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Rossini AJ, Mills RW, Briscoe GA, Norton EL, Geier SJ, Hung I, Zheng S, Autschbach J, Schurko RW. Solid-State Chlorine NMR of Group IV Transition Metal Organometallic Complexes. J Am Chem Soc 2009; 131:3317-30. [DOI: 10.1021/ja808390a] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Aaron J. Rossini
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, and Department of Chemistry, The State University of New York, Buffalo, New York 14260-3000
| | - Ryan W. Mills
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, and Department of Chemistry, The State University of New York, Buffalo, New York 14260-3000
| | - Graham A. Briscoe
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, and Department of Chemistry, The State University of New York, Buffalo, New York 14260-3000
| | - Erin L. Norton
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, and Department of Chemistry, The State University of New York, Buffalo, New York 14260-3000
| | - Stephen J. Geier
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, and Department of Chemistry, The State University of New York, Buffalo, New York 14260-3000
| | - Ivan Hung
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, and Department of Chemistry, The State University of New York, Buffalo, New York 14260-3000
| | - Shaohui Zheng
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, and Department of Chemistry, The State University of New York, Buffalo, New York 14260-3000
| | - Jochen Autschbach
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, and Department of Chemistry, The State University of New York, Buffalo, New York 14260-3000
| | - Robert W. Schurko
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, and Department of Chemistry, The State University of New York, Buffalo, New York 14260-3000
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52
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Thibault MH, Lucier BE, Schurko RW, Fontaine FG. Synthesis and solid-state characterization of platinum complexes with hexadentate amino- and iminophosphine ligands. Dalton Trans 2009:7701-16. [DOI: 10.1039/b907737e] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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53
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Acquisition of ultra-wideline NMR spectra from quadrupolar nuclei by frequency stepped WURST–QCPMG. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2008.12.044] [Citation(s) in RCA: 127] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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54
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Bowmaker GA, Chaichit N, Hanna JV, Pakawatchai C, Skelton BW, White AH. Spectroscopy and structures of two complete families, one mononuclear, the other binuclear, of 1 : 2 CuX : dptu stoichiometry (X = Cl, Br, I; ‘dptu’ = N,N′-diphenylthiourea). Dalton Trans 2009:8308-16. [DOI: 10.1039/b909167j] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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55
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Application of static microcoils and WURST pulses for solid-state ultra-wideline NMR spectroscopy of quadrupolar nuclei. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.10.044] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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56
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O’Dell LA, Schurko RW. QCPMG using adiabatic pulses for faster acquisition of ultra-wideline NMR spectra. Chem Phys Lett 2008. [DOI: 10.1016/j.cplett.2008.08.095] [Citation(s) in RCA: 209] [Impact Index Per Article: 13.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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57
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DeSisto WJ, Cashon R, Cassidy D, Hill N, Ruthven DM, Paine JB, Fournier JA. Preparation and Characterization of a Selective Nitric Oxide Adsorbent Based on Cobalt(II) Phthalocyanine Tetrasulfonic Acid. Ind Eng Chem Res 2008. [DOI: 10.1021/ie8000293] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- W. J. DeSisto
- Department of Chemical and Biological Engineering and the Laboratory for Surface Science and Technology, Jenness Hall, Department of Biochemistry, Microbiology and Molecular Biology, Hitchner Hall, University of Maine, Orono, Maine 04469, and Philip Morris U.S.A. Research Center, P.O. Box 26583, Richmond, Virginia 23261
| | - R. Cashon
