51
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Zoufalý P, Čižmár E, Kuchár J, Herchel R. The Structural and Magnetic Properties of Fe II and Co II Complexes with 2-(furan-2-yl)-5-pyridin-2-yl-1,3,4-oxadiazole. Molecules 2020; 25:molecules25020277. [PMID: 31936620 PMCID: PMC7024161 DOI: 10.3390/molecules25020277] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Revised: 01/06/2020] [Accepted: 01/07/2020] [Indexed: 11/16/2022] Open
Abstract
Two novel coordination compounds containing heterocyclic bidentate N,N-donor ligand 2-(furan-2-yl)-5-(pyridin-2-yl)-1,3,4-oxadiazole (fpo) were synthesized. A general formula for compounds originating from perchlorates of iron, cobalt, and fpo can be written as: [M(fpo)2(H2O)2](ClO4)2 (M = Fe(II) for (1) Co(II) for (2)). The characterization of compounds was performed by general physico-chemical methods-elemental analysis (EA), Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance (NMR) in case of organics, and single crystal X-ray diffraction (sXRD). Moreover, magneto-chemical properties were studied employing measurements in static field (DC) for 1 and X-band EPR (Electron paramagnetic resonance), direct current (DC), and alternating current (AC) magnetic measurements in case of 2. The analysis of DC magnetic properties revealed a high spin arrangement in 1, significant rhombicity for both complexes, and large magnetic anisotropy in 2 (D = -21.2 cm-1). Moreover, 2 showed field-induced slow relaxation of the magnetization (Ueff = 65.3 K). EPR spectroscopy and ab initio calculations (CASSCF/NEVPT2) confirmed the presence of easy axis anisotropy and the importance of the second coordination sphere.
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Affiliation(s)
- Pavel Zoufalý
- Department of Inorganic Chemistry, Faculty of Science, Palacký University, 17. Listopadu 12, CZ-771 46 Olomouc, Czech Republic; (P.Z.); or
| | - Erik Čižmár
- Institute of Physics, Faculty of Science, P.J. Šafárik University in Košice, Park Angelinum 9, SK-041 54 Košice, Slovakia;
| | - Juraj Kuchár
- Department of Inorganic Chemistry, Faculty of Science, Palacký University, 17. Listopadu 12, CZ-771 46 Olomouc, Czech Republic; (P.Z.); or
- Department of Inorganic Chemistry, Institute of Chemistry, Faculty of Science, P.J. Šafárik University in Košice, Moyzesova 11, SK-041 54 Košice, Slovakia
| | - Radovan Herchel
- Department of Inorganic Chemistry, Faculty of Science, Palacký University, 17. Listopadu 12, CZ-771 46 Olomouc, Czech Republic; (P.Z.); or
- Correspondence: ; Tel.: +420-58563-4435
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52
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Joshi RP, Phillips JJ, Mitchell KJ, Christou G, Jackson KA, Peralta JE. Accuracy of density functional theory methods for the calculation of magnetic exchange couplings in binuclear iron(III) complexes. Polyhedron 2020. [DOI: 10.1016/j.poly.2019.114194] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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53
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Oña OB, Alcoba DR, Massaccesi GE, Torre A, Lain L, Melo JI, Oliva-Enrich JM, Peralta JE. Magnetic properties of closo-carborane-based Co(II) single-ion complexes with O, S, Se, and Te bridging atoms. Polyhedron 2020. [DOI: 10.1016/j.poly.2019.114257] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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54
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Das M, Basak D, Trávníček Z, Vančo J, Ray D. Entrapment of a Pseudo-Tetrahedral Co II Center by Thioether Sulfur Bound {Co 2 (μ-L)} Fragments: Synthesis, Field-Induced Single-Ion Magnetism and Catechol Oxidase Mimicking Activity. Chem Asian J 2019; 14:3898-3914. [PMID: 31545553 DOI: 10.1002/asia.201901109] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Revised: 09/22/2019] [Indexed: 11/06/2022]
