1
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Hope MA, Cordova M, Mishra A, Gunes U, Caiazzo A, Datta K, Janssen RAJ, Emsley L. Axial-Equatorial Halide Ordering in Layered Hybrid Perovskites from Isotropic-Anisotropic 207 Pb NMR. Angew Chem Int Ed Engl 2024; 63:e202314856. [PMID: 38305510 DOI: 10.1002/anie.202314856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Revised: 02/01/2024] [Accepted: 02/02/2024] [Indexed: 02/03/2024]
Abstract
Bandgap-tuneable mixed-halide 3D perovskites are of interest for multi-junction solar cells, but suffer from photoinduced spatial halide segregation. Mixed-halide 2D perovskites are more resistant to halide segregation and are promising coatings for 3D perovskite solar cells. The properties of mixed-halide compositions depend on the local halide distribution, which is challenging to study at the level of single octahedra. In particular, it has been suggested that there is a preference for occupation of the distinct axial and equatorial halide sites in mixed-halide 2D perovskites. 207 Pb NMR can be used to probe the atomic-scale structure of lead-halide materials, but although the isotropic 207 Pb shift is sensitive to halide stoichiometry, it cannot distinguish configurational isomers. Here, we use 2D isotropic-anisotropic correlation 207 Pb NMR and relativistic DFT calculations to distinguish the [PbX6 ] configurations in mixed iodide-bromide 3D FAPb(Br1-x Ix )3 perovskites and 2D BA2 Pb(Br1-x Ix )4 perovskites based on formamidinium (FA+ ) and butylammonium (BA+ ), respectively. We find that iodide preferentially occupies the axial site in BA-based 2D perovskites, which may explain the suppressed halide mobility.
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Affiliation(s)
- Michael A Hope
- Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015, Lausanne, Switzerland
| | - Manuel Cordova
- Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015, Lausanne, Switzerland
| | - Aditya Mishra
- Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015, Lausanne, Switzerland
| | - Ummugulsum Gunes
- Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015, Lausanne, Switzerland
| | - Alessandro Caiazzo
- Molecular Materials and Nanosystems, Institute of Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
| | - Kunal Datta
- Molecular Materials and Nanosystems, Institute of Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
| | - René A J Janssen
- Molecular Materials and Nanosystems, Institute of Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands
| | - Lyndon Emsley
- Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL), CH-1015, Lausanne, Switzerland
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2
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Cairns KR, King RP, Bannister RD, Levason W, Reid G. Synthesis, spectroscopic and structural properties of Sn(II) and Pb(II) triflate complexes with soft phosphine and arsine coordination. Dalton Trans 2023; 52:2293-2308. [PMID: 36723113 DOI: 10.1039/d2dt03687h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Reaction of the divalent M(OTf)2 (M = Sn, Pb; OTf = CF3SO3) with soft phosphine and arsine ligands, L, where L = o-C6H4(ER2)2 (E = P, R = Me or Ph; E = As, R = Me), MeC(CH2ER2)3 (E = P, R = Ph; E = As, R = Me), PhP(CH2CH2PPh2)2 or P(CH2CH2PPh2)3, affords complexes of stoichiometry M(L)(OTf)2 as white powders, which have been characterised via elemental analysis, 1H, 19F{1H}, 31P{1H} and 119Sn NMR spectroscopy, with the expected 31P-119Sn and 31P-207Pb couplings clearly evident. The crystal structures of nine of these pnictine complexes are reported, in each case revealing retention of one or both OTf anions, which gives rise to a diverse range of coordination environments including monomers, as well as varying degrees of oligomerisation to form weakly associated (OTf-bridged) dimers, trimers and polymers. 19F{1H} NMR spectra indicate that the OTf is essentially anionic (dissociated) in solution. Anion metathesis of [M(OTf)2{MeC(CH2PPh2)3}] with Na[BArF] (BArF = B{3,5-(CF3)2C6H3}4) yields the corresponding [M{MeC(CH2PPh2)3}][BArF]2 salts, the crystal structures of all three (M = Ge, Sn, Pb) reveal pyramidal dications with discrete [BArF]- anions providing charge balance. Density functional theory (DFT) calculations on these [M{MeC(CH2PPh2)3}]2+ (M = Ge, Sn, Pb) dications using the B3LYP-D3 functional show the presence of a directional lone pair, which is a mixture of valence s and pz character, with the valence p-orbital character decreasing down group 14. Natural bond orbital (NBO) analysis also shows that the natural charge at the metal centre increases and the charge on the P centre decreases upon going down group 14.