- Department of Chemical and Biological Engineering and the Laboratory for Surface Science and Technology, Jenness Hall, Department of Biochemistry, Microbiology and Molecular Biology, Hitchner Hall, University of Maine, Orono, Maine 04469, and Philip Morris U.S.A. Research Center, P.O. Box 26583, Richmond, Virginia 23261
| | - D. Cassidy
- Department of Chemical and Biological Engineering and the Laboratory for Surface Science and Technology, Jenness Hall, Department of Biochemistry, Microbiology and Molecular Biology, Hitchner Hall, University of Maine, Orono, Maine 04469, and Philip Morris U.S.A. Research Center, P.O. Box 26583, Richmond, Virginia 23261
| | - N. Hill
- Department of Chemical and Biological Engineering and the Laboratory for Surface Science and Technology, Jenness Hall, Department of Biochemistry, Microbiology and Molecular Biology, Hitchner Hall, University of Maine, Orono, Maine 04469, and Philip Morris U.S.A. Research Center, P.O. Box 26583, Richmond, Virginia 23261
| | - D. M. Ruthven
- Department of Chemical and Biological Engineering and the Laboratory for Surface Science and Technology, Jenness Hall, Department of Biochemistry, Microbiology and Molecular Biology, Hitchner Hall, University of Maine, Orono, Maine 04469, and Philip Morris U.S.A. Research Center, P.O. Box 26583, Richmond, Virginia 23261
| | - J. B. Paine
- Department of Chemical and Biological Engineering and the Laboratory for Surface Science and Technology, Jenness Hall, Department of Biochemistry, Microbiology and Molecular Biology, Hitchner Hall, University of Maine, Orono, Maine 04469, and Philip Morris U.S.A. Research Center, P.O. Box 26583, Richmond, Virginia 23261
| | - J. A. Fournier
- Department of Chemical and Biological Engineering and the Laboratory for Surface Science and Technology, Jenness Hall, Department of Biochemistry, Microbiology and Molecular Biology, Hitchner Hall, University of Maine, Orono, Maine 04469, and Philip Morris U.S.A. Research Center, P.O. Box 26583, Richmond, Virginia 23261
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58
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Hamaed H, Pawlowski JM, Cooper BF, Fu R, Eichhorn SH, Schurko RW. Application of Solid-State 35Cl NMR to the Structural Characterization of Hydrochloride Pharmaceuticals and their Polymorphs. J Am Chem Soc 2008; 130:11056-65. [DOI: 10.1021/ja802486q] [Citation(s) in RCA: 105] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Hiyam Hamaed
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4 and National High Magnetic Field Laboratory, Tallahassee, Florida 32310-3706
| | - Jenna M. Pawlowski
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4 and National High Magnetic Field Laboratory, Tallahassee, Florida 32310-3706
| | - Benjamin F.T. Cooper
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4 and National High Magnetic Field Laboratory, Tallahassee, Florida 32310-3706
| | - Riqiang Fu
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4 and National High Magnetic Field Laboratory, Tallahassee, Florida 32310-3706
| | - S. Holger Eichhorn
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4 and National High Magnetic Field Laboratory, Tallahassee, Florida 32310-3706
| | - Robert W. Schurko
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4 and National High Magnetic Field Laboratory, Tallahassee, Florida 32310-3706
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Crewdson P, Bryce D, Rominger F, Hofmann P. Application of Ultrahigh-Field59Co Solid-State NMR Spectroscopy in the Investigation of the 1,2-Polybutadiene Catalyst [Co(C8H13)(C4H6)]. Angew Chem Int Ed Engl 2008; 47:3454-7. [DOI: 10.1002/anie.200705204] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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60
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Crewdson P, Bryce D, Rominger F, Hofmann P. Ultrahochfeld-59Co-Festkörper-NMR-Spektroskopie zur Untersuchung des 1,2-Polybutadien-Katalysators [Co(C8H13)(C4H6)]. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200705204] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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61
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Bowmaker GA, Hanna JV, Hahn FE, Lipton AS, Oldham CE, Skelton BW, Smith ME, White AH. Structural and spectroscopic studies of some copper(i) halide tert-butyl isocyanide adducts. Dalton Trans 2008:1710-20. [DOI: 10.1039/b712815k] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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62