Abstract
Simultaneous incorporation of both CoII and CoIII ions within a new thioether S-bearing phenol-based ligand system, H3 L (2,6-bis-[{2-(2-hydroxyethylthio)ethylimino}methyl]-4-methylphenol) formed [Co5 ] aggregates [CoII CoIII 4 L2 (μ-OH)2 (μ1,3 -O2 CCH3 )2 ](ClO4 )4 ⋅H2 O (1) and [CoII CoIII 4 L2 (μ-OH)2 (μ1,3 -O2 CC2 H5 )2 ](ClO4 )4 ⋅H2 O (2). The magnetic studies revealed axial zero-field splitting (ZFS) parameter, D/hc=-23.6 and -24.3 cm-1 , and E/D=0.03 and 0.00, respectively for 1 and 2. Dynamic magnetic data confirmed the complexes as SIMs with Ueff /kB =30 K (1) and 33 K (2), and τ0 =9.1×10-8 s (1), and 4.3×10-8 s (2). The larger atomic radius of S compared to N gave rise to less variation in the distortion of tetrahedral geometry around central CoII centers, thus affecting the D and Ueff /kB values. Theoretical studies also support the experimental findings and reveal the origin of the anisotropy parameters. In solutions, both 1 and 2 which produce {CoIII 2 (μ-L)} units, display solvent-dependent catechol oxidation behavior toward 3,5-di-tert-butylcatechol in air. The presence of an adjacent CoIII ion tends to assist the electron transfer from the substrate to the metal ion center, enhancing the catalytic oxidation rate.
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Affiliation(s)
- Manisha Das
- Department of Chemistry, Indian Institute of Technology, Kharagpur, 721 302, India
| | - Dipmalya Basak
- Department of Chemistry, Indian Institute of Technology, Kharagpur, 721 302, India
| | - Zdeněk Trávníček
- Division of Biologically Active Complexes and Molecular Magnets, Faculty of Science, Palacký University, Šlechtitelů 27, 783 71, Olomouc, Czech Republic
| | - Ján Vančo
- Division of Biologically Active Complexes and Molecular Magnets, Faculty of Science, Palacký University, Šlechtitelů 27, 783 71, Olomouc, Czech Republic
| | - Debashis Ray
- Department of Chemistry, Indian Institute of Technology, Kharagpur, 721 302, India
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55
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Wu T, Zhai YQ, Deng YF, Chen WP, Zhang T, Zheng YZ. Correlating magnetic anisotropy with the subtle coordination geometry variation of a series of cobalt(ii)-sulfonamide complexes. Dalton Trans 2019; 48:15419-15426. [PMID: 31065655 DOI: 10.1039/c9dt01296f] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Systematic substitution on the N-(pyridine-2-ylmethyl)-sulfonamide ligand leads to the subtle variation of the CoN4 coordination geometry in a series of cobalt(ii) complexes sharing the common formula of Co[R1(C6N2H5)R2]2, where R1 = H, R2 = 4-tert-butylphenylsulfonyl (tBuphs) 1, R2 = 5-(dimethylamino)naphthalen-1-ylsulfonyl (DNps) 2, R2 = mesitylsulfonyl (Ms) 3, R2 = tosyl (Tos) 4, and R2 = naphthalen-1-ylsulfonyl (Nps) 5; R1 = Me, R2 = tBuphs 6. Magnetic studies show that the axial zero-field splitting parameter (D) is subtlely correlated with the coordination geometric variation subjected to the peripheral substituted groups. Specifically, the distortion from the ideal tetrahedral geometry (Td symmetry) to the seesaw geometry (D2d symmetry) increases uniaxial magnetic anisotropy. The degree of distortion measured by the continuous symmetry measure (CSM) shows that a narrow interval of CSM (6-7), which corresponds to 14-15 degree deviation from the standard tetrahedron, is ideal for maximising the D value in this coordination geometry, while the direction of the D tensor is less sensitive to such a structural variation.
