1
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Holmes ST, Schönzart J, Philips AB, Kimball JJ, Termos S, Altenhof AR, Xu Y, O'Keefe CA, Autschbach J, Schurko RW. Structure and bonding in rhodium coordination compounds: a 103Rh solid-state NMR and relativistic DFT study. Chem Sci 2024; 15:2181-2196. [PMID: 38332836 PMCID: PMC10848688 DOI: 10.1039/d3sc06026h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2023] [Accepted: 12/06/2023] [Indexed: 02/10/2024] Open
Abstract
This study demonstrates the application of 103Rh solid-state NMR (SSNMR) spectroscopy to inorganic and organometallic coordination compounds, in combination with relativistic density functional theory (DFT) calculations of 103Rh chemical shift tensors and their analysis with natural bond orbital (NBO) and natural localized molecular orbital (NLMO) protocols, to develop correlations between 103Rh chemical shift tensors, molecular structure, and Rh-ligand bonding. 103Rh is one of the least receptive NMR nuclides, and consequently, there are very few reports in the literature. We introduce robust 103Rh SSNMR protocols for stationary samples, which use the broadband adiabatic inversion-cross polarization (BRAIN-CP) pulse sequence and wideband uniform-rate smooth-truncation (WURST) pulses for excitation, refocusing, and polarization transfer, and demonstrate the acquisition of 103Rh SSNMR spectra of unprecedented signal-to-noise and uniformity. The 103Rh chemical shift tensors determined from these spectra are complemented by NBO/NLMO analyses of contributions of individual orbitals to the 103Rh magnetic shielding tensors to understand their relationship to structure and bonding. Finally, we discuss the potential for these experimental and theoretical protocols for investigating a wide range of materials containing the platinum group elements.
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Affiliation(s)
- Sean T Holmes
- Department of Chemistry & Biochemistry, Florida State University Tallahassee FL 32306 USA
- National High Magnetic Field Laboratory Tallahassee FL 32310 USA
| | - Jasmin Schönzart
- Department of Chemistry & Biochemistry, Florida State University Tallahassee FL 32306 USA
- National High Magnetic Field Laboratory Tallahassee FL 32310 USA
| | - Adam B Philips
- Department of Chemistry, University at Buffalo, State University of New York Buffalo NY 14260-3000 USA
| | - James J Kimball
- Department of Chemistry & Biochemistry, Florida State University Tallahassee FL 32306 USA
- National High Magnetic Field Laboratory Tallahassee FL 32310 USA
| | - Sara Termos
- Department of Chemistry & Biochemistry, Florida State University Tallahassee FL 32306 USA
- National High Magnetic Field Laboratory Tallahassee FL 32310 USA
| | - Adam R Altenhof
- Department of Chemistry & Biochemistry, Florida State University Tallahassee FL 32306 USA
- National High Magnetic Field Laboratory Tallahassee FL 32310 USA
| | - Yijue Xu
- National High Magnetic Field Laboratory Tallahassee FL 32310 USA
| | - Christopher A O'Keefe
- Department of Chemistry & Biochemistry, University of Windsor Windsor ON N9B 3P4 Canada
| | - Jochen Autschbach
- Department of Chemistry, University at Buffalo, State University of New York Buffalo NY 14260-3000 USA
| | - Robert W Schurko
- Department of Chemistry & Biochemistry, Florida State University Tallahassee FL 32306 USA
- National High Magnetic Field Laboratory Tallahassee FL 32310 USA
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2
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Saielli G. Computational NMR spectroscopy of 205 Tl. J Comput Chem 2023; 44:2016-2029. [PMID: 37367222 DOI: 10.1002/jcc.27176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 05/19/2023] [Accepted: 05/23/2023] [Indexed: 06/28/2023]
Abstract
We have investigated the NMR chemical shift of 205 Tl in several thallium compounds, ranging from small covalent Tl(I) and Tl(III) molecules to supramolecular complexes with large organic ligands and some thallium halides. NMR calculations were run at the ZORA relativistic level, with and without spin-orbit coupling using few selected GGA and hybrid functionals, namely BP86, PBE, B3LYP, and PBE0. We also tested solvent effects both at the optimization level and at the NMR calculation step. At the ZORA-SO-PBE0 (COSMO) level of theory we find a very good performance of the computational protocol that allows to discard or retain possible structures/conformations based on the agreement between the calculated chemical shift and the experimental value.
