51
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Shova S, Vlad A, Cazacu M, Krzystek J, Ozarowski A, Malček M, Bucinsky L, Rapta P, Cano J, Telser J, Arion VB. Dinuclear manganese(iii) complexes with bioinspired coordination and variable linkers showing weak exchange effects: a synthetic, structural, spectroscopic and computation study. Dalton Trans 2019; 48:5909-5922. [DOI: 10.1039/c8dt04596h] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
High-resolution HFEPR indicates weak exchange interactions between MnIII ions in agreement with DFT calculations.
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Affiliation(s)
- Sergiu Shova
- Inorganic Polymers Department
- “Petru Poni” Institute of Macromolecular Chemistry
- Iasi 700487
- Romania
| | - Angelica Vlad
- Inorganic Polymers Department
- “Petru Poni” Institute of Macromolecular Chemistry
- Iasi 700487
- Romania
| | - Maria Cazacu
- Inorganic Polymers Department
- “Petru Poni” Institute of Macromolecular Chemistry
- Iasi 700487
- Romania
| | - J. Krzystek
- National High Magnetic Field Laboratory
- Florida State University
- Tallahassee
- USA
| | - Andrew Ozarowski
- National High Magnetic Field Laboratory
- Florida State University
- Tallahassee
- USA
| | - Michal Malček
- Institute of Physical Chemistry and Chemical Physics
- Slovak University of Technology in Bratislava
- 81237 Bratislava
- Slovak Republic
| | - Lukas Bucinsky
- Institute of Physical Chemistry and Chemical Physics
- Slovak University of Technology in Bratislava
- 81237 Bratislava
- Slovak Republic
| | - Peter Rapta
- Institute of Physical Chemistry and Chemical Physics
- Slovak University of Technology in Bratislava
- 81237 Bratislava
- Slovak Republic
| | - Joan Cano
- Institut de Ciència Molecular
- Universitat de València
- 46980 Paterna
- Spain
| | - Joshua Telser
- Department of Biological
- Physical and Health Sciences
- Roosevelt University
- Chicago
- USA
| | - Vladimir B. Arion
- Institute of Inorganic Chemistry of the University of Vienna
- A1090 Vienna
- Austria
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52
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Flores JA, Andino JG, Lord RL, Wolfe RJ, Park H, Pink M, Telser J, Caulton KG. Probing Redox Noninnocence of Copper and Zinc Bis‐pyridylpyrrolides. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800935] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jaime A. Flores
- Department of Chemistry Indiana University 800 East Kirkwood Avenue 47405 USA Bloomington Indiana47405 USA
| | - José G. Andino
- Department of Chemistry Indiana University 800 East Kirkwood Avenue 47405 USA Bloomington Indiana47405 USA
| | - Richard L. Lord
- Department of Chemistry Grand Valley State University 49401 Allendale Michigan USA
| | - Robert J. Wolfe
- Department of Chemistry Indiana University 800 East Kirkwood Avenue 47405 USA Bloomington Indiana47405 USA
| | - Hyunsoo Park
- Department of Chemistry Indiana University 800 East Kirkwood Avenue 47405 USA Bloomington Indiana47405 USA
| | - Maren Pink
- Department of Chemistry Indiana University 800 East Kirkwood Avenue 47405 USA Bloomington Indiana47405 USA
| | - Joshua Telser
- Department of Biological Physical and Health Sciences Roosevelt University 430 South Michigan Avenue 60605 Chicago Illinois USA
| | - Kenneth G. Caulton
- Department of Chemistry Indiana University 800 East Kirkwood Avenue 47405 USA Bloomington Indiana47405 USA
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53
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Chen L, Song J, Zhao W, Yi G, Zhou Z, Yuan A, Song Y, Wang Z, Ouyang ZW. A mononuclear five-coordinate Co(ii) single molecule magnet with a spin crossover between the S = 1/2 and 3/2 states. Dalton Trans 2018; 47:16596-16602. [PMID: 30417917 DOI: 10.1039/c8dt03783c] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Although a great number of single-ion magnets (SIMs) and spin-crossover (SCO) compounds have been discovered, multifunctional materials with the combination of SCO and SIM properties are extremely scarce. Here magnetic studies have been carried out for a mononuclear, five-coordinate cobalt(ii) complex [Co(3,4-lut)4Br]Br (1) with square pyramidal geometry. Direct-current magnetic measurement confirms the spin transition between the S = 1/2 and 3/2 states in the range of 150-290 K with a small hysteresis loop. Frequency- and temperature-dependent alternating-current magnetic susceptibility reveals slow magnetization relaxation under an applied dc field of 3000 Oe. The work here presents the first instance of the five-coordinate mononuclear cobalt(ii)-based SIM exhibiting the thermally induced complete SCO.
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Affiliation(s)
- Lei Chen
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, P. R. China.
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54
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Laguta O, Tuček M, van Slageren J, Neugebauer P. Multi-frequency rapid-scan HFEPR. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2018; 296:138-142. [PMID: 30261338 DOI: 10.1016/j.jmr.2018.09.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 09/11/2018] [Accepted: 09/12/2018] [Indexed: 06/08/2023]
Abstract
Gaining access to electron spin dynamics at (sub-)THz frequencies is highly challenging. However, this information is highly relevant for the understanding and development of spin polarization agents in dynamic nuclear polarization methods and single-molecule magnets for quantum computation. Here we demonstrate the first rapid-scan EPR experiment in 200 GHz frequency region. A voltage controlled oscillator (VCO) generated fast sinusoidal frequency sweeps with scan rates up to 3×105 THz/s after the frequency multiplication, which is equal to 107 T/s in field representation. Such high scan rates provide access to extremely short relaxation times T2=2π×sweeprate-0.5≈1 ns. The absence of a microwave cavity allowed us to perform multi-frequency experiments in the 170-250 GHz range. A further advantage of a cavity-less approach is the possibility to use vast sweeps, which in turn, allows the deconvolution using a linear sweep function. The deconvoluted spectra obtained with this method are identical to the slow-rate spectrum. We find spin-spin relaxation times of several nanoseconds for pure LiPc samples in this frequency range. These values cannot be obtained by means of conventional pulsed EPR methods.
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Affiliation(s)
- O Laguta
- Institute for Physical Chemistry and Center for Integrated Quantum Science and Technology, Universität Stuttgart, Pfaffenwaldring 55, Stuttgart D-70569, Germany
| | - M Tuček
- Central European Institute of Technology, Brno University of Technology, Purkyňova 656/123, Brno 61200, Czech Republic
| | - J van Slageren
- Institute for Physical Chemistry and Center for Integrated Quantum Science and Technology, Universität Stuttgart, Pfaffenwaldring 55, Stuttgart D-70569, Germany
| | - P Neugebauer
- Central European Institute of Technology, Brno University of Technology, Purkyňova 656/123, Brno 61200, Czech Republic.
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55
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Steele JL, Tahsini L, Sun C, Elinburg JK, Kotyk CM, McNeely J, Stoian SA, Dragulescu-Andrasi A, Ozarowski A, Ozerov M, Krzystek J, Telser J, Bacon JW, Golen JA, Rheingold AL, Doerrer LH. Square-planar Co(iii) in {O 4} coordination: large ZFS and reactivity with ROS. Chem Commun (Camb) 2018; 54:12045-12048. [PMID: 30294742 DOI: 10.1039/c8cc04464c] [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
Oxidation of distorted square-planar perfluoropinacolate Co compound [CoII(pinF)2]2-, 1, to [CoIII(pinF)2]1-, 2, is reported. Rigidly square-planar 2 has an intermediate-spin, S = 1, ground state and very large zero-field splitting (ZFS) with D = 67.2 cm-1; |E| = 18.0 cm-1, (E/D = 0.27), g⊥ = 2.10, g‖ = 2.25 and χTIP = 1950 × 10-6 cm3 mol-1. This Co(iii) species, 2, reacts with ROS to oxidise two (pinF)2- ligands to form tetrahedral [CoII(Hpfa)4]2-, 3.
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Affiliation(s)
- Jennifer L Steele
- Chemistry Department, Boston University, 590 Commonwealth Ave., Boston, MA 02215, USA.
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56
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Greer SM, Oakley RT, van Tol J, Shatruk M, Hill S. Investigating the thermally- and light-induced interconversion of bisdithiazolyl radicals and dimers with high-field EPR. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.06.047] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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57
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Magnetostructural correlations in S = 1 trans-[Ni{(OPPh2)(EPPh2)N}2(dmso)2], E = S, Se, and related complexes. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.05.032] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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58
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Takahashi H, Okamoto T, Ishimura K, Hara S, Ohmichi E, Ohta H. Force-detected high-frequency electron spin resonance spectroscopy using magnet-mounted nanomembrane: Robust detection of thermal magnetization modulation. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:083905. [PMID: 30184643 DOI: 10.1063/1.5034529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Accepted: 07/29/2018] [Indexed: 06/08/2023]
Abstract
In this study, we report a conceptually novel broadband high-frequency electron spin resonance (HFESR) spectroscopic technique. In contrast to the ordinary force-detected electron spin resonance (ESR) technique, which detects the magnetization change due to the saturation effect, this method measures the magnetization change due to the change of the sample temperature at resonance. To demonstrate its principle, we developed a silicon nitride nanomembrane-based force-detected ESR spectrometer, which can be stably operated even at high magnetic fields. Test measurements were performed for samples with different spin relaxation times. We succeeded in obtaining a seamless ESR spectrum in magnetic fields of 15 T and frequencies of 636 GHz without significant spectral distortion. A high spin sensitivity of 1012 spins/G s was obtained, which was independent of the spin relaxation time. These results show that this technique can be used as a practical method in research fields where the HFESR technique is applicable.
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Affiliation(s)
- Hideyuki Takahashi
- Organization for Advanced and Integrated Research, Kobe University, 1-1, Rokkodai, Nada, Kobe 657-8501, Japan
| | - Tsubasa Okamoto
- Graduate School of Science, Kobe University, 1-1 Rokkodai-cho, Nada, Kobe 657-8501, Japan
| | - Kento Ishimura
- Graduate School of Science, Kobe University, 1-1 Rokkodai-cho, Nada, Kobe 657-8501, Japan
| | - Shigeo Hara
- Research Facility Center for Science and Technology, Kobe University, 1-1 Rokkodai-cho, Nada, Kobe 657-8501, Japan
| | - Eiji Ohmichi
- Graduate School of Science, Kobe University, 1-1 Rokkodai-cho, Nada, Kobe 657-8501, Japan
| | - Hitoshi Ohta
- Molecular Photoscience Research Center, Kobe University, 1-1 Rokkodai-cho, Nada, Kobe 657-8501, Japan
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59
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Yousif M, Wannipurage D, Huizenga CD, Washnock-Schmid E, Peraino NJ, Ozarowski A, Stoian SA, Lord RL, Groysman S. Catalytic Nitrene Homocoupling by an Iron(II) Bis(alkoxide) Complex: Bulking Up the Alkoxide Enables a Wider Range of Substrates and Provides Insight into the Reaction Mechanism. Inorg Chem 2018; 57:9425-9438. [PMID: 30015481 DOI: 10.1021/acs.inorgchem.8b01418] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The reaction of HOR' (OR' = di-t-butyl-(3,5-diphenylphenyl)methoxide) with an iron(II) amide precursor forms the iron(II) bis(alkoxide) complex Fe(OR')2(THF)2 (2). 2 (5-10 mol %) serves as a catalyst for the conversion of aryl azides into the corresponding azoarenes. The highest yields are observed for aryl azides featuring two ortho substituents; other substitution patterns in the aryl azide precursor lead to moderate or low yields. The reaction of 2 with stoichiometric amounts (2 equiv) of the corresponding aryl azide shows the formation of azoarenes as the only organic products for the bulkier aryl azides (Ar = mesityl, 2,6-diethylphenyl). In contrast, formation of tetrazene complexes Fe(OR')2(ArNNNNAr) (3-6) is observed for the less bulky aryl azides (Ar = phenyl, 4-methylphenyl, 4-methoxyphenyl, 3,5-dimethylphenyl). The electronic structure of selected tetrazene complexes was probed by spectroscopy (field-dependent 57Fe Mössbauer and high-frequency EPR) and density functional theory calculations. These studies revealed that Fe(OR')2(ArNNNNAr) complexes contain high-spin ( S = 5/2) iron(III) centers exchange-coupled to tetrazene radical anions. Tetrazene complexes Fe(OR')2(ArNNNNAr) produce the corresponding azoarenes (ArNNAr) upon heating. Treatment of a tetrazene complex Fe(OR')2(ArNNNNAr) with a different azide (N3Ar') produces all three possible products ArNNAr, ArNNAr', and Ar'NNAr'. These experiments and quantum mechanics/molecular mechanics calculations exploring the reaction mechanism suggest that the tetrazene functionality serves as a masked form of the reactive iron mono(imido) species.