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Affiliation(s)
- Tao Wu
- Frontier Institute of Science and Technology (FIST), State Key Laboratory for Mechanical Behavior of Materials, MOE Key Laboratory for Nonequilibrium Synthesis of Condensed Matter, Xi'an Key Laboratory of Sustainable Energy and Materials Chemistry and School of Science Xi'an Jiaotong University, 99 Yanxiang Road, Xi'an, Shaanxi 710054, P. R. China.
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56
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Sarkar A, Tewary S, Sinkar S, Rajaraman G. Magnetic Anisotropy in Co
II
X
4
(X=O, S, Se) Single‐Ion Magnets: Role of Structural Distortions versus Heavy Atom Effect. Chem Asian J 2019; 14:4696-4704. [DOI: 10.1002/asia.201901140] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Revised: 09/04/2019] [Indexed: 11/10/2022]
Affiliation(s)
- Arup Sarkar
- Department of ChemistryIndian Institute of Technology Bombay Powai Mumbai 400076 India
| | - Subrata Tewary
- Department of ChemistryIndian Institute of Technology Bombay Powai Mumbai 400076 India
- Current address: RIKEN Center for Computational Science 7-1-26, Minatojima-minami-machi Chuo-ku Kobe 650-0047 Japan
| | - Shwetali Sinkar
- Department of ChemistryIndian Institute of Technology Bombay Powai Mumbai 400076 India
| | - Gopalan Rajaraman
- Department of ChemistryIndian Institute of Technology Bombay Powai Mumbai 400076 India
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57
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Keshavarz F. Chemical Kinetics Approves the Occurrence of C ( 3P j) Reaction with H 2O. J Phys Chem A 2019; 123:5877-5892. [PMID: 31268710 DOI: 10.1021/acs.jpca.9b03492] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Although both atomic carbon and water are omnipresent in human life, there is a debate about the possibility of carbon reaction with water. Some low-temperature spectroscopic investigations have rejected the reaction, whereas some room-temperature experiments and theoretical studies have accepted the possibility of the reaction by reporting rate coefficients ranging from 105 to 109 L mol-1 s-1. This study provides new lines of evidence about the reaction through exploration of the reaction mechanism using the CCSD(T) method and solving the corresponding master equation by following two main approaches. According to the results, the rate coefficient of the reaction is significantly influenced by the tunneling and hindered rotation effects, in addition to the selected total angular momentum (J). Furthermore, the total rate coefficient of the reaction increases dramatically (from 107 to 1011 L mol-1 s-1) with the rise of temperature from 100 to 4000 K, while the total rate coefficient is insensitive to pressure (0.1-10 atm). Despite some differences between the results of the two approaches, the rate coefficients of both methods are consistent with the previously reported rate coefficients. Also, in agreement with the previous studies, the major products are 2HOC + 2H and 2HCO + 2H. In general, the findings approve the occurrence of the title reaction and indicate that the mentioned conflict is due to the sensitivity of the reaction to the investigated temperature and J level. The sensitivity does not permit low-temperature spectroscopic studies to detect any products and varies the measured and calculated rate coefficients.
