1
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Xue Y, Sexton TM, Yang J, Tschumper GS. Systematic analysis of electronic barrier heights and widths for concerted proton transfer in cyclic hydrogen bonded clusters: (HF) n, (HCl) n and (H 2O) n where n = 3, 4, 5. Phys Chem Chem Phys 2024; 26:12483-12494. [PMID: 38619858 DOI: 10.1039/d4cp00422a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/16/2024]
Abstract
The MP2 and CCSD(T) methods are paired with correlation consistent basis sets as large as aug-cc-pVQZ to optimize the structures of the cyclic minima for (HF)n, (HCl)n and (H2O)n where n = 3-5, as well as the corresponding transition states (TSs) for concerted proton transfer (CPT). MP2 and CCSD(T) harmonic vibrational frequencies confirm the nature of each minimum and TS. Both conventional and explicitly correlated CCSD(T) computations are employed to assess the electronic dissociation energies and barrier heights for CPT near the complete basis (CBS) limit for all 9 clusters. Results for (HF)n are consistent with prior studies identifying Cnh and Dnh point group symmetry for the minima and TSs, respectively. Our computations also confirm that CPT proceeds through Cs TS structures for the C1 minima of (H2O)3 and (H2O)5, whereas the process goes through a TS with D2d symmetry for the S4 global minimum of (H2O)4. This work corroborates earlier findings that the minima for (HCl)3, (HCl)4 and (HCl)5 have C3h, S4 and C1 point group symmetry, respectively, and that the Cnh structures are not minima for n = 4 and 5. Moreover, our computations show the TSs for CPT in (HCl)3, (HCl)4 and (HCl)5 have D3h, D2d, and C2 point group symmetry, respectively. At the CCSD(T) CBS limit, (HF)4 and (HF)5 have the smallest electronic barrier heights for CPT (≈15 kcal mol-1 for both), followed by the HF trimer (≈21 kcal mol-1). The barriers are appreciably higher for the other clusters (around 27 kcal mol-1 for (H2O)4 and (HCl)3; roughly 30 kcal mol-1 for (H2O)3, (H2O)5 and (HCl)4; up to 38 kcal mol-1 for (HCl)5). At the CBS limit, MP2 significantly underestimates the CCSD(T) barrier heights (e.g., by ca. 2, 4 and 7 kcal mol-1 for the pentamers of HF, H2O and HCl, respectively), whereas CCSD overestimates these barriers by roughly the same magnitude. Scaling the barrier heights and dissociation energies by the number of fragments in the cluster reveals strong linear relationships between the two quantities and with the magnitudes of the imaginary vibrational frequency for the TSs.
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Affiliation(s)
- Yuan Xue
- Department of Chemistry and Biochemistry, University of Mississippi, University, MS 38677-1848, USA.
| | - Thomas More Sexton
- School of Arts and Sciences, Chemistry University of Mary, Bismark, ND 58504, USA.
| | - Johnny Yang
- Department of Chemistry and Biochemistry, University of Mississippi, University, MS 38677-1848, USA.
| | - Gregory S Tschumper
- Department of Chemistry and Biochemistry, University of Mississippi, University, MS 38677-1848, USA.
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2
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Rock CA, Tschumper GS. Insight into the Binding of Argon to Cyclic Water Clusters from Symmetry-Adapted Perturbation Theory. Int J Mol Sci 2023; 24:17480. [PMID: 38139311 PMCID: PMC10744083 DOI: 10.3390/ijms242417480] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Revised: 12/06/2023] [Accepted: 12/07/2023] [Indexed: 12/24/2023] Open
Abstract
This work systematically examines the interactions between a single argon atom and the edges and faces of cyclic H2O clusters containing three-five water molecules (Ar(H2O)n=3-5). Full geometry optimizations and subsequent harmonic vibrational frequency computations were performed using MP2 with a triple-ζ correlation consistent basis set augmented with diffuse functions on the heavy atoms (cc-pVTZ for H and aug-cc-pVTZ for O and Ar; denoted as haTZ). Optimized structures and harmonic vibrational frequencies were also obtained with the two-body-many-body (2b:Mb) and three-body-many-body (3b:Mb) techniques; here, high-level CCSD(T) computations capture up through the two-body or three-body contributions from the many-body expansion, respectively, while less demanding MP2 computations recover all higher-order contributions. Five unique stationary points have been identified in which Ar binds to the cyclic water trimer, along with four for (H2O)4 and three for (H2O)5. To the best of our knowledge, eleven of these twelve structures have been characterized here for the first time. Ar consistently binds more strongly to the faces than the edges of the cyclic (H2O)n clusters, by as much as a factor of two. The 3b:Mb electronic energies computed with the haTZ basis set indicate that Ar binds to the faces of the water clusters by at least 3 kJ mol-1 and by nearly 6 kJ mol-1 for one Ar(H2O)5 complex. An analysis of the interaction energies for the different binding motifs based on symmetry-adapted perturbation theory (SAPT) indicates that dispersion interactions are primarily responsible for the observed trends. The binding of a single Ar atom to a face of these cyclic water clusters can induce perturbations to the harmonic vibrational frequencies on the order of 5 cm-1 for some hydrogen-bonded OH stretching frequencies.
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Affiliation(s)
| | - Gregory S. Tschumper
- Department of Chemistry and Biochemistry, University of Mississippi, University, MS 38677-1848, USA
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3
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Promkatkaew M, Boonsri P, Suramitr S, Karpkird T, Wolschann P, Hannongbua S. Stability improvement of UV-filter between methoxy cinnamic acid derivatives and cyclodextrins inclusion complexes based on DFT and TD-DFT investigations. J Mol Graph Model 2023; 125:108619. [PMID: 37666055 DOI: 10.1016/j.jmgm.2023.108619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 08/21/2023] [Accepted: 08/29/2023] [Indexed: 09/06/2023]
Abstract
Structures and UV-vis absorption spectra of the host-guest interaction of the methoxy cinnamic acid (MCA) derivatives and cyclodextrins (CDs) were performed by using the density functional theory (DFT) and time-dependent DFT (TD-DFT) calculations. All geometries of MCA derivatives (4-MCA, 245-MCA, 246-MCA), three types of CD (αCD, βCD, γCD), and five host-guest inclusion complexes between MCA and CD consisting of 4-MCA/αCD (1), 4-MCA/βCD (2), 245-MCA/βCD (3), 246-MCA/βCD (4), and 246-MCA/γCD (5) were fully optimized by using the M06-2X/6-31G (d,p) levels of theory. Two orientations (A and B) of the MCA guest molecule were considered. Upon examining the optimized geometry, five complexes of the methoxy cinnamic acid molecules are located inside the cavity of CD. Orientation B was more stable than orientation A because of the stronger intermolecular hydrogen bonds between the hydroxyl group of CD and the carboxylic group of MCA. The results indicated that the intermolecular hydrogen bond is mainly the driving force of formation between methoxy cinnamic acid and cyclodextrins. To reveal the host-guest interaction that is relevant to UV-filter compounds, the UV-vis absorption spectra were performed using TD-DFT calculations. The obtained results confirmed that orientation B is the most stable orientation and can absorb in both UVB and UVA regions which is similar to the parent MCA. Therefore, this knowledge will bring to understand the host-guest interaction between methoxy cinnamic acid and cyclodextrin complexes. The theoretical results are expected to provide valuable information for improving the stability of further UV-filter compounds.
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Affiliation(s)
- Malinee Promkatkaew
- Faculty of Science at Sriracha, Kasetsart University Sriracha Campus, Chonburi, 20230, Thailand.
| | - Pornthip Boonsri
- Department of Chemistry, Faculty of Science, Srinakharinwirot University, Bangkok, 10110, Thailand
| | - Songwut Suramitr
- Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok, 10900, Thailand
| | - Thitinun Karpkird
- Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok, 10900, Thailand
| | - Peter Wolschann
- Institute of Theoretical Chemistry, University of Vienna, Vienna, 1090, Austria
| | - Supa Hannongbua
- Department of Chemistry, Faculty of Science, Kasetsart University, Bangkok, 10900, Thailand.
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4
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Martínez-Bachs B, Rimola A. Gas-Phase vs. Grain-Surface Formation of Interstellar Complex Organic Molecules: A Comprehensive Quantum-Chemical Study. Int J Mol Sci 2023; 24:16824. [PMID: 38069147 PMCID: PMC10706303 DOI: 10.3390/ijms242316824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 11/20/2023] [Accepted: 11/24/2023] [Indexed: 12/18/2023] Open
Abstract
Several organic chemical compounds (the so-called interstellar complex organic molecules, iCOMs) have been identified in the interstellar medium (ISM). Examples of iCOMs are formamide (HCONH2), acetaldehyde (CH3CHO), methyl formate (CH3OCHO), or formic acid (HCOOH). iCOMs can serve as precursors of other organic molecules of enhanced complexity, and hence they are key species in chemical evolution in the ISM. The formation of iCOMs is still a subject of a vivid debate, in which gas-phase or grain-surface syntheses have been postulated. In this study, we investigate the grain-surface-formation pathways for the four above-mentioned iCOMs by transferring their primary gas-phase synthetic routes onto water ice surfaces. Our objective is twofold: (i) to identify potential grain-surface-reaction mechanisms leading to the formation of these iCOMs, and (ii) to decipher either parallelisms or disparities between the gas-phase and the grain-surface reactions. Results obtained indicate that the presence of the icy surface modifies the energetic features of the reactions compared to the gas-phase scenario, by increasing some of the energy barriers. Therefore, the investigated gas-phase mechanisms seem unlikely to occur on the icy grains, highlighting the distinctiveness between the gas-phase and the grain-surface chemistry.
