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Grillo DA, Albano JMR, Valladares T. RE, Mocskos EE, Facelli JC, Pickholz M, Ferraro MB. Molecular dynamics study of the mechanical properties of drug loaded model systems: A comparison of a polymersome with a bilayer. J Chem Phys 2023; 159:174908. [PMID: 37929867 PMCID: PMC10629967 DOI: 10.1063/5.0165478] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2023] [Accepted: 10/16/2023] [Indexed: 11/07/2023] Open
Abstract
In this work we implement a new methodology to study structural and mechanical properties of systems having spherical and planar symmetries throughout Molecular Dynamics simulations. This methodology is applied here to a drug delivery system based in polymersomes, as an example. The chosen model drug was the local anesthetic prilocaine due to previous parameterization within the used coarse grain scheme. In our approach, mass density profiles (MDPs) are used to obtain key structural parameters of the systems, and pressure profiles are used to estimate the curvature elastic parameters. The calculation of pressure profiles and radial MPDs required the development of specific methods, which were implemented in an in-house built version of the GROMACS 2018 code. The methodology presented in this work is applied to characterize poly(ethylene oxide)-poly(butadiene) polymersomes and bilayers loaded with the model drug prilocaine. Our results show that structural properties of the polymersome membrane could be obtained from bilayer simulations, with significantly lower computational cost compared to whole polymersome simulations, but the bilayer simulations are insufficient to get insights on their mechanical aspects, since the elastic parameters are canceled out for the complete bilayer (as consequence of the symmetry). The simulations of entire polymersomes, although more complex, offer a complementary approach to get insights on the mechanical behavior of the systems.
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Affiliation(s)
| | - Juan M. R. Albano
- CONICET - Universidad de Buenos Aires, Instituto de Física de Buenos Aires (IFIBA), Buenos Aires, Argentina
| | - Rufino E. Valladares T.
- Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Departamento de Física, Buenos Aires, Argentina
| | | | - Julio C. Facelli
- Department of Biomedical Informatics, University of Utah, 421 Wakara Way, Suite 140, Salt Lake City, Utah 84108, USA
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Pagola GI, Provasi PF, Ferraro MB, Lazzeretti P. On the axial chirality of leucoindigo. J Comput Chem 2023; 44:1578-1586. [PMID: 37026434 DOI: 10.1002/jcc.27109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2023] [Revised: 03/02/2023] [Accepted: 03/14/2023] [Indexed: 04/08/2023]
Abstract
The diagonal components and the trace of two tensors which account for chiroptical response of the leucoindigo molecule C 16 H 12 N 2 O 2 $$ {\mathrm{C}}_{16}{\mathrm{H}}_{12}{\mathrm{N}}_2{\mathrm{O}}_2 $$ that is, static anapole magnetizability, and dynamic electric dipole-magnetic dipole polarisability depending on the frequency of impinging light, are a function of the ϕ $$ \phi $$ dihedral angle of torsion about the central CC bond, assumed to lie in the y $$ y $$ direction of the coordinate system. They vanish for symmetry reasons at ϕ = 0 ∘ $$ \phi ={0}^{\circ } $$ and ϕ = 180 ∘ $$ \phi ={180}^{\circ } $$ , corresponding respectively to C 2 v $$ {C}_{2v} $$ and C 2 h $$ {C}_{2h} $$ point group symmetries, that is, cis and trans conformers characterized by the presence of molecular symmetry planes. Nonetheless, diagonal components and average value of static anapole polarizability and optical rotation tensors vanish at ϕ = 90 ∘ $$ \phi ={90}^{\circ } $$ , where leucondigo is unquestionably chiral from the geometrical viewpoint. Vanishing values of the average chiroptical properties have been observed also in the proximity of other ϕ $$ \phi $$ angles. Attempts have been made to explain the occurrence of accidental zeros of chiroptical properties in terms of transition frequencies and scalar products appearing in the numerator of their quantum mechanical definitions. Within the electric dipole approximation, the presence of anomalous vanishing values of tensor components of anapole magnetizability and electric-magnetic dipole polarizability is ascribed to physical achirality, arising from the lack of either toroidal or spiral electron flow along the x $$ x $$ , y $$ y $$ and z $$ z $$ directions.
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Affiliation(s)
- G I Pagola
- Departamento de Fisica, Facultad de Ciencias Exactas y Naturales and IFIBA, CONICET, Universidad de Buenos Aires, Ciudad Universitaria, Pab. I, (1428), Buenos Aires, Argentina
| | - P F Provasi
- Department of Physics, University of Northeast, IMIT - CONICET, Av. Libertad 5500, Corrientes, W3404AAS, Argentina
| | - M B Ferraro
- Departamento de Fisica, Facultad de Ciencias Exactas y Naturales and IFIBA, CONICET, Universidad de Buenos Aires, Ciudad Universitaria, Pab. I, (1428), Buenos Aires, Argentina
| | - P Lazzeretti
- Dipartimento di Chimica e Biologia "A. Zambelli", Università degli Studi di Salerno, via Giovanni Paolo II 132, Fisciano, 84084, Italy
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Pagola GI, Ferraro MB, Provasi PF, Pelloni S, Lazzeretti P. Physical achirality in geometrically chiral rotamers of hydrazine and boranylborane molecules. J Comput Chem 2021; 42:1772-1782. [PMID: 34235753 DOI: 10.1002/jcc.26709] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 06/09/2021] [Accepted: 06/15/2021] [Indexed: 11/11/2022]
Abstract
The diagonal components and the trace of tensors which account for chiroptical response of the hydrazine molecule N2 H4 , that is, static anapole magnetizability and frequency-dependent electric dipole-magnetic dipole polarisability, are a function of the ϕ ≡ ∠ H─N─N─H dihedral angle. They vanish for symmetry reasons at ϕ = 0° and ϕ = 180°, corresponding respectively to C2v and C2h point group symmetries, that is, cis and trans conformers characterized by the presence of molecular symmetry planes. Nonetheless, vanishing diagonal components have been observed also in the proximity of ∠ H─N─N─H = 90°, in which the point group symmetry is C2 and hydrazine is unquestionably chiral. In the boranylborane molecule B2 H4 , assuming the B─B bond in the y direction, the ayy component of the anapole magnetizability tensor approximately vanishes for dihedral angles ∠ H─B─B─H corresponding to chiral rotamers which belong to D2 symmetry. Such anomalous effects have been ascribed to physical achirality of these conformers, that is, to their inability to sustain electronic current densities inducing either anapole moments, or electric and magnetic dipole moments, about the chiral axis connecting heavier atoms, as well as perpendicular directions. In other terms, the structure of certain geometrically chiral rotamers may be such that neither toroidal nor helical flow, which determine chiroptical phenomenology, can take place in the presence of perturbing fields parallel or orthogonal to the chiral axis.
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Affiliation(s)
- Gabriel I Pagola
- Departamento de Física, Facultad de Ciencias Exactas y Naturales and IFIBA, CONICET, Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires, Argentina
| | - Marta B Ferraro
- Departamento de Física, Facultad de Ciencias Exactas y Naturales and IFIBA, CONICET, Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires, Argentina
| | - Patricio F Provasi
- Department of Physics, University of Northeast, IMIT - CONICET, Corrientes, Argentina
| | - Stefano Pelloni
- Istituto d'Istruzione Superiore Francesco Selmi, Modena, Italy
| | - Paolo Lazzeretti
- Dipartimento di Chimica e Biologia "A. Zambelli", Università degli Studi di Salerno, Fisciano, Italy
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Galeano Carrano RS, Provasi PF, Ferraro MB, Alkorta I, Elguero J, Sauer SPA. A Density Functional Theory Study of Optical Rotation in Some Aziridine and Oxirane Derivatives. Chemphyschem 2021; 22:764-774. [PMID: 33528071 DOI: 10.1002/cphc.202001010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Revised: 02/01/2021] [Indexed: 12/25/2022]
Abstract
We present time-dependent density functional theory (TDDFT) calculations of the electronic optical rotation (ORP) for seven oxirane and two aziridine derivatives in the gas phase and in solution and compare the results with the available experimental values. For seven of the studied molecules it is the first time that their optical rotation was studied theoretically and we have therefore investigated the influence of several settings in the TDDFT calculations on the results. This includes the choice of the one-electron basis set, the exchange-correlation functional or the particular polarizable continuum model (PCM). We can confirm that polarized quadruple zeta basis sets augmented with diffuse functions are necessary for converged results and find that the aug-pc-3 basis set is a viable alternative to the frequently employed aug-cc-pVQZ basis set. Based on our study, we cannot recommend the generalized gradient functional KT3 for calculations of the ORP in these compounds, whereas the hybrid functional PBE0 gives results quite similar to the long-range correct CAM-B3LYP functional. Finally, we observe large differences in the solvent effects predicted by the integral equation formalism of PCM and the SMD variant of PCM. For the majority of solute/solvent combinations in this study, we find that the SMD model in combination with the PBE0 functional and the aug-pc-3 basis set gives the best agreement with the experimental values.