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Affiliation(s)
- Maryam Yousif
- Department of Chemistry , Wayne State University , 5101 Cass Avenue , Detroit , Michigan 48202 , United States
| | - Duleeka Wannipurage
- Department of Chemistry , Wayne State University , 5101 Cass Avenue , Detroit , Michigan 48202 , United States
| | - Caleb D Huizenga
- Department of Chemistry , Grand Valley State University , Allendale , Michigan 49401 , United States
| | - Elizabeth Washnock-Schmid
- Department of Chemistry , Grand Valley State University , Allendale , Michigan 49401 , United States
| | - Nicholas J Peraino
- Department of Chemistry , Wayne State University , 5101 Cass Avenue , Detroit , Michigan 48202 , United States
| | - Andrew Ozarowski
- National High Magnetic Field Laboratory , Florida State University , Tallahassee , Florida 32310 , United States
| | - Sebastian A Stoian
- Department of Chemistry , University of Idaho , Moscow , Idaho 83844 , United States
| | - Richard L Lord
- Department of Chemistry , Grand Valley State University , Allendale , Michigan 49401 , United States
| | - Stanislav Groysman
- Department of Chemistry , Wayne State University , 5101 Cass Avenue , Detroit , Michigan 48202 , United States
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60
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Joshi G, Teferi MY, Miller R, Jamali S, Baird D, van Tol J, Malissa H, Lupton JM, Boehme C. Isotropic Effective Spin-Orbit Coupling in a Conjugated Polymer. J Am Chem Soc 2018; 140:6758-6762. [DOI: 10.1021/jacs.8b03069] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Gajadhar Joshi
- Department of Physics and Astronomy, University of Utah, 115 S, 1400 E, Salt Lake City, Utah 84112, United States
| | - Mandefro Y. Teferi
- Department of Physics and Astronomy, University of Utah, 115 S, 1400 E, Salt Lake City, Utah 84112, United States
| | - Richards Miller
- Department of Physics and Astronomy, University of Utah, 115 S, 1400 E, Salt Lake City, Utah 84112, United States
| | - Shirin Jamali
- Department of Physics and Astronomy, University of Utah, 115 S, 1400 E, Salt Lake City, Utah 84112, United States
| | - Douglas Baird
- Department of Physics and Astronomy, University of Utah, 115 S, 1400 E, Salt Lake City, Utah 84112, United States
| | - Johan van Tol
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Hans Malissa
- Department of Physics and Astronomy, University of Utah, 115 S, 1400 E, Salt Lake City, Utah 84112, United States
| | - John M. Lupton
- Department of Physics and Astronomy, University of Utah, 115 S, 1400 E, Salt Lake City, Utah 84112, United States
- Institut für Experimentelle und Angewandte Physik, Universität Regensburg, Universitätsstrasse 31, 93040 Regensburg, Germany
| | - Christoph Boehme
- Department of Physics and Astronomy, University of Utah, 115 S, 1400 E, Salt Lake City, Utah 84112, United States
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61
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Greer SM, McKay J, Gramigna KM, Thomas CM, Stoian SA, Hill S. Probing Fe-V Bonding in a C 3-Symmetric Heterobimetallic Complex. Inorg Chem 2018; 57:5870-5878. [PMID: 29708752 DOI: 10.1021/acs.inorgchem.8b00280] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Direct metal-metal bonding of two distinct first-row transition metals remains relatively unexplored compared to their second- and third-row heterobimetallic counterparts. Herein, a recently reported Fe-V triply bonded species, [V( iPrNPPh2)3FeI] (1; Kuppuswamy, S.; Powers, T. M.; Krogman, J. P.; Bezpalko, M. W.; Foxman, B. M.; Thomas, C. M. Vanadium-iron complexes featuring metal-metal multiple bonds. Chem. Sci. 2013, 4, 3557-3565), is investigated using high-frequency electron paramagnetic resonance, field- and temperature-dependent 57Fe nuclear gamma resonance (Mössbauer) spectroscopy, and high-field electron-electron double resonance detected nuclear magnetic resonance. From the use of this suite of physical methods, we have assessed the electronic structure of 1. These studies allow us to establish the effective g̃ tensors as well as the Fe/V electro-nuclear hyperfine interaction tensors of the spin S = 1/2 ground state. We have rationalized these tensors in the context of ligand field theory supported by quantum chemical calculations. This theoretical analysis suggests that the S = 1/2 ground state originates from a single unpaired electron predominately localized on the Fe site.
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Affiliation(s)
- Samuel M Greer
- National High Magnetic Field Laboratory , Florida State University , Tallahassee , Florida 32310 , United States.,Department of Chemistry and Biochemistry , Florida State University , Tallahassee , Florida 32306 , United States
| | - Johannes McKay
- National High Magnetic Field Laboratory , Florida State University , Tallahassee , Florida 32310 , United States
| | - Kathryn M Gramigna
- Department of Chemistry , Brandeis University , Waltham , Massachusetts 02453 , United States
| | - Christine M Thomas
- Department of Chemistry , Brandeis University , Waltham , Massachusetts 02453 , United States.,Department of Chemistry and Biochemistry , The Ohio State University , Columbus , Ohio 43210 , United States
| | - Sebastian A Stoian
- National High Magnetic Field Laboratory , Florida State University , Tallahassee , Florida 32310 , United States.,Department of Chemistry , University of Idaho , Moscow , Idaho 83844 , United States
| | - Stephen Hill
- National High Magnetic Field Laboratory , Florida State University , Tallahassee , Florida 32310 , United States.,Department of Physics , Florida State University , Tallahassee , Florida 32306 , United States
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62
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Davis I, Koto T, Terrell JR, Kozhanov A, Krzystek J, Liu A. High-Frequency/High-Field Electron Paramagnetic Resonance and Theoretical Studies of Tryptophan-Based Radicals. J Phys Chem A 2018; 122:3170-3176. [PMID: 29488750 DOI: 10.1021/acs.jpca.7b12434] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Tryptophan-based free radicals have been implicated in a myriad of catalytic and electron transfer reactions in biology. However, very few of them have been trapped so that biophysical characterizations can be performed in a high-precision context. In this work, tryptophan derivative-based radicals were studied by high-frequency/high-field electron paramagnetic resonance (HFEPR) and quantum chemical calculations. Radicals were generated at liquid nitrogen temperature with a photocatalyst, sacrificial oxidant, and violet laser. The precise g-anisotropies of l- and d-tryptophan, 5-hydroxytryptophan, 5-methoxytryptophan, 5-fluorotryptophan, and 7-hydroxytryptophan were measured directly by HFEPR. Quantum chemical calculations were conducted to predict both neutral and cationic radical spectra for comparison with the experimental data. The results indicate that under the experimental conditions, all radicals formed were cationic. Spin densities of the radicals were also calculated. The various line patterns and g-anisotropies observed by HFEPR can be understood in terms of spin-density populations and the positioning of oxygen atom substitution on the tryptophan ring. The results are considered in the light of the tryptophan and 7-hydroxytryptophan diradical found in the biosynthesis of the tryptophan tryptophylquinone cofactor of methylamine dehydrogenase.
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Affiliation(s)
- Ian Davis
- Department of Chemistry , University of Texas , San Antonio , Texas 78249 , United States.,Department of Chemistry , Georgia State University , Atlanta , Georgia 30303 , United States
| | - Teruaki Koto
- Department of Chemistry , University of Texas , San Antonio , Texas 78249 , United States
| | - James R Terrell
- Department of Chemistry , Georgia State University , Atlanta , Georgia 30303 , United States
| | - Alexander Kozhanov
- Department of Physics and Astronomy , Georgia State University , Atlanta , Georgia 30303 , United States
| | - J Krzystek
- National High Magnetic Field Laboratory , Florida State University , Tallahassee , Florida 32310 , United States
| | - Aimin Liu
- Department of Chemistry , University of Texas , San Antonio , Texas 78249 , United States
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63
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Veber SL, Tumanov SV, Fursova EY, Shevchenko OA, Getmanov YV, Scheglov MA, Kubarev VV, Shevchenko DA, Gorbachev II, Salikova TV, Kulipanov GN, Ovcharenko VI, Fedin MV. X-band EPR setup with THz light excitation of Novosibirsk Free Electron Laser: Goals, means, useful extras. JOURNAL OF MAGNETIC RESONANCE (SAN DIEGO, CALIF. : 1997) 2018; 288:11-22. [PMID: 29360045 DOI: 10.1016/j.jmr.2018.01.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2017] [Revised: 01/10/2018] [Accepted: 01/11/2018] [Indexed: 06/07/2023]
Abstract
Electron Paramagnetic Resonance (EPR) station at the Novosibirsk Free Electron Laser (NovoFEL) user facility is described. It is based on X-band (∼9 GHz) EPR spectrometer and operates in both Continuous Wave (CW) and Time-Resolved (TR) modes, each allowing detection of either direct or indirect influence of high-power NovoFEL light (THz and mid-IR) on the spin system under study. The optics components including two parabolic mirrors, shutters, optical chopper and multimodal waveguide allow the light of NovoFEL to be directly fed into the EPR resonator. Characteristics of the NovoFEL radiation, the transmission and polarization-retaining properties of the waveguide used in EPR experiments are presented. The types of proposed experiments accessible using this setup are sketched. In most practical cases the high-power radiation applied to the sample induces its rapid temperature increase (T-jump), which is best visible in TR mode. Although such influence is a by-product of THz radiation, this thermal effect is controllable and can deliberately be used to induce and measure transient signals of arbitrary samples. The advantage of tunable THz radiation is the absence of photo-induced processes in the sample and its high penetration ability, allowing fast heating of a large portion of virtually any sample and inducing intense transients. Such T-jump TR EPR spectroscopy with THz pulses has been previewed for the two test samples, being a useful supplement for the main goals of the created setup.