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Bhattacharyya R, Frydman L. Quadrupolar nuclear magnetic resonance spectroscopy in solids using frequency-swept echoing pulses. J Chem Phys 2007; 127:194503. [DOI: 10.1063/1.2793783] [Citation(s) in RCA: 98] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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63
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Tang JA, Ellis BD, Warren TH, Hanna JV, Macdonald CLB, Schurko RW. Solid-State 63Cu and 65Cu NMR Spectroscopy of Inorganic and Organometallic Copper(I) Complexes. J Am Chem Soc 2007; 129:13049-65. [DOI: 10.1021/ja073238x] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Joel A. Tang
- Contribution from the Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, Department of Chemistry, Georgetown University, P.O Box 571227, Washington, D.C. 20057-1227, and ANSTO NMR Facility, Materials Division, Australian Nuclear Science and Technology Organisation, Sydney, Australia, NSW, 2234
| | - Bobby D. Ellis
- Contribution from the Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, Department of Chemistry, Georgetown University, P.O Box 571227, Washington, D.C. 20057-1227, and ANSTO NMR Facility, Materials Division, Australian Nuclear Science and Technology Organisation, Sydney, Australia, NSW, 2234
| | - Timothy H. Warren
- Contribution from the Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, Department of Chemistry, Georgetown University, P.O Box 571227, Washington, D.C. 20057-1227, and ANSTO NMR Facility, Materials Division, Australian Nuclear Science and Technology Organisation, Sydney, Australia, NSW, 2234
| | - John V. Hanna
- Contribution from the Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, Department of Chemistry, Georgetown University, P.O Box 571227, Washington, D.C. 20057-1227, and ANSTO NMR Facility, Materials Division, Australian Nuclear Science and Technology Organisation, Sydney, Australia, NSW, 2234
| | - Charles L. B. Macdonald
- Contribution from the Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, Department of Chemistry, Georgetown University, P.O Box 571227, Washington, D.C. 20057-1227, and ANSTO NMR Facility, Materials Division, Australian Nuclear Science and Technology Organisation, Sydney, Australia, NSW, 2234
| | - Robert W. Schurko
- Contribution from the Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4, Department of Chemistry, Georgetown University, P.O Box 571227, Washington, D.C. 20057-1227, and ANSTO NMR Facility, Materials Division, Australian Nuclear Science and Technology Organisation, Sydney, Australia, NSW, 2234
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64
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Tang JA, Masuda JD, Boyle TJ, Schurko RW. Ultra-wideline27Al NMR Investigation of Three- and Five-Coordinate Aluminum Environments. Chemphyschem 2006; 7:117-30. [PMID: 16404763 DOI: 10.1002/cphc.200500343] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Ultra-wideline 27Al NMR experiments are conducted on coordination compounds with 27Al nuclei possessing immense quadrupolar interactions that result from exceptionally nonspherical coordination environments. NMR spectra are acquired using a methodology involving frequency-stepped, piecewise acquisition of NMR spectra with Hahn-echo or quadrupolar Carr-Purcell Meiboom-Gill (QCPMG) pulse sequences, which is applicable to any half-integer quadrupolar nucleus with extremely broad NMR powder patterns. Despite the large breadth of these central transition powder patterns, ranging from 250 to 700 kHz, the total experimental times are an order of magnitude less than previously reported experiments on analogous complexes with smaller quadrupolar interactions. The complexes examined feature three- or five-coordinate aluminum sites: trismesitylaluminum (AlMes3), tris(bis(trimethylsilyl)amino)aluminum (Al(NTMS2)3), bis[dimethyl tetrahydrofurfuryloxide aluminum] ([Me2-Al(mu-OTHF)]2), and bis[diethyl tetrahydrofurfuryloxide aluminum] ([Et2-Al(mu-OTHF)]2). We report some of the largest 27Al quadrupolar coupling constants measured to date, with values of C(Q)(27Al) of 48.2(1), 36.3(1), 19.9(1), and 19.6(2) MHz for AlMes3, Al(NTMS2)3, [Me2-Al(mu-OTHF)]2, and [Et2-Al(mu-OTHF)]2, respectively. X-ray crystallographic data and theoretical (Hartree-Fock and DFT) calculations of 27Al electric field gradient (EFG) tensors are utilized to examine the relationships between the quadrupolar interactions and molecular structure; in particular, the origin of the immense quadrupolar interaction in the three-coordinate species is studied via analyses of molecular orbitals.