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Affiliation(s)
- Ramiro S Galeano Carrano
- Facultad de Ciencias Exactas, Químicas y Naturales, Universidad Nacional de Misiones, Posadas, Argentina
| | - Patricio F Provasi
- Department of Physics, IMIT, Northeastern University, CONICET, Corrientes, Argentina
| | - Marta B Ferraro
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires and IFIBA, CONICET, Buenos Aires, Argentina
| | - Ibon Alkorta
- Instituto de Química Médica (C.S.I.C.), Madrid, Spain
| | - José Elguero
- Instituto de Química Médica (C.S.I.C.), Madrid, Spain
| | - Stephan P A Sauer
- Department of Chemistry, University of Copenhagen, Copenhagen, Denmark
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Albano JMR, Facelli JC, Ferraro MB, Pickholz M. Magnesium interactions with a CX26 connexon in lipid bilayers. J Mol Model 2019; 25:232. [PMID: 31327057 DOI: 10.1007/s00894-019-4121-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2019] [Accepted: 07/04/2019] [Indexed: 01/15/2023]
Abstract
Following our previous work, where we described the interaction of calcium with the Cx26 hemichannel, we further explore the same system by atomistic molecular dynamics simulations considering a different di-cation, magnesium. Specifically, the interaction of magnesium di-cation with the previously reported calcium binding sites (ASP2, ASP117, ASP159, GLU114, GLU119, GLU120, and VAL226) was investigated to identify similarities and differences between them. In order to do so, four extensive simulations were carried out. Two of them considered a Cx26 hemichannel embedded on a POPC bilayer with one of the di-cations and a sodium-chlorine solution. For the remaining two, no di-cations were included and a sodium-chlorine or potassium-chlorine solution was considered. Potassium has a similar atomic mass to calcium, and sodium to magnesium, but they both differ in charge (1e and 2e respectively). Magnesium and calcium, even having the same charge, showed different affinity for the explored protein. From the calcium binding sites referred above, we found that the magnesium di-cations only binds strongly to the GLU114 site of one connexin. For the sodium and potassium simulations, no specific interactions with the protein were found. Altogether, these results suggest that mass and steric effects play an important role in determining cation binding to Cx26 hemichannels.
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Affiliation(s)
- Juan M R Albano
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires and IFIBA, CONICET, Ciudad Universitaria, Pabellón 1, 1428, Buenos Aires, Argentina.,Instituto de Física de Buenos Aires (IFIBA), CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Julio C Facelli
- Department of Biomedical Informatics, University of Utah, 421 Wakara Way, Suite 140, Salt Lake City, UT, 84108, USA
| | - Marta B Ferraro
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires and IFIBA, CONICET, Ciudad Universitaria, Pabellón 1, 1428, Buenos Aires, Argentina. .,Instituto de Física de Buenos Aires (IFIBA), CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina.
| | - Monica Pickholz
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires and IFIBA, CONICET, Ciudad Universitaria, Pabellón 1, 1428, Buenos Aires, Argentina.,Instituto de Física de Buenos Aires (IFIBA), CONICET-Universidad de Buenos Aires, Buenos Aires, Argentina
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Albano JMR, Mussini N, Toriano R, Facelli JC, Ferraro MB, Pickholz M. Calcium interactions with Cx26 hemmichannel: Spatial association between MD simulations biding sites and variant pathogenicity. Comput Biol Chem 2018; 77:331-342. [PMID: 30466042 DOI: 10.1016/j.compbiolchem.2018.11.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2018] [Revised: 07/08/2018] [Accepted: 11/08/2018] [Indexed: 01/23/2023]
Abstract
Connexinophaties are a collective of diseases related to connexin channels and hemichannels. In particular many Cx26 alterations are strongly associated to human deafness. Calcium plays an important role on this structures regulation. Here, using calcium as a probe, extensive atomistic Molecular Dynamics simulations were performed on the Cx26 hemichannel embedded in a lipid bilayer. Exploring different initial conditions and calcium concentration, simulation reached ∼4 μs. Several analysis were carried out in order to reveal the calcium distribution and localization, such as electron density profiles, density maps and distance time evolution, which is directly associated to the interaction energy. Specific amino acid interactions with calcium and their stability were capture within this context. Few of these sites such as, GLU42, GLU47, GLY45 and ASP50, were already suggested in the literature. Besides, we identified novel calcium biding sites: ASP2, ASP117, ASP159, GLU114, GLU119, GLU120 and VAL226. To the best of our knowledge, this is the first time that these sites are reported within this context. Furthermore, since various pathologies involving the Cx26 hemichannel are associated with pathogenic variants in the corresponding CJB2 gene, using ClinVar, we were able to spatially associate the 3D positions of the identified calcium binding sites within the framework of this work with reported pathogenic variants in the CJB2 gene. This study presents a first step on finding associations between molecular features and pathological variants of the Cx26 hemichannel.
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Affiliation(s)
- Juan M R Albano
- Facultad de Ciencias Exactas y Naturales, Departamento de Física, Universidad de Buenos Aires, Argentina; CONICET- Universidad de Buenos Aires, IFIBA, Buenos Aires, Argentina
| | - Nahuel Mussini
- Facultad de Ciencias Exactas y Naturales, Departamento de Física, Universidad de Buenos Aires, Argentina; CONICET- Universidad de Buenos Aires, IFIBA, Buenos Aires, Argentina
| | - Roxana Toriano
- Facultad de Medicina, Departamento de Ciencias Fisiológicas, Laboratorio de Biomembranas, Buenos Aires, Argentina; CONICET - Universidad de Buenos Aires, IFIBIO Houssay, Buenos Aires, Argentina
| | - Julio C Facelli
- Department of Biomedical Informatics, The University of Utah, 421 Wakara Way, Suite 140, Salt Lake City, UT 84108, USA.
| | - Marta B Ferraro
- Facultad de Ciencias Exactas y Naturales, Departamento de Física, Universidad de Buenos Aires, Argentina; CONICET- Universidad de Buenos Aires, IFIBA, Buenos Aires, Argentina
| | - Mónica Pickholz
- Facultad de Ciencias Exactas y Naturales, Departamento de Física, Universidad de Buenos Aires, Argentina; CONICET- Universidad de Buenos Aires, IFIBA, Buenos Aires, Argentina
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Grillo DA, Albano JMR, Mocskos EE, Facelli JC, Pickholz M, Ferraro MB. Diblock copolymer bilayers as model for polymersomes: A coarse grain approach. J Chem Phys 2018; 146:244904. [PMID: 28668049 DOI: 10.1063/1.4986642] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
This paper presents a new model for polymersomes developed using a poly(ethylene oxide)-poly(butadiene) diblock copolymer bilayer. The model is based on a coarse-grained approach using the MARTINI force field. Since no MARTINI parameters exist for poly(butadiene), we have refined these parameters using quantum mechanical calculations and molecular dynamics simulations. The model has been validated using extensive molecular dynamics simulations in systems with several hundred polymer units and reaching up to 6 μs. These simulations show that the copolymer coarse grain model self-assemble into bilayers and that NPT and NPNγT ensemble runs reproduce key structural and mechanical experimental properties for different copolymer length chains with a similar hydrophilic weight fraction.
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Affiliation(s)
- Damián A Grillo
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Juan M R Albano
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Esteban E Mocskos
- Departamento de Computación, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Julio C Facelli
- Department of Biomedical Informatics, University of Utah, 421 Wakara Way, Suite 140, Salt Lake City, Utah 84108, USA
| | - Mónica Pickholz
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Marta B Ferraro
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
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Grillo DA, Albano JMR, Mocskos EE, Facelli JC, Pickholz M, Ferraro MB. Mechanical properties of drug loaded diblock copolymer bilayers: A molecular dynamics study. J Chem Phys 2018; 148:214901. [PMID: 29884038 DOI: 10.1063/1.5028377] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In this work, we present results of coarse-grained simulations to study the encapsulation of prilocaine (PLC), both neutral and protonated, on copolymer bilayers through molecular dynamics simulations. Using a previously validated membrane model, we have simulated loaded bilayers at different drug concentrations and at low (protonated PLC) and high (neutral PLC) pH levels. We have characterized key structural parameters of the loaded bilayers in order to understand the effects of encapsulation of PLC on the bilayer structure and mechanical properties. Neutral PLC was encapsulated in the hydrophobic region leading to a thickness increase, while the protonated species partitioned between the water phase and the poly(ethylene oxide)-poly(butadiene) (PBD) interface, relaxing the PBD region and leading to a decrease in the thickness. The tangential pressures of the studied systems were calculated, and their components were decomposed in order to gain insights on their compensation. In all cases, it is observed that the loading of the membrane does not significantly decrease the stability of the bilayer, indicating that the system could be used for drug delivery.