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Affiliation(s)
- Kelsey R Cairns
- School of Chemistry, University of Southampton, Southampton SO17 1BJ, UK.
| | - Rhys P King
- School of Chemistry, University of Southampton, Southampton SO17 1BJ, UK.
| | - Robert D Bannister
- School of Chemistry, University of Southampton, Southampton SO17 1BJ, UK.
| | - William Levason
- School of Chemistry, University of Southampton, Southampton SO17 1BJ, UK.
| | - Gillian Reid
- School of Chemistry, University of Southampton, Southampton SO17 1BJ, UK.
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3
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Chandran A, Léon Baeza JM, Timofeeva V, Nougué R, Takahashi S, Ohno R, Baceiredo A, Rojas Guerrero RS, Syroeshkin M, Matsuo T, Saffon-Merceron N, Kato T. Lewis Base Adducts of Phosphine-Stabilized Pb(II) Cations: Synthesis and Catalytic Hydroamination of Alkynes. Inorg Chem 2022; 61:16156-16162. [PMID: 36174242 DOI: 10.1021/acs.inorgchem.2c02727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Phosphine-stabilized Pb(II) cations, generated by chloride abstraction from chloroplumbylene 1, readily react with Lewis bases (L) such as phosphines and amines to give the corresponding donor-acceptor complexes 3. These complexes 3 react with phenylacetlylene via alkyne insertion into the Pb-L bond to afford the corresponding vinylplumbylenes 4. Of particular interest, the stable complex 4-HNiPr2 (with a secondary amine) can be used as a hydroamination catalyst of phenylacetylene.
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Affiliation(s)
- Aswin Chandran
- Laboratoire Hétérochimie Fondamentale et Appliquée (UMR 5069), Université de Toulouse, CNRS, 118 route de Narbonne, F-31062 Toulouse, France
| | - José Miguel Léon Baeza
- Laboratoire Hétérochimie Fondamentale et Appliquée (UMR 5069), Université de Toulouse, CNRS, 118 route de Narbonne, F-31062 Toulouse, France.,Departamento de Química Inorganica, Facultad de Química, Pontificia Universidad Catolica de Chile, Casilla 306, Santiago 3580000, Chile
| | - Vladislava Timofeeva
- Laboratoire Hétérochimie Fondamentale et Appliquée (UMR 5069), Université de Toulouse, CNRS, 118 route de Narbonne, F-31062 Toulouse, France.,N. D. Zelinsky Institute of Organic Chemistry, Leninsky prosp. 47, 119991 Moscow, Russia
| | - Raphael Nougué
- Laboratoire Hétérochimie Fondamentale et Appliquée (UMR 5069), Université de Toulouse, CNRS, 118 route de Narbonne, F-31062 Toulouse, France
| | - Shintaro Takahashi
- Laboratoire Hétérochimie Fondamentale et Appliquée (UMR 5069), Université de Toulouse, CNRS, 118 route de Narbonne, F-31062 Toulouse, France
| | - Ryoma Ohno
- Department of Applied Chemistry, Faculty of Science and Engineering, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan
| | - Antoine Baceiredo
- Laboratoire Hétérochimie Fondamentale et Appliquée (UMR 5069), Université de Toulouse, CNRS, 118 route de Narbonne, F-31062 Toulouse, France
| | - Rene Segundo Rojas Guerrero
- Departamento de Química Inorganica, Facultad de Química, Pontificia Universidad Catolica de Chile, Casilla 306, Santiago 3580000, Chile
| | - Mikhail Syroeshkin
- N. D. Zelinsky Institute of Organic Chemistry, Leninsky prosp. 47, 119991 Moscow, Russia
| | - Tsukasa Matsuo
- Department of Applied Chemistry, Faculty of Science and Engineering, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan
| | - Nathalie Saffon-Merceron
- Institut de Chimie de Toulouse (UAR 2599), Université de Toulouse, CNRS, 118 route de Narbonne, F-31062 Toulouse, France
| | - Tsuyoshi Kato
- Laboratoire Hétérochimie Fondamentale et Appliquée (UMR 5069), Université de Toulouse, CNRS, 118 route de Narbonne, F-31062 Toulouse, France
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4
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Guthardt R, Blanckenberg J, Bruhn C, Siemeling U. Planar-chiral 1,1'-diaminoferrocenes. Chem Commun (Camb) 2021; 57:12984-12987. [PMID: 34792053 DOI: 10.1039/d1cc05287j] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Planar-chiral homologues of 1,1'-diaminoferrocene, which bear a single additional substituent adjacent to one of the amino groups, are prepared as racemic mixtures in a few steps and in good yields from ferrocene. Various substituents relevant to steric shielding, coordination and further functionalisation are used, giving access to ferrocene-based planar-chiral diimines and diamines as well as stable N-heterocyclic carbenes and tetrylenes by transformations analogous to procedures established for 1,1'-diaminoferrocene.