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Affiliation(s)
- Sergey L Veber
- International Tomography Center, SB RAS, Novosibirsk 630090, Russia; Novosibirsk State University, Novosibirsk 630090, Russia.
| | - Sergey V Tumanov
- International Tomography Center, SB RAS, Novosibirsk 630090, Russia; Novosibirsk State University, Novosibirsk 630090, Russia
| | - Elena Yu Fursova
- International Tomography Center, SB RAS, Novosibirsk 630090, Russia
| | - Oleg A Shevchenko
- Budker Institute of Nuclear Physics, SB RAS, Novosibirsk 630090, Russia
| | | | | | - Vitaly V Kubarev
- Novosibirsk State University, Novosibirsk 630090, Russia; Budker Institute of Nuclear Physics, SB RAS, Novosibirsk 630090, Russia
| | | | | | | | | | | | - Matvey V Fedin
- International Tomography Center, SB RAS, Novosibirsk 630090, Russia; Novosibirsk State University, Novosibirsk 630090, Russia
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64
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Sertphon D, Harding P, Murray KS, Moubaraki B, Chilton NF, Hill S, Marbey J, Adams H, Davies CG, Jameson GNL, Harding DJ. Self-assembly of a mixed-valence FeII–FeIII tetranuclear star. Dalton Trans 2018; 47:7118-7122. [DOI: 10.1039/c8dt01241e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A self-assembled mixed-valence FeII–FeIII tetranuclear star is reported that shows ferromagnetic coupling, field-induced single molecule magnetism and strong magnetic anisotropy at the peripheral FeII centres.
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Affiliation(s)
- Darunee Sertphon
- Functional Materials and Nanotechnology Centre of Excellence
- Walailak University
- Thasala
- Thailand
| | - Phimphaka Harding
- Functional Materials and Nanotechnology Centre of Excellence
- Walailak University
- Thasala
- Thailand
| | | | | | - Nicholas F. Chilton
- School of Chemistry and Photon Science Institute
- The University of Manchester
- Manchester M13 9PL
- UK
| | - Stephen Hill
- Florida State University
- Department of Physics
- Tallahassee
- USA
- National High Magnetic Field Laboratory
| | - Jonathan Marbey
- Florida State University
- Department of Physics
- Tallahassee
- USA
- National High Magnetic Field Laboratory
| | - Harry Adams
- Department of Chemistry
- University of Sheffield
- Sheffield
- UK
| | - Casey G. Davies
- Department of Chemistry & MacDiarmid Institute for Advanced Materials and Nanotechnology
- University of Otago
- Dunedin
- New Zealand
| | - Guy N. L. Jameson
- Department of Chemistry & MacDiarmid Institute for Advanced Materials and Nanotechnology
- University of Otago
- Dunedin
- New Zealand
- School of Chemistry
| | - David J. Harding
- Functional Materials and Nanotechnology Centre of Excellence
- Walailak University
- Thasala
- Thailand
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65
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Neugebauer P, Bloos D, Marx R, Lutz P, Kern M, Aguilà D, Vaverka J, Laguta O, Dietrich C, Clérac R, van Slageren J. Ultra-broadband EPR spectroscopy in field and frequency domains. Phys Chem Chem Phys 2018; 20:15528-15534. [DOI: 10.1039/c7cp07443c] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Electron paramagnetic resonance (EPR) is a powerful technique to investigate the electronic and magnetic properties of a wide range of materials.
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66
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Androš Dubraja L, Jurić M, Lafargue-Dit-Hauret W, Pajić D, Zorko A, Ozarowski A, Rocquefelte X. First crystal structures of oxo-bridged [Cr IIITa V] dinuclear complexes: spectroscopic, magnetic and theoretical investigations of the Cr–O–Ta core. NEW J CHEM 2018. [DOI: 10.1039/c8nj01493k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The vibrational, electronic, structural and magnetic properties of dinuclear compounds with a Cr–O–Ta bridge were validated with DFT calculations.
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Affiliation(s)
| | | | | | - Damir Pajić
- Department of Physics
- Faculty of Science
- University of Zagreb
- 10000 Zagreb
- Croatia
| | | | - Andrew Ozarowski
- National High Magnetic Field Laboratory
- Florida State University
- Tallahassee
- USA
| | - Xavier Rocquefelte
- Institut des Sciences Chimiques de Rennes
- UMR CNRS 6226
- Université de Rennes 1
- 35042 Rennes
- France
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67
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Chen SY, Cui HH, Zhang YQ, Wang Z, Ouyang ZW, Chen L, Chen XT, Yan H, Xue ZL. Magnetic anisotropy and relaxation behavior of six-coordinate tris(pivalato)-Co(ii) and -Ni(ii) complexes. Dalton Trans 2018; 47:10162-10171. [DOI: 10.1039/c8dt01554f] [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
Magnetic measurements, HFEPR and theoretical calculations have been used to study the magnetic anisotropy of the six-coordinate field-induced single ion magnet (NBu4)[Co(piv)3] and its Ni analogue.
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Affiliation(s)
- Shu-Yang Chen
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
- China
| | - Hui-Hui Cui
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
- China
| | - Yi-Quan Zhang
- Jiangsu Key Laboratory for NSLSCS
- School of Physical Science and Technology
- Nanjing Normal University
- Nanjing 210023
- China
| | - Zhenxing Wang
- Wuhan National High Magnetic Field Center & School of Physics
- Huazhong University of Science and Technology
- Wuhan 430074
- China
| | - Zhong-Wen Ouyang
- Wuhan National High Magnetic Field Center & School of Physics
- Huazhong University of Science and Technology
- Wuhan 430074
- China
| | - Lei Chen
- School of Environmental and Chemical Engineering
- Jiangsu University of Science and Technology
- Zhenjiang 212003
- China
| | - Xue-Tai Chen
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
- China
| | - Hong Yan
- State Key Laboratory of Coordination Chemistry
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
- China
| | - Zi-Ling Xue
- Department of Chemistry
- University of Tennessee
- Knoxville
- USA
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68
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Escobar LBL, Guedes GP, Soriano S, Cassaro RAA, Marbey J, Hill S, Novak MA, Andruh M, Vaz MGF. Synthesis, Crystal Structures, and EPR Studies of First MnIIILnIII Hetero-binuclear Complexes. Inorg Chem 2017; 57:326-334. [DOI: 10.1021/acs.inorgchem.7b02575] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lívia B. L. Escobar
- Instituto de Química, Universidade Federal Fluminense, Niterói, Rio de Janeiro, 24020-150, Brazil
- Department of Physics and NHMFL, Florida State University, Tallahassee, Florida 32310, United States
| | - Guilherme P. Guedes
- Departamento
de Química, Instituto de Ciências Exatas, Universidade Federal Rural do Rio de Janeiro, Seropédica, Rio de Janeiro, 23897-970, Brazil
| | - Stéphane Soriano
- Instituto de Física, Universidade Federal Fluminense, Niterói, Rio de Janeiro, 24020-140, Brazil
| | - Rafael A. A. Cassaro
- Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-909, Brazil
| | - Jonathan Marbey
- Department of Physics and NHMFL, Florida State University, Tallahassee, Florida 32310, United States
| | - Stephen Hill
- Department of Physics and NHMFL, Florida State University, Tallahassee, Florida 32310, United States
| | - Miguel A. Novak
- Instituto de Física, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-972, Brazil
| | - Marius Andruh
- Inorganic Chemistry Laboratory, Faculty
of Chemistry, University of Bucharest, Str. Dumbrava Rosie, no. 23, 020464, Bucharest, Romania
| | - Maria G. F. Vaz
- Instituto de Química, Universidade Federal Fluminense, Niterói, Rio de Janeiro, 24020-150, Brazil
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69
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Xu S, Bucinsky L, Breza M, Krzystek J, Chen CH, Pink M, Telser J, Smith JM. Ligand Substituent Effects in Manganese Pyridinophane Complexes: Implications for Oxygen-Evolving Catalysis. Inorg Chem 2017; 56:14315-14325. [DOI: 10.1021/acs.inorgchem.7b02421] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Song Xu
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405-7102, United States
| | - Lukas Bucinsky
- Institute of Physical Chemistry and Chemical
Physics, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, SK-81237 Bratislava, Slovakia
| | - Martin Breza
- Institute of Physical Chemistry and Chemical
Physics, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, SK-81237 Bratislava, Slovakia
| | - J. Krzystek
- National
High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Chun-Hsing Chen
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405-7102, United States
| | - Maren Pink
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405-7102, United States
| | - Joshua Telser
- Department of Biological, Chemical and
Physical Sciences, Roosevelt University, Chicago, Illinois 60605, United States
| | - Jeremy M. Smith
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405-7102, United States
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70
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Across the tree of life, radiation resistance is governed by antioxidant Mn 2+, gauged by paramagnetic resonance. Proc Natl Acad Sci U S A 2017; 114:E9253-E9260. [PMID: 29042516 PMCID: PMC5676931 DOI: 10.1073/pnas.1713608114] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Despite concerted functional genomic efforts to understand the complex phenotype of ionizing radiation (IR) resistance, a genome sequence cannot predict whether a cell is IR-resistant or not. Instead, we report that absorption-display electron paramagnetic resonance (EPR) spectroscopy of nonirradiated cells is highly diagnostic of IR survival and repair efficiency of DNA double-strand breaks (DSBs) caused by exposure to gamma radiation across archaea, bacteria, and eukaryotes, including fungi and human cells. IR-resistant cells, which are efficient at DSB repair, contain a high cellular content of manganous ions (Mn2+) in high-symmetry (H) antioxidant complexes with small metabolites (e.g., orthophosphate, peptides), which exhibit narrow EPR signals (small zero-field splitting). In contrast, Mn2+ ions in IR-sensitive cells, which are inefficient at DSB repair, exist largely as low-symmetry (L) complexes with substantially broadened spectra seen with enzymes and strongly chelating ligands. The fraction of cellular Mn2+ present as H-complexes (H-Mn2+), as measured by EPR of live, nonirradiated Mn-replete cells, is now the strongest known gauge of biological IR resistance between and within organisms representing all three domains of life: Antioxidant H-Mn2+ complexes, not antioxidant enzymes (e.g., Mn superoxide dismutase), govern IR survival. As the pool of intracellular metabolites needed to form H-Mn2+ complexes depends on the nutritional status of the cell, we conclude that IR resistance is predominantly a metabolic phenomenon. In a cross-kingdom analysis, the vast differences in taxonomic classification, genome size, and radioresistance between cell types studied here support that IR resistance is not controlled by the repertoire of DNA repair and antioxidant enzymes.