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Affiliation(s)
- Giacomo Saielli
- CNR Institute on Membrane Technology, Unit of Padova, Padova, Italy
- Department of Chemical Sciences, University of Padova, Padova, Italy
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3
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Bai S, Quinn CM, Holmes ST, Dybowski C. High-resolution 13 C and 43 Ca solid-state NMR and computational studies of the ethylene glycol solvate of atorvastatin calcium. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2020; 58:1010-1017. [PMID: 31469449 DOI: 10.1002/mrc.4937] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Revised: 08/19/2019] [Accepted: 08/20/2019] [Indexed: 06/10/2023]
Abstract
We report 43 Ca and 13 C solid-state nuclear magnetic resonance (NMR) spectroscopic studies of the ethylene glycol solvate of atorvastatin calcium. The 13 C and 43 Ca chemical shift and 43 Ca quadrupolar coupling tensor parameters are reported. The results are interpreted in terms of the reported X-ray diffraction crystal structure of the solvate and are compared with the NMR parameters of atorvastatin calcium trihydrate, the active pharmaceutical ingredient in Lipitor®. Hartree-Fock and density functional theory calculations of the NMR parameters based on a cluster model derived from the optimized X-ray diffraction crystal structure of the ethylene glycol solvate of atorvastatin calcium are in reasonable agreement with the experimental 43 Ca and 13 C NMR measurables.
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Affiliation(s)
- Shi Bai
- Department of Chemistry and Biochemistry, University of Delaware, Newark, DE, USA
| | - Caitlin M Quinn
- Department of Chemistry and Biochemistry, University of Delaware, Newark, DE, USA
| | - Sean T Holmes
- Department of Chemistry and Biochemistry, University of Delaware, Newark, DE, USA
| | - Cecil Dybowski
- Department of Chemistry and Biochemistry, University of Delaware, Newark, DE, USA
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4
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Holmes ST, Schurko RW. A DFT/ZORA Study of Cadmium Magnetic Shielding Tensors: Analysis of Relativistic Effects and Electronic-State Approximations. J Chem Theory Comput 2019; 15:1785-1797. [PMID: 30721042 DOI: 10.1021/acs.jctc.8b01296] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Theoretical considerations are discussed for the accurate prediction of cadmium magnetic shielding tensors using relativistic density functional theory (DFT). Comparison is made between calculations that model the extended lattice of the cadmium-containing solids using periodic boundary conditions and pseudopotentials with calculations that use clusters of atoms. The all-electron cluster-based calculations afford an opportunity to examine the importance of (i) relativistic effects on cadmium magnetic shielding tensors, as introduced through the ZORA Hamiltonian at either the scalar (SC) or spin-orbit (SO) levels and (ii) variation in the class of the DFT approximation. Twenty-three combinations of pseudopotentials or all-electron methods, DFT functionals, and relativistic treatments are assessed for the prediction of the principal components of the magnetic shielding tensors of 30 cadmium sites. We find that the inclusion of SO coupling can increase the cadmium magnetic shielding by as much as ca. 1100 ppm for a certain principal values; these effects are most pronounced for cadmium sites featuring bonds to other heavy atoms such as cadmium, iodine, or selenium. The best agreement with experimental values is found at the ZORA SO level in combination with a hybrid DFT method featuring a large admixture of Hartree-Fock exchange such as BH&HLYP. Finally, a theoretical examination is presented of the magnetic shielding tensor of the Cd(I) site in Cd2(AlCl4)2.
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Affiliation(s)
- Sean T Holmes
- Department of Chemistry and Biochemistry , University of Windsor , Windsor , ON , Canada N9B 3P4
| | - Robert W Schurko
- Department of Chemistry and Biochemistry , University of Windsor , Windsor , ON , Canada N9B 3P4
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5
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Alkan F, Dybowski C. Spin-orbit effects on the 125Te magnetic-shielding tensor: A cluster-based ZORA/DFT investigation. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2018; 95:6-11. [PMID: 30189330 DOI: 10.1016/j.ssnmr.2018.08.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Revised: 08/24/2018] [Accepted: 08/24/2018] [Indexed: 06/08/2023]
Abstract
Cluster-based calculations of 125Te magnetic-shielding tensors demonstrate that inclusion of spin-orbit effects is necessary to obtain the best agreement of theoretical predictions with experiment. The spin-orbit contribution to shielding depends on the oxidation state and stereochemistry of the 125Te site. Comparison of the performance of various density functionals indicates that GGA functionals behave similarly to each other in predicting NMR magnetic shielding. The use of hybrid functionals improves the predictive ability on average for a large set of 125Te-containing materials. The amount of Hartree-Fock exchange affects the predicted parameters. Inclusion of larger Hartree-Fock exchange contributions in hybrid functionals results in larger slopes of the correlation between calculated magnetic-shielding and experimental chemical-shift principal components, by 10-15% from the ideal value.