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Affiliation(s)
- Damián A Grillo
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Juan M R Albano
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Esteban E Mocskos
- Departamento de Computación, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Julio C Facelli
- Department of Biomedical Informatics, University of Utah, 421 Wakara Way, Suite 140, Salt Lake City, Utah 84108, USA
| | - Mónica Pickholz
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
| | - Marta B Ferraro
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
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Pelloni S, Provasi PF, Pagola GI, Ferraro MB, Lazzeretti P. Electric Dipole-Magnetic Dipole Polarizability and Anapole Magnetizability of Hydrogen Peroxide as Functions of the HOOH Dihedral Angle. J Phys Chem A 2017; 121:9369-9376. [PMID: 29131953 DOI: 10.1021/acs.jpca.7b09104] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The trace of tensors that account for chiroptical response of the H2O2 molecule is a function of the HO-OH dihedral angle. It vanishes at 0° and 180°, due to the presence of molecular symmetry planes, but also for values in the range 90-100° of this angle, in which the molecule is unquestionably chiral. Such an atypical effect is caused by counterbalancing contributions of diagonal tensor components with nearly maximal magnitude but opposite sign, determined by electron flow in open or closed helical paths, and associated with induced electric and magnetic dipole moments and anapole moments. For values of dihedral angle external to the 90-100° interval, the helical paths become smaller in size, thus reducing the amount of cancellation among diagonal components. Shrinking of helical paths determines the appearance of extremum values of tensor traces approximately at 50° and 140° dihedral angles.
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Affiliation(s)
- S Pelloni
- Polo agroindustriale di Parma c/o I.T.I.S. Galileo Galilei , Via Martiri di Cefalonia 14, S. Secondo, 43126 Parma, Italy
| | - P F Provasi
- Departamento de Fı́sica, Northeastern University , Av. Libertad 5500, W3400 AAS Corrientes, Argentina
| | - G I Pagola
- Departamento de Fı́sica, Facultad de Ciencias Exactas y Naturales and IFIBA, CONICET, Universidad de Buenos Aires, Ciudad Universitaria , Pab. I, 1428 Buenos Aires, Argentina
| | - M B Ferraro
- Departamento de Fı́sica, Facultad de Ciencias Exactas y Naturales and IFIBA, CONICET, Universidad de Buenos Aires, Ciudad Universitaria , Pab. I, 1428 Buenos Aires, Argentina
| | - P Lazzeretti
- Istituto di Struttura della Materia, Consiglio Nazionale delle Ricerche , Via del Fosso del Cavaliere 100, 00133 Roma, Italy
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Reilly AM, Cooper RI, Adjiman CS, Bhattacharya S, Boese AD, Brandenburg JG, Bygrave PJ, Bylsma R, Campbell JE, Car R, Case DH, Chadha R, Cole JC, Cosburn K, Cuppen HM, Curtis F, Day GM, DiStasio Jr RA, Dzyabchenko A, van Eijck BP, Elking DM, van den Ende JA, Facelli JC, Ferraro MB, Fusti-Molnar L, Gatsiou CA, Gee TS, de Gelder R, Ghiringhelli LM, Goto H, Grimme S, Guo R, Hofmann DWM, Hoja J, Hylton RK, Iuzzolino L, Jankiewicz W, de Jong DT, Kendrick J, de Klerk NJJ, Ko HY, Kuleshova LN, Li X, Lohani S, Leusen FJJ, Lund AM, Lv J, Ma Y, Marom N, Masunov AE, McCabe P, McMahon DP, Meekes H, Metz MP, Misquitta AJ, Mohamed S, Monserrat B, Needs RJ, Neumann MA, Nyman J, Obata S, Oberhofer H, Oganov AR, Orendt AM, Pagola GI, Pantelides CC, Pickard CJ, Podeszwa R, Price LS, Price SL, Pulido A, Read MG, Reuter K, Schneider E, Schober C, Shields GP, Singh P, Sugden IJ, Szalewicz K, Taylor CR, Tkatchenko A, Tuckerman ME, Vacarro F, Vasileiadis M, Vazquez-Mayagoitia A, Vogt L, Wang Y, Watson RE, de Wijs GA, Yang J, Zhu Q, Groom CR. Report on the sixth blind test of organic crystal structure prediction methods. Acta Crystallogr B Struct Sci Cryst Eng Mater 2016; 72:439-59. [PMID: 27484368 PMCID: PMC4971545 DOI: 10.1107/s2052520616007447] [Citation(s) in RCA: 294] [Impact Index Per Article: 36.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2016] [Accepted: 05/04/2016] [Indexed: 05/05/2023]
Abstract
The sixth blind test of organic crystal structure prediction (CSP) methods has been held, with five target systems: a small nearly rigid molecule, a polymorphic former drug candidate, a chloride salt hydrate, a co-crystal and a bulky flexible molecule. This blind test has seen substantial growth in the number of participants, with the broad range of prediction methods giving a unique insight into the state of the art in the field. Significant progress has been seen in treating flexible molecules, usage of hierarchical approaches to ranking structures, the application of density-functional approximations, and the establishment of new workflows and `best practices' for performing CSP calculations. All of the targets, apart from a single potentially disordered Z' = 2 polymorph of the drug candidate, were predicted by at least one submission. Despite many remaining challenges, it is clear that CSP methods are becoming more applicable to a wider range of real systems, including salts, hydrates and larger flexible molecules. The results also highlight the potential for CSP calculations to complement and augment experimental studies of organic solid forms.
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Affiliation(s)
- Anthony M. Reilly
- The Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, England
| | - Richard I. Cooper
- Chemical Crystallography, Chemistry Research Laboratory, Mansfield Road, Oxford OX1 3TA, England
| | - Claire S. Adjiman
- Department of Chemical Engineering, Centre for Process Systems Engineering, Imperial College London, London SW7 2AZ, England
| | - Saswata Bhattacharya
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195, Berlin, Germany
| | - A. Daniel Boese
- Department of Chemistry, Institute of Physical and Theoretical Chemistry, University of Graz, Heinrichstraße 28/IV, 8010 Graz, Austria
| | - Jan Gerit Brandenburg
- Mulliken Center for Theoretical Chemistry, Institut für Physikalische und Theoretische Chemie, Rheinische Friedrich-Wilhelms Universität Bonn, Beringstraße 4, 53115 Bonn, Germany
| | - Peter J. Bygrave
- School of Chemistry, University of Southampton, Southampton SO17 1BJ, England
| | - Rita Bylsma
- Radboud University, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - Josh E. Campbell
- School of Chemistry, University of Southampton, Southampton SO17 1BJ, England
| | - Roberto Car
- Department of Chemistry, Princeton University, Princeton, NJ 08544, USA
| | - David H. Case
- School of Chemistry, University of Southampton, Southampton SO17 1BJ, England
| | - Renu Chadha
- University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh, India
| | - Jason C. Cole
- The Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, England
| | - Katherine Cosburn
- Department of Physics and Engineering Physics, Tulane University, New Orleans, LA 70118, USA
- Department of Physics, University of Toronto, Toronto, Canada M5S 1A7
| | - Herma M. Cuppen
- Radboud University, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - Farren Curtis
- Department of Physics and Engineering Physics, Tulane University, New Orleans, LA 70118, USA
- Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA
| | - Graeme M. Day
- School of Chemistry, University of Southampton, Southampton SO17 1BJ, England
| | - Robert A. DiStasio Jr
- Department of Chemistry, Princeton University, Princeton, NJ 08544, USA
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, NY 14853, USA
| | | | | | - Dennis M. Elking
- OpenEye Scientific Software, 9 Bisbee Court, Suite D, Santa Fe, NM 87508, USA
| | - Joost A. van den Ende
- Radboud University, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - Julio C. Facelli
- Center for High Performance Computing, University of Utah, 155 South 1452 East Room 405, Salt Lake City, UT 84112-0190, USA
- Department of Biomedical Informatics, University of Utah, 155 South 1452 East Room 405, Salt Lake City, UT 84112-0190, USA
| | - Marta B. Ferraro
- Departamento de Física and Ifiba (CONICET) Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. I (1428), Buenos Aires, Argentina
| | - Laszlo Fusti-Molnar
- OpenEye Scientific Software, 9 Bisbee Court, Suite D, Santa Fe, NM 87508, USA
| | - Christina-Anna Gatsiou
- Department of Chemical Engineering, Centre for Process Systems Engineering, Imperial College London, London SW7 2AZ, England
| | - Thomas S. Gee
- School of Chemistry, University of Southampton, Southampton SO17 1BJ, England
| | - René de Gelder
- Radboud University, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - Luca M. Ghiringhelli
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195, Berlin, Germany
| | - Hitoshi Goto
- Educational Programs on Advanced Simulation Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan
- Department of Computer Science and Engineering, Graduate School of Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan
| | - Stefan Grimme
- Mulliken Center for Theoretical Chemistry, Institut für Physikalische und Theoretische Chemie, Rheinische Friedrich-Wilhelms Universität Bonn, Beringstraße 4, 53115 Bonn, Germany
| | - Rui Guo
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, England
| | - Detlef W. M. Hofmann
- CRS4, Parco Scientifico e Tecnologico, POLARIS, Edificio 1, 09010 PULA, Italy
- FlexCryst, Schleifweg 23, 91080 Uttenreuth, Germany
| | - Johannes Hoja
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195, Berlin, Germany
| | - Rebecca K. Hylton
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, England