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71
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Grubba R, Kaniewska K, Ponikiewski Ł, Cristóvão B, Ferenc W, Dragulescu-Andrasi A, Krzystek J, Stoian SA, Pikies J. Synthetic, Structural, and Spectroscopic Characterization of a Novel Family of High-Spin Iron(II) [(β-Diketiminate)(phosphanylphosphido)] Complexes. Inorg Chem 2017; 56:11030-11042. [PMID: 28841309 DOI: 10.1021/acs.inorgchem.7b01374] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
This work describes a series of iron(II) phosphanylphosphido complexes. These compounds were obtained by reacting lithiated diphosphanes R2PP(SiMe3)Li (R = t-Bu, i-Pr) with an iron(II) β-diketiminate complex, [LFe(μ2-Cl)2Li(DME)2] (1), where DME = 1,2-dimethoxyethane and L = Dippnacnac (β-diketiminate). While the reaction of 1 with t-Bu2PP(SiMe3)Li yields [LFe(η1-Me3SiPP-t-Bu2)] (2), that of 1 with equimolar amounts of i-Pr2PP(SiMe3)Li, in DME, leads to [LFe(η2-i-Pr2PPSiMe3)] (3). In contrast, the reaction of 1 with (i-Pr2N)2PP(SiMe3)Li provides not an iron-containing complex but 1-[(diisopropylamino)phosphine]-2,4-bis(diisopropylamino)-3-(trimethylsilyl)tetraphosphetane (4). The structures of 2-4 were determined using diffractometry. Thus, 2 exhibits a three-coordinate iron site and 3 a four-coordinate iron site. The increase in the coordination number is induced by the change from an anticlinal to a synclinal conformation of the phoshpanylphosphido ligands. The electronic structures of 2 and 3 were assessed through a combined field-dependent 57Fe Mössbauer and high-frequency and -field electron paramagnetic resonance spectroscopic investigation in conjunction with analysis of their magnetic susceptibility and magnetization data. These studies revealed two high-spin iron(II) sites with S = 2 ground states that have different properties. While 2 exhibits a zero-field splitting described by a positive D parameter (D = +17.4 cm-1; E/D = 0.11) for 3, this parameter is negative [D = -25(5) cm-1; E/D = 0.15(5)]. Density functional theory (DFT) and time-dependent DFT (TDDFT) calculations provide insights into the origin of these differences and allow us to rationalize the fine and hyperfine structure parameters of 2 and 3. Thus, for 2, the spin-orbit coupling mixes a z2-type ground state with two low-lying {xz/yz} orbital states. These interactions lead to an easy plane of magnetization, which is essentially parallel to the plane defined by the N-Fe-N atoms. For 3, we find a yz-type ground state that is strongly mixed with a low-lying z2-type orbital state. In this case, the spin-orbit interaction leads to a partial unquenching of the orbital momentum along the x axis, that is, to an easy axis of magnetization oriented roughly along the Fe-P bond of the phosphido moiety.
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Affiliation(s)
- Rafał Grubba
- Department of Inorganic Chemistry, Chemical Faculty, Gdańsk University of Technology , G. Narutowicza St. 11/12, Gdańsk PL-80-233, Poland
| | - Kinga Kaniewska
- Department of Inorganic Chemistry, Chemical Faculty, Gdańsk University of Technology , G. Narutowicza St. 11/12, Gdańsk PL-80-233, Poland
| | - Łukasz Ponikiewski
- Department of Inorganic Chemistry, Chemical Faculty, Gdańsk University of Technology , G. Narutowicza St. 11/12, Gdańsk PL-80-233, Poland
| | - Beata Cristóvão
- Department of General and Coordination Chemistry, Faculty of Chemistry, Maria Curie-Skłodowska University , Maria Curie-Skłodowska Sq. 2, Lublin PL-20-031, Poland
| | - Wiesława Ferenc
- Department of General and Coordination Chemistry, Faculty of Chemistry, Maria Curie-Skłodowska University , Maria Curie-Skłodowska Sq. 2, Lublin PL-20-031, Poland
| | - Alina Dragulescu-Andrasi
- Department of Chemistry and Biochemistry, Florida State University , Tallahassee, Florida 32306, United States
| | - J Krzystek
- National High Magnetic Field Laboratory, Florida State University , Tallahassee, Florida 32310, United States
| | - Sebastian A Stoian
- Department of Chemistry and Biochemistry, Florida State University , Tallahassee, Florida 32306, United States.,National High Magnetic Field Laboratory, Florida State University , Tallahassee, Florida 32310, United States.,Department of Chemistry, University of Idaho , Moscow, Idaho 83844, United States
| | - Jerzy Pikies
- Department of Inorganic Chemistry, Chemical Faculty, Gdańsk University of Technology , G. Narutowicza St. 11/12, Gdańsk PL-80-233, Poland
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72
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Palacios MA, Nehrkorn J, Suturina EA, Ruiz E, Gómez‐Coca S, Holldack K, Schnegg A, Krzystek J, Moreno JM, Colacio E. Analysis of Magnetic Anisotropy and the Role of Magnetic Dilution in Triggering Single‐Molecule Magnet (SMM) Behavior in a Family of Co
II
Y
III
Dinuclear Complexes with Easy‐Plane Anisotropy. Chemistry 2017; 23:11649-11661. [DOI: 10.1002/chem.201702099] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Indexed: 11/10/2022]
Affiliation(s)
- María A. Palacios
- Departamento de Química Inorgánica Facultad de Ciencias Universidad de Granada 18071 Granada Spain
| | - Joscha Nehrkorn
- Department of Chemistry University of Washington Box 351700 Seattle WA 98195 USA
- Berlin Joint EPR Lab Institute for Nanospectroscopy Helmholtz-Zentrum Berlin für Materialien und Energie Kekuléstrassee 5 12489 Berlin Germany
| | | | - Eliseo Ruiz
- Departament de Química Inorgànica and Institut de Recerca de Química Teòrica i Computacional Universitat de Barcelona Diagonal 645 08028 Barcelona Spain
| | - Silvia Gómez‐Coca
- Departament de Química Inorgànica and Institut de Recerca de Química Teòrica i Computacional Universitat de Barcelona Diagonal 645 08028 Barcelona Spain
| | - Karsten Holldack
- Berlin Joint EPR Lab Institute for Nanospectroscopy Helmholtz-Zentrum Berlin für Materialien und Energie Kekuléstrassee 5 12489 Berlin Germany
| | - Alexander Schnegg
- Berlin Joint EPR Lab Institute for Nanospectroscopy Helmholtz-Zentrum Berlin für Materialien und Energie Kekuléstrassee 5 12489 Berlin Germany
| | - Jurek Krzystek
- National High Magnetic Field Laboratory Florida State University Tallahassee FL 32310 USA
| | - José M. Moreno
- Departamento de Química Inorgánica Facultad de Ciencias Universidad de Granada 18071 Granada Spain
| | - Enrique Colacio
- Departamento de Química Inorgánica Facultad de Ciencias Universidad de Granada 18071 Granada Spain
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73
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Buvaylo EA, Kokozay VN, Vassilyeva OY, Skelton BW, Ozarowski A, Titiš J, Vranovičová B, Boča R. Field-Assisted Slow Magnetic Relaxation in a Six-Coordinate Co(II)-Co(III) Complex with Large Negative Anisotropy. Inorg Chem 2017; 56:6999-7009. [PMID: 28556666 DOI: 10.1021/acs.inorgchem.7b00605] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The reaction of Co(CH3COO)2·4H2O with the Schiff base ligand LH4 derived from o-vanillin and tris(hydroxymethyl)aminomethane produces the dinuclear mixed-valence complex [CoIICoIII(LH2)2(CH3COO)(H2O)](H2O)3 (1), which has been investigated using IR spectroscopy, X-ray crystallography, temperature-dependent magnetic susceptibility, magnetization, HFEPR spectroscopy, and ac susceptibility measurements at various frequencies, temperatures, and external magnetic fields. The structure of 1 consists of neutral molecules in which two cobalt ions with distorted octahedral geometries, CoIIO6 and CoIIIN2O4, are bridged by two deprotonated -CH2O- groups of the two LH22- ligands. 1 completes a series with Cl, Br, NO3, and NCS anions published before by different authors. Low-temperature HFEPR measurements reveal that the ground electronic state of the Co(II) center in 1 is a highly anisotropic Kramers doublet; the effective g values of 7.18, 2.97, and 1.96 are frequency-independent over the frequency ranges 200-630, 200-406, and 200-300 GHz for the highest, intermediate, and lowest geff values, respectively. The two lower values were not seen at higher frequencies because the magnetic field was not high enough. Temperature-dependent magnetic susceptibility and field-dependent magnetization data confirm high magnetic anisotropy of the easy axis type. Complex 1 behaves as a single-ion magnet under a small applied external field and demonstrates two relaxation modes that strongly depend on the applied static dc field. The observation of multiple relaxation pathways clearly distinguishes 1 from the Cl and Br analogues.
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Affiliation(s)
- Elena A Buvaylo
- Department of Chemistry, Taras Shevchenko National University of Kyiv , 64/13 Volodymyrska str., Kyiv 01601, Ukraine
| | - Vladimir N Kokozay
- Department of Chemistry, Taras Shevchenko National University of Kyiv , 64/13 Volodymyrska str., Kyiv 01601, Ukraine
| | - Olga Yu Vassilyeva
- Department of Chemistry, Taras Shevchenko National University of Kyiv , 64/13 Volodymyrska str., Kyiv 01601, Ukraine
| | - Brian W Skelton
- School of Molecular Sciences, M310, University of Western Australia , Perth, WA 6009, Australia
| | - Andrew Ozarowski
- National High Magnetic Field Laboratory, Florida State University , 1800 E. Paul Dirac Drive, Tallahassee, FL 32310, United States
| | - Ján Titiš
- Department of Chemistry, Faculty of Natural Sciences, University of SS Cyril and Methodius , 917 01 Trnava, Slovakia
| | - Beáta Vranovičová
- Department of Chemistry, Faculty of Natural Sciences, University of SS Cyril and Methodius , 917 01 Trnava, Slovakia
| | - Roman Boča
- Department of Chemistry, Faculty of Natural Sciences, University of SS Cyril and Methodius , 917 01 Trnava, Slovakia
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74
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Schweinfurth D, Krzystek J, Atanasov M, Klein J, Hohloch S, Telser J, Demeshko S, Meyer F, Neese F, Sarkar B. Tuning Magnetic Anisotropy Through Ligand Substitution in Five-Coordinate Co(II) Complexes. Inorg Chem 2017; 56:5253-5265. [DOI: 10.1021/acs.inorgchem.7b00371] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- David Schweinfurth
- Institut für
Chemie und Biochemie, Freie Universität Berlin, Fabeckstraße
34-36, D-14195 Berlin, Germany
| | - J. Krzystek
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Mihail Atanasov
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, D-45470 Mülheim an der Ruhr, Germany
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
| | - Johannes Klein
- Institut für
Chemie und Biochemie, Freie Universität Berlin, Fabeckstraße
34-36, D-14195 Berlin, Germany
| | - Stephan Hohloch
- Institut für
Chemie und Biochemie, Freie Universität Berlin, Fabeckstraße
34-36, D-14195 Berlin, Germany
| | - Joshua Telser
- Department of Biological, Chemical, and Physical Sciences, Roosevelt University, Chicago, Illinois 60605, United States
| | - Serhiy Demeshko
- Universität Göttingen, Institut
für Anorganische Chemie, Tammanstraße 4, D-37077 Göttingen, Germany
| | - Franc Meyer
- Universität Göttingen, Institut
für Anorganische Chemie, Tammanstraße 4, D-37077 Göttingen, Germany
| | - Frank Neese
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Biprajit Sarkar
- Institut für
Chemie und Biochemie, Freie Universität Berlin, Fabeckstraße
34-36, D-14195 Berlin, Germany
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75
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Bucinsky L, Breza M, Lee WT, Hickey AK, Dickie DA, Nieto I, DeGayner JA, Harris TD, Meyer K, Krzystek J, Ozarowski A, Nehrkorn J, Schnegg A, Holldack K, Herber RH, Telser J, Smith JM. Spectroscopic and Computational Studies of Spin States of Iron(IV) Nitrido and Imido Complexes. Inorg Chem 2017; 56:4752-4769. [PMID: 28379707 DOI: 10.1021/acs.inorgchem.7b00512] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
High-oxidation-state metal complexes with multiply bonded ligands are of great interest for both their reactivity as well as their fundamental bonding properties. This paper reports a combined spectroscopic and theoretical investigation into the effect of the apical multiply bonded ligand on the spin-state preferences of threefold symmetric iron(IV) complexes with tris(carbene) donor ligands. Specifically, singlet (S = 0) nitrido [{PhB(ImR)3}FeN], R = tBu (1), Mes (mesityl, 2) and the related triplet (S = 1) imido complexes, [{PhB(ImR)3}Fe(NR')]+, R = Mes, R' = 1-adamantyl (3), tBu (4), were investigated by electronic absorption and Mössbauer effect spectroscopies. For comparison, two other Fe(IV) nitrido complexes, [(TIMENAr)FeN]+ (TIMENAr = tris[2-(3-aryl-imidazol-2-ylidene)ethyl]amine; Ar = Xyl (xylyl), Mes), were investigated by 57Fe Mössbauer spectroscopy, including applied-field measurements. The paramagnetic imido complexes 3 and 4 were also studied by magnetic susceptibility measurements (for 3) and paramagnetic resonance spectroscopy: high-frequency and -field electron paramagnetic resonance (for 3 and 4) and frequency-domain Fourier-transform (FD-FT) terahertz electron paramagnetic resonance (for 3), which reveal their zero-field splitting parameters. Experimentally correlated theoretical studies comprising ligand-field theory and quantum chemical theory, the latter including both density functional theory and ab initio methods, reveal the key role played by the Fe 3dz2 (a1) orbital in these systems: the nature of its interaction with the nitrido or imido ligand dictates the spin-state preference of the complex. The ability to tune the spin state through the energy and nature of a single orbital has general relevance to the factors controlling spin states in complexes with applicability as single molecule devices.