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Affiliation(s)
- Fatemeh Keshavarz
- Department of Chemistry, College of Science , Shiraz University , Shiraz 71946-84795 , Iran
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58
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Coste SC, Pearson TJ, Freedman DE. Magnetic Anisotropy in Heterobimetallic Complexes. Inorg Chem 2019; 58:11893-11902. [DOI: 10.1021/acs.inorgchem.9b01459] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Scott C. Coste
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Tyler J. Pearson
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Danna E. Freedman
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
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59
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Tripathi S, Vaidya S, Ansari KU, Ahmed N, Rivière E, Spillecke L, Koo C, Klingeler R, Mallah T, Rajaraman G, Shanmugam M. Influence of a Counteranion on the Zero-Field Splitting of Tetrahedral Cobalt(II) Thiourea Complexes. Inorg Chem 2019; 58:9085-9100. [DOI: 10.1021/acs.inorgchem.9b00632] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shalini Tripathi
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, India
| | - Shefali Vaidya
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, India
| | - Kamal Uddin Ansari
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, India
| | - Naushad Ahmed
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, India
| | - Eric Rivière
- Institut de Chimie Moléculaire et des Matériaux d’Orsay, CNRS, Université Paris Sud, Université Paris Saclay, 91405 Orsay Cedex, France
| | | | | | | | - Talal Mallah
- Institut de Chimie Moléculaire et des Matériaux d’Orsay, CNRS, Université Paris Sud, Université Paris Saclay, 91405 Orsay Cedex, France
| | - Gopalan Rajaraman
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, India
| | - Maheswaran Shanmugam
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, India
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60
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Guo FS, Bar AK, Layfield RA. Main Group Chemistry at the Interface with Molecular Magnetism. Chem Rev 2019; 119:8479-8505. [PMID: 31059235 DOI: 10.1021/acs.chemrev.9b00103] [Citation(s) in RCA: 121] [Impact Index Per Article: 24.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Innovative synthetic coordination and, increasingly, organometallic chemistry are at the heart of advances in molecular magnetism. Smart ligand design is essential for implementing controlled modifications to the electronic structure and magnetic properties of transition metal and f-element compounds, and many important recent developments use nontraditional ligands based on low-coordinate main group elements to drive the field forward. This review charts progress in molecular magnetism from the perspective of ligands in which the donor atoms range from low-coordinate 2p elements-particularly carbon but also boron and nitrogen-to the heavier p-block elements such as phosphorus, arsenic, antimony, and even bismuth. Emphasis is placed on the role played by novel main group ligands in addressing magnetic anisotropy of transition metal and f-element compounds, which underpins the development of single-molecule magnets (SMMs), a family of magnetic materials that can retain magnetization in the absence of a magnetic field below a blocking temperature. Nontraditional p-block donor atoms, with their relatively diffuse valence orbitals and more diverse bonding characteristics, also introduce scope for tuning the spin-orbit coupling properties and metal-ligand covalency in molecular magnets, which has implications in areas such as magnetic exchange coupling and spin crossover phenomena. The chemistry encompasses transition metals, lanthanides, and actinides and describes recently discovered molecular magnets that can be regarded, currently, as defining the state of the art. This review identifies that main group chemistry at the interface molecular magnetism is an area with huge potential to deliver new types of molecular magnets with previously unseen properties and applications.
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Affiliation(s)
- Fu-Sheng Guo
- Department of Chemistry, School of Life Sciences , University of Sussex , Brighton BN1 9QJ , United Kingdom
| | - Arun Kumar Bar
- Department of Chemistry, School of Life Sciences , University of Sussex , Brighton BN1 9QJ , United Kingdom
| | - Richard A Layfield
- Department of Chemistry, School of Life Sciences , University of Sussex , Brighton BN1 9QJ , United Kingdom
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61
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Reynolds RD, Shiozaki T. Zero-Field Splitting Parameters from Four-Component Relativistic Methods. J Chem Theory Comput 2019; 15:1560-1571. [PMID: 30689942 DOI: 10.1021/acs.jctc.8b00910] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report an approach for determination of zero-field splitting parameters from four-component relativistic calculations. Our approach involves neither perturbative treatment of spin-orbit interaction nor truncation of the spin-orbit coupled states. We make use of a multi-state implementation of relativistic complete active space perturbation theory (CASPT2), partially contracted N-electron valence perturbation theory (NEVPT2), and multi-reference configuration interaction theory (MRCI), all with the fully internally contracted ansatz. A mapping is performed from the Dirac Hamiltonian to the pseudospin Hamiltonian, using correlated energies and the magnetic moment matrix elements of the reference wave functions. Direct spin-spin coupling is naturally included through the full 2-electron Breit interaction. Benchmark calculations on chalcogen diatomics and pseudotetrahedral cobalt(II) complexes show accuracy comparable to the commonly used state-interaction with spin-orbit (SI-SO) approach, while tests on a uranium(III) single-ion magnet suggest that for actinide complexes the strengths of our approach through the more robust treatment of spin-orbit effects and the avoidance of state truncation are of greater importance.