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Affiliation(s)
- Robin Guthardt
- Institut für Chemie, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany.
| | - Johannes Blanckenberg
- Institut für Chemie, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany.
| | - Clemens Bruhn
- Institut für Chemie, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany.
| | - Ulrich Siemeling
- Institut für Chemie, Universität Kassel, Heinrich-Plett-Straße 40, 34132 Kassel, Germany.
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5
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Liu JL, Hu F, Sheng MM, Jia AQ, Zhang QF. Synthesis and Structural Characterization of Lead(II)-halide Complexes with Thiolate Ligands. J CLUST SCI 2021. [DOI: 10.1007/s10876-020-01872-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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6
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Aman M, Dostál L, Mikysek T, Růžičková Z, Mebs S, Beckmann J, Jambor R. Study of Donor–Acceptor Bonds on the
N
‐Coordinated Sn/Pb(II) Atoms in
peri
‐Substituted Naphthalenes: Evidence of Pb→B Interaction. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000696] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Michal Aman
- Department of General and Inorganic Chemistry University of Pardubice 532 10 Pardubice Czech Republic
| | - Libor Dostál
- Department of General and Inorganic Chemistry University of Pardubice 532 10 Pardubice Czech Republic
| | - Tomáš Mikysek
- Department of Analytical Chemistry University of Pardubice 532 10 Pardubice Czech Republic
| | - Zdenka Růžičková
- Department of General and Inorganic Chemistry University of Pardubice 532 10 Pardubice Czech Republic
| | - Stefan Mebs
- Institut für Experimentalphysik Freie Universität Berlin Arnimallee 14 14195 Berlin Germany
| | - Jens Beckmann
- Institut für Anorganische Chemie und Kristallographie Universität Bremen Leobener Straße 7 28359 Bremen Germany
| | - Roman Jambor
- Department of General and Inorganic Chemistry University of Pardubice 532 10 Pardubice Czech Republic
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7
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Affiliation(s)
- Sebastian Weiß
- Institut für Anorganische Chemie, Eberhard-Karls-Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany
| | - Maximilian Auer
- Institut für Anorganische Chemie, Eberhard-Karls-Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany
| | - Klaus Eichele
- Institut für Anorganische Chemie, Eberhard-Karls-Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany
| | - Hartmut Schubert
- Institut für Anorganische Chemie, Eberhard-Karls-Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany
| | - Lars Wesemann
- Institut für Anorganische Chemie, Eberhard-Karls-Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany
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8
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Aamir M, Khan MD, Sher M, Bhosale SV, Malik MA, Akhtar J, Revaprasadu N. A Facile Route to Cesium Lead Bromoiodide Perovskite Microcrystals and Their Potential Application as Sensors for Nitrophenol Explosives. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700660] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Muhammad Aamir
- Department of Chemistry; University of Zululand; Private Bag X1001 3886 Kwadlangezwa South Africa
- Department of Chemistry; Allama Iqbal Open University; Islamabad Pakistan
| | - Malik Dilshad Khan
- Department of Chemistry; University of Zululand; Private Bag X1001 3886 Kwadlangezwa South Africa
| | - Muhammad Sher
- Department of Chemistry; Allama Iqbal Open University; Islamabad Pakistan
| | | | - Mohammad Azad Malik
- Department of Chemistry; University of Zululand; Private Bag X1001 3886 Kwadlangezwa South Africa
- School of Materials; The University of Manchester; Oxford Road M13 9PL Manchester United Kingdom
| | - Javeed Akhtar
- Department of Physics; Polymers & Materials Synthesis (PMS) Lab COMSATS; Institute of Information Technology (CIIT); Chak Shahzad Islamabad Pakistan
| | - Neerish Revaprasadu
- Department of Chemistry; University of Zululand; Private Bag X1001 3886 Kwadlangezwa South Africa
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9