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Affiliation(s)
- Lukas Bucinsky
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology , Radlinského 9, SK-81237 Bratislava, Slovakia
| | - Martin Breza
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology , Radlinského 9, SK-81237 Bratislava, Slovakia
| | - Wei-Tsung Lee
- Department of Chemistry, Indiana University , 800 E. Kirkwood Avenue, Bloomington, Indiana 47401, United States.,Department of Chemistry and Biochemistry, New Mexico State University , Las Cruces, New Mexico 88003, United States
| | - Anne K Hickey
- Department of Chemistry, Indiana University , 800 E. Kirkwood Avenue, Bloomington, Indiana 47401, United States
| | - Diane A Dickie
- Department of Chemistry and Chemical Biology, The University of New Mexico , Albuquerque, New Mexico 87131, United States
| | - Ismael Nieto
- Department of Chemistry and Biochemistry, New Mexico State University , Las Cruces, New Mexico 88003, United States
| | - Jordan A DeGayner
- Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States
| | - T David Harris
- Department of Chemistry, Northwestern University , Evanston, Illinois 60208, United States
| | - Karsten Meyer
- Department of Chemistry and Pharmacy, Friedrich-Alexander-University Erlangen-Nürnberg , Egerlandstraße 1, D-91058 Erlangen, Germany
| | - J Krzystek
- National High Magnetic Field Laboratory, Florida State University , Tallahassee, Florida 32310, United States
| | - Andrew Ozarowski
- National High Magnetic Field Laboratory, Florida State University , Tallahassee, Florida 32310, United States
| | - Joscha Nehrkorn
- Department of Chemistry, University of Washington , Seattle, Washington 98195, United States
| | | | | | - Rolfe H Herber
- Racah Institute of Physics, The Hebrew University of Jerusalem , 91904 Jerusalem, Israel
| | - Joshua Telser
- Department of Biological, Chemical and Physical Sciences, Roosevelt University , Chicago, Illinois 60605, United States
| | - Jeremy M Smith
- Department of Chemistry, Indiana University , 800 E. Kirkwood Avenue, Bloomington, Indiana 47401, United States.,Department of Chemistry and Biochemistry, New Mexico State University , Las Cruces, New Mexico 88003, United States
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76
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Reger DL, Pascui AE, Foley EA, Smith MD, Jezierska J, Wojciechowska A, Stoian SA, Ozarowski A. Dinuclear Metallacycles with Single M–X–M Bridges (X = Cl–, Br–; M = Fe(II), Co(II), Ni(II), Cu(II), Zn(II), Cd(II)): Strong Antiferromagnetic Superexchange Interactions. Inorg Chem 2017; 56:2884-2901. [PMID: 28218526 DOI: 10.1021/acs.inorgchem.6b02933] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Daniel L. Reger
- Department of Chemistry
and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Andrea E. Pascui
- Department of Chemistry
and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Elizabeth A. Foley
- Department of Chemistry
and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Mark D. Smith
- Department of Chemistry
and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Julia Jezierska
- Faculty of Chemistry, University of Wrocław, 50-383 Wrocław, Poland
| | | | - Sebastian A. Stoian
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Andrew Ozarowski
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
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77
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Clayton JA, Qi M, Godt A, Goldfarb D, Han S, Sherwin MS. Gd 3+-Gd 3+ distances exceeding 3 nm determined by very high frequency continuous wave electron paramagnetic resonance. Phys Chem Chem Phys 2017; 19:5127-5136. [PMID: 28139788 PMCID: PMC5394103 DOI: 10.1039/c6cp07119h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Electron paramagnetic resonance spectroscopy in combination with site-directed spin labeling is a very powerful tool for elucidating the structure and organization of biomolecules. Gd3+ complexes have recently emerged as a new class of spin labels for distance determination by pulsed EPR spectroscopy at Q- and W-band. We present CW EPR measurements at 240 GHz (8.6 Tesla) on a series of Gd-rulers of the type Gd-PyMTA-spacer-Gd-PyMTA, with Gd-Gd distances ranging from 1.2 nm to 4.3 nm. CW EPR measurements of these Gd-rulers show that significant dipolar broadening of the central |-1/2〉 → |1/2〉 transition occurs at 30 K for Gd-Gd distances up to ∼3.4 nm with Gd-PyMTA as the spin label. This represents a significant extension for distances accessible by CW EPR, as nitroxide-based spin labels at X-band frequencies can typically only access distances up to ∼2 nm. We show that this broadening persists at biologically relevant temperatures above 200 K, and that this method is further extendable up to room temperature by immobilizing the sample in glassy trehalose. We show that the peak-to-peak broadening of the central transition follows the expected 1/r3 dependence for the electron-electron dipolar interaction, from cryogenic temperatures up to room temperature. A simple procedure for simulating the dependence of the lineshape on interspin distance is presented, in which the broadening of the central transition is modeled as an S = 1/2 spin whose CW EPR lineshape is broadened through electron-electron dipolar interactions with a neighboring S = 7/2 spin.
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Affiliation(s)
- Jessica A Clayton
- Department of Physics, University of California, Santa Barbara, Santa Barbara, CA, USA. and Institute for Terahertz Science and Technology, University of California, Santa Barbara, Santa Barbara, CA, USA
| | - Mian Qi
- Faculty of Chemistry and Center for Molecular Materials (CM2), Bielefeld University, Bielefeld, Germany
| | - Adelheid Godt
- Faculty of Chemistry and Center for Molecular Materials (CM2), Bielefeld University, Bielefeld, Germany
| | - Daniella Goldfarb
- Department of Chemical Physics, Weizmann Institute of Science, Rehovot, Israel
| | - Songi Han
- Institute for Terahertz Science and Technology, University of California, Santa Barbara, Santa Barbara, CA, USA and Department of Chemistry and Biochemistry, University of California, Santa Barbara, Santa Barbara, CA, USA and Department of Chemical Engineering, University of California, Santa Barbara, Santa Barbara, CA, USA
| | - Mark S Sherwin
- Department of Physics, University of California, Santa Barbara, Santa Barbara, CA, USA. and Institute for Terahertz Science and Technology, University of California, Santa Barbara, Santa Barbara, CA, USA
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78
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Bruno R, Vallejo J, Marino N, De Munno G, Krzystek J, Cano J, Pardo E, Armentano D. Cytosine Nucleobase Ligand: A Suitable Choice for Modulating Magnetic Anisotropy in Tetrahedrally Coordinated Mononuclear CoII Compounds. Inorg Chem 2017; 56:1857-1864. [DOI: 10.1021/acs.inorgchem.6b02448] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Rosaria Bruno
- Dipartimento di
Chimica e Tecnologie Chimiche (CTC), Università della Calabria, 87036 Cosenza, Italy
| | - Julia Vallejo
- Departament de Química
Inorgànica/Instituto de Ciencia Molecular (ICMol), Universitat de València, 46980 Paterna, València, Spain
| | - Nadia Marino
- Dipartimento di
Chimica e Tecnologie Chimiche (CTC), Università della Calabria, 87036 Cosenza, Italy
| | - Giovanni De Munno
- Dipartimento di
Chimica e Tecnologie Chimiche (CTC), Università della Calabria, 87036 Cosenza, Italy
| | - J. Krzystek
- National
High Magnetic Field Laboratory (NHMFL), Florida State University, Tallahassee, Florida 32310, United States
| | - Joan Cano
- Departament de Química
Inorgànica/Instituto de Ciencia Molecular (ICMol), Universitat de València, 46980 Paterna, València, Spain
| | - Emilio Pardo
- Departament de Química
Inorgànica/Instituto de Ciencia Molecular (ICMol), Universitat de València, 46980 Paterna, València, Spain
| | - Donatella Armentano
- Dipartimento di
Chimica e Tecnologie Chimiche (CTC), Università della Calabria, 87036 Cosenza, Italy
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79
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Shova S, Vlad A, Cazacu M, Krzystek J, Bucinsky L, Breza M, Darvasiová D, Rapta P, Cano J, Telser J, Arion VB. A five-coordinate manganese(iii) complex of a salen type ligand with a positive axial anisotropy parameter D. Dalton Trans 2017; 46:11817-11829. [DOI: 10.1039/c7dt01809f] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Quantum chemical calculations reproduced well the electronic absorption spectrum and spin Hamiltonian parameters for MnL(NCS).