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Affiliation(s)
- Joel A Tang
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, N9B 3P4, Canada
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65
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Lo AYH, Bitterwolf TE, Macdonald CLB, Schurko RW. Solid-State 93Nb and 13C NMR Investigations of Half-Sandwich Niobium(I) and Niobium(V) Cyclopentadienyl Complexes. J Phys Chem A 2005; 109:7073-87. [PMID: 16834070 DOI: 10.1021/jp0521499] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Solid-state 93Nb and 13C NMR experiments, in combination with theoretical calculations of NMR tensors, and single-crystal and powder X-ray diffraction experiments, are applied for the comprehensive characterization of structure and dynamics in a series of organometallic niobium complexes. Half-sandwich niobium metallocenes of the forms Cp'Nb(I)(CO)4 and CpNb(V)Cl4 are investigated, where Cp = C5H5- and Cp' = C5H4R- with R = COMe, CO2Me, CO2Et, and COCH2Ph. Anisotropic quadrupolar and chemical shielding (CS) parameters are extracted from 93Nb MAS and static NMR spectra for seven different complexes. It is demonstrated that 93Nb NMR parameters are sensitive to changes in temperature and Cp' ring substitution in the Cp'Nb(I)(CO)4 complexes. There are dramatic differences in the 93Nb quadrupolar coupling constants (C(Q)) between the Nb(I) and Nb(V) complexes, with C(Q) between 1.0 and 12.0 MHz for Cp'Nb(CO)4 and C(Q) = 54.5 MHz for CpNbCl4. The quadrupolar Carr-Purcell Meiboom-Gill (QCPMG) pulse sequence is applied to rapidly acquire, in a piecewise fashion, a high signal-to-noise ultra-wide-line 93Nb NMR spectrum of CpNbCl4, which has a breadth of ca. 400 kHz. Solid-state 93Nb and 13C NMR spectra and powder XRD data are used to identify a new metallocene adduct coordinated at the axial position of the metal site by a THF molecule: CpNb(V)Cl4.THF. 13C MAS and CP/MAS NMR experiments are used to assess the purity of samples, as well as for measuring carbon CS tensors and the rare instance of one-bond 93Nb, 13C J-coupling, 1J(93Nb,13C). Theoretically calculated CS and electric field gradient (EFG) tensors are utilized to determine relationships between tensor orientations, the principal components, and molecular structures.
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Affiliation(s)
- Andy Y H Lo
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4
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66
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Widdifield CM, Schurko RW. A Solid-State 39K and 13C NMR Study of Polymeric Potassium Metallocenes. J Phys Chem A 2005; 109:6865-76. [PMID: 16834043 DOI: 10.1021/jp058059l] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The quadrupolar Carr-Purcell Meiboom-Gill (QCPMG) and double frequency sweep (DFS)/QCPMG pulse sequences are applied in order to acquire the first solid-state 39K NMR spectra of organometallic complexes, the polymeric main group metallocenes cyclopentadienyl potassium (CpK) and pentamethylcyclopentadienyl potassium (Cp*K). Piecewise QCPMG NMR techniques are used to acquire a high S/N 39K spectrum of the broad central transition of Cp*K, which is ca. 200 kHz in breadth. Analytical and numerical simulations indicate that there is a significant quadrupolar interaction present at both potassium nuclei (C(Q)(39K) = 2.55(6)/2.67(8) MHz and 4.69(8) MHz for CpK (static/MAS) and Cp*K, respectively). Experimental quadrupolar asymmetry parameters suggest that both structures are bent about the potassium atoms (eta(Q)(39K) = 0.28(3)/0.29(3) for CpK (static/MAS) and eta(Q)(39K) = 0.30(3) for Cp*K). Variable-temperature (VT) 39K NMR experiments on CpK elucidate temperature-dependent changes in quadrupolar parameters which can be rationalized in terms of alterations of bond distances and angles with temperature. 13C CP/MAS NMR experiments are conducted upon both samples to quantify the carbon chemical shielding anisotropy (CSA) at the Cp' ring carbon atoms. Ab initio carbon CSA and 39K electric-field gradient (EFG) and CSA calculations are conducted and discussed for the CpK complex, in order to correlate the experimental NMR parameters with molecular structure in CpK and Cp*K. 39K DFS/QCPMG and 13C CP/MAS experiments prove invaluable for probing molecular structure, temperature-dependent structural changes, and the presence of impurities in these systems.
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Affiliation(s)
- Cory M Widdifield
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4
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67
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Hung I, Schurko RW. Solid-State 91Zr NMR of Bis(cyclopentadienyl)dichlorozirconium(IV). J Phys Chem B 2004. [DOI: 10.1021/jp040270u] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ivan Hung
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4
| | - Robert W. Schurko
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4
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68
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Lipton AS, Heck RW, Sears JA, Ellis PD. Low temperature solid-state NMR experiments of half-integer quadrupolar nuclides: caveats and data analysis. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2004; 168:66-74. [PMID: 15082250 DOI: 10.1016/j.jmr.2004.01.008] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2003] [Revised: 12/19/2003] [Indexed: 05/24/2023]
Abstract
Solid-state NMR spectroscopy of half-integer quadrupolar nuclides has received a lot of interest recently with the advent of new methodologies and higher magnetic fields. We present here the extension of our previous low temperature method to an 18.8T system. This new probe entailed a total redesign including a cross coil and variable capacitors that are operational at cryogenic temperatures. The limitations to sensitivity are also discussed; including a new diode network, the utilization of a cryogenic band pass filter, and the consequences of the RF profiles of the coil. Further, details of the spectroscopy of quadrupolar nuclei in a protein are discussed, such as the observation of the outer transitions and how to distinguish them from the desired +/-1/2 transition.