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Veinberg SL, Lindquist AW, Jaroszewicz MJ, Schurko RW. Practical considerations for the acquisition of ultra-wideline 14N NMR spectra. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2017; 84:45-58. [PMID: 28130009 DOI: 10.1016/j.ssnmr.2016.12.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Revised: 12/20/2016] [Accepted: 12/20/2016] [Indexed: 06/06/2023]
Abstract
Several considerations for the acquisition, processing, and analysis of high quality ultra-wideline (UW) 14N solid-state NMR (SSNMR) powder patterns under static conditions are discussed. It is shown that the 14N quadrupolar parameters may be determined accurately using the frequencies of only two discontinuities in 14N NMR powder patterns that are dominated by the first-order quadrupolar interaction, thereby eliminating the need for the acquisition of the entire pattern and concomitantly reducing experimental time. A framework for utilizing the WURST-CPMG pulse sequence to improve the efficiency of UW 14N SSNMR experiments is explored in two parts: (i) a systematic investigation of the design and parameterization of the WURST pulse is presented, and (ii) the development of the practical aspects of CPMG refocusing for the acquisition of UW 14N SSNMR powder patterns is discussed, with a focus on maximizing both signal-to-noise and resolution, and minimizing spectral distortions. Finally, a strategy is demonstrated that allows for the measurement of the 14N quadrupolar parameters for any nitrogen moiety whose quadrupolar coupling constant falls within the range 0.8≤|CQ|≤1.5MHz, by acquiring only two 14N NMR sub-spectra at strategically located transmitter frequencies; these results are compared to full powder patterns which are acquired using frequency-stepped methods. The methodologies and practical considerations outlined herein are not only useful for the rapid acquisition of UW 14N NMR spectra, but may also be modified and applied for UW NMR of a plethora of quadrupolar and spin-1/2 nuclides.
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Affiliation(s)
- Stanislav L Veinberg
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4
| | - Austin W Lindquist
- Department of Chemistry and Biochemistry, University of Windsor, Windsor, Ontario, Canada N9B 3P4
| | - Michael J Jaroszewicz
- 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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10
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Southern SA, Errulat D, Frost JM, Gabidullin B, Bryce DL. Prospects for 207Pb solid-state NMR studies of lead tetrel bonds. Faraday Discuss 2017; 203:165-186. [DOI: 10.1039/c7fd00087a] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The feasibility and value of 207Pb solid-state NMR experiments on compounds featuring lead tetrel bonds is explored. Although the definition remains to be formalized, lead tetrel bonds may be qualitatively described as existing when there is evidence of a net attractive interaction between an electrophilic region associated with lead in a molecular entity and a nucleophilic region in another, or the same, molecular entity. Unambiguous identification of lead tetrel bonds can be challenging due to the hypervalent tendency of lead. We report here a series of 207Pb solid-state NMR experiments on five metal–organic frameworks featuring lead coordinated to hydrazone-based ligands. Such frameworks may be held together in part by lead tetrel bonds. The acquisition of 207Pb solid-state NMR spectra for such materials is feasible and is readily accomplished using a combination of magic-angle spinning and Carr–Purcell–Meiboom–Gill methods in moderate to low applied magnetic fields. The lead centres are characterized by 207Pb isotropic chemical shifts ranging from −426 to −2591 ppm and chemical shift tensor spans ranging from 910 to 2681 ppm. Careful inspection of the structures of the compounds and the literature 207Pb NMR data may suggest that a tetrel bond to lead results in chemical shift parameters which are intermediate between those which are characteristic of holodirected and hemidirected lead coordination geometries. Challenges associated with DFT computations of the 207Pb NMR parameters are discussed. In summary, the 207Pb data for the compounds studied herein show a marked response to the presence of non-coordinating electron-rich moieties in close contact with the electrophilic surface of formally hemidirectionally coordinated lead compounds.