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Affiliation(s)
| | - Albert Rimola
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Catalonia, Spain;
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Olive LN, Dornshuld EV, Schaefer HF, Tschumper GS. Competition between Solvent···Solvent and Solvent···Solute Interactions in the Microhydration of the Tetrafluoroborate Anion, BF 4-(H 2O) n=1,2,3,4. J Phys Chem A 2023; 127:8806-8820. [PMID: 37774368 DOI: 10.1021/acs.jpca.3c04014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/01/2023]
Abstract
This study systematically examines the interactions of the tetrafluoroborate anion (BF4-) with up to four water molecules (BF4-(H2O)n=1,2,3,4). Full geometry optimizations and subsequent harmonic vibrational frequency computations are performed using a variety of density functional theory (DFT) methods (B3LYP, B3LYP-D3BJ, and M06-2X) and the MP2 ab initio method with a triple-ζ correlation consistent basis set augmented with diffuse functions on all non-hydrogen atoms (cc-pVTZ for H and aug-cc-pVTZ for B, O, and F; denoted as haTZ). Optimized structures and harmonic vibrational frequencies were also obtained with the CCSD(T) ab initio method and the haTZ basis set for the mono- and dihydrate (n = 1, 2) structures. The 2-body:Many-body (2b:Mb) technique, in which CCSD(T) computations capture the 1- and 2-body contributions to the interactions and MP2 computations recover all higher-order contributions, was used to extend these demanding computations to the tri- and tetrahydrate (n = 3, 4) systems. Four, five, and eight new stationary points have been identified for the di-, tri-, and tetrahydrate systems, respectively. The global minimum of the monohydrate adopts a symmetric double ionic hydrogen bond motif with C2v symmetry and an electronic dissociation energy of 13.17 kcal mol-1 at the CCSD(T)/haTZ level of theory. This strong solvent···solute interaction, however, competes with solute···solute interactions in the lowest-energy BF4-(H2O)n=2,3,4 minima that are not seen in the other di-, tri-, or tetrahydrate minima. The latter interactions help increase the 2b:Mb dissociation energies to more than 26, 41, and 51 kcal mol-1 for n = 2, 3, and 4, respectively. Structures that form hydrogen bonds between the solvating water molecules also exhibit the largest shifts in the harmonic OH stretching frequencies for the waters of hydration. These shifts can exceed -280 cm-1 relative to an isolated H2O molecule at the 2b:Mb/haTZ level of theory.
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Affiliation(s)
- Laura N Olive
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, United States
| | - Eric V Dornshuld
- Department of Chemistry, Mississippi State University, Mississippi State, Mississippi 39762, United States
| | - Henry F Schaefer
- Center for Computational Quantum Chemistry, University of Georgia, Athens, Georgia 30602, United States
| | - Gregory S Tschumper
- Department of Chemistry and Biochemistry, University of Mississippi, University, Mississippi 38677, United States
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6
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Bancone N, Pantaleone S, Ugliengo P, Rimola A, Corno M. Adsorption of HCN on cosmic silicates: a periodic quantum mechanical study. Phys Chem Chem Phys 2023; 25:26797-26812. [PMID: 37781958 DOI: 10.1039/d3cp01459b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/03/2023]
Abstract
Hydrogen cyanide (HCN) represents a small but widely distributed fraction of the interstellar molecules, and it has been observed in all the environments characterizing the formation of a new planetary system. HCN can polymerize to form biomolecules, including adenine (H5C5N5), and it has drawn attention as a possible precursor of several building blocks of life due to the presence of its polymerization products in meteorites, comets and other asteroidal bodies. To elucidate the potential catalytic role that cosmic silicates have played in these processes, we have investigated, at DFT-PBE level inclusive of a posteriori dispersion correction, the energetic and spectroscopic features of the adsorption of HCN molecules on the most relevant crystalline surfaces of the mineral forsterite (Mg2SiO4), a common silicate constituent of the interstellar core grains and planetary rocky bodies. The results reveal that HCN adsorbs both in molecular and dissociative ways, within a wide range of adsorption energies (-29.4 to -466.4 kJ mol-1). Thermodynamic and kinetic results show that dissociative adsorption is dominant already at low temperatures, a fact particularly relevant at the protoplanetary conditions (i.e., the latest stages in the star system formation process). The simulated spectroscopic features of the studied adducts show a wide range of different degrees of perturbation of C-H and CN bonds. This finding agrees with previous experimental works, and our results confirm that a complex chemistry is observed when this astrochemically-relevant molecule interacts with Mg2SiO4, which may be associated with a considerable potential reactivity towards the formation of relevant prebiotic compounds.
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Affiliation(s)
- Niccolò Bancone
- Dipartimento di Chimica and NIS - Nanostructured Interfaces and Surfaces - Centre, Università degli Studi di Torino, via P. Giuria 7, 10125, Torino, Italy.
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain.
| | - Stefano Pantaleone
- Dipartimento di Chimica and NIS - Nanostructured Interfaces and Surfaces - Centre, Università degli Studi di Torino, via P. Giuria 7, 10125, Torino, Italy.
| | - Piero Ugliengo
- Dipartimento di Chimica and NIS - Nanostructured Interfaces and Surfaces - Centre, Università degli Studi di Torino, via P. Giuria 7, 10125, Torino, Italy.
| | - Albert Rimola
- Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain.
| | - Marta Corno
- Dipartimento di Chimica and NIS - Nanostructured Interfaces and Surfaces - Centre, Università degli Studi di Torino, via P. Giuria 7, 10125, Torino, Italy.
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7
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Sripaturad P, Karton A, Stevens K, Thamwattana N, Baowan D, Cox BJ. Catalytic effect of graphene on the inversion of corannulene using a continuum approach with the Lennard-Jones potential. NANOSCALE ADVANCES 2023; 5:4571-4578. [PMID: 37638156 PMCID: PMC10448309 DOI: 10.1039/d3na00349c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Accepted: 07/28/2023] [Indexed: 08/29/2023]
Abstract
The catalytic effect of graphene on the corannulene bowl-to-bowl inversion is confirmed in this paper using a pair-wise dispersion interaction model. In particular, a continuum approach together with the Lennard-Jones potential are adopted to determine the interaction energy between corannulene and graphene. These results are consistent with previous quantum chemical studies, which showed that a graphene sheet reduces the barrier height for the bowl-to-bowl inversion in corannulene. However, the results presented here demonstrate, for the first time, that the catalytic activity of graphene can be reproduced using pair-wise dispersion interactions alone. This demonstrates the major role that pair-wise dispersion interactions play in the catalytic activity of graphene.
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Affiliation(s)
- Panyada Sripaturad
- Department of Mathematics, Faculty of Science, Mahidol University Rama VI Rd Bangkok 10400 Thailand
| | - Amir Karton
- School of Science and Technology, University of New England Armidale NSW 2351 Australia
| | - Kyle Stevens
- School of Information and Physical Sciences, University of Newcastle Callaghan NSW 2308 Australia
| | - Ngamta Thamwattana
- School of Information and Physical Sciences, University of Newcastle Callaghan NSW 2308 Australia
| | - Duangkamon Baowan
- Department of Mathematics, Faculty of Science, Mahidol University Rama VI Rd Bangkok 10400 Thailand
| | - Barry J Cox
- School of Mathematical Sciences, University of Adelaide Adelaide SA 5005 Australia
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8
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Seuret-Hernández HY, Morera-Boado C. DFT Study of the Adsorption and SERS of Pyridine on M 10N 10 (M, N = Cu, Ag) Tetrahedral Clusters. J Phys Chem A 2023; 127:6697-6710. [PMID: 37535928 DOI: 10.1021/acs.jpca.3c02368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/05/2023]
Abstract
This work presents a theoretical detailed analysis of the surface-enhanced Raman spectroscopy (SERS) of the pyridine-M10N10 (M, N = Ag, Cu) tetrahedral (Td) clusters considering two binding positions: vertex (V) and surface (S). In addition to the well-known monometallic Td structure, we added two different bimetallic Ag-Cu compositions, named Td1 and Td2 geometries. Density functional methodology with the use of BP86 and CAM-B3LYP exchange-correlation functionals (XCs) and LANL2DZ pseudopotential has been employed for analyzing the electronic structure and geometries, the chemical static (CHEM), and resonant Raman mechanisms (RR): charge transfer RR-CT and intracluster excitation RR-CR. The static CHEM mechanism shows an increase in the enhancement factors (EFs) of Py-V concerning Py-S positions, which can also be distinguished by the averaged adsorption energies and bond polarizabilities. The static SERS response for Cu-Py-V junction is from 5 to 10 times greater than Ag-Py-V EFs and up to 28 times greater than Py-S complexes. For the static Raman, we found that the analyses of ν8a and ν1 normal modes are related to the EF changes and allow us to distinguish V from S complexes. The TDDFT calculations show striking differences between BP86 and CAM-B3LYP XCs analyzed spectra, and CAM-B3LYP granted a clear distinction between V and S for the location of CT-type transitions. In addition, important differences were obtained from the analysis of the charge transfer excitations between both XCs. Resonant Raman calculations evidenced significant enhancements for RR-CT and RR-CR as compared to the static enhancements, and RR-CT can be distinguished from the RR-CR mechanism, while specific normal modes help to differentiate the vertex from the surface Py-junction. Bimetallic Ag-Cu nanostructures represent promising choices for SERS substrates, showing EFs higher than those of monometallic Ag.