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Affiliation(s)
- Andrew S Lipton
- Macromolecular Structure and Dynamics Directorate, WR Wiley Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99352, USA
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Abstract
Over the last decades, NMR spectroscopy has grown into an indispensable tool for chemical analysis, structure determination, and the study of dynamics in organic, inorganic, and biological systems. It is commonly used for a wide range of applications from the characterization of synthetic products to the study of molecular structures of systems such as catalysts, polymers, and proteins. Although most NMR experiments are performed on liquid-state samples, solid-state NMR is rapidly emerging as a powerful method for the study of solid samples and materials. This Review outlines some of the developments of solid-state NMR spectroscopy, including techniques such as cross-polarization, magic-angle spinning, multiple-pulse sequences, homo- and heteronuclear decoupling and recoupling techniques, multiple-quantum spectroscopy, and dynamic angle spinning, as well as their applications to structure determination. Modern solid-state NMR spectroscopic techniques not only produce spectra with a resolution close to that of liquid-state spectra, but also capitalize on anisotropic interactions, which are often unavailable for liquid samples. With this background, the future of solid-state NMR spectroscopy in chemistry appears to be promising, indeed.
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Affiliation(s)
- David D Laws
- Materials Sciences Division, Lawrence Berkeley National Laboratory and Department of Chemistry, University of California at Berkeley, Berkeley, CA 94720, USA
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71
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Geller JM, Wosnick JH, Butler IS, Gilson DFR, Morin FG, Bélanger-Gariépy F. X-ray diffraction, Raman spectroscopic, and solid-state NMR studies of the group 14 metal-(tetracarbonyl)cobalt complexes Ph3MCo(CO)4 (M = Si, Sn, Pb). CAN J CHEM 2002. [DOI: 10.1139/v02-110] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Single-crystal X-ray diffraction studies illustrate that the three title compounds are isomorphous, belonging to the triclinic space group P[Formula: see text], with slightly distorted trigonal bipyramidal geometry about cobalt. The solid-state 29Si, 119Sn, and 207Pb cross-polarization magic angle spinning (CP MAS) NMR spectra are presented. The indirect spinspin coupling constant (J), quadrupolardipolar shift (d), direct dipolar coupling constant (D' ), anisotropy in spinspin coupling (ΔJ), and the chemical shift tensor were extracted. A plot of the reduced coupling constant vs. s-electron densities at the nucleus indicates that the Fermi contact term may be dominant for the tin and lead complexes; however, the large ΔJ for all complexes indicate that there are also significant anisotropic terms. Trends in the Raman scattering spectra are also discussed.Key words: 29Si, 119Sn, and 207Pb CP MAS NMR, tetracarbonyl cobalt, spinspin coupling, chemical shift tensor, quadrupole coupling, Fermi contact, cobaltgroup 14.