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Affiliation(s)
- Scott A. Southern
- Department of Chemistry and Biomolecular Sciences
- Centre for Catalysis Research and Innovation
- University of Ottawa
- Ottawa
- Canada
| | - Dylan Errulat
- Department of Chemistry and Biomolecular Sciences
- Centre for Catalysis Research and Innovation
- University of Ottawa
- Ottawa
- Canada
| | - Jamie M. Frost
- Department of Chemistry and Biomolecular Sciences
- Centre for Catalysis Research and Innovation
- University of Ottawa
- Ottawa
- Canada
| | - Bulat Gabidullin
- Department of Chemistry and Biomolecular Sciences
- Centre for Catalysis Research and Innovation
- University of Ottawa
- Ottawa
- Canada
| | - David L. Bryce
- Department of Chemistry and Biomolecular Sciences
- Centre for Catalysis Research and Innovation
- University of Ottawa
- Ottawa
- Canada
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11
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Ruckthong L, Zastrow ML, Stuckey JA, Pecoraro VL. A Crystallographic Examination of Predisposition versus Preorganization in de Novo Designed Metalloproteins. J Am Chem Soc 2016; 138:11979-88. [PMID: 27532255 PMCID: PMC5242185 DOI: 10.1021/jacs.6b07165] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Preorganization and predisposition are important molecular recognition concepts exploited by nature to obtain site-specific and selective metal binding to proteins. While native structures containing an MS3 core are often unavailable in both apo- and holo-forms, one can use designed three-stranded coiled coils (3SCCs) containing tris-thiolate sites to evaluate these concepts. We show that the preferred metal geometry dictates the degree to which the cysteine rotamers change upon metal complexation. The Cys ligands in the apo-form are preorganized for binding trigonal pyramidal species (Pb(II)S3 and As(III)S3) in an endo conformation oriented toward the 3SCC C-termini, whereas the cysteines are predisposed for trigonal planar Hg(II)S3 and 4-coordinate Zn(II)S3O structures, requiring significant thiol rotation for metal binding. This study allows assessment of the importance of protein fold and side-chain reorientation for achieving metal selectivity in human retrotransposons and metalloregulatory proteins.
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Affiliation(s)
- Leela Ruckthong
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
- Biophysics Program, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Melissa L. Zastrow
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Jeanne A. Stuckey
- Life Sciences Institute, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Vincent L. Pecoraro
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, United States
- Biophysics Program, University of Michigan, Ann Arbor, Michigan 48109, United States
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12
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Peng B, Shen M, Amoureux JP, Hu B. Elimination of the baseline distortions in WURST-CPMG static experiments. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2016; 78:1-4. [PMID: 27317974 DOI: 10.1016/j.ssnmr.2016.05.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Revised: 04/21/2016] [Accepted: 05/19/2016] [Indexed: 06/06/2023]
Abstract
The WURST-CPMG pulse sequence enables: (i) observing very broad spectra due to WURST excitation, and (ii) increasing the S/N ratio due to CPMG acquisition. However, strong baseline distortions may be observed, which make the extraction of the tensor information difficult. We propose a slight modification of the sequence, WURST-CPMGM, in which we skip the first M echoes and we only acquire the following ones. This simple treatment mostly eliminates the strong background signal and the ring down effects, leading to a flat baseline.
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Affiliation(s)
- Bo Peng
- School of Physics and Materials Science & Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai 200062, China
| | - Ming Shen
- School of Physics and Materials Science & Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai 200062, China
| | - Jean-Paul Amoureux
- School of Physics and Materials Science & Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai 200062, China; UCCS, Lille North of France University, Villeneuve d'Ascq 59652, France
| | - Bingwen Hu
- School of Physics and Materials Science & Shanghai Key Laboratory of Magnetic Resonance, East China Normal University, Shanghai 200062, China.
