- Quantum Organic Chemistry Group, Ruđer, Bošković Institute, Bijenička 54, HR-10000 Zagreb, Croatia
- Laboratory for Biocomputing and Bioinformatics, National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia
| | - Zvonimir B. Maksić
- Quantum Organic Chemistry Group, Ruđer, Bošković Institute, Bijenička 54, HR-10000 Zagreb, Croatia
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