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Affiliation(s)
- Ryan D Reynolds
- Department of Chemistry , Northwestern University , 2145 Sheridan Rd. , Evanston , Illinois 60208 , United States
| | - Toru Shiozaki
- Department of Chemistry , Northwestern University , 2145 Sheridan Rd. , Evanston , Illinois 60208 , United States
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62
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de Souza MS, Briganti M, Reis SG, Stinghen D, Bortolot CS, Cassaro RAA, Guedes GP, da Silva FC, Ferreira VF, Novak MA, Soriano S, Totti F, Vaz MGF. Magnetic Cationic Copper(II) Chains and a Mononuclear Cobalt(II) Complex Containing [Ln(hfac) 4] - Blocks as Counterions. Inorg Chem 2019; 58:1976-1987. [PMID: 30644737 DOI: 10.1021/acs.inorgchem.8b02929] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Four new heterospin compounds with molecular formula {[Cu2(hfac)3(TlTrzNIT)2][Ln(hfac)4]} n·C7H16 (LnIII = Gd (1), Tb (2), or Dy (3)) and [Co(hfac)(TlTrzNIT)2][Dy(hfac)4] (4), where hfac is hexafluoroacetylacetonato and TlTrzNIT is the nitronylnitroxide radical 1-( m-tolyl)-1 H-1,2,3-triazole-4-(4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide), were obtained. All structures were determined by single-crystal X-ray diffraction. In compounds 1-3, the TlTrzNIT radical is bridge-coordinated to copper(II) ions, leading to positively charged copper(II)-radical chains containing [Ln(hfac)4]- as counterions. In compound 4, the cobalt(II) ion is coordinated to two TlTrzNIT radicals and one hfac ligand in bidentate mode leading to a mononuclear cationic complex that contains [Dy(hfac)4]- as counterion. Magnetic measurements of all complexes were performed. Magnetic data were fit considering the contributions of the copper(II)-radical chain and a paramagnetic gadolinium(III) ion for 1. The sign and magnitude of the magnetic coupling constants extracted from the fit were confirmed by density functional theory calculations. The obtained spin topology shows an alternated ferro-antiferromagnetic chain. Field-induced single molecule magnet behavior was observed for the Dy derivatives 3 and 4, in agreement with CASSCF calculations performed for the latter system.
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Affiliation(s)
- Mateus S de Souza
- Instituto de Química , Universidade Federal Fluminense , Niterói , Rio de Janeiro , 24020-150 , Brazil
| | - Matteo Briganti
- Department of Chemistry "Ugo Schiff" and INSTM RU University of Florence , 50019 Sesto Fiorentino , Italy
| | - Samira G Reis
- Instituto de Química , Universidade Federal Fluminense , Niterói , Rio de Janeiro , 24020-150 , Brazil
| | - Danilo Stinghen
- Instituto de Química , Universidade Federal Fluminense , Niterói , Rio de Janeiro , 24020-150 , Brazil
| | - Carolina S Bortolot
- Instituto de Química , Universidade Federal Fluminense , Niterói , Rio de Janeiro , 24020-150 , Brazil
| | - Rafael A A Cassaro
- Instituto de Química , Universidade Federal do Rio de Janeiro , Rio de Janeiro , 21941-909 , Brazil
| | - Guilherme P Guedes
- Instituto de Química , Universidade Federal Fluminense , Niterói , Rio de Janeiro , 24020-150 , Brazil
| | - Fernando C da Silva
- Instituto de Química , Universidade Federal Fluminense , Niterói , Rio de Janeiro , 24020-150 , Brazil
| | - Vitor F Ferreira
- Instituto de Química , Universidade Federal Fluminense , Niterói , Rio de Janeiro , 24020-150 , Brazil
| | - Miguel A Novak
- Instituto de Física , Universidade Federal do Rio de Janeiro , Rio de Janeiro , 21941-972 , Brazil
| | - Stéphane Soriano
- Instituto de Física , Universidade Federal Fluminense , Niterói , Rio de Janeiro , 24020-140 , Brazil
| | - Federico Totti
- Department of Chemistry "Ugo Schiff" and INSTM RU University of Florence , 50019 Sesto Fiorentino , Italy
| | - Maria G F Vaz
- Instituto de Química , Universidade Federal Fluminense , Niterói , Rio de Janeiro , 24020-150 , Brazil
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63
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Neese F, Atanasov M, Bistoni G, Maganas D, Ye S. Chemistry and Quantum Mechanics in 2019: Give Us Insight and Numbers. J Am Chem Soc 2019; 141:2814-2824. [PMID: 30629883 PMCID: PMC6728125 DOI: 10.1021/jacs.8b13313] [Citation(s) in RCA: 73] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
![]()
This Perspective revisits Charles
Coulson’s famous statement
from 1959 “give us insight not numbers” in which he
pointed out that accurate computations and chemical understanding
often do not go hand in hand. We argue that today, accurate wave function
based first-principle calculations can be performed on large molecular
systems, while tools are available to interpret the results of these
calculations in chemical language. This leads us to modify Coulson’s
statement to “give us insight and numbers”.