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13
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Schneider J, Krebs KM, Freitag S, Eichele K, Schubert H, Wesemann L. Intramolecular Tetrylene Lewis Adducts: Synthesis and Reactivity. Chemistry 2016; 22:9812-26. [DOI: 10.1002/chem.201601224] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Julia Schneider
- Institut für Anorganische Chemie; Universität Tübingen; Auf der Morgenstelle 18 72076 Tübingen Germany
| | - Kilian M. Krebs
- Institut für Anorganische Chemie; Universität Tübingen; Auf der Morgenstelle 18 72076 Tübingen Germany
| | - Sarah Freitag
- Institut für Anorganische Chemie; Universität Tübingen; Auf der Morgenstelle 18 72076 Tübingen Germany
| | - Klaus Eichele
- Institut für Anorganische Chemie; Universität Tübingen; Auf der Morgenstelle 18 72076 Tübingen Germany
| | - Hartmut Schubert
- Institut für Anorganische Chemie; Universität Tübingen; Auf der Morgenstelle 18 72076 Tübingen Germany
| | - Lars Wesemann
- Institut für Anorganische Chemie; Universität Tübingen; Auf der Morgenstelle 18 72076 Tübingen Germany
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14
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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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15
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Burt J, Grantham W, Levason W, Reid G. Lead(II) nitrate and hexafluorosilicate complexes with neutral diphosphine coordination. Dalton Trans 2015; 44:11533-41. [PMID: 26032305 DOI: 10.1039/c5dt01448d] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Rare examples of phosphine complexes of lead(II) are reported. The reaction of Pb(NO3)2 with Me2P(CH2)2PMe2, o-C6H4(PMe2)2 or Et2P(CH2)2PEt2 (L-L) in H2O/MeCN gave white [Pb(L-L)(NO3)2], irrespective of the ratio of reagents used. The X-ray structures of [Pb{Me2P(CH2)2PMe2}(NO3)2] and [Pb{o-C6H4(PMe2)2}(NO3)2] reveal chelating diphosphines and κ(2)-NO3(-) groups occupying one hemisphere about the lead centre with single oxygen bridges to two further nitrate groups from neighbouring molecules completing a distorted eight-coordinate geometry. Using Pb(SiF6)·2H2O produced [Pb{o-C6H4(PMe2)2}(H2O)(SiF6)]·H2O which has a chelating diphosphine, the water molecule and a coordinated SiF6(2-) group (which could be described as either κ(1)- or asymmetric κ(3)-coordinated to the lead), with further Pb-F interactions to neighbouring molecules producing a chain polymer structure. The structure of [Pb{o-C6H4(PMe2)2}(DMF)2(SiF6)]·DMF was also determined and contains dimers with fluorosilicate bridges. Adventitious oxygen readily form diphosphine dioxide complexes, and the structures of [Pb{Et2(O)P(CH2)2P(O)Et2}2(NO3)2] and [Pb{Me2P(CH2)2PMe2}{Me2(O)P(CH2)2P(O)Me2}][BF4]2·½MeNO2 produced in this way were determined. The former contains eight-coordinate lead with κ(2)-NO3(-) groups and bridging diphosphine dioxides, which results in an infinite polymer. In the latter the diphosphine is chelated but the diphosphine dioxide bridges between Pb(ii) centres, with coordinated BF4(-) groups completing a very distorted ten-coordinate moiety. Attempts to isolate similar complexes with o-C6H4(PPh2)2 or o-C6H4(AsMe2)2 were unsuccessful.
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Affiliation(s)
- Jennifer Burt
- School of Chemistry, University of Southampton, Southampton SO17 1BJ, UK.