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Affiliation(s)
- Fahri Alkan
- Department of Chemistry, Kansas State University, Manhattan, KS, 66506, USA
| | - Cecil Dybowski
- Department of Chemistry and Biochemistry, University of Delaware, Newark, DE, 19716, USA.
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6
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Todisco S, Saielli G, Gallo V, Latronico M, Rizzuti A, Mastrorilli P. 31P and 195Pt solid-state NMR and DFT studies on platinum(i) and platinum(ii) complexes. Dalton Trans 2018; 47:8884-8891. [DOI: 10.1039/c8dt01561a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
31P and 195Pt solid state NMR spectra on anti-[(PHCy)ClPt(μ-PCy2)2Pt(PHCy)Cl] (3) and [(PHCy2)Pt(μ-PCy2)(κ2P,O-μ-POCy2)Pt(PHCy2)] (Pt–Pt) (4) were recorded under CP/MAS conditions (31P) or with the CP/CPMG pulse sequence (195Pt) and compared to data obtained by relativistic DFT calculations of 31P and 195Pt CS tensors and isotropic shielding at the ZORA Spin Orbit level.
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Affiliation(s)
- Stefano Todisco
- Dipartimento di Ingegneria Civile
- Ambientale
- del Territorio
- Edile e di Chimica (DICATECh)
- Politecnico di Bari
| | - Giacomo Saielli
- Istituto per la Tecnologia delle Membrane
- Unità di Padova CNR
- Padova
- Italy
| | - Vito Gallo
- Dipartimento di Ingegneria Civile
- Ambientale
- del Territorio
- Edile e di Chimica (DICATECh)
- Politecnico di Bari
| | - Mario Latronico
- Dipartimento di Ingegneria Civile
- Ambientale
- del Territorio
- Edile e di Chimica (DICATECh)
- Politecnico di Bari
| | - Antonino Rizzuti
- Dipartimento di Ingegneria Civile
- Ambientale
- del Territorio
- Edile e di Chimica (DICATECh)
- Politecnico di Bari
| | - Piero Mastrorilli
- Dipartimento di Ingegneria Civile
- Ambientale
- del Territorio
- Edile e di Chimica (DICATECh)
- Politecnico di Bari
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7
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Alkan F, Holmes ST, Dybowski C. Role of Exact Exchange and Relativistic Approximations in Calculating 19F Magnetic Shielding in Solids Using a Cluster Ansatz. J Chem Theory Comput 2017; 13:4741-4752. [DOI: 10.1021/acs.jctc.7b00555] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Fahri Alkan
- Department
of Chemistry, Kansas State University, Manhattan, Kansas 66506, United States
| | - Sean T. Holmes
- Department
of Chemistry and Biochemistry, University of Windsor, Windsor, ON N9B 3P4, Canada
| | - Cecil Dybowski
- Department
of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
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8
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Fedoseeva YV, Orekhov AS, Chekhova GN, Koroteev VO, Kanygin MA, Senkovskiy BV, Chuvilin A, Pontiroli D, Riccò M, Bulusheva LG, Okotrub AV. Single-Walled Carbon Nanotube Reactor for Redox Transformation of Mercury Dichloride. ACS NANO 2017; 11:8643-8649. [PMID: 28783303 DOI: 10.1021/acsnano.7b04361] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Single-walled carbon nanotubes (SWCNTs) possessing a confined inner space protected by chemically resistant shells are promising for delivery, storage, and desorption of various compounds, as well as carrying out specific reactions. Here, we show that SWCNTs interact with molten mercury dichloride (HgCl2) and guide its transformation into dimercury dichloride (Hg2Cl2) in the cavity. The chemical state of host SWCNTs remains almost unchanged except for a small p-doping from the guest Hg2Cl2 nanocrystals. The density functional theory calculations reveal that the encapsulated HgCl2 molecules become negatively charged and start interacting via chlorine bridges when local concentration increases. This reduces the bonding strength in HgCl2, which facilitates removal of chlorine, finally leading to formation of Hg2Cl2 species. The present work demonstrates that SWCNTs not only serve as a template for growing nanocrystals but also behave as an electron-transfer catalyst in the spatially confined redox reaction by donation of electron density for temporary use by the guests.