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Affiliation(s)
- Sergiu Shova
- Inorganic Polymers Department
- “Petru Poni” Institute of Macromolecular Chemistry
- Iasi 700487
- Romania
| | - Angelica Vlad
- Inorganic Polymers Department
- “Petru Poni” Institute of Macromolecular Chemistry
- Iasi 700487
- Romania
| | - Maria Cazacu
- Inorganic Polymers Department
- “Petru Poni” Institute of Macromolecular Chemistry
- Iasi 700487
- Romania
| | - J. Krzystek
- National High Magnetic Field Laboratory
- Florida State University
- Tallahassee
- USA
| | - Lukas Bucinsky
- Institute of Physical Chemistry and Chemical Physics
- Slovak University of Technology
- 81237 Bratislava
- Slovak Republic
| | - Martin Breza
- Institute of Physical Chemistry and Chemical Physics
- Slovak University of Technology
- 81237 Bratislava
- Slovak Republic
| | - Denisa Darvasiová
- Institute of Physical Chemistry and Chemical Physics
- Slovak University of Technology
- 81237 Bratislava
- Slovak Republic
| | - Peter Rapta
- Institute of Physical Chemistry and Chemical Physics
- Slovak University of Technology
- 81237 Bratislava
- Slovak Republic
| | - Joan Cano
- Institut de Ciència Molecular
- Universitat de València
- 46980 Paterna
- Spain
| | - Joshua Telser
- Department of Biological
- Chemical and Physical Sciences
- Roosevelt University
- Chicago
- USA
| | - Vladimir B. Arion
- Institute of Inorganic Chemistry of the University of Vienna
- A1090 Vienna
- Austria
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80
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Twahir UT, Ozarowski A, Angerhofer A. Redox Cycling, pH Dependence, and Ligand Effects of Mn(III) in Oxalate Decarboxylase from Bacillus subtilis. Biochemistry 2016; 55:6505-6516. [DOI: 10.1021/acs.biochem.6b00891] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Umar T. Twahir
- Department
of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Andrew Ozarowski
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United States
| | - Alexander Angerhofer
- Department
of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
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81
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Kurzydłowski D, Jaroń T, Ozarowski A, Hill S, Jagličić Z, Filinchuk Y, Mazej Z, Grochala W. Local and Cooperative Jahn–Teller Effect and Resultant Magnetic Properties of M2AgF4 (M = Na–Cs) Phases. Inorg Chem 2016; 55:11479-11489. [DOI: 10.1021/acs.inorgchem.6b02037] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Dominik Kurzydłowski
- Centre of New Technologies, University of Warsaw, Banacha 2c, 02-097, Warsaw, Poland
- Faculty
of Mathematics and Natural Sciences, Cardinal Stefan Wyszynski University in Warsaw, Wóycickiego 1/3, 01-938, Warsaw, Poland
| | - Tomasz Jaroń
- Centre of New Technologies, University of Warsaw, Banacha 2c, 02-097, Warsaw, Poland
| | - Andrew Ozarowski
- National High Magnetic Field Laboratory, Florida State University, 1800 E. Paul Dirac Drive, Tallahassee, Florida 32310, United States
| | - Stephen Hill
- National High Magnetic Field Laboratory, Florida State University, 1800 E. Paul Dirac Drive, Tallahassee, Florida 32310, United States
- Department of Physics, Florida State University, Tallahassee, Florida 32306, United States
| | - Zvonko Jagličić
- Faculty of Civil and Geodetic Engineering,
Institute of Mathematics, Physics and Mechanics, University of Ljubljana, Jadranska 19, SI-1000, Ljubljana, Slovenia
| | - Yaroslav Filinchuk
- Institute of Condensed
Matter and Nanosciences, Université Catholique de Louvain, Place L. Pasteur, B-1348, Louvain-la-Neuve, Belgium
| | - Zoran Mazej
- Department
of Inorganic Chemistry and Technology, Jožef Stefan Institute, Jamova
39, SI-1000, Ljubljana, Slovenia
| | - Wojciech Grochala
- Centre of New Technologies, University of Warsaw, Banacha 2c, 02-097, Warsaw, Poland
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82
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Sottini S, Poneti G, Ciattini S, Levesanos N, Ferentinos E, Krzystek J, Sorace L, Kyritsis P. Magnetic Anisotropy of Tetrahedral Co II Single-Ion Magnets: Solid-State Effects. Inorg Chem 2016; 55:9537-9548. [PMID: 27636564 DOI: 10.1021/acs.inorgchem.6b00508] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
This study reports the static and dynamic magnetic characterization of two mononuclear tetrahedral CoII complexes, [Co{iPr2P(E)NP(E)iPr2}2], where E = S (CoS4) and Se (CoSe4), which behave as single-ion magnets (SIMs). Low-temperature (15 K) single-crystal X-ray diffraction studies point out that the two complexes exhibit similar structural features in their first coordination sphere, but a disordered peripheral iPr group is observed only in CoS4. Although the latter complex crystallizes in an axial space group, the observed structural disorder leads to larger transverse magnetic anisotropy for the majority of the molecules compared to CoSe4, as confirmed by electron paramagnetic resonance spectroscopy. Static magnetic characterization indicates that both CoS4 and CoSe4 show easy-axis anisotropy, with comparable D values (∼-30 cm-1). Moreover, alternating-current susceptibility measurements on these CoII complexes, magnetically diluted in their isostructural ZnII analogues, highlight the role of dipolar magnetic coupling in the mechanism of magnetization reversal. In addition, our findings suggest that, despite their similar anisotropic features, CoS4 and CoSe4 relax magnetically via different processes. This work provides experimental evidence that solid-state effects may affect the magnetic behavior of SIMs.
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Affiliation(s)
- Silvia Sottini
- Department of Chemistry "Ugo Schiff" and INSTM Research Unit of Florence, University of Florence , via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| | - Giordano Poneti
- Department of Chemistry "Ugo Schiff" and INSTM Research Unit of Florence, University of Florence , via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| | - Samuele Ciattini
- Centro Interdipartimentale di Crystallografia Strutturale CRIST, University of Florence , via della Lastruccia 5, 50019 Sesto Fiorentino, Italy
| | - Nikolaos Levesanos
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens , Panepistimiopolis, GR-15771 Athens, Greece
| | - Eleftherios Ferentinos
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens , Panepistimiopolis, GR-15771 Athens, Greece
| | - J Krzystek
- National High Magnetic Field Laboratory (NHMFL), Florida State University , Tallahassee, Florida 32310, United States
| | - Lorenzo Sorace
- Department of Chemistry "Ugo Schiff" and INSTM Research Unit of Florence, University of Florence , via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| | - Panayotis Kyritsis
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens , Panepistimiopolis, GR-15771 Athens, Greece
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83
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Two coordination polymers containing the dicyanamide ligand: Synthesis, crystal structures, and HFEPR studies. Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2016.07.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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84
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Stalzer MM, Telser J, Krzystek J, Motta A, Delferro M, Marks TJ. A Neutrally Charged Trimethylmanganese(III) Complex: Synthesis, Characterization, and Disproportionation Chemistry. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00422] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Madelyn M. Stalzer
- Department
of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Joshua Telser
- Department
of Biological, Chemical, and Physical Sciences, Roosevelt University, Chicago, Illinois 60605, United States
| | - Jurek Krzystek
- National
High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Alessandro Motta
- Dipartimento
di Chimica and INSTM UdR Roma, Università degli Studi di Roma “La Sapienza” P.le A. Moro 5, Roma, I-00185, Italy
| | - Massimiliano Delferro
- Chemical Sciences & Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, United States
| | - Tobin J. Marks
- Department
of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
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85
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Zhang Y, Malik UP, Quiggins B, Nguyen H, Beedle CC, Kovalev AE, Clérac R, Hill S, Bythell BJ, Holmes SM. Structure‐Property Relationships in Tricyanoferrate(III) Building Blocks and Trinuclear Cyanide‐Bridged Complexes. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600199] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Yuanzhu Zhang
- Department of Chemistry & BiochemistryUniversity of Missouri St. Louis63121St. LouisMissouriUSA
| | - Uma P. Malik
- Department of Chemistry & BiochemistryUniversity of Missouri St. Louis63121St. LouisMissouriUSA
| | - Benjamin Quiggins
- Department of Chemistry & BiochemistryUniversity of Missouri St. Louis63121St. LouisMissouriUSA
| | - Hung Nguyen
- Department of Chemistry & BiochemistryUniversity of Missouri St. Louis63121St. LouisMissouriUSA
| | | | | | - Rodolphe Clérac
- CRPPCNRS33600PessacFrance
- CRPPUniv. Bordeaux33600PessacFrance
| | - Stephen Hill
- National High Magnetic Field Laboratory32306TallahasseeFloridaUSA
- Department of PhysicsFlorida State University32310TallahasseeFloridaUSA
| | - Benjamin J. Bythell
- Department of Chemistry & BiochemistryUniversity of Missouri St. Louis63121St. LouisMissouriUSA
| | - Stephen M. Holmes
- Department of Chemistry & BiochemistryUniversity of Missouri St. Louis63121St. LouisMissouriUSA
- Center for NanoscienceUniversity of Missouri‐St. Louis63121St. LouisMissouriUSA
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86
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Bucinsky L, Rohde GT, Que L, Ozarowski A, Krzystek J, Breza M, Telser J. HFEPR and Computational Studies on the Electronic Structure of a High-Spin Oxidoiron(IV) Complex in Solution. Inorg Chem 2016; 55:3933-45. [PMID: 27031000 DOI: 10.1021/acs.inorgchem.6b00169] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Nonheme iron enzymes perform diverse and important functions in biochemistry. The active form of these enzymes comprises the ferryl, oxidoiron(IV), [FeO](2+) unit. In enzymes, this unit is in the high-spin, quintet, S = 2, ground state, while many synthetic model compounds exist in the spin triplet, S = 1, ground state. Recently, however, Que and co-workers reported an oxidoiron(IV) complex with a quintet ground state, [FeO(TMG3tren)](OTf)2, where TMG3tren = 1,1,1-tris{2-[N2-(1,1,3,3-tetramethylguanidino)]ethyl}amine and OTf = CF3SO3(-). The trigonal geometry imposed by this ligand, as opposed to the tetragonal geometry of earlier model complexes, favors the high-spin ground state. Although [FeO(TMG3tren)](2+) has been earlier probed by magnetic circular dichroism (MCD) and Mössbauer spectroscopies, the technique of high-frequency and -field electron paramagnetic resonance (HFEPR) is superior for describing the electronic structure of the iron(IV) center because of its ability to establish directly the spin-Hamiltonian parameters of high-spin metal centers with high precision. Herein we describe HFEPR studies on [FeO(TMG3tren)](OTf)2 generated in situ and confirm the S = 2 ground state with the following parameters: D = +4.940(5) cm(-1), E = 0.000(5), B4(0) = -14(1) × 10(-4) cm(-1), g⊥ = 2.006(2), and g∥ = 2.03(2). Extraction of a fourth-order spin-Hamiltonian parameter is unusual for HFEPR and impossible by other techniques. These experimental results are combined with state-of-the-art computational studies along with previous structural and spectroscopic results to provide a complete picture of the electronic structure of this biomimetic complex. Specifically, the calculations reproduce well the spin-Hamiltonian parameters of the complex, provide a satisfying geometrical picture of the S = 2 oxidoiron(IV) moiety, and demonstrate that the TMG3tren is an "innocent" ligand.