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Taylor MJ, Coakley EJ, Coles MP, Cox H, Fulton JR. β-Diketiminato Organolead Complexes: Structures, 207Pb NMR, and Hammett Correlations. Organometallics 2015. [DOI: 10.1021/om501223a] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Morgan J. Taylor
- Department of Chemistry, University of Sussex,
Falmer, Brighton BN1 9RH, U.K
| | - Emma J. Coakley
- Department of Chemistry, University of Sussex,
Falmer, Brighton BN1 9RH, U.K
| | - Martyn P. Coles
- Department of Chemistry, University of Sussex,
Falmer, Brighton BN1 9RH, U.K
| | - Hazel Cox
- Department of Chemistry, University of Sussex,
Falmer, Brighton BN1 9RH, U.K
| | - J. Robin Fulton
- Department of Chemistry, University of Sussex,
Falmer, Brighton BN1 9RH, U.K
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17
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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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18
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Berenguer JR, Lalinde E, Martín A, Moreno MT, Ruiz S, Sánchez S, Shahsavari HR. Photophysical Responses in Pt2Pb Clusters Driven by Solvent Interactions and Structural Changes in the PbII Environment. Inorg Chem 2014; 53:8770-85. [DOI: 10.1021/ic501458q] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Jesús R. Berenguer
- Departamento de
Quı́mica-Centro de Sı́ntesis Quı́mica
de La Rioja (CISQ), Universidad de La Rioja, Madre de Dios, 51, 26006 Logroño, Spain
| | - Elena Lalinde
- Departamento de
Quı́mica-Centro de Sı́ntesis Quı́mica
de La Rioja (CISQ), Universidad de La Rioja, Madre de Dios, 51, 26006 Logroño, Spain
| | - Antonio Martín
- Departamento de Quı́mica Inorgánica,
Instituto de Ciencia de Materiales de Aragón, Facultad de Ciencias, Universidad de Zaragoza-CSIC, Plaza S. Francisco s/n 50009 Zaragoza, Spain
| | - M. Teresa Moreno
- Departamento de
Quı́mica-Centro de Sı́ntesis Quı́mica
de La Rioja (CISQ), Universidad de La Rioja, Madre de Dios, 51, 26006 Logroño, Spain
| | - Santiago Ruiz
- Departamento de
Quı́mica-Centro de Sı́ntesis Quı́mica
de La Rioja (CISQ), Universidad de La Rioja, Madre de Dios, 51, 26006 Logroño, Spain
| | - Sergio Sánchez
- School of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Hamid R. Shahsavari
- Departamento de
Quı́mica-Centro de Sı́ntesis Quı́mica
de La Rioja (CISQ), Universidad de La Rioja, Madre de Dios, 51, 26006 Logroño, Spain
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19
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Alkan F, Dybowski C. Calculation of chemical-shift tensors of heavy nuclei: a DFT/ZORA investigation of 199Hg chemical-shift tensors in solids, and the effects of cluster size and electronic-state approximations. Phys Chem Chem Phys 2014; 16:14298-308. [DOI: 10.1039/c4cp01682c] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A ZORA/DFT investigation of the NMR chemical shielding of a suite of 199Hg-containing solid materials shows the importance of calculations with the molecular-cluster method.
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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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20
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Saito M, Akiba T, Kaneko M, Kawamura T, Abe M, Hada M, Minoura M. Synthesis, Structure, and Reactivity of Lewis Base Stabilized Plumbacyclopentadienylidenes. Chemistry 2013; 19:16946-53. [DOI: 10.1002/chem.201303672] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2013] [Indexed: 11/06/2022]
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21
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O'Dell LA. The WURST kind of pulses in solid-state NMR. SOLID STATE NUCLEAR MAGNETIC RESONANCE 2013; 55-56:28-41. [PMID: 24183812 DOI: 10.1016/j.ssnmr.2013.10.003] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Revised: 10/07/2013] [Accepted: 10/07/2013] [Indexed: 06/02/2023]
Abstract
WURST pulses (wideband, uniform rate, smooth truncation) were first introduced two decades ago by Kupče and Freeman as a means of achieving broadband adiabatic inversion of magnetisation for solution-state (13)C decoupling at high magnetic field strengths. In more recent years these pulses have found use in an increasingly diverse range of applications in solid-state NMR. This article reviews a number of recent developments that take advantage of WURST pulses, including broadband excitation, refocusing and cross polarisation for the acquisition of ultra-wideline powder patterns, signal enhancement for half-integer and integer spin quadrupolar nuclei, spectral editing, direct and indirectly observed (14)N overtone MAS, and symmetry-based homonuclear recoupling. Simple mathematical descriptions of WURST pulses and some brief theory behind their operation in the adiabatic and non-adiabatic regimes are provided, and various practical considerations for their use are also discussed.
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Affiliation(s)
- Luke A O'Dell
- Institute for Frontier Materials, Deakin University, Waurn Ponds Campus, Geelong, Victoria 3220, Australia.
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