Examples from organic, inorganic, organometallic and surface chemistry
as well as molecular magnetism illustrate the points made.
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Affiliation(s)
- Frank Neese
- Department of Molecular Theory and Spectroscopy , Max Planck Institut für Kohlenforschung , Kaiser-Wilhelm Platz 1 , 45470 Mülheim an der Ruhr , Germany
| | - Mihail Atanasov
- Department of Molecular Theory and Spectroscopy , Max Planck Institut für Kohlenforschung , Kaiser-Wilhelm Platz 1 , 45470 Mülheim an der Ruhr , Germany.,Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences , Akad.G.Bontchevstr, Bl.11 , 1113 Sofia , Bulgaria
| | - Giovanni Bistoni
- Department of Molecular Theory and Spectroscopy , Max Planck Institut für Kohlenforschung , Kaiser-Wilhelm Platz 1 , 45470 Mülheim an der Ruhr , Germany
| | - Dimitrios Maganas
- Department of Molecular Theory and Spectroscopy , Max Planck Institut für Kohlenforschung , Kaiser-Wilhelm Platz 1 , 45470 Mülheim an der Ruhr , Germany
| | - Shengfa Ye
- Department of Molecular Theory and Spectroscopy , Max Planck Institut für Kohlenforschung , Kaiser-Wilhelm Platz 1 , 45470 Mülheim an der Ruhr , Germany
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64
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Oña OB, Alcoba DR, Massaccesi GE, Torre A, Lain L, Melo JI, Oliva-Enrich JM, Peralta JE. Magnetic Properties of Co(II) Complexes with Polyhedral Carborane Ligands. Inorg Chem 2019; 58:2550-2557. [PMID: 30694654 DOI: 10.1021/acs.inorgchem.8b03156] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this work we present a computational analysis of a new family of magnetic Co(II) single-ion complexes with large magnetic anisotropy based on icosahedral and octahedral carborane ligands. In particular, we extend our previous computational work on mononuclear Co(II) complexes with 1,2-(HS)2-1,2-C2B10H10 and 9,12-(HS)2-1,2-C2B10H10 icosahedral o-carborane ligands to a larger set of complexes where the Co(II) ion is doubly chelated by those ligands and by other two positional isomers belonging to the 1,2-dicarba- closo-dodecaborane family. We also describe Co(II) complexes with octahedral ligands derived from 1,2-dicarba- closo-hexaborane and study the effects of replacing a thiol group by a hydroxy group in both polyhedral geometries, as well as the influence of the position of the carbon atoms. On analysis of the results for a total of 20 complexes, our results show that carborane-based Co(II) single-ion compounds present a distorted-tetrahedral geometry, high-spin ground states, and high values for the magnetic anisotropy parameters. We point out which of these would be suitable candidates to be synthesized and used as molecular magnets.