| | - Luca Iuzzolino
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, England
| | - Wojciech Jankiewicz
- Institute of Chemistry, University of Silesia, Szkolna 9, 40-006 Katowice, Poland
| | - Daniël T. de Jong
- Radboud University, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - John Kendrick
- Faculty of Life Sciences, University of Bradford, Richmond Road, Bradford BD7 1DP, England
| | - Niek J. J. de Klerk
- Radboud University, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - Hsin-Yu Ko
- Department of Chemistry, Princeton University, Princeton, NJ 08544, USA
| | | | - Xiayue Li
- Department of Physics and Engineering Physics, Tulane University, New Orleans, LA 70118, USA
- Argonne Leadership Computing Facility, Argonne National Laboratory, Lemont, IL 60439, USA
| | - Sanjaya Lohani
- Department of Physics and Engineering Physics, Tulane University, New Orleans, LA 70118, USA
| | - Frank J. J. Leusen
- Faculty of Life Sciences, University of Bradford, Richmond Road, Bradford BD7 1DP, England
| | - Albert M. Lund
- OpenEye Scientific Software, 9 Bisbee Court, Suite D, Santa Fe, NM 87508, USA
- Department of Chemistry, University of Utah, 155 South 1452 East Room 405, Salt Lake City, UT 84112-0190, USA
| | - Jian Lv
- State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, People’s Republic of China
| | - Yanming Ma
- State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, People’s Republic of China
| | - Noa Marom
- Department of Physics and Engineering Physics, Tulane University, New Orleans, LA 70118, USA
- Department of Materials Science and Engineering and Department of Physics, Carnegie Mellon University, Pittsburgh, PA 15213, USA
| | - Artëm E. Masunov
- NanoScience Technology Center, University of Central Florida, 12424 Research Parkway, PAV400, Orlando, FL 32826, USA
- Department of Chemistry, University of Central Florida, 4111 Libra Drive PSB225, Orlando, FL 32816, USA
- Department of Physics, University of Central Florida, 4111 Libra Drive PSB430, Orlando, FL 32816, USA
- Department of Condensed Matter Physics, National Research Nuclear University MEPhI, Kashirskoye shosse 31, Moscow 115409, Russia
| | - Patrick McCabe
- The Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, England
| | - David P. McMahon
- School of Chemistry, University of Southampton, Southampton SO17 1BJ, England
| | - Hugo Meekes
- Radboud University, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - Michael P. Metz
- Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA
| | - Alston J. Misquitta
- School of Physics and Astronomy, Queen Mary University of London, London E1 4NS, England
| | | | - Bartomeu Monserrat
- Cavendish Laboratory, 19, J. J. Thomson Avenue, Cambridge CB3 0HE, England
- Department of Physics and Astronomy, Rutgers University, Piscataway, NJ 08854-8019, USA
| | - Richard J. Needs
- Cavendish Laboratory, 19, J. J. Thomson Avenue, Cambridge CB3 0HE, England
| | | | - Jonas Nyman
- School of Chemistry, University of Southampton, Southampton SO17 1BJ, England
| | - Shigeaki Obata
- Educational Programs on Advanced Simulation Engineering, Toyohashi University of Technology, 1-1 Hibarigaoka, Tempaku-cho, Toyohashi, Aichi 441-8580, Japan
| | - Harald Oberhofer
- Chair for Theoretical Chemistry and Catalysis Research Center, Technische Universität München, Lichtenbergstr. 4, D-85747 Garching, Germany
| | - Artem R. Oganov
- Department of Geosciences, Center for Materials by Design, and Institute for Advanced Computational Science, SUNY Stony Brook, NY 11794-2100, USA
- Skolkovo Institute of Science and Technology, Skolkovo Innovation Centers, Bldg. 3, Moscow Region, 143026, Russia
- Moscow Institute of Physics and Technology, 9 Institutskiy Lane, Dolgoprudny City, Moscow Region 141700, Russia
- International Center for Materials Discovery, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China
| | - Anita M. Orendt
- Center for High Performance Computing, University of Utah, 155 South 1452 East Room 405, Salt Lake City, UT 84112-0190, USA
| | - Gabriel I. Pagola
- Departamento de Física and Ifiba (CONICET) Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. I (1428), Buenos Aires, Argentina
| | - Constantinos C. Pantelides
- Department of Chemical Engineering, Centre for Process Systems Engineering, Imperial College London, London SW7 2AZ, England
| | - Chris J. Pickard
- Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge CB3 0FS, England
- Department of Physics and Astronomy, University College London, Gower St., London WC1E 6BT, England
| | - Rafal Podeszwa
- Institute of Chemistry, University of Silesia, Szkolna 9, 40-006 Katowice, Poland
| | - Louise S. Price
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, England
| | - Sarah L. Price
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, England
| | - Angeles Pulido
- School of Chemistry, University of Southampton, Southampton SO17 1BJ, England
| | - Murray G. Read
- The Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, England
| | - Karsten Reuter
- Chair for Theoretical Chemistry and Catalysis Research Center, Technische Universität München, Lichtenbergstr. 4, D-85747 Garching, Germany
| | - Elia Schneider
- Department of Chemistry, New York University, New York, NY 10003, USA
| | - Christoph Schober
- Chair for Theoretical Chemistry and Catalysis Research Center, Technische Universität München, Lichtenbergstr. 4, D-85747 Garching, Germany
| | - Gregory P. Shields
- The Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, England
| | - Pawanpreet Singh
- University Institute of Pharmaceutical Sciences, Panjab University, Chandigarh, India
| | - Isaac J. Sugden
- Department of Chemical Engineering, Centre for Process Systems Engineering, Imperial College London, London SW7 2AZ, England
| | - Krzysztof Szalewicz
- Department of Physics and Astronomy, University of Delaware, Newark, DE 19716, USA
| | | | - Alexandre Tkatchenko
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195, Berlin, Germany
- Physics and Materials Science Research Unit, University of Luxembourg, L-1511 Luxembourg
| | - Mark E. Tuckerman
- Department of Chemistry, New York University, New York, NY 10003, USA
- Courant Institute of Mathematical Sciences, New York University, New York, NY 10012, USA
- NYU-ECNU Center for Computational Chemistry at NYU Shanghai, 3663 Zhongshan Road North, Shanghai 200062, China
| | - Francesca Vacarro
- Department of Physics and Engineering Physics, Tulane University, New Orleans, LA 70118, USA
- Department of Chemistry, Loyola University, New Orleans, LA 70118, USA
| | - Manolis Vasileiadis
- Department of Chemical Engineering, Centre for Process Systems Engineering, Imperial College London, London SW7 2AZ, England
| | | | - Leslie Vogt
- Department of Chemistry, New York University, New York, NY 10003, USA
| | - Yanchao Wang
- State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, People’s Republic of China
| | - Rona E. Watson
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, England
| | - Gilles A. de Wijs
- Radboud University, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands
| | - Jack Yang
- School of Chemistry, University of Southampton, Southampton SO17 1BJ, England
| | - Qiang Zhu
- Department of Geosciences, Center for Materials by Design, and Institute for Advanced Computational Science, SUNY Stony Brook, NY 11794-2100, USA
| | - Colin R. Groom
- The Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, England
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11
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Zarycz N, Provasi PF, Pagola GI, Ferraro MB, Pelloni S, Lazzeretti P. Computational study of basis set and electron correlation effects on anapole magnetizabilities of chiral molecules. J Comput Chem 2016; 37:1552-8. [DOI: 10.1002/jcc.24369] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2016] [Revised: 03/03/2016] [Accepted: 03/07/2016] [Indexed: 11/09/2022]
Affiliation(s)
- Natalia Zarycz
- Departamento de Física; Northeastern University; Av. Libertad 5500 Corrientes W3400 AAS Argentina
| | - Patricio F. Provasi
- Departamento de Física; Northeastern University; Av. Libertad 5500 Corrientes W3400 AAS Argentina
| | - Gabriel I. Pagola
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, and IFIBA, CONICET; Universidad de Buenos Aires, Ciudad Universitaria; Pab. I, (1428) Buenos Aires Argentina
| | - Marta B. Ferraro
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, and IFIBA, CONICET; Universidad de Buenos Aires, Ciudad Universitaria; Pab. I, (1428) Buenos Aires Argentina
| | - Stefano Pelloni
- Dipartimento di Scienze Chimiche e Geologiche; Università degli Studi di Modena e Reggio Emilia; via G. Campi 213/b Modena 41125 Italy
| | - Paolo Lazzeretti
- Dipartimento di Scienze Chimiche e Geologiche; Università degli Studi di Modena e Reggio Emilia; via G. Campi 213/b Modena 41125 Italy
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12
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Abstract
Here we present the results of our unbiased searches of glycine polymorphs obtained using the Genetic Algorithms search implemented in Modified Genetic Algorithm for Crystals coupled with the local optimization and energy evaluation provided by Quantum Espresso. We demonstrate that it is possible to predict the crystal structures of a biomedical molecule using solely first principles calculations. We were able to find all the ambient pressure stable glycine polymorphs, which are found in the same energetic ordering as observed experimentally and the agreement between the experimental and predicted structures is of such accuracy that the two are visually almost indistinguishable.