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Affiliation(s)
- Halis Yenis Seuret-Hernández
- Centro de Investigaciones Químicas, IICBA, Universidad Autónoma del Estado de Morelos, Cuernavaca, 62209, Morelos, Mexico
| | - Cercis Morera-Boado
- Centro de Investigaciones Químicas, IICBA, Universidad Autónoma del Estado de Morelos, Cuernavaca, 62209, Morelos, Mexico
- Cátedra Conahcyt-Centro de Investigaciones Químicas, IICBA, Universidad Autónoma del Estado de Morelos, Cuernavaca, 62209, Morelos, Mexico
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9
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Solovyova IV, Yang S, Starovoytov ON. Molecular dynamics simulation studies of 1,3-dimethyl imidazolium nitrate ionic liquid with water. J Chem Phys 2023; 158:084505. [PMID: 36859108 DOI: 10.1063/5.0134465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
The fundamental understanding of intermolecular interactions of ionic liquids (ILs) with water is essential in predicting IL-water thermodynamic properties. In this study, intermolecular or noncovalent interactions were studied for 1,3-dimethyl imidazolium [DMIM]+ cation and nitrate [NO3]- anion with water, employing quantum mechanics and molecular dynamics simulations. Molecular dynamics simulations were performed using a revised multipolar polarizable force field. The effect of water on ionic liquids was evaluated in terms of thermodynamic and dynamic properties. Thermodynamic properties included liquid densities ρ, excess molar volumes ΔVE, and liquid structures gr. Dynamic properties included self-diffusion coefficients D of mixture constituents as a function of water concentration. The density of ionic liquid-water mixtures monotonically decrease with increasing concentration of water. A negative excess volume was obtained for low and high water concentrations, demonstrating strong intermolecular interactions of water with ionic liquid components. Liquid structures of ionic liquid-water mixtures revealed a tendency for anions to interact with cations at shorter intermolecular distances when the water concentration is increased. Diffusion rates were found to increase for all mixture components with increase in the fraction of water. A significant change in the diffusion rate was found at ∼0.3 weight fraction of water. However, the water self-diffusion coefficient was dominant at all concentrations. The ratio of water/anion and anion/cation self-diffusion coefficients was found to decrease linearly with increasing concentration of water molecules.
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Affiliation(s)
- Iana V Solovyova
- Institute of Engineering Science, Ural Branch of the Russian Academy of Sciences, Yekaterinburg 620049, Russia
| | - Shizhong Yang
- Southern University and A&M College, Department of Computer Science, Baton Rouge, Louisiana 70807, USA
| | - Oleg N Starovoytov
- Southern University and A&M College, Department of Computer Science, Baton Rouge, Louisiana 70807, USA
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10
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Perkins MA, Tschumper GS. Characterization of competing halogen-bonding and hydrogen-bonding motifs in the acetonitrile/hydrogen iodide dimer. Chem Phys 2023. [DOI: 10.1016/j.chemphys.2023.111843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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11
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Thermophysical modelling of transport and optical properties of 1-propanol+1,3-diaminopropane or 1,2-diaminopropane or 1-amino-2-propanol binary liquid mixture at T=298.15-318.15 K: Molecular interaction analysis by density functional theory (DFT) and graph theoretical approach (GTA). J Taiwan Inst Chem Eng 2023. [DOI: 10.1016/j.jtice.2022.104641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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12
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Hosseini SM, Soltanabadi A, Abdouss M, Mazinani S. Investigating the structure of the product of graphene oxide reaction with folic acid and chitosan: density functional theory calculations. J Biomol Struct Dyn 2022; 40:14146-14159. [PMID: 34791994 DOI: 10.1080/07391102.2021.2001372] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Chitosan biopolymer was used to modify the level of graphene oxide. And the composite prepared from graphene oxide/chitosan, due to its favorable physical and chemical properties, have been used as a drug delivery system. In this study, the adsorption of Folic acid on the carrier was investigated using density functional theory (DFT). The geometry optimizations, electronic structures, and gas-phase properties of widely applicable graphene (G), graphene oxide (GO), chitosan (CS), folic acid (FA), GO-CS and GO-CS-FA were investigated using DFT. The studied molecules are based on graphene oxide. In GO-CS, DFT calculation show that two Chitosan connected to the GO molecule on both opposite sides, so that two Chitosan have maximum distance from each other. Finally, the electronic structure of FA was obtained with this molecule calculated and discussed. The interaction of hydrogen bonds in the most stable pair formers between molecules were determined. Furthermore, the hydrogen bonds were studied by atom in molecules natural bond orbital analyses.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
| | - Azim Soltanabadi
- Department of Physical Chemistry, Faculty of Chemistry, Razi University, Kermanshah, Iran
| | - Majid Abdouss
- Department of Chemistry, Amirkabir University of Technology, Tehran, Iran
| | - Saeedeh Mazinani
- New Technologies Research Center (NTRC), Amirkabir University of Technology, Tehran, Iran
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13
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Blasco D, Sundholm D. Gold(I)···Lanthanide(III) Bonds in Discrete Heterobimetallic Compounds: A Combined Computational and Topological Study. Inorg Chem 2022; 61:20308-20315. [PMID: 36475614 PMCID: PMC9768751 DOI: 10.1021/acs.inorgchem.2c02717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The chemical nature of the ligand-unsupported gold(I)-lanthanide(III) bond in the proposed [LnIII(η5-Cp)2][AuIPh2] (Ln-Au; LnIII = LaIII, EuIII, or LuIII; Cp = cyclopentadienide; Ph = phenyl) models is examined from a theoretical viewpoint. The covalent bond-like Au-Ln distances (Au-La, 2.95 Å; Au-Eu, 2.85 Å; Au-Lu, 2.78 Å) result from a strong interaction between the oppositely charged fragments (ΔEintMP2 > 600 kJ mol-1), including the aforementioned metal-metal bond and additional LnIII-Cipso and C-H···π interactions. The Au-Ln bond has been characterized as a chemical bond rather than a strong metallophilic interaction with the aid of energy decomposition analysis, interaction region indicator, and quantum theory of atoms in molecules topological tools. The chemical nature of the Au-Ln bond cannot be fully ascribed to a covalent or an ionic model; an intermediate situation or a charge shift bond is proposed. The [AuIPh2]- anion has also been identified as a suitable lanthanide(III) emission sensitizer for La-Au and Lu-Au.
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Affiliation(s)
- Daniel Blasco
- Department
of Chemistry, Faculty of Science, University
of Helsinki, P.O. Box 55
(A.I. Virtasen aukio 1), FIN-00014Helsinki, Finland,Departamento
de Química, Centro de Investigación en Síntesis
Química (CISQ), Universidad de La
Rioja, Madre de Dios 53, 26006Logroño, Spain, or
| | - Dage Sundholm
- Department
of Chemistry, Faculty of Science, University
of Helsinki, P.O. Box 55
(A.I. Virtasen aukio 1), FIN-00014Helsinki, Finland,
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14
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Speake BT, Irons TJP, Wibowo M, Johnson AG, David G, Teale AM. An Embedded Fragment Method for Molecules in Strong Magnetic Fields. J Chem Theory Comput 2022; 18:7412-7427. [PMID: 36414537 DOI: 10.1021/acs.jctc.2c00865] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
An extension of the embedded fragment method for calculations on molecular clusters is presented, which includes strong external magnetic fields. The approach is flexible, allowing for calculations at the Hartree-Fock, current-density-functional theory, Møller-Plesset perturbation theory, and coupled-cluster levels using London atomic orbitals. For systems consisting of discrete molecular subunits, calculations using London atomic orbitals can be performed in a computationally tractable manner for systems beyond the reach of conventional calculations, even those accelerated by resolution-of-the-identity or Cholesky decomposition methods. To assess the applicability of the approach, applications to water clusters are presented, showing how strong magnetic fields enhance binding within the clusters. However, our calculations suggest that, contrary to previous suggestions in the literature, this enhanced binding may not be directly attributable to strengthening of hydrogen bonding. Instead, these results suggest that this arises for larger field strengths as a response of the system to the presence of the external field, which induces a charge density build up between the monomer units. The approach is embarrassingly parallel and its computational tractability is demonstrated for clusters of up to 103 water molecules in triple-ζ basis sets, which would correspond to conventional calculations with more than 12 000 basis functions.
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Affiliation(s)
- Benjamin T Speake
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, United KIngdom
| | - Tom J P Irons
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, United KIngdom
| | - Meilani Wibowo
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, United KIngdom
| | - Andrew G Johnson
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, United KIngdom
| | - Grégoire David
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, United KIngdom.,Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes)-UMR 6226, F-35000 Rennes, France
| | - Andrew M Teale
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, United KIngdom.,Hylleraas Centre for Quantum Molecular Sciences, Department of Chemistry, University of Oslo, P.O. Box 1033 Blindern, N-0315 Oslo, Norway
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15
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Zhang C, Li W, Ning B. Enantiomeric Resolution of Pidotimod and Its Isomers in Pidotimod Oral Solutions Using Chiral RP-HPLC with Quadrupole Dalton Analyzer Detection. Chromatographia 2022. [DOI: 10.1007/s10337-022-04224-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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16
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Kalout H, Boubegtiten-Fezoua Z, Maurel F, Hellwig P, Ferlay S. An accurate vibrational signature in halogen bonded molecular crystals. Phys Chem Chem Phys 2022; 24:15103-15109. [PMID: 35698883 DOI: 10.1039/d2cp01336c] [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
The far infrared (FIR) and Raman fingerprints of the halogen bond in two representative 1D halogen bonded networks based on the recognition of TFIB, tetrafluorodiiodobenzene, with piperazine or azopyridine, have been accurately identified. It was demonstrated that the signature of the halogen bonding in the solid state, especially the N⋯I signal can be simply and directly evidenced in the far infrared region. The DFT theoretical calculations identified the N⋯I interaction in the molecular crystals and allowed estimation of the corresponding energies and distances of the involved halogen bonds, in accordance with the cristallographic data.
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Affiliation(s)
- Hanine Kalout
- Université de Strasbourg-CNRS, UMR 7140, F-67000 Strasbourg, France.
| | | | | | - Petra Hellwig
- Université de Strasbourg-CNRS, UMR 7140, F-67000 Strasbourg, France.
| | - Sylvie Ferlay
- Université de Strasbourg-CNRS, UMR 7140, F-67000 Strasbourg, France.