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Affiliation(s)
- Lukas Bucinsky
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology , Radlinského 9, SK-81237 Bratislava, Slovakia
| | - Gregory T Rohde
- Department of Chemistry and Center for Metals in Biocatalysis, University of Minnesota , Minneapolis, Minnesota 55455, United States
| | - Lawrence Que
- Department of Chemistry and Center for Metals in Biocatalysis, University of Minnesota , Minneapolis, Minnesota 55455, United States
| | - Andrew Ozarowski
- National High Magnetic Field Laboratory, Florida State University , Tallahassee, Florida 32310, United States
| | - J Krzystek
- National High Magnetic Field Laboratory, Florida State University , Tallahassee, Florida 32310, United States
| | - Martin Breza
- Institute of Physical Chemistry and Chemical Physics, Faculty of Chemical and Food Technology, Slovak University of Technology , Radlinského 9, SK-81237 Bratislava, Slovakia
| | - Joshua Telser
- Department of Biological, Chemical and Physical Sciences, Roosevelt University , Chicago, Illinois 60605, United States
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87
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Zlatar M, Gruden M, Vassilyeva OY, Buvaylo EA, Ponomarev AN, Zvyagin SA, Wosnitza J, Krzystek J, Garcia-Fernandez P, Duboc C. Origin of the Zero-Field Splitting in Mononuclear Octahedral Mn(IV) Complexes: A Combined Experimental and Theoretical Investigation. Inorg Chem 2016; 55:1192-201. [PMID: 26745448 DOI: 10.1021/acs.inorgchem.5b02368] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The aim of this work was to determine and understand the origin of the electronic properties of Mn(IV) complexes, especially the zero-field splitting (ZFS), through a combined experimental and theoretical investigation on five well-characterized mononuclear octahedral Mn(IV) compounds, with various coordination spheres (N6, N3O3, N2O4 in both trans (trans-N2O4) and cis configurations (cis-N2O4) and O4S2). High-frequency and -field EPR (HFEPR) spectroscopy has been applied to determine the ZFS parameters of two of these compounds, MnL(trans-N2O4) and MnL(O4S2). While at X-band EPR, the axial-component of the ZFS tensor, D, was estimated to be +0.47 cm(-1) for MnL(O4S2), and a D-value of +2.289(5) cm(-1) was determined by HFEPR, which is the largest D-magnitude ever measured for a Mn(IV) complex. A moderate D value of -0.997(6) cm(-1) has been found for MnL(trans-N2O4). Quantum chemical calculations based on two theoretical frameworks (the Density Functional Theory based on a coupled perturbed approach (CP-DFT) and the hybrid Ligand-Field DFT (LF-DFT)) have been performed to define appropriate methodologies to calculate the ZFS tensor for Mn(IV) centers, to predict the orientation of the magnetic axes with respect to the molecular ones, and to define and quantify the physical origin of the different contributions to the ZFS. Except in the case of MnL(trans-N2O4), the experimental and calculated D values are in good agreement, and the sign of D is well predicted, LF-DFT being more satisfactory than CP-DFT. The calculations performed on MnL(cis-N2O4) are consistent with the orientation of the principal anisotropic axis determined by single-crystal EPR, validating the calculated ZFS tensor orientation. The different contributions to D were analyzed demonstrating that the d-d transitions mainly govern D in Mn(IV) ion. However, a deep analysis evidences that many factors enter into the game, explaining why no obvious magnetostructural correlations can be drawn in this series of Mn(IV) complexes.
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Affiliation(s)
- Matija Zlatar
- Center for Chemistry, Institute of Chemistry, Technology and Metallurgy, University of Belgrade , Njegoševa 12, P.O. Box 815, 11001 Belgrade, Serbia
| | - Maja Gruden
- Faculty of Chemistry, University of Belgrade , Studentski trg 12-16, 11001 Belgrade, Serbia
| | - Olga Yu Vassilyeva
- Department of Chemistry, Taras Shevchenko National University of Kyiv , 64/13 Volodymyrska str., Kyiv 01601, Ukraine
| | - Elena A Buvaylo
- Department of Chemistry, Taras Shevchenko National University of Kyiv , 64/13 Volodymyrska str., Kyiv 01601, Ukraine
| | - A N Ponomarev
- Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf (HZDR), D-01328 Dresden, Saxony, Germany
| | - S A Zvyagin
- Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf (HZDR), D-01328 Dresden, Saxony, Germany
| | - J Wosnitza
- Dresden High Magnetic Field Laboratory (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf (HZDR), D-01328 Dresden, Saxony, Germany.,Institut für Festkörperphysik, Technische Universität Dresden , D-01062 Dresden, Saxony, Germany
| | - J Krzystek
- National High Magnetic Field Laboratory (NHMFL), Florida State University , Tallahassee, Florida 32310, United States
| | - Pablo Garcia-Fernandez
- Departamento de Ciencias de la Tierra y Física de la Materia Condensada, Universidad de Cantabria , Avenida de los Castros s/n, 39005 Santander, Cantabria, Spain
| | - Carole Duboc
- Département de Chimie Moléculaire, Université Grenoble Alpes/CNRS, UMR-5250 , BP-53, 38041 Grenoble Cedex 9, France
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88
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Pladzyk A, Ozarowski A, Ponikiewski Ł. Crystal and electronic structures of Ni(II) silanethiolates containing flexible diamine ligands. Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2015.10.034] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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89
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Ozarowski A, Calzado CJ, Sharma RP, Kumar S, Jezierska J, Angeli C, Spizzo F, Ferretti V. Metal–Metal Interactions in Trinuclear Copper(II) Complexes [Cu3(RCOO)4(H2TEA)2] and Binuclear [Cu2(RCOO)2(H2TEA)2]. Syntheses and Combined Structural, Magnetic, High-Field Electron Paramagnetic Resonance, and Theoretical Studies. Inorg Chem 2015; 54:11916-34. [DOI: 10.1021/acs.inorgchem.5b02199] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Andrew Ozarowski
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Carmen J. Calzado
- Departamento de Química Física, Universidad de Sevilla, c/Prof. García González, s/n, 41012 Sevilla, Spain
| | - Raj Pal Sharma
- Department of Chemistry, Panjab University, Chandigarh 160014, India
| | - Santosh Kumar
- Department of Chemistry, Panjab University, Chandigarh 160014, India
| | - Julia Jezierska
- Faculty of Chemistry, Wroclaw University, 14 F. Joliot Curie Str., 50-383 Wroclaw, Poland
| | | | - Federico Spizzo
- Dipartimento di Fisica e Scienze della Terra, Università di Ferrara, Via Saragat 1, I-44122 Ferrara, Italy
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90
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Nguyen TN, Wernsdorfer W, Shiddiq M, Abboud KA, Hill S, Christou G. Supramolecular aggregates of single-molecule magnets: exchange-biased quantum tunneling of magnetization in a rectangular [Mn 3] 4 tetramer. Chem Sci 2015; 7:1156-1173. [PMID: 29896376 PMCID: PMC5952871 DOI: 10.1039/c5sc02599k] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2015] [Accepted: 11/01/2015] [Indexed: 11/22/2022] Open
Abstract
Exchange-biased QTM within a magnetically-supramolecular tetramer of Mn3 single-molecule magnets with spin S = 6 has been analyzed.
The syntheses and properties of four magnetically-supramolecular oligomers of triangular Mn3 units are reported: dimeric [Mn6O2(O2CMe)8(CH3OH)2(pdpd)2] (3) and [Mn6O2(O2CMe)8(py)2(pdpd)2](ClO4)2 (4), and tetrameric [Mn12O4(O2CR)12(pdpd)6](ClO4)4 (R = Me (5), tBu (6)). They were all obtained employing 3-phenyl-1,5-di(pyridin-2-yl)pentane-1,5-dione dioxime (pdpdH2), either in direct synthesis reactions involving oxidation of MnII salts or in metathesis reactions with the preformed complex [Mn3O(O2CMe)6(py)3](ClO4) (1); complex 6 was then obtained by carboxylate substitution on complex 5. Complexes 3 and 4 contain two [MnIII2MnII(μ3-O)]6+ and [MnIII3(μ3-O)]7+ units, respectively, linked by two pdpd2– groups. Complexes 5 and 6 contain four [MnIII3(μ3-O)]7+ units linked by six pdpd2– groups into a rectangular tetramer [MnIII3]4. Solid-state dc magnetic susceptibility studies showed that the Mn3 subunits in 3 and 4 have a ground-state spin of S = 3/2 and S = 2, respectively, while the Mn3 subunits in 5 and 6 possess an S = 6 ground state. Complexes 5 and 6 exhibit frequency-dependent out-of-phase (χ′′M) ac susceptibility signals indicating 5 and 6 to be tetramers of Mn3 single-molecule magnets (SMMs). High-frequency EPR studies of a microcrystalline powder sample of 5·2CH2Cl2 provided precise spin Hamiltonian parameters of D = –0.33 cm–1, |E| = 0.03 cm–1, B04 = –8.0 × 10–5 cm–1, and g = 2.0. Magnetization vs. dc field sweeps on a single crystal of 5·xCH2Cl2 gave hysteresis loops below 1 K that exhibit exchange-biased quantum tunneling of magnetization (QTM) steps with a bias field of 0.19 T. Simulation of the loops determined that each Mn3 unit is exchange-coupled to the two neighbors linked to it by the pdpd2– linkers, with an antiferromagnetic inter-Mn3 exchange interaction of J/kB = –0.011 K (Ĥ = –2Jŝi·ŝj convention). The work demonstrates a rational approach to synthesizing magnetically-supramolecular aggregates of SMMs as potential multi-qubit systems for quantum computing.
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Affiliation(s)
- Tu N Nguyen
- Department of Chemistry , University of Florida , Gainesville , Florida 32611-7200 , USA .
| | | | - Muhandis Shiddiq
- National High Magnetic Field Laboratory and Department of Physics , Florida State University , Tallahassee , Florida 32310 , USA
| | - Khalil A Abboud
- Department of Chemistry , University of Florida , Gainesville , Florida 32611-7200 , USA .
| | - Stephen Hill
- National High Magnetic Field Laboratory and Department of Physics , Florida State University , Tallahassee , Florida 32310 , USA
| | - George Christou
- Department of Chemistry , University of Florida , Gainesville , Florida 32611-7200 , USA .