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Affiliation(s)
- Yuliya V Fedoseeva
- Nikolaev Institute of Inorganic Chemistry SB RAS , 3 Acad. Lavrentiev Avenue, Novosibirsk 630090, Russia
- Novosibirsk State University , 2 Pirogova Street, Novosibirsk 630090, Russia
| | - Andrey S Orekhov
- Electron Microscopy for Materials Science (EMAT), University of Antwerp , Groenenborgerlaan 171, 2020 Antwerp, Belgium
- National Research Center, Kurchatov Institute , Moscow 123182, Russia
| | - Galina N Chekhova
- Nikolaev Institute of Inorganic Chemistry SB RAS , 3 Acad. Lavrentiev Avenue, Novosibirsk 630090, Russia
| | - Victor O Koroteev
- Nikolaev Institute of Inorganic Chemistry SB RAS , 3 Acad. Lavrentiev Avenue, Novosibirsk 630090, Russia
- Novosibirsk State University , 2 Pirogova Street, Novosibirsk 630090, Russia
| | - Mikhail A Kanygin
- Nikolaev Institute of Inorganic Chemistry SB RAS , 3 Acad. Lavrentiev Avenue, Novosibirsk 630090, Russia
- Novosibirsk State University , 2 Pirogova Street, Novosibirsk 630090, Russia
| | - Boris V Senkovskiy
- II Physikalisches Institut, Universität zu Köln , 77 Zülpicher str., 50937 Köln, Germany
- St. Petersburg State University , 7/9 Universitetskaya nab., St. Petersburg 199034, Russia
| | - Andrey Chuvilin
- CIC nanoGUNE Consolider , 76 Tolosa Hiribidea, Donostia-San Sebastian 20018, Spain
- IKERBASQUE Basque Foundation for Science , 3 Maria Diaz de Haro, Bilbao E-48013, Spain
| | - Daniele Pontiroli
- Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma , Parco Area delle Scienze 7/a, 43124 Parma, Italy
| | - Mauro Riccò
- Dipartimento di Scienze Matematiche, Fisiche e Informatiche, Università di Parma , Parco Area delle Scienze 7/a, 43124 Parma, Italy
| | - Lyubov G Bulusheva
- Nikolaev Institute of Inorganic Chemistry SB RAS , 3 Acad. Lavrentiev Avenue, Novosibirsk 630090, Russia
- Novosibirsk State University , 2 Pirogova Street, Novosibirsk 630090, Russia
| | - Alexander V Okotrub
- Nikolaev Institute of Inorganic Chemistry SB RAS , 3 Acad. Lavrentiev Avenue, Novosibirsk 630090, Russia
- Novosibirsk State University , 2 Pirogova Street, Novosibirsk 630090, Russia
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9
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Holmes ST, Bai S, Iuliucci RJ, Mueller KT, Dybowski C. Calculations of solid‐state
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Ca NMR parameters: A comparison of periodic and cluster approaches and an evaluation of DFT functionals. J Comput Chem 2017; 38:949-956. [DOI: 10.1002/jcc.24763] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Revised: 11/29/2016] [Accepted: 01/30/2017] [Indexed: 01/18/2023]
Affiliation(s)
- Sean T. Holmes
- Department of Chemistry and BiochemistryUniversity of DelawareNewark Delaware19716
| | - Shi Bai
- Department of Chemistry and BiochemistryUniversity of DelawareNewark Delaware19716
| | - Robbie J. Iuliucci
- Department of ChemistryWashington and Jefferson CollegeWashington Pennsylvania15301
| | - Karl T. Mueller
- Department of ChemistryPennsylvania State University, University Park Pennsylvania16802
- Physical and Computational Sciences Directorate, Pacific Northwest National LaboratoryRichland Washington99352
| | - Cecil Dybowski
- Department of Chemistry and BiochemistryUniversity of DelawareNewark Delaware19716
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10
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Alkan F, Holmes ST, Iuliucci RJ, Mueller KT, Dybowski C. Spin-orbit effects on the (119)Sn magnetic-shielding tensor in solids: a ZORA/DFT investigation. Phys Chem Chem Phys 2016; 18:18914-22. [PMID: 27354312 DOI: 10.1039/c6cp03807g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Periodic-boundary and cluster calculations of the magnetic-shielding tensors of (119)Sn sites in various co-ordination and stereochemical environments are reported. The results indicate a significant difference between the predicted NMR chemical shifts for tin(ii) sites that exhibit stereochemically-active lone pairs and tin(iv) sites that do not have stereochemically-active lone pairs. The predicted magnetic shieldings determined either with the cluster model treated with the ZORA/Scalar Hamiltonian or with the GIPAW formalism are dependent on the oxidation state and the co-ordination geometry of the tin atom. The inclusion of relativistic effects at the spin-orbit level removes systematic differences in computed magnetic-shielding parameters between tin sites of differing stereochemistries, and brings computed NMR shielding parameters into significant agreement with experimentally-determined chemical-shift principal values. Slight improvement in agreement with experiment is noted in calculations using hybrid exchange-correlation functionals.