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17
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Perkins MA, Tschumper GS. Characterization of Competing Halogen- and Hydrogen-Bonding Motifs in Simple Mixed Dimers of HCN and HX (X = F, Cl, Br, and I). J Phys Chem A 2022; 126:3688-3695. [PMID: 35652358 DOI: 10.1021/acs.jpca.2c02041] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This work performs the first systematic comparison of hydrogen- and halogen-bonded configurations of the HCN/HX mixed dimer, where X = F, Cl, Br, and I. Eleven different minima have been characterized for these four heterogeneous dimers near the CCSD(T) complete basis set (CBS) limit. For each complex, two different hydrogen-bonded minima were identified: the global minimum where HX acts as the hydrogen bond donor and a local minimum where HX acts as the hydrogen bond acceptor. A halogen-bonded local minimum was also identified for all but the fluorine mixed dimer. To the best of our knowledge, three of the minima are identified here for the first time. The hydrogen- and halogen-bonded local minima of each complex become more energetically competitive with the global minimum as the atomic radius of the halogen atom increases. CCSD(T) relative energies of the hydrogen-bonded local minima computed near the CBS limit decrease from 4.5 kcal mol-1 for HCN/HF to 2.9, 2.4, and 1.2 kcal mol-1 for X = Cl, Br, and I, respectively. Corresponding relative energies for the halogen-bonded local minima range from 4.0 kcal mol-1 for X = Cl to 2.7 kcal mol-1 for X = Br and to as little as 0.5 kcal mol-1 X = I. Harmonic vibrational frequency shifts reported here suggest that it may be feasible to differentiate between the various minima for X = Cl, Br, and I via spectroscopic analysis, as was the case for the HCN/HF dimer.
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Affiliation(s)
- Morgan A Perkins
- Department of Chemistry and Biochemistry, University of Mississippi, University, Mississippi 38677-1848, United States
| | - Gregory S Tschumper
- Department of Chemistry and Biochemistry, University of Mississippi, University, Mississippi 38677-1848, United States
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18
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Visualization and Comprehension of Electronic and Topographic Contrasts on Cooperatively Switched Diarylethene-Bridged Ditopic Ligand. NANOMATERIALS 2022; 12:nano12081318. [PMID: 35458026 PMCID: PMC9029802 DOI: 10.3390/nano12081318] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Revised: 04/01/2022] [Accepted: 04/01/2022] [Indexed: 12/22/2022]
Abstract
Diarylethene is a prototypical molecular switch that can be reversibly photoisomerized between its open and closed forms. Ligands bpy-DAE-bpy, consisting of a phenyl-diarylethene-phenyl (DAE) central core and bipyridine (bpy) terminal substituents, are able to self-organize. They are investigated by scanning tunneling microscopy at the solid–liquid interface. Upon light irradiation, cooperative photochromic switching of the ligands is recognized down to the submolecular level. The closed isomers show different electron density of states (DOS) contrasts, attributed to the HOMO or LUMO molecular orbitals observed. More importantly, the LUMO images show remarkable differences between the open and closed isomers, attributed to combined topographic and electronic contrasts mainly on the DAE moieties. The electronic contrasts from multiple HOMO or LUMO distributions, combined with topographic distortion of the open or closed DAE, are interpreted by density functional theory (DFT) calculations.
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19
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Dihydrogen attachment and dissociation reactions in Fe(H)2(H2)(PEtPh2)3: a DFT potential-energy scan. Theor Chem Acc 2022. [DOI: 10.1007/s00214-022-02870-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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20
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Penschke C, Edler von Zander R, Beqiraj A, Zehle A, Jahn N, Neumann R, Saalfrank P. Water on porous, nitrogen-containing layered carbon materials: The performance of computational model chemistries. Phys Chem Chem Phys 2022; 24:14709-14726. [DOI: 10.1039/d2cp00657j] [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
Porous, layered materials containing sp2-hybridized carbon and nitrogen atoms, offer through their tunable properties, a versatile route towards tailormade catalysts for electrochemistry and photochemistry. A key molecule interacting with these...
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21
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Santra G, Semidalas E, Mehta N, Karton A, Martin JML. S66x8 noncovalent interactions revisited: new benchmark and performance of composite localized coupled-cluster methods. Phys Chem Chem Phys 2022; 24:25555-25570. [DOI: 10.1039/d2cp03938a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The S66x8 noncovalent interactions benchmark has been re-evaluated at the “sterling silver” level. Against this, a selection of computationally more economical alternatives has been assayed, ranging from localized CC to double hybrids and SAPT(DFT).
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Affiliation(s)
- Golokesh Santra
- Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, 7610001 Reḥovot, Israel
| | - Emmanouil Semidalas
- Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, 7610001 Reḥovot, Israel
| | - Nisha Mehta
- Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, 7610001 Reḥovot, Israel
| | - Amir Karton
- School of Molecular Sciences, The University of Western Australia, Perth, WA 6009, Australia
- School of Science and Technology, University of New England, Armidale, NSW 2351, Australia
| | - Jan M. L. Martin
- Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, 7610001 Reḥovot, Israel
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22
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Rostkowski M, Schürner HKV, Sowińska A, Vasquez L, Przydacz M, Elsner M, Dybala-Defratyka A. Isotope Effects on the Vaporization of Organic Compounds from an Aqueous Solution-Insight from Experiment and Computations. J Phys Chem B 2021; 125:13868-13885. [PMID: 34908428 PMCID: PMC8724799 DOI: 10.1021/acs.jpcb.1c05574] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
![]()
An isotope fractionation
analysis of organic groundwater pollutants
can assess the remediation at contaminated sites yet needs to consider
physical processes as potentially confounding factors. This study
explores the predictability of water–air partitioning isotope
effects from experiments and computational predictions for benzene
and trimethylamine (both H-bond acceptors) as well as chloroform (H-bond
donor). A small, but significant, isotope fractionation of different
direction and magnitude was measured with ε = −0.12‰
± 0.07‰ (benzene), εC = 0.49‰
± 0.23‰ (triethylamine), and εH = 1.79‰
± 0.54‰ (chloroform) demonstrating that effects do not
correlate with expected hydrogen-bond functionalities. Computations
revealed that the overall isotope effect arises from contributions
of different nature and extent: a weakening of intramolecular vibrations
in the condensed phase plus additional vibrational modes from a complexation
with surrounding water molecules. Subtle changes in benzene contrast
with a stronger coupling between intra- and intermolecular modes in
the chloroform–water system and a very local vibrational response
with few atoms involved in a specific mode of triethylamine. An energy
decomposition analysis revealed that each system was affected differently
by electrostatics and dispersion, where dispersion was dominant for
benzene and electrostatics dominated for chloroform and triethylamine.
Interestingly, overall stabilization patterns in all studied systems
originated from contributions of dispersion rather than other energy
terms.
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Affiliation(s)
- Michał Rostkowski
- Institute of Applied Radiation Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
| | - Heide K V Schürner
- Chair of Analytical Chemistry and Water Chemistry, Technical University of Munich, Elisabeth-Winterhalter-Weg 6, 81377 Munich, Germany
| | - Agata Sowińska
- Institute of Applied Radiation Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
| | - Luis Vasquez
- Institute of Applied Radiation Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
| | - Martyna Przydacz
- Institute of Applied Radiation Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
| | - Martin Elsner
- Chair of Analytical Chemistry and Water Chemistry, Technical University of Munich, Elisabeth-Winterhalter-Weg 6, 81377 Munich, Germany
| | - Agnieszka Dybala-Defratyka
- Institute of Applied Radiation Chemistry, Faculty of Chemistry, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland
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23
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Rock CA, Arradondo SN, Tschumper GS. Solvation of Isoelectronic Halide and Alkali Metal Ions by Argon Atoms. J Phys Chem A 2021; 125:10524-10531. [PMID: 34851634 DOI: 10.1021/acs.jpca.1c08069] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
This work systematically examines the interactions of alkali metal cations and their isoelectronic halide counterparts with up to six solvating Ar atoms (M+Arn and X-Arn, where M = Li, Na, K, and Rb; X = H, F, Cl, and Br; and n = 1-6) via full geometry optimizations with the MP2 method and robust, correlation-consistent quadruple-ζ (QZ) basis sets. 116 unique M+Arn and X-Arn stationary points have been characterized on the MP2/QZ potential energy surface. To the best of our knowledge, approximately two dozen of these stationary points have been reported here for the first time. Some of these new structures are either the lowest-energy stationary point for a particular cluster or energetically competitive with it. The CCSD(T) method was employed to perform additional single-point energy computations upon all MP2/QZ-optimized structures using the same basis set. CCSD(T)/QZ results indicate that internally solvated structures with the ion at/near the geometric center of the cluster have appreciably higher energies than those placing the ion on the periphery. While this study extends the prior investigations of M+Arn clusters found within the literature, it notably provides one of the first thorough characterizations of and comparisons to the corresponding negatively charged X-Arn clusters.
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Affiliation(s)
- Carly A Rock
- Department of Chemistry and Biochemistry, University of Mississippi, University, Mississippi 38677-1848, United States
| | - Sarah N Arradondo
- Department of Chemistry, Washington College, Chestertown, Maryland 21620-1438, United States
| | - Gregory S Tschumper
- Department of Chemistry and Biochemistry, University of Mississippi, University, Mississippi 38677-1848, United States
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24
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Tan JA, Teh S, Kuo JL. Structural and vibrational characterization of HCO + and Rg-HCO +, Rg = {He, Ne, Ar, Kr, and Xe}. J Chem Phys 2021; 155:174306. [PMID: 34742194 DOI: 10.1063/5.0069726] [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
The structures of the formyl ion (HCO+) and its rare gas tagged counterparts (Rg-HCO+, Rg = He, Ne, Ar, Kr, and Xe) were studied at the coupled-cluster singles, doubles, and perturbative triples [CCSD(T)]/aug-cc-pVTZ level of theory and basis set. A linear structure for these tagged complexes was predicted. The Rg binding energies for Rg-HCO+ are also examined at the CCSD(T) level. It was found that the binding interaction increases from He-HCO+ to Xe-HCO+. A multilevel potential energy surface built at the CCSD(T) and second-order Møller-Plesset perturbation levels of theory were used to study these species' vibrational spectra. By changing the Rg in the first-solvation shell for HCO+, the Fermi resonance interaction between the first H+ bend overtone and the asymmetric and symmetric H-C-O stretches can be modulated. This Fermi resonance modulation is demonstrated by examining a series of rare gas solvated HCO+.