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Affiliation(s)
- Albert M Lund
- Department of Chemistry, University of Utah, 155 South 1452 East Room 405, Salt Lake City, UT 84112-0190, US ; Center for High Performance Computing, University of Utah, 155 South 1452 East Room 405, Salt Lake City, UT 84112-0190, US
| | - Gabriel I Pagola
- Departamento de Física, and Ifiba (CONICET) Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. I (1428), Buenos Aires, Argentina
| | - Anita M Orendt
- Center for High Performance Computing, University of Utah, 155 South 1452 East Room 405, Salt Lake City, UT 84112-0190, US
| | - Marta B Ferraro
- Departamento de Física, and Ifiba (CONICET) Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. I (1428), Buenos Aires, Argentina
| | - Julio C Facelli
- Center for High Performance Computing, University of Utah, 155 South 1452 East Room 405, Salt Lake City, UT 84112-0190, US ; Department of Biomedical Informatics, University of Utah, 155 South 1452 East Room 405, Salt Lake City, UT 84112-0190, US
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13
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Sánchez M, Alkorta I, Elguero J, Ferraro MB, Sauer SP. On the transferability of atomic contributions to the optical rotatory power of hydrogen peroxide, methyl hydroperoxide and dimethyl peroxide. Mol Phys 2014. [DOI: 10.1080/00268976.2013.851420] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
| | - Ibon Alkorta
- Instituto de Química Médica (IQM-CSIC), Madrid, Spain
| | - José Elguero
- Instituto de Química Médica (IQM-CSIC), Madrid, Spain
| | - Marta B. Ferraro
- Departamento de Física and IFIBA, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, and CONICET, Argentina
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14
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Silva AMS, Silva VLM, Claramunt RM, Santa María D, Ferraro MB, Reviriego F, Alkorta I, Elguero J. The structures of two aldazines: [1,1'-(1E,1'E)-hydrazine-1,2-diylidenebis(methan-1-yl-1-ylidene)dinaphthalen-2-ol] (Lumogen) and 2,2'-(1E,1'E)-hydrazine-1,2-diylidenebis(methan-1-yl-1-ylidene)diphenol (salicylaldazine) in the solid state and in solution. Magn Reson Chem 2013; 51:530-540. [PMID: 23836625 DOI: 10.1002/mrc.3983] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2013] [Revised: 05/20/2013] [Accepted: 06/03/2013] [Indexed: 06/02/2023]
Abstract
A combination of NMR spectroscopy and theoretical methods Density functional theory including dispersion corrections (DFT-D) was used to study the structures of Lumogen and salicylaldazine. In the solid state, Lumogen exists as the dihydroxy tautomer 1a (an azine, C=N-N=C) as was already known from an X-ray determination. In a deuterated dimethyl sulfoxide solution, another tautomer is observed besides 1a; its structure corresponds to the hydroxy-oxo tautomer 1b (a hydrazone, C=N-NH-Csp(2)). In what concerns salicylaldazine, we have observed only the dihydroxy tautomer 2a.
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Affiliation(s)
- Artur M S Silva
- Chemistry Department and QOPNA, University of Aveiro, 3810-193 Aveiro, Portugal
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15
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Kjaer H, Nielsen MR, Pagola GI, Ferraro MB, Lazzeretti P, P. A. Sauer S. Nuclear magnetic resonance J coupling constant polarizabilities of hydrogen peroxide: A basis set and correlation study. J Comput Chem 2012; 33:1845-53. [DOI: 10.1002/jcc.23013] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2011] [Revised: 04/03/2012] [Accepted: 04/19/2012] [Indexed: 11/10/2022]
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16
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Alkorta I, Elguero J, Provasi PF, Pagola GI, Ferraro MB. Electric field effects on nuclear magnetic shielding of the 1:1 and 2:1 (homo and heterochiral) complexes of XOOX' (X, X' = H, CH3) with lithium cation and their chiral discrimination. J Chem Phys 2012; 135:104116. [PMID: 21932885 DOI: 10.1063/1.3632086] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
The set of 1:1 and 2:1 complexes of XOOX' (X, X' = H, CH(3)) with lithium cation has been studied to determine if they are suitable candidates for chiral discrimination in an isotropic medium via nuclear magnetic resonance spectroscopy. Conventional nuclear magnetic resonance is unable to distinguish between enantiomers in the absence of a chiral solvent. The criterion for experimental detection is valuated by the isotropic part of nuclear shielding polarisability tensors, related to a pseudoscalar of opposite sign for two enantiomers. The study includes calculations at coupled Hartree-Fock and density functional theory schemes for (17)O nucleus in each compound. Additional calculations for (1)H are also included for some compounds. A huge static homogeneous electric field, perpendicular to the magnetic field of the spectromer, as big as ≈1.7 × 10(8) V m(-1) should be applied to observe a shift of ≈1 ppm for (17)O magnetic shielding in the proposed set of complexes.
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Affiliation(s)
- Ibon Alkorta
- Instituto de Química Médica (CSIC), Juan de la Cierva, 3, E-28006 Madrid, Spain
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17
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Bardwell DA, Adjiman CS, Arnautova YA, Bartashevich E, Boerrigter SXM, Braun DE, Cruz-Cabeza AJ, Day GM, Della Valle RG, Desiraju GR, van Eijck BP, Facelli JC, Ferraro MB, Grillo D, Habgood M, Hofmann DWM, Hofmann F, Jose KVJ, Karamertzanis PG, Kazantsev AV, Kendrick J, Kuleshova LN, Leusen FJJ, Maleev AV, Misquitta AJ, Mohamed S, Needs RJ, Neumann MA, Nikylov D, Orendt AM, Pal R, Pantelides CC, Pickard CJ, Price LS, Price SL, Scheraga HA, van de Streek J, Thakur TS, Tiwari S, Venuti E, Zhitkov IK. Towards crystal structure prediction of complex organic compounds--a report on the fifth blind test. Acta Crystallogr B 2011; 67:535-51. [PMID: 22101543 PMCID: PMC3222142 DOI: 10.1107/s0108768111042868] [Citation(s) in RCA: 246] [Impact Index Per Article: 18.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/01/2011] [Accepted: 10/16/2011] [Indexed: 12/04/2022]
Abstract
Following on from the success of the previous crystal structure prediction blind tests (CSP1999, CSP2001, CSP2004 and CSP2007), a fifth such collaborative project (CSP2010) was organized at the Cambridge Crystallographic Data Centre. A range of methodologies was used by the participating groups in order to evaluate the ability of the current computational methods to predict the crystal structures of the six organic molecules chosen as targets for this blind test. The first four targets, two rigid molecules, one semi-flexible molecule and a 1:1 salt, matched the criteria for the targets from CSP2007, while the last two targets belonged to two new challenging categories - a larger, much more flexible molecule and a hydrate with more than one polymorph. Each group submitted three predictions for each target it attempted. There was at least one successful prediction for each target, and two groups were able to successfully predict the structure of the large flexible molecule as their first place submission. The results show that while not as many groups successfully predicted the structures of the three smallest molecules as in CSP2007, there is now evidence that methodologies such as dispersion-corrected density functional theory (DFT-D) are able to reliably do so. The results also highlight the many challenges posed by more complex systems and show that there are still issues to be overcome.
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Affiliation(s)
- David A Bardwell
- Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge CB2 1EZ, England.