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Affiliation(s)
- Fahri Alkan
- Department of Chemistry and Biochemistry, University of Delaware, Newark, DE 19716, USA.
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11
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Holmes ST, Alkan F, Iuliucci RJ, Mueller KT, Dybowski C. Analysis of the bond‐valence method for calculating
29
Si and
31
P magnetic shielding in covalent network solids. J Comput Chem 2016; 37:1704-10. [DOI: 10.1002/jcc.24389] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Revised: 03/14/2016] [Accepted: 03/27/2016] [Indexed: 02/06/2023]
Affiliation(s)
- Sean T. Holmes
- Department of Chemistry and BiochemistryUniversity of DelawareNewark Delaware19716
| | - Fahri Alkan
- Department of Chemistry and BiochemistryUniversity of DelawareNewark Delaware19716
| | - Robbie J. Iuliucci
- Department of ChemistryWashington and Jefferson CollegeWashington Pennsylvania15301
| | - Karl T. Mueller
- Department of ChemistryPennsylvania State UniversityUniversity Park Pennsylvania16802
- Physical and Computational Sciences DirectoratePacific Northwest National LaboratoryRichland Washington99352
| | - Cecil Dybowski
- Department of Chemistry and BiochemistryUniversity of DelawareNewark Delaware19716
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12
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Alkan F, Dybowski C. Effect of Co-Ordination Chemistry and Oxidation State on the (207)Pb Magnetic-Shielding Tensor: A DFT/ZORA Investigation. J Phys Chem A 2015; 120:161-8. [PMID: 26683366 DOI: 10.1021/acs.jpca.5b10991] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The magnetic shielding tensor of (207)Pb is calculated for various solids exhibiting (1) a holodirected lead(II) center containing a stereochemically inactive lone pair, (2) a hemidirected lead(II) center with a stereochemically active lone-pair, or (3) a lead(IV) center. Tensors investigated at the scalar relativistic level are compared with those calculated with the full ZORA/spin-orbit Hamiltonian. The effect of using GGA density functionals is compared to the use of hybrid density functionals.
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Affiliation(s)
- Fahri Alkan
- Department of Chemistry and Biochemistry University of Delaware Newark, Delaware 19716-2522 United States
| | - C Dybowski
- Department of Chemistry and Biochemistry University of Delaware Newark, Delaware 19716-2522 United States
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13
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Holmes ST, Dybowski C. Carbon-13 chemical-shift tensors in indigo: A two-dimensional NMR-ROCSA and DFT Study. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2015; 72:90-95. [PMID: 26344134 PMCID: PMC4894646 DOI: 10.1016/j.ssnmr.2015.08.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2015] [Revised: 08/25/2015] [Accepted: 08/27/2015] [Indexed: 06/05/2023]
Abstract
The principal components of the (13)C NMR chemical-shift tensors for the eight unique carbon sites of crystalline indigo have been measured using the ROCSA pulse sequence. The chemical shifts have been assigned unambiguously to their respective nuclear sites through comparison of the experimental data to the results of density-functional calculations employing a refined X-ray diffraction structure. These measurements expand the database of measured aromatic (13)C chemical-shift tensors to the indole ring. Magnetic shielding calculations for hypoxanthine and adenosine are also reported. Comparisons of calculations that include the effect of the crystalline lattice with calculations that model indigo as an isolated molecule give an estimate of the intermolecular contribution to the magnetic shielding.
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Affiliation(s)
- Sean T Holmes
- Department of Chemistry and Biochemistry, University of Delaware, Newark, DE 19716, USA
| | - Cecil Dybowski
- Department of Chemistry and Biochemistry, University of Delaware, Newark, DE 19716, USA.