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Affiliation(s)
- Ofelia B Oña
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas , Universidad Nacional de la Plata, CCT La Plata, Consejo Nacional de Investigaciones Científicas y Técnicas , Diag. 113 y 64 (s/n) , Sucursal 4, CC 16, 1900 La Plata , Argentina
| | - Diego R Alcoba
- Departamento de Física, Facultad de Ciencias Exactas y Naturales , Universidad de Buenos Aires , Ciudad Universitaria, 1428 Buenos Aires , Argentina.,Instituto de Física de Buenos Aires , Consejo Nacional de Investigaciones Científicas y Técnicas , Ciudad Universitaria, 1428 Buenos Aires , Argentina
| | - Gustavo E Massaccesi
- Departamento de Ciencias Exactas, Ciclo Básico Común , Universidad de Buenos Aires , Ciudad Universitaria, 1428 Buenos Aires , Argentina
| | - Alicia Torre
- Departamento de Química Física, Facultad de Ciencia y Tecnología , Universidad del País Vasco , Apdo. 644, E-48080 Bilbao , Spain
| | - Luis Lain
- Departamento de Química Física, Facultad de Ciencia y Tecnología , Universidad del País Vasco , Apdo. 644, E-48080 Bilbao , Spain
| | - Juan I Melo
- Departamento de Física, Facultad de Ciencias Exactas y Naturales , Universidad de Buenos Aires , Ciudad Universitaria, 1428 Buenos Aires , Argentina.,Instituto de Física de Buenos Aires , Consejo Nacional de Investigaciones Científicas y Técnicas , Ciudad Universitaria, 1428 Buenos Aires , Argentina
| | - Josep M Oliva-Enrich
- Instituto de Química Física "Rocasolano" , Consejo Superior de Investigaciones Científicas , 28006 Madrid , Spain
| | - Juan E Peralta
- Department of Physics , Central Michigan University , Mount Pleasant , Michigan 48859 , United States
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65
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Ferentinos E, Xu M, Grigoropoulos A, Bratsos I, Raptopoulou CP, Psycharis V, Jiang SD, Kyritsis P. Field-induced slow relaxation of magnetization in the S = 3/2 octahedral complexes trans-[Co{(OPPh 2)(EPPh 2)N} 2(dmf) 2], E = S, Se: effects of Co–Se vs. Co–S coordination. Inorg Chem Front 2019. [DOI: 10.1039/c9qi00135b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Magnetometry studies on octahedral trans-[Co{(OPPh2)(EPPh2)N}2(dmf)2], E = S, Se, complexes.
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Affiliation(s)
- Eleftherios Ferentinos
- Inorganic Chemistry Laboratory
- Department of Chemistry
- National and Kapodistrian University of Athens
- GR-15771 Athens
- Greece
| | - Meixing Xu
- College of Chemistry and Molecular Engineering
- Beijing National Laboratory for Molecular Sciences
- Beijing Key Laboratory of Magnetoelectric Materials and Devices
- Peking University
- Beijing 100871
| | - Alexios Grigoropoulos
- Inorganic Chemistry Laboratory
- Department of Chemistry
- National and Kapodistrian University of Athens
- GR-15771 Athens
- Greece
| | - Ioannis Bratsos
- NCSR “Demokritos”
- Institute of Nanoscience and Nanotechnology
- Athens
- Greece
| | | | - Vassilis Psycharis
- NCSR “Demokritos”
- Institute of Nanoscience and Nanotechnology
- Athens
- Greece
| | - Shang-Da Jiang
- College of Chemistry and Molecular Engineering
- Beijing National Laboratory for Molecular Sciences
- Beijing Key Laboratory of Magnetoelectric Materials and Devices
- Peking University
- Beijing 100871
| | - Panayotis Kyritsis
- Inorganic Chemistry Laboratory
- Department of Chemistry
- National and Kapodistrian University of Athens
- GR-15771 Athens
- Greece
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66
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Fiorini G, Carrella L, Rentschler E, Alborés P. Counter-complementarity control of the weak exchange interaction in a bent {Ni(ii)3} complex with a μ-phenoxide-μ-carboxylate double bridge. NEW J CHEM 2019. [DOI: 10.1039/c9nj03574e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report a combined computational and experimental study of a weak exchange interaction in a bent {Ni(ii)3} complex controlled by counter-complementarity.