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Osorio E, Ferraro MB, Oña OB, Cardenas C, Fuentealba P, Tiznado W. Assembling Small Silicon Clusters Using Criteria of Maximum Matching of the Fukui Functions. J Chem Theory Comput 2011; 7:3995-4001. [DOI: 10.1021/ct200643z] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Edison Osorio
- Departamento de Química, Facultad de Ciencias Exactas, Universidad Andres Bello, Avenida República 252, Santiago de Chile
| | - Marta B. Ferraro
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, and IFIBA, CONICET, (1428) Ciudad Universitaria - Pab. I., Buenos Aires, Argentina
| | - Ofelia B. Oña
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, and IFIBA, CONICET, (1428) Ciudad Universitaria - Pab. I., Buenos Aires, Argentina
| | - Carlos Cardenas
- Departamento de Física, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, Chile and CEDENA
| | - Patricio Fuentealba
- Departamento de Física, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, Chile and CEDENA
| | - William Tiznado
- Departamento de Química, Facultad de Ciencias Exactas, Universidad Andres Bello, Avenida República 252, Santiago de Chile
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19
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Pagola GI, Ferraro MB, Pelloni S, Lazzeretti P, Sauer SPA. Erratum to: Electric field effects on nuclear spin–spin coupling tensors and chiral discrimination via NMR spectroscopy. Theor Chem Acc 2011. [DOI: 10.1007/s00214-011-1017-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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20
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Alkorta I, Elguero J, F. Provasi P, B. Ferraro M. Theoretical Study of the 1:1 and 2:1 (Homo- and Heterochiral) Complexes of XOOX′ (X, X′ = H, CH3) with Lithium Cation. J Phys Chem A 2011; 115:7805-10. [DOI: 10.1021/jp202912n] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Ibon Alkorta
- Instituto de Química Médica (CSIC), Juan de la Cierva, 3, E-28006 Madrid, Spain
| | - José Elguero
- Instituto de Química Médica (CSIC), Juan de la Cierva, 3, E-28006 Madrid, Spain
| | - Patricio F. Provasi
- Department of Physics, Northeastern University, and IMIT, CONICET, Avenida Libertad 5500, W 3404 AAS Corrientes, Argentina
| | - Marta B. Ferraro
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, and IFIBA, CONICET, Ciudad Universitaria, Pab. I, 1428 Buenos Aires, Argentina
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21
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Bikiel DE, Ramallo-López JM, Requejo FG, Oña OB, Ferraro MB, Facelli JC, Doctorovich F. Formation of one dimensional linear chains by Ir–Ir bonds in cis-dicarbonyldichloroiridate (I). Polyhedron 2011. [DOI: 10.1016/j.poly.2010.10.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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22
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Oña OB, Ferraro MB, Facelli JC. Transition from exo- to endo- Cu absorption in CuSi(n) clusters: A Genetic Algorithms Density Functional Theory (DFT) Study. Mol Simul 2011; 37:678-688. [PMID: 21785526 PMCID: PMC3139224 DOI: 10.1080/08927020903583830] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The characterization and prediction of the structures of metal silicon clusters is important for nanotechnology research because these clusters can be used as building blocks for nano devices, integrated circuits and solar cells. Several authors have postulated that there is a transition between exo to endo absorption of Cu in Si(n) clusters and showed that for n larger than 9 it is possible to find endohedral clusters. Unfortunately, no global searchers have confirmed this observation, which is based on local optimizations of plausible structures. Here we use parallel Genetic Algorithms (GA), as implemented in our MGAC software, directly coupled with DFT energy calculations to show that the global search of CuSi(n) cluster structures does not find endohedral clusters for n < 8 but finds them for n ≥ 10.
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Affiliation(s)
- Ofelia B. Oña
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina, ;
| | - Marta B. Ferraro
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina, ;
| | - Julio C. Facelli
- Department of Biomedical Informatics, University of Utah, 155 South 1452 East, Rm 405, Salt Lake City, US,
- Center for High Performance Computing, University of Utah, 155 South 1452 East, Rm 405, Salt Lake City, US,
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Pagola GI, Ferraro MB, Pelloni S, Lazzeretti P, Sauer SPA. Electric field effects on nuclear spin–spin coupling tensors and chiral discrimination via NMR spectroscopy. Theor Chem Acc 2010. [DOI: 10.1007/s00214-010-0851-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Kim S, Orendt AM, Ferraro MB, Facelli JC. Crystal structure prediction of flexible molecules using parallel genetic algorithms with a standard force field. J Comput Chem 2009; 30:1973-85. [PMID: 19130496 DOI: 10.1002/jcc.21189] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
This article describes the application of our distributed computing framework for crystal structure prediction (CSP) the modified genetic algorithms for crystal and cluster prediction (MGAC), to predict the crystal structure of flexible molecules using the general Amber force field (GAFF) and the CHARMM program. The MGAC distributed computing framework includes a series of tightly integrated computer programs for generating the molecule's force field, sampling crystal structures using a distributed parallel genetic algorithm and local energy minimization of the structures followed by the classifying, sorting, and archiving of the most relevant structures. Our results indicate that the method can consistently find the experimentally known crystal structures of flexible molecules, but the number of missing structures and poor ranking observed in some crystals show the need for further improvement of the potential.
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Affiliation(s)
- Seonah Kim
- Center for High Performance Computing, University of Utah, 155 South 1452 East Room 405, Salt Lake City, Utah 84112-0190, USA
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Tiznado W, Oña OB, Caputo MC, Ferraro MB, Fuentealba P. Theoretical Study of the Structure and Electronic Properties of Si3On− and Si6On− (n = 1−6) Clusters. Fragmentation and Formation Patterns. J Chem Theory Comput 2009; 5:2265-73. [DOI: 10.1021/ct900320r] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- William Tiznado
- Departamento de Ciencias Químicas, Facultad de Ecología y Recursos Naturales, Universidad Andres Bello, Av. República 275, Santiago-Chile, Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria - Pab. I., Argentina, and Departamento de Física, Universidad de Chile, Las Palmeras 3425, Santiago-Chile
| | - Ofelia B. Oña
- Departamento de Ciencias Químicas, Facultad de Ecología y Recursos Naturales, Universidad Andres Bello, Av. República 275, Santiago-Chile, Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria - Pab. I., Argentina, and Departamento de Física, Universidad de Chile, Las Palmeras 3425, Santiago-Chile
| | - María C. Caputo
- Departamento de Ciencias Químicas, Facultad de Ecología y Recursos Naturales, Universidad Andres Bello, Av. República 275, Santiago-Chile, Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria - Pab. I., Argentina, and Departamento de Física, Universidad de Chile, Las Palmeras 3425, Santiago-Chile
| | - Marta B. Ferraro
- Departamento de Ciencias Químicas, Facultad de Ecología y Recursos Naturales, Universidad Andres Bello, Av. República 275, Santiago-Chile, Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria - Pab. I., Argentina, and Departamento de Física, Universidad de Chile, Las Palmeras 3425, Santiago-Chile
| | - Patricio Fuentealba
- Departamento de Ciencias Químicas, Facultad de Ecología y Recursos Naturales, Universidad Andres Bello, Av. República 275, Santiago-Chile, Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria - Pab. I., Argentina, and Departamento de Física, Universidad de Chile, Las Palmeras 3425, Santiago-Chile
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Boyd J, Pagola GI, Caputo MC, Ferraro MB, Lazzeretti P. Calculation of Hypershielding Contribution to Isotropic Nitrogen Shielding in Strong Magnetic Fields. J Chem Theory Comput 2009; 5:1343-9. [DOI: 10.1021/ct900034d] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jonathan Boyd
- Department of Biochemistry, South Parks Road, Oxford, OX1 3QU, United Kingdom
| | - Gabriel I. Pagola
- Departamento de Física, Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires, Ciudad Universitaria, Pab. I, (1428) Buenos Aires, Argentina
| | - Maria C. Caputo
- Departamento de Física, Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires, Ciudad Universitaria, Pab. I, (1428) Buenos Aires, Argentina
| | - Marta B. Ferraro
- Departamento de Física, Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires, Ciudad Universitaria, Pab. I, (1428) Buenos Aires, Argentina
| | - Paolo Lazzeretti
- Dipartimento di Chimica dell’Università degli Studi di Modena e Reggio Emilia, Via Campi 183, 41100 Modena, Italy
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Caputo MC, Oña O, Ferraro MB. Theoretical prediction of atomic and electronic structure of neutral Si6Om (m=1–11) clusters. J Chem Phys 2009; 130:134115. [DOI: 10.1063/1.3080549] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
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28
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Day GM, Cooper TG, Cruz-Cabeza AJ, Hejczyk KE, Ammon HL, Boerrigter SXM, Tan JS, Della Valle RG, Venuti E, Jose J, Gadre SR, Desiraju GR, Thakur TS, van Eijck BP, Facelli JC, Bazterra VE, Ferraro MB, Hofmann DWM, Neumann MA, Leusen FJJ, Kendrick J, Price SL, Misquitta AJ, Karamertzanis PG, Welch GWA, Scheraga HA, Arnautova YA, Schmidt MU, van de Streek J, Wolf AK, Schweizer B. Significant progress in predicting the crystal structures of small organic molecules--a report on the fourth blind test. Acta Crystallogr B 2009; 65:107-25. [PMID: 19299868 DOI: 10.1107/s0108768109004066] [Citation(s) in RCA: 271] [Impact Index Per Article: 18.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2008] [Accepted: 02/03/2009] [Indexed: 12/14/2023]
Abstract
We report on the organization and outcome of the fourth blind test of crystal structure prediction, an international collaborative project organized to evaluate the present state in computational methods of predicting the crystal structures of small organic molecules. There were 14 research groups which took part, using a variety of methods to generate and rank the most likely crystal structures for four target systems: three single-component crystal structures and a 1:1 cocrystal. Participants were challenged to predict the crystal structures of the four systems, given only their molecular diagrams, while the recently determined but as-yet unpublished crystal structures were withheld by an independent referee. Three predictions were allowed for each system. The results demonstrate a dramatic improvement in rates of success over previous blind tests; in total, there were 13 successful predictions and, for each of the four targets, at least two groups correctly predicted the observed crystal structure. The successes include one participating group who correctly predicted all four crystal structures as their first ranked choice, albeit at a considerable computational expense. The results reflect important improvements in modelling methods and suggest that, at least for the small and fairly rigid types of molecules included in this blind test, such calculations can be constructively applied to help understand crystallization and polymorphism of organic molecules.