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14
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Holmes ST, Iuliucci RJ, Mueller KT, Dybowski C. Critical Analysis of Cluster Models and Exchange-Correlation Functionals for Calculating Magnetic Shielding in Molecular Solids. J Chem Theory Comput 2015; 11:5229-41. [DOI: 10.1021/acs.jctc.5b00752] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sean T. Holmes
- Department
of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Robbie J. Iuliucci
- Department
of Chemistry, Washington and Jefferson College, Washington, Pennsylvania 15301, United States
| | - Karl T. Mueller
- Department
of Chemistry, Pennsylvania State University, University Park, Pennsylvania 16802, United States
- Physical
and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Cecil Dybowski
- Department
of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
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15
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Alkorta I, Elguero J, Pérez-Torralba M, López C, Claramunt RM. A theoretical and experimental study of the NMR spectra of 4,5,6,7-tetrafluorobenzazoles with special stress on PCM calculations of chemical shifts. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2015; 53:353-362. [PMID: 25615404 DOI: 10.1002/mrc.4203] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2014] [Accepted: 12/04/2014] [Indexed: 06/04/2023]
Abstract
The chemical shifts and several (19)F-(19)F, (13)C-(19) F and (1)H-(19)F spin-spin coupling constants (SSCSs) of eight 4,5,6,7-tetraflurobenzazoles (three benzimidazoles, three benzimidazolinones and two indazoles) have been determined. The chemical shifts were discussed using gauge including atomic orbital-density functional theory calculations taking into account solvent effects (polarizable continuum model) and, for the solid state, hydrogen bonds (clusters up to three molecules).
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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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Alkan F, Dybowski C. Chemical-shift tensors of heavy nuclei in network solids: a DFT/ZORA investigation of 207Pb chemical-shift tensors using the bond-valence method. Phys Chem Chem Phys 2015; 17:25014-26. [DOI: 10.1039/c5cp03348a] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Accurate computation of 207Pb magnetic shielding principal components is within the reach of quantum chemistry methods by employing relativistic ZORA/DFT and cluster models adapted from the bond valence model.
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Affiliation(s)
- Fahri Alkan
- Department of Chemistry and Biochemistry
- University of Delaware
- Newark
- USA
| | - C. Dybowski
- Department of Chemistry and Biochemistry
- University of Delaware
- Newark
- USA
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17
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Holmes ST, Iuliucci RJ, Mueller KT, Dybowski C. Density functional investigation of intermolecular effects on 13C NMR chemical-shielding tensors modeled with molecular clusters. J Chem Phys 2014; 141:164121. [DOI: 10.1063/1.4900158] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Affiliation(s)
- Sean T. Holmes
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, USA
| | - Robbie J. Iuliucci
- Department of Chemistry, Washington and Jefferson College, Washington, Pennsylvania 15301, USA
| | - Karl T. Mueller
- Department of Chemistry, Pennsylvania State University, University Park, Pennsylvania 16802, USA
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99352, USA
| | - Cecil Dybowski
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, USA
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Catalano J, Murphy A, Yao Y, Alkan F, Zumbulyadis N, Centeno SA, Dybowski C. 207Pb and 119Sn solid-state NMR and relativistic density functional theory studies of the historic pigment lead-tin yellow type I and its reactivity in oil paintings. J Phys Chem A 2014; 118:7952-8. [PMID: 25144651 DOI: 10.1021/jp505908j] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Lead soaps (lead carboxylates) have been detected in traditional oil paintings in layers containing the pigment lead-tin yellow type I (LTY-I). LTY-I has been used by artists from at least the second quarter of the 15th century until the first half of the 18th century. Soap formation can lead to protrusions in paint layers and increased transparency, causing the paint support to become visible. We have characterized LTY-I by (119)Sn and (207)Pb solid-state NMR (ssNMR) spectroscopy. Using a combination of NMR techniques and DFT molecular cluster calculations, we identify the individual species in LTY-I and determine their (119)Sn and (207)Pb chemical-shift tensors. The presence of starting materials from the synthesis, minium, and tin(IV) oxide was also verified. Knowledge of the chemical-shift tensor components and the impurities in LTY-I is important for examining the chemistry of degradation processes and soap formation. We demonstrate that ssNMR can be used to detect reaction between Pb2SnO4 and added palmitic acid in a model paint sample containing LTY-I.
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Affiliation(s)
- Jaclyn Catalano
- Department of Scientific Research, The Metropolitan Museum of Art , New York, New York 10028, United States
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