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91
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Krzystek J, Telser J, Li J, Subramanian MA. Magnetic Properties and Electronic Structure of Manganese-Based Blue Pigments: A High-Frequency and -Field EPR Study. Inorg Chem 2015; 54:9040-5. [DOI: 10.1021/acs.inorgchem.5b01306] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- J. Krzystek
- National
High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Joshua Telser
- Department
of Biological, Chemical, and Physical Sciences, Roosevelt University, Chicago, Illinois 60605, United States
| | - Jun Li
- Department
of Chemistry, Oregon State University, Corvallis, Oregon 97331, United States
| | - M. A. Subramanian
- Department
of Chemistry, Oregon State University, Corvallis, Oregon 97331, United States
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92
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Brown C, Krzystek J, Achey R, Lita A, Fu R, Meulenberg RW, Polinski M, Peek N, Wang Y, van de Burgt LJ, Profeta S, Stiegman AE, Scott SL. Mechanism of Initiation in the Phillips Ethylene Polymerization Catalyst: Redox Processes Leading to the Active Site. ACS Catal 2015. [DOI: 10.1021/acscatal.5b00927] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Carole Brown
- Department
of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - J. Krzystek
- National High
Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
| | - Randall Achey
- Department
of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Adrian Lita
- Department
of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Riqiang Fu
- National High
Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
| | - Robert W. Meulenberg
- Department
of Physics and Astronomy, University of Maine, Orono, Maine 04469, United States
| | - Matthew Polinski
- Department
of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Nathan Peek
- Department
of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Youhong Wang
- Department
of Chemical Engineering, University of California, Santa Barbara, California 93106, United States
| | - Lambertus J. van de Burgt
- Department
of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Salvatore Profeta
- Department
of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - A. E. Stiegman
- Department
of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Susannah L. Scott
- Department
of Chemical Engineering, University of California, Santa Barbara, California 93106, United States
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93
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Cazacu M, Shova S, Soroceanu A, Machata P, Bucinsky L, Breza M, Rapta P, Telser J, Krzystek J, Arion VB. Charge and Spin States in Schiff Base Metal Complexes with a Disiloxane Unit Exhibiting a Strong Noninnocent Ligand Character: Synthesis, Structure, Spectroelectrochemistry, and Theoretical Calculations. Inorg Chem 2015; 54:5691-706. [DOI: 10.1021/acs.inorgchem.5b00229] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Maria Cazacu
- “Petru Poni” Institute of Macromolecular Chemistry, Alea Gr. Ghica Voda 41A, 700487 Iasi, Romania
| | - Sergiu Shova
- “Petru Poni” Institute of Macromolecular Chemistry, Alea Gr. Ghica Voda 41A, 700487 Iasi, Romania
| | - Alina Soroceanu
- “Petru Poni” Institute of Macromolecular Chemistry, Alea Gr. Ghica Voda 41A, 700487 Iasi, Romania
| | - Peter Machata
- Institute of Physical Chemistry and Chemical Physics, Faculty of
Chemical and Food Technology, Slovak University of Technology, Radlinského
9, SK-81237 Bratislava, Slovak Republic
| | - Lukas Bucinsky
- Institute of Physical Chemistry and Chemical Physics, Faculty of
Chemical and Food Technology, Slovak University of Technology, Radlinského
9, SK-81237 Bratislava, Slovak Republic
| | - Martin Breza
- Institute of Physical Chemistry and Chemical Physics, Faculty of
Chemical and Food Technology, Slovak University of Technology, Radlinského
9, SK-81237 Bratislava, Slovak Republic
| | - Peter Rapta
- Institute of Physical Chemistry and Chemical Physics, Faculty of
Chemical and Food Technology, Slovak University of Technology, Radlinského
9, SK-81237 Bratislava, Slovak Republic
| | - Joshua Telser
- Department of Biological, Chemical and
Physical Sciences, Roosevelt University, 430 South Michigan Avenue, Chicago, Illinois 60605 United States
| | - J. Krzystek
- National
High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310 United States
| | - Vladimir B. Arion
- Faculty of Chemistry, Institute of Inorganic
Chemistry, University of Vienna, Währinger Strasse 42, A-1090 Vienna, Austria
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94
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Nguyen TN, Shiddiq M, Ghosh T, Abboud KA, Hill S, Christou G. Covalently Linked Dimer of Mn3 Single-Molecule Magnets and Retention of Its Structure and Quantum Properties in Solution. J Am Chem Soc 2015; 137:7160-8. [PMID: 26027646 DOI: 10.1021/jacs.5b02677] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
[Mn3O(O2CMe)3(dpd)3/2)]2(I3)2 has been obtained from the reaction of 1,3-di(pyridin-2-yl)propane-1,3-dione dioxime (dpdH2) with triangular [Mn(III)3O(O2CMe)(py)3](ClO4). It comprises two [Mn(III)3O](7+) triangular units linked covalently by three dioximate ligands into a [Mn3]2 dimer. Solid state dc and ac magnetic susceptibility measurements reveal that each Mn3 subunit of the dimer is a separate single-molecule magnet (SMM) with an S = 6 ground state and that the two SMM units are very weakly ferromagnetically exchange coupled. High-frequency EPR spectroscopy on a single crystal displays signal splittings indicative of quantum superposition/entanglement of the two SMMs, and parallel studies on MeCN/toluene (1:1) frozen solutions reveal the same spectral features. The dimer thus retains its structure and inter-Mn3 coupling upon dissolution. This work establishes that covalently linked molecular oligomers of exchange-coupled SMMs can be prepared that retain their oligomeric nature and attendant inter-SMM quantum mechanical coupling in solution, providing a second phase for their study and demonstrating the feasibility of using solution methods for their deposition on surfaces and related substrates for study.
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Affiliation(s)
- Tu N Nguyen
- †Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
| | - Muhandis Shiddiq
- ‡National High Magnetic Field Laboratory and Department of Physics, Florida State University, Tallahassee, Florida 32310, United States
| | - Tuhin Ghosh
- †Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
| | - Khalil A Abboud
- †Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
| | - Stephen Hill
- ‡National High Magnetic Field Laboratory and Department of Physics, Florida State University, Tallahassee, Florida 32310, United States
| | - George Christou
- †Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States
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95
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Zienkiewicz M, Jabłońska-Wawrzycka A, Szlachetko J, Kayser Y, Stadnicka K, Sawka-Dobrowolska W, Jezierska J, Barszcz B, Sá J. Effective catalytic disproportionation of aqueous H2O2 with di- and mono-nuclear manganese(II) complexes containing pyridine alcohol ligands. Dalton Trans 2015; 43:8599-608. [PMID: 24406400 DOI: 10.1039/c3dt53288g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The two novel manganese(II) complexes with 2-hydroxymethylpyridine (2-CH2OHpy) {[Mn2(μ-Cl)2(2-CH2OHpy)4]Cl2·2H2O (1)} and 2-hydroxyethylpyridine (2-(CH2)2OHpy) {[Mn(2-(CH2)2OHpy)2(NCS)2] (2)} were synthesized and characterized by means of X-ray diffraction, IR, EPR, HF EPR spectroscopy, magnetic and TG/DTG data. The complexes show catalase-like activity in neutral aqueous solution since they were able to disproportionate H2O2 to harmless H2O and O2. Both complexes act as true catalysts since they reverted to their original form after depleting all the H2O2, as suggested by the operando resonant inelastic X-ray spectroscopy (RIXS) measurements.
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Affiliation(s)
- M Zienkiewicz
- Institute of Chemistry, Jan Kochanowski University in Kielce, 15G Swiętokrzyska Str., 25-406 Kielce, Poland.
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96
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Ramachandran V, van Tol J, McKenna AM, Rodgers RP, Marshall AG, Dalal NS. High Field Electron Paramagnetic Resonance Characterization of Electronic and Structural Environments for Paramagnetic Metal Ions and Organic Free Radicals in Deepwater Horizon Oil Spill Tar Balls. Anal Chem 2015; 87:2306-13. [DOI: 10.1021/ac504080g] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Vasanth Ramachandran
- Department
of Chemistry and Biochemistry, Florida State University, 95 Chieftain
Way, Tallahassee, Florida 32306, United States
| | - Johan van Tol
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United States
| | - Amy M. McKenna
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United States
| | - Ryan P. Rodgers
- Department
of Chemistry and Biochemistry, Florida State University, 95 Chieftain
Way, Tallahassee, Florida 32306, United States
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United States
| | - Alan G. Marshall
- Department
of Chemistry and Biochemistry, Florida State University, 95 Chieftain
Way, Tallahassee, Florida 32306, United States
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United States
| | - Naresh S. Dalal
- Department
of Chemistry and Biochemistry, Florida State University, 95 Chieftain
Way, Tallahassee, Florida 32306, United States
- National High Magnetic Field Laboratory, 1800 East Paul Dirac Drive, Tallahassee, Florida 32310, United States
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97
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Poole KM, Korabik M, Shiddiq M, Mitchell KJ, Fournet A, You Z, Christou G, Hill S, Hołyńska M. A New “Offset” Analogue of the Classical Oxime-Bridged [MnIII6] Single-Molecule Magnets. Inorg Chem 2015; 54:1883-9. [DOI: 10.1021/ic502787q] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Katye M. Poole
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Maria Korabik
- Faculty of Chemistry, University of Wrocław, F. Joliot Curie 14, 50 383 Wrocław, Poland
| | - Muhandis Shiddiq
- Department
of Physics, Florida State University, Tallahassee, Florida 32306, United States
- National High Magnetic Field Laboratory, 1800 E. Paul Dirac Drive, Tallahassee, Florida 32310, United States
| | - Kylie J. Mitchell
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Adeline Fournet
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Zhiliang You
- Fachbereich Chemie and Wissenschaftliches
Zentrum für Materialwissenschaften (WZMW), Philipps-Universität Marburg, Hans-Meerwein-Straße, D-35032 Marburg, Germany
| | - George Christou
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
| | - Stephen Hill
- Department
of Physics, Florida State University, Tallahassee, Florida 32306, United States
- National High Magnetic Field Laboratory, 1800 E. Paul Dirac Drive, Tallahassee, Florida 32310, United States
| | - Małgorzata Hołyńska
- Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States
- Fachbereich Chemie and Wissenschaftliches
Zentrum für Materialwissenschaften (WZMW), Philipps-Universität Marburg, Hans-Meerwein-Straße, D-35032 Marburg, Germany
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98
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Reger DL, Pascui AE, Smith MD, Jezierska J, Ozarowski A. Syntheses, Structural, Magnetic, and Electron Paramagnetic Resonance Studies of Monobridged Cyanide and Azide Dinuclear Copper(II) Complexes: Antiferromagnetic Superexchange Interactions. Inorg Chem 2015; 54:1487-500. [PMID: 25602445 DOI: 10.1021/ic502485p] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Daniel L. Reger
- Department
of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Andrea E. Pascui
- Department
of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Mark D. Smith
- Department
of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, United States
| | - Julia Jezierska
- Faculty
of Chemistry, University of Wrocław 50-383 Wrocław, Poland
| | - Andrew Ozarowski
- National
High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
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99
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Nehrkorn J, Schnegg A, Holldack K, Stoll S. General magnetic transition dipole moments for electron paramagnetic resonance. PHYSICAL REVIEW LETTERS 2015; 114:010801. [PMID: 25615456 DOI: 10.1103/physrevlett.114.010801] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Indexed: 06/04/2023]
Abstract
We present general expressions for the magnetic transition rates in electron paramagnetic resonance (EPR) experiments of anisotropic spin systems in the solid state. The expressions apply to general spin centers and arbitrary excitation geometry (Voigt, Faraday, and intermediate). They work for linear and circular polarized as well as unpolarized excitation, and for crystals and powders. The expressions are based on the concept of the (complex) magnetic transition dipole moment vector. Using the new theory, we determine the parities of ground and excited spin states of high-spin (S=5/2) Fe(III) in hemin from the polarization dependence of experimental EPR line intensities.
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Affiliation(s)
- Joscha Nehrkorn
- Berlin Joint EPR Laboratory, Institut für Silizium-Photovoltaik, Helmholtz-Zentrum Berlin für Materialien und Energie, D-12489 Berlin, Germany
| | - Alexander Schnegg
- Berlin Joint EPR Laboratory, Institut für Silizium-Photovoltaik, Helmholtz-Zentrum Berlin für Materialien und Energie, D-12489 Berlin, Germany
| | - Karsten Holldack
- Institut für Methoden und Instrumentierung der Forschung mit Synchrotronstrahlung, Helmholtz-Zentrum Berlin für Materialien und Energie, D-12489 Berlin, Germany
| | - Stefan Stoll
- Department of Chemistry, University of Washington, Seattle, Washington 98195, USA
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100
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Wojciechowska A, Janczak J, Staszak Z, Duczmal M, Zierkiewicz W, Tokar J, Ozarowski A. Structural, spectroscopic, magnetic behavior and DFT investigations ofl-tyrosinato nickel(ii) coordination polymer. NEW J CHEM 2015. [DOI: 10.1039/c5nj00972c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The 4,4′-bpy molecules are weakly bonded with nickel(ii) ions in 1Dl-tyrosinato coordination polymer.
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Affiliation(s)
| | - Jan Janczak
- Institute of Low Temperature and Structure Research Polish Academy of Sciences
- 50-422 Wroclaw
- Poland
| | - Zbigniew Staszak
- Faculty of Computer Science and Management
- Wroclaw University of Technology
- 50-370 Wroclaw
- Poland
| | - Marek Duczmal
- Faculty of Chemistry
- Wroclaw University of Technology
- 50-370 Wroclaw
- Poland
| | - Wiktor Zierkiewicz
- Faculty of Chemistry
- Wroclaw University of Technology
- 50-370 Wroclaw
- Poland
| | - Jadwiga Tokar
- Faculty of Chemistry
- Wroclaw University of Technology
- 50-370 Wroclaw
- Poland
| | - Andrew Ozarowski
- National High Magnetic Field Laboratory
- Florida State University
- Tallahassee
- USA
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