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Affiliation(s)
- Graeme M Day
- The Pfizer Institute for Pharmaceutical Materials Science, University Chemical Laboratory, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, England.
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Sánchez M, Ferraro MB, Alkorta I, Elguero J, Sauer SPA. Atomic partition of the optical rotatory power of methylhydroperoxide. J Chem Phys 2008; 128:064318. [DOI: 10.1063/1.2826351] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Ferraro MB, Caputo MC, Pagola GI, Lazzeretti P. Electric quadrupole polarizabilities of nuclear magnetic shielding in some small molecules. J Chem Phys 2008; 128:044117. [PMID: 18247940 DOI: 10.1063/1.2826342] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Computational procedures, based on (i) the Ramsey common origin approach and (ii) the continuous transformation of the origin of the quantum mechanical current density-diamagnetic zero (CTOCD-DZ), were applied at the Hartree-Fock level to determine electric quadrupole polarizabilities of nuclear magnetic shielding for molecules in the presence of a nonuniform electric field with a uniform gradient. The quadrupole polarizabilities depend on the origin of the coordinate system, but values of the magnetic field induced at a reference nucleus, determined via the CTOCD-DZ approach, are origin independent for any calculations relying on the algebraic approximation, irrespective of size and quality of the (gaugeless) basis set employed. On the other hand, theoretical estimates of the induced magnetic field obtained by single-origin methods are translationally invariant only in the limit of complete basis sets. Calculations of electric quadrupole polarizabilities of nuclear magnetic shielding are reported for H(2), HF, H(2)O, NH(3), and CH(4) molecules.
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Affiliation(s)
- M B Ferraro
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. I, 1428 Buenos Aires, Argentina.
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Caputo MC, Ferraro MB, Pagola GI, Lazzeretti P. Calculation of the electric hypershielding at the nuclei of molecules in a strong magnetic field. J Chem Phys 2007; 126:154103. [PMID: 17461610 DOI: 10.1063/1.2716666] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
The third-rank electric hypershielding at the nuclei of 14 small molecules has been evaluated at the Hartree-Fock level of accuracy, by a pointwise procedure for the geometrical derivatives of magnetic susceptibilities and by a straightforward use of its definition within the Rayleigh-Schrodinger perturbation theory. The connection between these two quantities is provided by the Hellmann-Feynman theorem. The magnetically induced hypershielding at the nuclei accounts for distortion of molecular geometry caused by strong magnetic fields and for related changes of magnetic susceptibility. In homonuclear diatomics H(2), N(2), and F(2), a field along the bond direction squeezes the electron cloud toward the center, determining shorter but stronger bond. It is shown that constraints for rotational and translational invariances and hypervirial theorems provide a natural criterion for Hartree-Fock quality of computed nuclear electric hypershielding.
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Affiliation(s)
- M C Caputo
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. I, 1428 Buenos Aires, Argentina
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Bazterra VE, Thorley M, Ferraro MB, Facelli JC. A Distributed Computing Method for Crystal Structure Prediction of Flexible Molecules: An Application to N-(2-Dimethyl-4,5-dinitrophenyl) Acetamide. J Chem Theory Comput 2006; 3:201-9. [DOI: 10.1021/ct6002115] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Victor E. Bazterra
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. I (1428), Buenos Aires, Argentina, and Center for High Performance Computing, University of Utah, 155 South 1452 East Rm 405, Salt Lake City, Utah 84112-0190
| | - Matthew Thorley
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. I (1428), Buenos Aires, Argentina, and Center for High Performance Computing, University of Utah, 155 South 1452 East Rm 405, Salt Lake City, Utah 84112-0190
| | - Marta B. Ferraro
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. I (1428), Buenos Aires, Argentina, and Center for High Performance Computing, University of Utah, 155 South 1452 East Rm 405, Salt Lake City, Utah 84112-0190
| | - Julio C. Facelli
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. I (1428), Buenos Aires, Argentina, and Center for High Performance Computing, University of Utah, 155 South 1452 East Rm 405, Salt Lake City, Utah 84112-0190
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33
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Tiznado W, Oña OB, Bazterra VE, Caputo MC, Facelli JC, Ferraro MB, Fuentealba P. Theoretical study of the adsorption of H on Sin clusters, (n=3–10). J Chem Phys 2005; 123:214302. [PMID: 16356043 DOI: 10.1063/1.2128675] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A recently proposed local Fukui function is used to predict the binding site of atomic hydrogen on silicon clusters. To validate the predictions, an extensive search for the more stable SinH (n=3-10) clusters has been done using a modified genetic algorithm. In all cases, the isomer predicted by the Fukui function is found by the search, but it is not always the most stable one. It is discussed that in the cases where the geometrical structure of the bare silicon cluster suffers a considerable change due to the addition of one hydrogen atom, the situation is more complicated and the relaxation effects should be considered.
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Affiliation(s)
- William Tiznado
- Departamento de Química, Facultad de Ciencias, Universidad de Chile, Casilla 653, Santiago, Chile.
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Day GM, Motherwell WDS, Ammon HL, Boerrigter SXM, Della Valle RG, Venuti E, Dzyabchenko A, Dunitz JD, Schweizer B, van Eijck BP, Erk P, Facelli JC, Bazterra VE, Ferraro MB, Hofmann DWM, Leusen FJJ, Liang C, Pantelides CC, Karamertzanis PG, Price SL, Lewis TC, Nowell H, Torrisi A, Scheraga HA, Arnautova YA, Schmidt MU, Verwer P. A third blind test of crystal structure prediction. Acta Crystallogr B Struct Sci 2005; 61:511-27. [PMID: 16186652 DOI: 10.1107/s0108768105016563] [Citation(s) in RCA: 240] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2004] [Accepted: 05/24/2005] [Indexed: 11/10/2022]
Abstract
Following the interest generated by two previous blind tests of crystal structure prediction (CSP1999 and CSP2001), a third such collaborative project (CSP2004) was hosted by the Cambridge Crystallographic Data Centre. A range of methodologies used in searching for and ranking the likelihood of predicted crystal structures is represented amongst the 18 participating research groups, although most are based on the global minimization of the lattice energy. Initially the participants were given molecular diagrams of three molecules and asked to submit three predictions for the most likely crystal structure of each. Unlike earlier blind tests, no restriction was placed on the possible space group of the target crystal structures. Furthermore, Z′ = 2 structures were allowed. Part-way through the test, a partial structure report was discovered for one of the molecules, which could no longer be considered a blind test. Hence, a second molecule from the same category (small, rigid with common atom types) was offered to the participants as a replacement. Success rates within the three submitted predictions were lower than in the previous tests – there was only one successful prediction for any of the three `blind' molecules. For the `simplest' rigid molecule, this lack of success is partly due to the observed structure crystallizing with two molecules in the asymmetric unit. As in the 2001 blind test, there was no success in predicting the structure of the flexible molecule. The results highlight the necessity for better energy models, capable of simultaneously describing conformational and packing energies with high accuracy. There is also a need for improvements in search procedures for crystals with more than one independent molecule, as well as for molecules with conformational flexibility. These are necessary requirements for the prediction of possible thermodynamically favoured polymorphs. Which of these are actually realised is also influenced by as yet insufficiently understood processes of nucleation and crystal growth.
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Affiliation(s)
- G M Day
- The Pfizer Institute for Pharmaceutical Materials Science, University Chemical Laboratory, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, England.