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Affiliation(s)
- Jake A Tan
- Institute of Atomic and Molecular Sciences, Academia Sinica, No. 1 Roosevelt Road, Section 4, Da-an District, Taipei City 10617, Taiwan
| | - Soon Teh
- Institute of Atomic and Molecular Sciences, Academia Sinica, No. 1 Roosevelt Road, Section 4, Da-an District, Taipei City 10617, Taiwan
| | - Jer-Lai Kuo
- Institute of Atomic and Molecular Sciences, Academia Sinica, No. 1 Roosevelt Road, Section 4, Da-an District, Taipei City 10617, Taiwan
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25
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Titanium-doped Boron Nitride Fullerenes as Novel Single-atom Catalysts for CO Oxidation. Catal Letters 2021. [DOI: 10.1007/s10562-021-03762-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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26
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Witzke RJ, Hait D, Head-Gordon M, Tilley TD. Two-Coordinate Iron(I) Complexes on the Edge of Stability: Influence of Dispersion and Steric Effects. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00218] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ryan J. Witzke
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Diptarka Hait
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - Martin Head-Gordon
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - T. Don Tilley
- Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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27
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Bhattacharya S, Md Pratik S. Performance improvement of p-type dye sensitized solar cells by blending of dissimilar dyes. COMPUT THEOR CHEM 2021. [DOI: 10.1016/j.comptc.2021.113219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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28
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Yang L, Wang L, Lv X, Chen JH, Wang Y, Yang G. Complexation of triangular silver(I) or copper(I) nitropyrazolates with dibenzothiophenes having potential use in adsorptive desulfurization. Dalton Trans 2021; 50:2915-2927. [PMID: 33555282 DOI: 10.1039/d0dt04037a] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Triangular silver(i) and copper(i) 3,5-diethyl-4-nitropyrazolates (abbreviated as [Ag(denpz)]3 or Ag3pz3, and [Cu(denpz)]3 or Cu3pz3), as well as their adducts with dibenzothiophene (DBT), 4,6-dimethyldibenzothiophene (DMDBT) and benzothiophene (BT), have been prepared and characterized by a series of techniques. X-ray analyses show that these adducts are stabilized by MS, MC contacts and ππ stacking interactions. NMR measurements and theoretical calculations indicate that the intensity of interaction between the metal complexes and dibenzothiophenes follows the trend: Ag3pz3-DMDBT > Ag3pz3-DBT > Cu3pz3-DMDBT > Cu3pz3-DBT, which can be understood on the basis of a weak interaction between π-acid (Ag3pz3 or Cu3pz3) and π-base (DBT/DMDBT). Both complexes show good adsorptive ability and reusability toward the removal of DBT and DMDBT from model oil (n-octane), with the maximum adsorption capacity at room temperature being 39 mg S (DMDBT) per g Cu3pz3, 34 mg S (DMDBT) per g Ag3pz3, 40 mg S (DBT) per g Cu3pz3, 36 mg S (DBT) per g Ag3pz3, respectively. Compared to Ag3pz3, Cu3pz3 exhibits higher adsorptive capacities for DBT/DMDBT, which has been attributed to its lower molecular mass.
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Affiliation(s)
- Lin Yang
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China.
| | - Lihong Wang
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China.
| | - Xingpu Lv
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China.
| | - Jing-Huo Chen
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China.
| | - Yang Wang
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China.
| | - Guang Yang
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China.
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29
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Roy S, Paul P, Karar M, Joshi M, Paul S, Choudhury AR, Biswas B. Cascade detection of fluoride and bisulphate ions by newly developed hydrazine functionalised Schiff bases. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.115293] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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30
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Conformational Investigation of the Encapsulation of Nicotinic Acid Into β‐Cyclodextrin. ChemistrySelect 2021. [DOI: 10.1002/slct.202100197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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31
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Merkel K, Loska B, Welch C, Mehl GH, Kocot A. The role of intermolecular interactions in stabilizing the structure of the nematic twist-bend phase. RSC Adv 2021; 11:2917-2925. [PMID: 35424219 PMCID: PMC8693785 DOI: 10.1039/d0ra10481g] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2020] [Accepted: 01/04/2021] [Indexed: 12/20/2022] Open
Abstract
The understanding of the relationship between molecular structure and the formation of the nematic twist-bend phase is still at an early stage of development. This is mainly related to molecular geometry, while the correlation between the nematic twist-bend phase and the electronic structure is ambiguous. To explore the electronic effect on properties and stabilization of the nematic twist-bend phase we investigated 2′,3′-difluoro-4,4′′-dipentyl-p-terphenyl dimers (DTC5Cn). We used polarized fourier transform infrared spectroscopy, which can, at least in principle, provide information about the ordering in the twist-bend phase. All dimers show a significant drop in the average value of the transition dipole moment for parallel dipoles at the transition from the nematic to the twist-bend phase, and an increase for perpendicular dipoles, despite remaining unchanged for the monomer. Density functional theory calculations were used to determine the geometric and electronic properties of the hydrogen bonded complexes. We have provided experimental and theoretical evidence of stabilization of the nematic twist-bend phase by arrays of multiple hydrogen bonds (XF⋯HX, X–benzene ring). Stabilization of the nematic twist-band phase by arrays of multiple nonspecific short-range intermolecular interactions.![]()
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Affiliation(s)
- Katarzyna Merkel
- Institute of Materials Engineering, University of Silesia 75 Pułku Piechoty 1A 41-500 Chorzów Poland
| | - Barbara Loska
- Institute of Materials Engineering, University of Silesia 75 Pułku Piechoty 1A 41-500 Chorzów Poland
| | - Chris Welch
- Department of Chemistry, University of Hull Hull HU6 7RX UK
| | - Georg H Mehl
- Department of Chemistry, University of Hull Hull HU6 7RX UK
| | - Antoni Kocot
- Institute of Materials Engineering, University of Silesia 75 Pułku Piechoty 1A 41-500 Chorzów Poland
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32
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Mehta N, Goerigk L. Assessing the Applicability of the Geometric Counterpoise Correction in B2PLYP/Double-ζ Calculations for Thermochemistry, Kinetics, and Noncovalent Interactions. Aust J Chem 2021. [DOI: 10.1071/ch21133] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
We present a proof-of-concept study of the suitability of Kruse and Grimme’s geometric counterpoise correction (gCP) for basis set superposition errors (BSSEs) in double-hybrid density functional calculations with a double-ζ basis set. The gCP approach only requires geometrical information as an input and no orbital/density information is needed. Therefore, this correction is practically free of any additional cost. gCP is trained against the Boys and Bernardi counterpoise correction across a set of 528 noncovalently bound dimers. We investigate the suitability of the approach for the B2PLYP/def2-SVP level of theory, and reveal error compensation effects—missing London dispersion and the BSSE—associated with B2PLYP/def2-SVP calculations, and present B2PLYP-gCP-D3(BJ)/def2-SVP with the reparametrised DFT-D3(BJ) and gCP corrections as a more balanced alternative. Benchmarking results on the S66x8 benchmark set for noncovalent interactions and the GMTKN55 database for main-group thermochemistry, kinetics, and noncovalent interactions show a statistical improvement of the B2PLYP-gCP-D3(BJ) scheme over plain B2PLYP and B2PLYP-D3(BJ). B2PLYP-D3(BJ) shows significant overestimation of interaction energies, barrier heights with larger deviations from the reference values, and wrong relative stabilities in conformers, all of which can be associated with BSSE. We find that the gCP-corrected method represents a significant improvement over B2PLYP-D3(BJ), particularly for intramolecular noncovalent interactions. These findings encourage future developments of efficient double-hybrid DFT strategies that can be applied when double-hybrid calculations with large basis sets are not feasible due to system size.
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33
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Ahmed AA, Gypser S, Freese D, Leinweber P, Kühn O. Molecular level picture of the interplay between pH and phosphate binding at the goethite-water interface. Phys Chem Chem Phys 2020; 22:26509-26524. [PMID: 33185198 DOI: 10.1039/d0cp04698a] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The soil pH plays a substantial role in controlling phosphorus (P) adsorption and mobilization. These processes are strongly affected by the phosphate interaction strength with P-fixing soil minerals such as goethite. The target of the current contribution is to draw a molecular level picture of the interplay between pH and phosphate binding at the goethite-water interface via a joint experimental-theoretical approach. Periodic density functional theory (DFT) calculations were carried out to provide a molecular level understanding of the pH dependence of P adsorption. To validate the modeling approach, adsorption experiments of phosphate at goethite were performed in the pH range of 4-12. There was agreement between experiments and simulations in the description of the adsorption behavior by two pH-dependent successive stages. The adsorption increases along the pH change from 4 to 8. A further increase of pH leads to a decrease of adsorption. By comparing with literature data it is concluded that the first stage will be observed only if there is no significant change of the surface charge at low pH. Moreover, the molecular modeling results point to the abundance of the monodentate (M) binding motif at both extremely low and high pH ranges. Otherwise, the bidentate (B) one is predominant along the intermediate pH range. These observations could resolve the existing debate about the assignment of phosphate-goethite binding motifs. Furthermore, the results point to a decrease of pH upon phosphate sorption due to an induced acidification of soil solution. The present joint experimental-theoretical approach provides a better understanding and description of the existing phosphate sorption experiments and highlights new findings at the atomistic/molecular scale.
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Affiliation(s)
- Ashour A Ahmed
- University of Rostock, Institute of Physics, Albert-Einstein-Str. 23-24, D-18059 Rostock, Germany.