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Schurko RW, Wi S, Frydman L. Dynamic Effects on the Powder Line Shapes of Half-Integer Quadrupolar Nuclei: A Solid-State NMR Study of XO4- Groups. J Phys Chem A 2001. [DOI: 10.1021/jp0130214] [Citation(s) in RCA: 89] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Robert W. Schurko
- Department of Chemical Physics, Weizmann Institute, 76100 Rehovot, Israel, and Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607
| | - Sungsool Wi
- Department of Chemical Physics, Weizmann Institute, 76100 Rehovot, Israel, and Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607
| | - Lucio Frydman
- Department of Chemical Physics, Weizmann Institute, 76100 Rehovot, Israel, and Department of Chemistry, University of Illinois at Chicago, Chicago, Illinois 60607
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Nielsen UG, Jakobsen HJ, Skibsted J. 59Co chemical shift anisotropy and quadrupole coupling for K3Co(CN)6 from MQMAS and MAS NMR spectroscopy. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2001; 20:23-34. [PMID: 11529417 DOI: 10.1006/snmr.2001.0027] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
59Co triple-quantum (3Q) MAS and single-pulse MAS NMR spectra of K3Co(CN)6 have been obtained at 14.1 T and used in a comparison of these methods for determination of small chemical shift anisotropies for spin I = 7/2 nuclei. From the 3QMAS NMR spectrum a spinning sideband manifold in the isotropic dimension with high resolution is reconstructed from the intensities of all spinning sidebands in the 3QMAS spectrum. The chemical shift anisotropy (CSA) parameters determined from this spectrum are compared with those obtained from MAS NMR spectra of (i) the complete manifold of spinning sidebands for the central and satellite transitions and of (ii) the second-order quadrupolar lineshapes for the centerband and spinning sidebands from the central transition. A good agreement between the three data sets, all of high precision, is obtained for the shift anisotropy (delta(sigma) = delta(iso) - delta(zz)) whereas minor deviations are observed for the CSA asymmetry parameter (eta(sigma)). The temperature dependence of the isotropic 59Co chemical shift has been studied over a temperature range from -28 to +76 degrees C. A linear and positive temperature dependence of 0.97 ppm/degree C is observed.
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Affiliation(s)
- U G Nielsen
- Instrument Centre for Solid-State NMR Spectroscopy, Department of Chemistry, University of Aarhus, Denmark
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Grinshtein J, McElheny D, Frydman V, Frydman L. A variable-director 13C NMR analysis of lyotropic aramide solutions. J Chem Phys 2001. [DOI: 10.1063/1.1349706] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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75
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Kirby CW, Power WP. Cobalt-59 chemical shift and quadrupolar tensors of simple octahedral cobalt(III) complexes. CAN J CHEM 2001. [DOI: 10.1139/v01-025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Analysis of the solid-state powder 59Co NMR spectra of ten simple inorganic cobalt(III) complexes at 11.75, and in most cases, 4.7 T have permitted the assignment of specific ligand planes to ranges of values of the observed chemical shift principal components. The relevant chemical shift components were determined from the simulations of the powder line shapes. These simulations also provided the relative orientations of the chemical shift (CS) and electric field gradient (efg) tensors, as well as magnitude and asymmetry of the 59Co quadrupolar coupling. Using symmetry arguments and ab initio calculations, as appropriate or necessary, the orientations of the efg tensors in the molecular frame were deduced. This allowed the determination of the CS tensors in the molecular frame and thus assignment of the ligand planes responsible for the observed values of chemical shifts.Key words: cobalt, chemical shift, quadrupolar coupling, solid state NMR.
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McElheny D, Zhou M, Frydman L. Two-dimensional dynamic-director (13)C NMR of liquid crystals. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2001; 148:436-441. [PMID: 11237650 DOI: 10.1006/jmre.2000.2254] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A novel nuclear magnetic resonance (NMR) experiment for facilitating the resolution and assignment of liquid crystalline (13)C NMR spectra is described. The method involves the motor-driven reorientation of the liquid crystalline director, in synchrony with the acquisition of a 2D chemical shift correlation spectrum. By monitoring in this fashion the (13)C NMR evolution of spins in the liquid crystal at two different director orientations with respect to the magnetic field, the method distinguishes anisotropic from isotropic displacements and can be utilized for assigning the resonances and estimating local degrees of order. Of various potential pairs of angles suitable for such a correlation, the (0 degrees, 90 degrees ) choice was found to be most convenient, as it avoids line broadening complications that may otherwise originate from heterogeneities of the oriented phase. The technique thus derived was employed in the analysis of a series of monomeric and polymeric liquid crystal systems.
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Affiliation(s)
- D McElheny
- Department of Chemistry (M/C 111), University of Illinois at Chicago, 845 W. Taylor Street, Chicago, Illinois 60607-7061, USA
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Medek A, Frydman L. A Multinuclear Solid-State NMR Analysis of Vitamin B12 in Its Different Polymorphic Forms. J Am Chem Soc 2000. [DOI: 10.1021/ja992939u] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ales Medek
- Contribution from the Department of Chemistry (M/C 111), University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607-7061
| | - Lucio Frydman
- Contribution from the Department of Chemistry (M/C 111), University of Illinois at Chicago, 845 West Taylor Street, Chicago, Illinois 60607-7061
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