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Faglioni F, Ligabue A, Pelloni S, Soncini A, Viglione RG, Ferraro MB, Zanasi R, Lazzeretti P. Why Downfield Proton Chemical Shifts Are Not Reliable Aromaticity Indicators. Org Lett 2005; 7:3457-60. [PMID: 16048316 DOI: 10.1021/ol051103v] [Citation(s) in RCA: 75] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Traces of magnetizability, traces of magnetic shielding at the hydrogen nuclei, and nucleus-independent chemical shift are not reliable aromaticity quantifiers for planar conjugated hydrocarbons. A measure of aromaticity is provided by the out-of-plane tensor components, whose magnitude is influenced by the pi-ring currents. The failure of nucleus-independent chemical shift in this regard was proved for the molecule shown in the abstract graphic, sustaining a diatropic pi-current. The validity of the ring-current model is reaffirmed. [structure: see text]
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Affiliation(s)
- F Faglioni
- Dipartimento di Chimica, Università degli Studi di Modena e Reggio Emilia, via G. Campi 183, 41100 Modena, Italy
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Ferraro MB, Faglioni F, Ligabue A, Pelloni S, Lazzeretti P. Ring current effects on nuclear magnetic shielding of carbon in the benzene molecule. Magn Reson Chem 2005; 43:316-320. [PMID: 15625723 DOI: 10.1002/mrc.1536] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The differential Biot-Savart law of classical electrodynamics was applied to develop a ring current model for the magnetic shielding of the carbon nucleus in benzene. It is shown that the local effect of the pi currents, induced by a magnetic field normal to the molecular plane, on the sigmaC out-of-plane shielding tensor component vanishes. However, approximately 10% of sigmaC is due to the shielding contributions from pi current density in the region of the other carbon atoms. Magnetic shielding density maps obtained via quantum mechanical procedures confirm the predictions of the classical model.
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Affiliation(s)
- M B Ferraro
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. I, (1428) Buenos Aires, Argentina
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Abstract
The fourth-rank hypermagnetizability tensor of the benzene molecule has been evaluated at the coupled Hartree-Fock level of accuracy within the conventional common-origin approach, adopting gaugeless basis sets of increasing size and flexibility. The degree of convergence of theoretical tensor components has been estimated allowing for two different coordinate systems. It is shown that a strong magnetic field perpendicular to the plane of the molecule causes a distortion of the electron charge density, which tends to concentrate in the region of the C-C bonds. This charge contraction has a dynamical origin, and can be interpreted as a feedback effect in terms of the classical Lorentz force acting on the electron current density.
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Affiliation(s)
- G I Pagola
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellon I, (1428) Buenos Aires, Argentina
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Di Fiori N, Orendt AM, Caputo MC, Ferraro MB, Facelli JC. Modeling solid-state effects on NMR chemical shifts using electrostatic models. Magn Reson Chem 2004; 42 Spec no:S41-S47. [PMID: 15366040 DOI: 10.1002/mrc.1432] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
This paper presents a comparison of the embedded ion method (EIM) and the surface charge representation of the electrostatic embedding potential (SCREEP) method, two methods which can be used to calculate solid-state effects on NMR chemical shifts. The results in a selected group of compounds with known single-crystal solid-state NMR data and neutron diffraction structures, confirm that these effects are important in both (13)C and (15)N chemical shifts. The solid-state effects calculated by both methods are similar and of equal statistical quality when compared with the experimental data.
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Affiliation(s)
- Nicolas Di Fiori
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. I, (1428) Buenos Aires, Argentina
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Oña O, Bazterra VE, Caputo MC, Ferraro MB, Fuentealba P, Facelli JC. Modified genetic algorithms to model atomic cluster structures: CuSi clusters. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/j.theochem.2004.04.060] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Pagola GI, Caputo MC, Ferraro MB, Lazzeretti P. Calculation of the fourth-rank molecular hypermagnetizability of some small molecules. J Chem Phys 2004; 120:9556-60. [PMID: 15267967 DOI: 10.1063/1.1695551] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
A computational scheme has been developed within the framework of Rayleigh-Schrödinger perturbation theory to evaluate nonlinear interaction energy contributions for a molecule in the presence of an external spatially uniform, time-independent magnetic field. Terms connected with the fourth power of the perturbing field, representing the fourth-rank hypermagnetizabilities of five small molecules, have been evaluated at the coupled Hartree-Fock level of accuracy within the conventional common-origin approach. Gaugeless basis sets of increasing size and flexibility have been employed in a numerical test, adopting two different coordinate systems to estimate the degree of convergence of theoretical tensor components.
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Affiliation(s)
- G I Pagola
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. I, (1428) Buenos Aires, Argentina
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Boyd J, Domene C, Redfield C, Ferraro MB, Lazzeretti P. Calculation of dipole-shielding polarizabilities (sigma(alphabetagamma)I): the influence of uniform electric field effects on the shielding of backbone nuclei in proteins. J Am Chem Soc 2003; 125:9556-7. [PMID: 12903999 DOI: 10.1021/ja034855y] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A significant contribution to the chemical shielding of a nucleus can arise from uniform electric fields that act to distort the electronic charge distribution surrounding a nucleus and, hence, affect the nuclear shielding. It has been shown by Buckingham (Buckingham, A. D. Can. J. Chem. 1960, 38, 300) that the nuclear magnetic shielding tensor sigmaalphabetaI of a nucleus in the presence of an external weak static uniform electric field E may be expanded using sigmaalphabetaI(E) = sigmaalphabetaI + sigmaalphabetagammaIEgamma + 1/2sigmaalphabetagammadeltaIEgammaEdelta + sigmaalphabeta,gammadeltaIEgammadelta ... The third rank tensor sigmaalphabetagammaI is referred to as the dipole-shielding polarizability and describes the nonlinear response of the electron cloud to first order in E, muI, and B0. We report calculations of sigmaalphabetagammaI for the N, HN, and C' nuclei in N-methyl acetamide (NMA) and show that these tensors can be used to provide considerable insight into the behavior of uniform electric fields upon the shielding of backbone nuclei in proteins. The sigmaalphabetagammaI values for the N, HN, and C' of NMA were calculated using the continuous transformation of the origin of the current density (CTOCD) scheme with the diamagnetic contribution set to zero (CTOCD-DZ). Values are given for the individual tensor components of sigmaalphabetagammaI for each nucleus. To test that the calculations have provided a reasonable estimate for the sigmaalphabetagammaI of N, HN, and C' nuclei in proteins, a pH titration was performed using Hen Lysozyme (HEWL). The pH-induced isotropic shielding changes for the C', N, and HN nuclei in some peptide bonds close to E35 ( approximately <8 A) were extracted from sets of fitted titration curves. Assuming the experimental shielding changes arise solely from uniform electric field effects caused by the deprotonation of E35, without any other pH-induced structural alterations which might lead to a shielding change, the experimental shielding differences were compared to those calculated via the product Agamma(I).Egamma where Agamma(I) = (1/3)sigmaalphaalphagammaIota. The agreement with the experimental data is in many cases reasonable and suggests that, within the Buckingham formalism, the complete sigmaalphabetagammaI tensors reported here will be helpful to resolve the importance of uniform electric fields upon isotropic and anisotropic shielding in proteins and their complexes.
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Affiliation(s)
- Jonathan Boyd
- Department of Biochemistry, University of Oxford, UK.
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Bazterra VE, Caputo MC, Ferraro MB, Fuentealba P. On the theoretical determination of the static dipole polarizability of intermediate size silicon clusters. J Chem Phys 2002. [DOI: 10.1063/1.1521761] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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43
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Bazterra VE, Ferraro MB, Facelli JC. Modified genetic algorithm to model crystal structures. II. Determination of a polymorphic structure of benzene using enthalpy minimization. J Chem Phys 2002. [DOI: 10.1063/1.1458548] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Bazterra VE, Ferraro MB, Facelli JC. Modified genetic algorithm to model crystal structures. I. Benzene, naphthalene and anthracene. J Chem Phys 2002. [DOI: 10.1063/1.1458547] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Ferraro MB, Repetto V, Facelli JC. Modeling NMR chemical shifts: a comparison of charge models for solid state effects on 15N chemical shift tensors. Solid State Nucl Magn Reson 1998; 10:185-189. [PMID: 9603618 DOI: 10.1016/s0926-2040(97)00086-6] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
This paper presents results from applying different point charge models to take into account intermolecular interactions to model the solid state effects on the 15N NMR chemical shifts tensors. The DFT approach with the BLYP gradient corrected exchange correlation functional has been used because it can include electron correlation effects at a reasonable cost and is able to reproduce 15N NMR chemical shifts with reasonable accuracy. The results obtained with the point charge models are compared with the experimental data and with results obtained using the cluster model, which includes explicitly neighboring molecular fragments. The results show that the point charge models can take into account solid state effects at a cost much lower than the cluster methods.
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Affiliation(s)
- M B Ferraro
- Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina
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Bochicchio RC, Ferraro MB, Grinberg H, Cavasotto C. Self-energies for the particle-hole propagator from Feynman-Dyson equations. ACTA ACUST UNITED AC 1995. [DOI: 10.1016/0166-1280(94)03976-r] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Caputo MC, Ferraro MB, Lazzeretti P, Malagoli M, Zanasi R. Theoretical study of the magnetic properties of a methane molecule in a nonuniform magnetic field. Phys Rev A 1994; 49:3445-3449. [PMID: 9910642 DOI: 10.1103/physreva.49.3445] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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Ferraro MB, Herr TE, Lazzeretti P, Malagoli M, Zanasi R. Calculation of molecular magnetic properties within the Landau gauge. Phys Rev A 1992; 45:6272-6281. [PMID: 9907748 DOI: 10.1103/physreva.45.6272] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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