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Buddensiek D, Mlostoń G, Matczak P, Voss J. A DFT study on the mechanism of the formation of 1,4,2,3‐dithiadiazinanes by head‐to‐head [3 + 3] cyclodimerization of thiocarbonyl
S
‐imides. J PHYS ORG CHEM 2020. [DOI: 10.1002/poc.4170] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Dirk Buddensiek
- Department of Chemistry, University of Hamburg, Hamburg, Germany
| | | | | | - Jürgen Voss
- Department of Chemistry, University of Hamburg, Hamburg, Germany
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35
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Slatni I, Elberrichi FZ, Duplay J, Fardjaoui NEH, Guendouzi A, Guendouzi O, Gasmi B, Akbal F, Rekkab I. Mesoporous silica synthesized from natural local kaolin as an effective adsorbent for removing of Acid Red 337 and its application in the treatment of real industrial textile effluent. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:38422-38433. [PMID: 32385816 DOI: 10.1007/s11356-020-08615-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Accepted: 03/26/2020] [Indexed: 06/11/2023]
Abstract
This paper presents a synthesis of mesoporous silica (MS) from natural clay as a silica source using Pluronic L35 (EO11PO16EO11) as a structure-directing agent. The prepared material was characterized by XRD, X-ray fluorescence, thermogravimetric analysis, SEM, TEM, and N2 adsorption-desorption analyses. Then, mesoporous material was used for the removal of Acid Red 337 (AR337) from aqueous solution, and the treatment of real textile effluent. The effect of pH, contact time, weight of adsorbent, and initial concentration was studied in batch adsorption. The synthesized mesoporous material showed good discoloration efficiency with a 62% percentage. Experiment with real textile wastewater showed that 39%, 40%, and 31.5% of the color, TOC, and chemical oxygen demand respectively were eliminated by using 1 g of MS per liter of wastewater.
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Affiliation(s)
- Ibtissem Slatni
- Laboratoire de Chimie Physique, Université 8 Mai 1945, BP 401, Guelma, Algeria.
| | | | - Joëlle Duplay
- Laboratoire d'Hydrologie et de Géochimie de Strasbourg, EOST, 1 Rue Blessig, 67084, Strasbourg Cedex, France
| | | | - Abdelkrim Guendouzi
- Département de Chimie, Faculté des Sciences, Dr Moulay Tahar Université de Saida, Saida, Algeria
| | - Oukacha Guendouzi
- Département de Chimie, Faculté des Sciences, Dr Moulay Tahar Université de Saida, Saida, Algeria
| | - Brahim Gasmi
- Laboratoire de Physique des couches Minces et Applications, Université Mohamed Khider, Biskra, Algeria
| | - Feryal Akbal
- Department of Environmental Engineering, Ondokuz Mayıs Üniversitesi, Samsun, Turkey
| | - Ilhem Rekkab
- Laboratoire de Catalyse et Synthèse en Chimie Organique, Faculté des Sciences, Université de Tlemcen, Tlemcen, Algeria
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36
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Abdo YA, Tschumper GS. Competition between Solvent-Solvent and Solvent-Solute Interactions in the Microhydration of the Hexafluorophosphate Anion, PF 6-(H 2O) n=1,2. J Phys Chem A 2020; 124:8744-8752. [PMID: 32993285 DOI: 10.1021/acs.jpca.0c06466] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
This study systematically examines the interactions of the hexafluorophosphate anion (PF6-) with one or two solvent water molecules (PF6-(H2O)n where n = 1, 2). Full geometry optimizations and subsequent harmonic vibrational frequency computations are performed on each stationary point using a variety of common density functional theory methods (B3LYP, B3LYP-D3, M06-2X, and ωB97XD) and the MP2 and CCSD(T) ab initio methods with a triple-ζ correlation consistent basis set augmented with diffuse functions on all non-hydrogen atoms (cc-pVTZ for H and aug-cc-pVTZ for P, O, and F; denoted as haTZ). Five new stationary points of PF6-(H2O)2 have been identified, one of which has an electronic energy of approximately 2 kcal mol-1 lower than the only other dihydrate structure reported for this system. The CCSD(T) computations also reveal that the detailed interactions between PF6- and H2O can be quite difficult to model reliably, with some methods struggling to correctly characterize stationary points for n = 1 or accurately reproduce the vibrational frequency shifts induced by the formation of the hydrated complex. Although the interactions between the solvent and ionic solute are quite strong (CCSD(T) electronic dissociation energy ≈10 kcal mol-1 for the monohydrate minimum), the solvent-solvent interactions in the lowest-energy PF6-(H2O)2 minimum give rise to appreciable cooperative effects not observed in the other dihydrate minima. In addition, this newly identified structure exhibits the largest frequency shifts in the OH stretching vibrations for the waters of hydration (with Δω exceeding -100 cm-1 relative to the values for an isolated H2O molecule).
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Affiliation(s)
- Yasmeen A Abdo
- Department of Chemistry and Biochemistry, University of Mississippi, University, Mississippi 38677-1848, United States
| | - Gregory S Tschumper
- Department of Chemistry and Biochemistry, University of Mississippi, University, Mississippi 38677-1848, United States
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37
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Gizawy MA, El-Tahawy MMT, Motaleb MA. Radiosynthesis, molecular modeling and biodistribution of 99mTc-Protoporphyrin as a preclinical model for tumor diagnosis. J PORPHYR PHTHALOCYA 2020. [DOI: 10.1142/s1088424620500352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Porphyrins are among the most important and widely used compounds involved in a variety of chemical and biochemical applications. These molecules exhibit very special properties that encourage researchers to label many derivatives with diagnostic or therapeutic radionuclides for medical applications. This study reports the radiolabeling and biodistribution of [Formula: see text]Tc-protoporphyrin IX ([Formula: see text]Tc-PPIX) as a novel potential solid-tumor imaging agent. The factors affecting the radiolabeling process were varied to achieve maximum radiochemical yield. [Formula: see text]Tc-PPIX was obtained in high yield of 97.34 ± 0.21% and high stability in serum up to 24 h. The radiochemical yield of [Formula: see text]Tc-PPIX was assessed by a combination of a paper chromatographic technique and HPLC. A computational analysis for all the potential structures that may be formed due to the interaction between protoporphyrin IX and technetium was performed via the DFT method of calculations in gas phase to predict the most likely structure. Molecular docking was further employed to shed light on the nature of the interaction between the most stable complexes with the target protein. Finally, the in-vivo biodistribution of [Formula: see text]Tc-PPIX complex was evaluated in solid-tumor-bearing mice and high tumor/tissue ratio of 5.17 ± 0.34 at 60 min post injection was obtained. Our finding clearly suggests [Formula: see text]Tc-PPIX as a potential SPECT agent for tumor imaging.
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Affiliation(s)
- Mohamed A. Gizawy
- Labeled Compounds Department, Hot Labs Center, Atomic Energy Authority, P.O. Box 13759, Cairo, Egypt
- Radioisotopes Production Facility (RPF), Egyptian Second Research Reactor (ETRR-2), Atomic Energy Authority, P.O. Box 13759, Cairo, Egypt
| | | | - Mohamed A. Motaleb
- Labeled Compounds Department, Hot Labs Center, Atomic Energy Authority, P.O. Box 13759, Cairo, Egypt
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38
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Wang L, Wang Y. Exploring Reactivity and Regioselectivity of Dimerization of Paramagnetic Endohedral Metallofullerenes. Inorg Chem 2020; 59:10962-10975. [DOI: 10.1021/acs.inorgchem.0c01448] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Lihong Wang
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China
| | - Yang Wang
- School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu 225002, China
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39
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Perkins MA, Barlow KR, Dreux KM, Tschumper GS. Anchoring the hydrogen sulfide dimer potential energy surface to juxtapose (H2S)2 with (H2O)2. J Chem Phys 2020; 152:214306. [DOI: 10.1063/5.0008929] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Morgan A. Perkins
- Department of Chemistry and Biochemistry, University of Mississippi, University, Mississippi 38677-1848, USA
| | - Kayleigh R. Barlow
- Department of Chemistry and Biochemistry, University of Mississippi, University, Mississippi 38677-1848, USA
| | - Katelyn M. Dreux
- Department of Chemistry and Biochemistry, University of Mississippi, University, Mississippi 38677-1848, USA
| | - Gregory S. Tschumper
- Department of Chemistry and Biochemistry, University of Mississippi, University, Mississippi 38677-1848, USA
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40
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Muya JT, Isamura BK, Patouossa I, Nguyen MT. Interplay between σ Holes, Anion···H-C, and Cation-π Interactions in Dibromo[2,2]paracyclophane Complexes. J Phys Chem A 2020; 124:4379-4389. [PMID: 32364383 DOI: 10.1021/acs.jpca.9b09879] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Theoretical calculations were performed to investigate the interplay between σ-hole, anion-HC and cation-π interactions in the complexes of dibromo[2,2]paracyclophane (DBr[2,2]PCP) with alkali (Li+, Na+, K+), alkaline earth metal cations (Be2+, Mg2+, and Ca2+), and halogen anions (F-, Cl-, and Br-) using the wave function (MP2) and density functional theory (M06-2X and B3LYP) methods with the 6-311++G(d,p) basis set. The study reveals that DBr[2,2]PCP behaves as amphoteric molecule with a predominance of basic character. It prefers to interact with hard cations and hard anions such as Be2+ and F- through cation-π and anion···HC interactions, respectively. Substitution of Br by F and Cl atoms in DBr[2,2]PCP decreases slightly the interaction energies of DX[2,2]PCP-halogen complexes (X = F, Cl, and Br) by 2.0 and 0.3 kcal/mol (M06-2X), respectively. The anion-HC interactions in DBr[2,2]PCP complexes are ∼10 kcal/mol stronger (B3LYP; ∼15 kcal/mol at M06-2X and 7 kcal/mol at MP2) than the σ-hole interactions.
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Affiliation(s)
- Jules Tshishimbi Muya
- Research Center for Theoretical Chemistry and Physics in Central Africa, Faculty of Science, University of Kinshasa, Kinshasa, DR Congo.,Department of Chemistry, Faculty of Science, University of Kinshasa, P.O. Box 190 Kinshasa XI, DR Congo.,Department of Chemistry and Research Institute for Natural Science, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea
| | - Bienfait Kabuyaya Isamura
- Research Center for Theoretical Chemistry and Physics in Central Africa, Faculty of Science, University of Kinshasa, Kinshasa, DR Congo.,Department of Chemistry, Faculty of Science, University of Kinshasa, P.O. Box 190 Kinshasa XI, DR Congo
| | - Issofa Patouossa
- Research Center for Theoretical Chemistry and Physics in Central Africa, Faculty of Science, University of Kinshasa, Kinshasa, DR Congo.,Laboratory of Physical and Theoretical Chemistry, Faculty of Sciences, University of Yaoundé, P.O. Box 812, Yaoundé I, Cameroon
| | - Minh Tho Nguyen
- Computational Chemistry Research Group and Faculty of Applied Sciences, Ton Duc Thang University, Ho Chi Minh City 700000, Vietnam
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41
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42
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Kaczmarek-Kędziera A. Gas Phase Computational Study of Diclofenac Adsorption on Chitosan Materials. Molecules 2020; 25:molecules25112549. [PMID: 32486148 PMCID: PMC7321203 DOI: 10.3390/molecules25112549] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Revised: 05/23/2020] [Accepted: 05/27/2020] [Indexed: 02/07/2023] Open
Abstract
Environmental pollution with non-steroidal anti-inflammatory drugs and their metabolites exposes living organisms on their long-lasting, damaging influence. Hence, the ways of non-steroidal anti-inflammatory drugs (NSAIDs) removal from soils and wastewater is sought for. Among the potential adsorbents, biopolymers are employed for their good availability, biodegradability and low costs. The first available theoretical modeling study of the interactions of diclofenac with models of pristine chitosan and its modified chains is presented here. Supermolecular interaction energy in chitosan:drug complexes is compared with the the mutual attraction of the chitosan dimers. Supermolecular interaction energy for the chitosan-diclofenac complexes is significantly lower than the mutual interaction between two chitosan chains, suggesting that the diclofenac molecule will encounter problems when penetrating into the chitosan material. However, its surface adsorption is feasible due to a large number of hydrogen bond donors and acceptors both in biopolymer and in diclofenac. Modification of chitosan material introducing long-distanced amino groups significantly influences the intramolecular interactions within a single polymer chain, thus blocking the access of diclofenac to the biopolymer backbone. The strongest attraction between two chitosan chains with two long-distanced amino groups can exceed 120 kcal/mol, while the modified chitosan:diclofenac interaction remains of the order of 20 to 40 kcal/mol.
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Affiliation(s)
- Anna Kaczmarek-Kędziera
- Faculty of Chemistry, Nicolaus Copernicus University in Toruń, Gagarina 7, 87-100 Toruń, Poland
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43
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Pantaleone S, Salvini C, Zamirri L, Signorile M, Bonino F, Ugliengo P. A quantum mechanical study of dehydration vs. decarbonylation of formamide catalysed by amorphous silica surfaces. Phys Chem Chem Phys 2020; 22:8353-8363. [PMID: 32266913 DOI: 10.1039/d0cp00572j] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Formamide is abundant in the interstellar medium and was also present during the formation of the Solar system through the accretion process of interstellar dust. Under the physicochemical conditions of primordial Earth, formamide could have undergone decomposition, either via dehydration (HCN + H2O) or via decarbonylation (CO + NH3). The first reactive channel provides HCN, which is an essential molecular building block for the formation of RNA/DNA bases, crucial for the emergence of life on Earth. In this work, we studied, at the CCSD(T)/cc-pVTZ level, the two competitive routes of formamide decomposition, i.e. dehydration and decarbonylation, either in liquid formamide (by using the polarization continuum model technique) or at the interface between liquid formamide and amorphous silica. Amorphous silica was adopted as a convenient model of the crystalline silica phases ubiquitously present in the primordial (and actual) Earth's crust, and also due to its relevance in catalysis, adsorption and chromatography. Results show that: (i) silica surface sites catalyse both decomposition channels by reducing the activation barriers by about 100 kJ mol-1 with respect to the reactions in homogeneous medium, and (ii) the dehydration channel, giving rise to HCN, is strongly favoured from a kinetic standpoint over decarbonylation, the latter being, instead, slightly favoured from a thermodynamic point of view.
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Affiliation(s)
- Stefano Pantaleone
- Univ. Grenoble Alpes, CNRS, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG), 38000 Grenoble, France.
| | - Clara Salvini
- Dipartimento di Chimica and Nanostructured Interfaces and Surfaces (NIS) Centre, Università degli Studi di Torino, via P. Giuria 7, IT-10125, Torino, Italy.
| | - Lorenzo Zamirri
- Dipartimento di Chimica and Nanostructured Interfaces and Surfaces (NIS) Centre, Università degli Studi di Torino, via P. Giuria 7, IT-10125, Torino, Italy.
| | - Matteo Signorile
- Dipartimento di Chimica and Nanostructured Interfaces and Surfaces (NIS) Centre, Università degli Studi di Torino, via P. Giuria 7, IT-10125, Torino, Italy.
| | - Francesca Bonino
- Dipartimento di Chimica and Nanostructured Interfaces and Surfaces (NIS) Centre, Università degli Studi di Torino, via P. Giuria 7, IT-10125, Torino, Italy.
| | - Piero Ugliengo
- Dipartimento di Chimica and Nanostructured Interfaces and Surfaces (NIS) Centre, Università degli Studi di Torino, via P. Giuria 7, IT-10125, Torino, Italy.
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44
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Guendouzi O, Guendouzi A, Ouici HB, Brahim H, Boumediene M, Elkeurti M. A quantum chemical study of encapsulation and stabilization of gallic acid in β-cyclodextrin as a drug delivery system. CAN J CHEM 2020. [DOI: 10.1139/cjc-2019-0464] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
This research paper describes the study of the inclusion complex formation of a 1:1 stoichiometry ratio of host–guest inclusion complex (X-β-CD) between gallic acid (GA), which is reported to have anti-cancer effects, and β-cyclodextrin (β-CD). The use of β-CD for the encapsulation of bioactive compounds can protect the drugs against conjugation and metabolic inactivation and improve the aqueous solubility for increasing their capacity to functionalize the products. The objective of this study is to give insight on the mechanism of complexation and the capability of β-CD to encapsulate GA compound (X) in gas and solution phases. We examine and compare the performances of different quantum mechanical methods, namely HF/6-31G* and density functional theory (DFT; B97D3/6-31G* functional including dispersion correction), to study the importance of the contribution of the dispersion forces and the hydrogen bonding in the mechanism of interaction. The stability of the optimized geometries of the complex was evaluated with the supermolecule method. Two modes of complexation are taken into consideration. Moreover, the inclusion complex can be confirmed using the frontier molecular orbital (FMO) theory, the global indices of reactivity, the electronic populations condensed natural bond orbital (NBO) analysis, and the molecular docking, which examine the quality and the nature of the hydrophobic interactions during the complexation process.
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Affiliation(s)
- Oukacha Guendouzi
- Department of Physics, Faculty of Sciences, University of Saïda, Saïda, Algeria
- Laboratory of Chemistry, Synthesis, Properties and Applications, University of Saïda, Saïda, Algeria
| | - Abdelkrim Guendouzi
- Laboratory of Chemistry, Synthesis, Properties and Applications, University of Saïda, Saïda, Algeria
- Department of Chemistry, Faculty of Sciences, University of Saïda, Saïda, Algeria
- Laboratory of Applied Thermodynamics and Molecular Modeling, University of Tlemcen, Tlemcen, Algeria
| | - Houari Boumediene Ouici
- Laboratory of Chemistry, Synthesis, Properties and Applications, University of Saïda, Saïda, Algeria
- Department of Chemistry, Faculty of Sciences, University of Saïda, Saïda, Algeria
| | - Houari Brahim
- Laboratory of Chemistry, Synthesis, Properties and Applications, University of Saïda, Saïda, Algeria
- Department of Chemistry, Faculty of Sciences, University of Saïda, Saïda, Algeria
| | - Mostefa Boumediene
- Laboratory of Chemistry, Synthesis, Properties and Applications, University of Saïda, Saïda, Algeria
- Department of Chemistry, Faculty of Sciences, University of Saïda, Saïda, Algeria
| | - Mohammed Elkeurti
- Department of Physics, Faculty of Sciences, University of Saïda, Saïda, Algeria
- Laboratory of Physico-Chemical Studies, University of Saïda, Saïda, Algeria
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45
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Baghernejad M, Yang Y, Al-Owaedi OA, Aeschi Y, Zeng BF, Abd Dawood ZM, Li X, Liu J, Shi J, Decurtins S, Liu SX, Hong W, Lambert CJ. Constructive Quantum Interference in Single-Molecule Benzodichalcogenophene Junctions. Chemistry 2020; 26:5264-5269. [PMID: 32022327 DOI: 10.1002/chem.201905878] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2019] [Indexed: 11/11/2022]
Abstract
Heteroatom substitution into the cores of alternant, aromatic hydrocarbons containing only even-membered rings is attracting increasing interest as a method of tuning their electrical conductance. Here, the effect of heteroatom substitution into molecular cores of non-alternant hydrocarbons, containing odd-membered rings, is examined. Benzodichalcogenophene (BDC) compounds are rigid, planar π-conjugated structures, with molecular cores containing five-membered rings fused to a six-membered aryl ring. To probe the sensitivity or resilience of constructive quantum interference (CQI) in these non-bipartite molecular cores, two C2 -symmetric molecules (I and II) and one asymmetric molecule (III) were investigated. I (II) contains S (O) heteroatoms in each of the five-membered rings, while III contains an S in one five-membered ring and an O in the other. Differences in their conductances arise primarily from the longer S-C and shorter O-C bond lengths compared with the C-C bond and the associated changes in their resonance integrals. Although the conductance of III is significantly lower than the conductances of the others, CQI was found to be resilient and persist in all molecules.
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Affiliation(s)
- Masoud Baghernejad
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Pen-Tung Sah Institute of Micro-Nano Science and Technology, College of Chemistry and Chemical Engineering, iChEM, Xiamen University, 361005, Xiamen, China.,Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, 3012, Bern, Switzerland
| | - Yang Yang
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Pen-Tung Sah Institute of Micro-Nano Science and Technology, College of Chemistry and Chemical Engineering, iChEM, Xiamen University, 361005, Xiamen, China
| | - Oday A Al-Owaedi
- Department of Laser Physics, Women Faculty of Science, The University of Babylon, Hilla, 51001, Iraq
| | - Yves Aeschi
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, 3012, Bern, Switzerland
| | - Biao-Feng Zeng
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Pen-Tung Sah Institute of Micro-Nano Science and Technology, College of Chemistry and Chemical Engineering, iChEM, Xiamen University, 361005, Xiamen, China
| | - Zahra Murtada Abd Dawood
- Department of Laser Physics, Women Faculty of Science, The University of Babylon, Hilla, 51001, Iraq
| | - Xiaohui Li
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Pen-Tung Sah Institute of Micro-Nano Science and Technology, College of Chemistry and Chemical Engineering, iChEM, Xiamen University, 361005, Xiamen, China
| | - Junyang Liu
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Pen-Tung Sah Institute of Micro-Nano Science and Technology, College of Chemistry and Chemical Engineering, iChEM, Xiamen University, 361005, Xiamen, China
| | - Jia Shi
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Pen-Tung Sah Institute of Micro-Nano Science and Technology, College of Chemistry and Chemical Engineering, iChEM, Xiamen University, 361005, Xiamen, China
| | - Silvio Decurtins
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, 3012, Bern, Switzerland
| | - Shi-Xia Liu
- Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, 3012, Bern, Switzerland
| | - Wenjing Hong
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Pen-Tung Sah Institute of Micro-Nano Science and Technology, College of Chemistry and Chemical Engineering, iChEM, Xiamen University, 361005, Xiamen, China.,Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, 3012, Bern, Switzerland
| | - Colin J Lambert
- Department of Physics, University of Lancaster, Lancaster, LA1 4YB, UK), E-mail
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Development of quantitative structure-property relationship (QSPR) models for predicting the thermal hazard of ionic liquids: A review of methods and models. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112471] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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47
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Soltanabadi A, Bahrami M. Gas-phase electronic properties of tri-cationic imidazolium-based ionic liquids in comparison with mono- and di-cationic ionic liquids. J Mol Graph Model 2020; 96:107529. [PMID: 31918318 DOI: 10.1016/j.jmgm.2019.107529] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2019] [Revised: 12/28/2019] [Accepted: 12/28/2019] [Indexed: 10/25/2022]
Abstract
The optimized geometries, electronic structures, and gas-phase properties of widely applicable non-linear trigeminal tri-cationic ILs (TT-X3) were investigated using density functional theory (DFT) calculations and compared with mono- (M-X) and di-cationic (D-X2) ionic liquids. The studied ILs are based on the imidazolium cation containing halide (X‾) anions, where X‾ = Cl‾, Br‾ and I‾. Inter-molecular hydrogen bonds were studied by atoms in molecules (AIM) and natural bond orbital (NBO) analyses. Accordingly the most significant cation-anion charge transfer is related to C1-H1 … X (X = Cl, Br, I) interaction which strongly occurs in TT-X3 ILs and especially in TT-Cl3. Among ILs under investigation, TT-Cl3 has the strongest cation-anion interaction. Also M - I IL has the largest and D-Cl2 has the smallest electrical dipole moment.
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Affiliation(s)
- Azim Soltanabadi
- Department of Physical Chemistry, Faculty of Chemistry, Razi University, Kermanshahm, Iran.
| | - Maryam Bahrami
- Department of Chemistry, Shiraz University, Shiraz, 71946, Iran.
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Valiev RR, Valiulina LI, Fliegl H, Sundholm D. The effect of anion complexation on the aromatic properties of aromatic and antiaromatic porphyrinoids. NEW J CHEM 2020. [DOI: 10.1039/d0nj04470a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The effect of anion complexation on magnetically induced current densities and excitation energies of antiaromatic molecular rings has been investigated by calculations on expanded antiaromatic porphyrinoids including orangarin, rosarin, amethyrin and on a theoretically predicted strongly antiaromatic hydrocarbon ring.
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Affiliation(s)
- Rashid R. Valiev
- Department of Chemistry
- Faculty of Science
- University of Helsinki
- Helsinki FIN-00014
- Finland
| | | | - Heike Fliegl
- Karlsruhe Institute of Technology (KIT)
- Institute of Nanotechnology
- Eggenstein-Leopoldshafen
- Germany
| | - Dage Sundholm
- Department of Chemistry
- Faculty of Science
- University of Helsinki
- Helsinki FIN-00014
- Finland
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49
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Nunzi F, Di Erasmo B, Tarantelli F, Cappelletti D, Pirani F. The Halogen-Bond Nature in Noble Gas-Dihalogen Complexes from Scattering Experiments and Ab Initio Calculations. Molecules 2019; 24:molecules24234274. [PMID: 31771210 PMCID: PMC6930525 DOI: 10.3390/molecules24234274] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Revised: 11/21/2019] [Accepted: 11/21/2019] [Indexed: 11/16/2022] Open
Abstract
In order to clarify the nature of the halogen bond (XB), we considered the prototype noble gas–dihalogen molecule (Ng–X2) systems, focusing on the nature, range, and strength of the interaction. We exploited data gained from molecular beam scattering experiments with the measure of interference effects to obtain a suitable formulation of the interaction potential, with the support of high-level ab initio calculations, and charge displacement analysis. The essential interaction components involved in the Ng–X2 adducts were characterized, pointing at their critical balance in the definition of the XB. Particular emphasis is devoted to the energy stability of the orientational Ng–X2 isomers, the barrier for the X2 hindered rotation, and the influence of the X2 electronic state. The present integrated study returns reliable force fields for molecular dynamic simulations in Ng–X2 complexes that can be extended to systems with increasing complexity and whose properties depend on the selective formation of XB.
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Affiliation(s)
- Francesca Nunzi
- Dipartimento di Chimica, Biologia e Biotecnologie, via Elce di Sotto 8, I-06123 Perugia, Italy; (B.D.E.); (F.T.); (D.C.)
- Istituto CNR di Scienze e Tecnologie Chimiche “Giulio Natta” (CNR-SCITEC), via Elce di Sotto, I-06123 Perugia, Italy
- Correspondence: (F.N.); (F.P.)
| | - Benedetta Di Erasmo
- Dipartimento di Chimica, Biologia e Biotecnologie, via Elce di Sotto 8, I-06123 Perugia, Italy; (B.D.E.); (F.T.); (D.C.)
| | - Francesco Tarantelli
- Dipartimento di Chimica, Biologia e Biotecnologie, via Elce di Sotto 8, I-06123 Perugia, Italy; (B.D.E.); (F.T.); (D.C.)
- Istituto CNR di Scienze e Tecnologie Chimiche “Giulio Natta” (CNR-SCITEC), via Elce di Sotto, I-06123 Perugia, Italy
| | - David Cappelletti
- Dipartimento di Chimica, Biologia e Biotecnologie, via Elce di Sotto 8, I-06123 Perugia, Italy; (B.D.E.); (F.T.); (D.C.)
| | - Fernando Pirani
- Dipartimento di Chimica, Biologia e Biotecnologie, via Elce di Sotto 8, I-06123 Perugia, Italy; (B.D.E.); (F.T.); (D.C.)
- Correspondence: (F.N.); (F.P.)
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50
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Hazra A, van Heerden DP, Sanyal S, Lama P, Esterhuysen C, Barbour LJ. CO 2-induced single-crystal to single-crystal transformations of an interpenetrated flexible MOF explained by in situ crystallographic analysis and molecular modeling. Chem Sci 2019; 10:10018-10024. [PMID: 32015814 PMCID: PMC6977545 DOI: 10.1039/c9sc04043a] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Accepted: 09/06/2019] [Indexed: 12/24/2022] Open
Abstract
A molecular-level investigation is reported on breathing behaviour of a metal-organic framework (1) in response to CO2 gas pressure. High-pressure gas adsorption shows a pronounced step corresponding to a gate-opening phase transformation from a closed (1cp ) to a large-pore (1lp ) form. A plateau is observed upon desorption corresponding to narrow-pore intermediate form 1np which does not occur during adsorption. These events are corroborated by pressure-gradient differential scanning calorimetry and in situ single-crystal X-ray diffraction analysis under controlled CO2 gas pressure. Complete crystallographic characterisation facilitated a rationalisation of each phase transformation in the series 1cp → 1lp → 1np → 1cp during adsorption and subsequent desorption. Metropolis grand-canonical Monte Carlo simulations and DFT-PBE-D3 interaction energy calculations strongly underpin this first detailed structural investigation of an intermediate phase encountered upon desorption.
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Affiliation(s)
- Arpan Hazra
- Department of Chemistry and Polymer Science , University of Stellenbosch , Matieland , 7600 , South Africa .
| | - Dewald P van Heerden
- Department of Chemistry and Polymer Science , University of Stellenbosch , Matieland , 7600 , South Africa .
| | - Somananda Sanyal
- Department of Chemistry and Polymer Science , University of Stellenbosch , Matieland , 7600 , South Africa .
| | - Prem Lama
- Department of Chemistry and Polymer Science , University of Stellenbosch , Matieland , 7600 , South Africa .
| | - Catharine Esterhuysen
- Department of Chemistry and Polymer Science , University of Stellenbosch , Matieland , 7600 , South Africa .
| | - Leonard J Barbour
- Department of Chemistry and Polymer Science , University of Stellenbosch , Matieland , 7600 , South Africa .
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