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Affiliation(s)
- Guillermo Fiorini
- Departamento de Química Inorgánica
- Analítica y Química Física/INQUIMAE (CONICET)
- Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires
- C1428EHA Buenos Aires
- Argentina
| | - Luca Carrella
- Johannes Gutenberg University Mainz Chemistry
- Institute of Inorganic and Analytical Chemistry
- 55128 Mainz
- Germany
| | - Eva Rentschler
- Johannes Gutenberg University Mainz Chemistry
- Institute of Inorganic and Analytical Chemistry
- 55128 Mainz
- Germany
| | - Pablo Alborés
- Departamento de Química Inorgánica
- Analítica y Química Física/INQUIMAE (CONICET)
- Facultad de Ciencias Exactas y Naturales Universidad de Buenos Aires
- C1428EHA Buenos Aires
- Argentina
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67
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Świtlicka A, Palion-Gazda J, Machura B, Cano J, Lloret F, Julve M. Field-induced slow magnetic relaxation in pseudooctahedral cobalt(ii) complexes with positive axial and large rhombic anisotropy. Dalton Trans 2019; 48:1404-1417. [DOI: 10.1039/c8dt03965h] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The preparation, X-ray crystal structure, spectroscopic and variable-temperature dc and ac magnetic properties of two six-coordinate cobalt(ii) complexes of formula [Co(bim)4(tcm)2] (1) and [Co(bmim)4(tcm)2] (2) are reported.
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Affiliation(s)
- Anna Świtlicka
- Department of Crystallography
- Institute of Chemistry
- University of Silesia
- 40-006 Katowice
- Poland
| | - Joanna Palion-Gazda
- Department of Crystallography
- Institute of Chemistry
- University of Silesia
- 40-006 Katowice
- Poland
| | - Barbara Machura
- Department of Crystallography
- Institute of Chemistry
- University of Silesia
- 40-006 Katowice
- Poland
| | - Joan Cano
- Department of Química Inorgànica/Instituto de Ciencia Molecular (ICMol)
- Facultat de Quimica de la Universitat de València
- 46980 Paterna
- Spain
- Fundació General de la Universitat de València (FGUV)
| | - Francesc Lloret
- Department of Química Inorgànica/Instituto de Ciencia Molecular (ICMol)
- Facultat de Quimica de la Universitat de València
- 46980 Paterna
- Spain
| | - Miguel Julve
- Department of Química Inorgànica/Instituto de Ciencia Molecular (ICMol)
- Facultat de Quimica de la Universitat de València
- 46980 Paterna
- Spain
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68
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Chattopadhyay K, Heras Ojea MJ, Sarkar A, Murrie M, Rajaraman G, Ray D. Trapping of a Pseudotetrahedral Co IIO 4 Core in Mixed-Valence Mixed-Geometry [Co 5] Coordination Aggregates: Synthetic Marvel, Structures, and Magnetism. Inorg Chem 2018; 57:13176-13187. [PMID: 30351068 DOI: 10.1021/acs.inorgchem.8b01577] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A systematic one-step one-pot multicomponent reaction of Co(ClO4)2·6H2O, H3L (2,6-bis((2-(2-hydroxyethylamino)ethylimino)methyl)-4-methylphenol), and readily available carboxylate salts (RCO2Na; R = CH3, C2H5) resulted in the two structurally novel coordination aggregates [CoIICoIII4L2(μ1,3-O2CCH3)2(μ-OH)2](ClO4)4·4H2O (1) and [CoIICoIII4L2(μ1,3-O2CC2H5)2(μ-OH)(μ-OMe)](ClO4)4·5H2O (2). At room temperature, reactions of H3L in MeOH with cobalt(II) perchlorate salts led to coassembly of initially formed ligand-bound {CoII2} fragments following aerial oxidation of metal centers and bridging by in situ generated hydroxido/alkoxido groups and added carboxylate anions. Available alkoxido arms of the initially formed {L(μ1,3-O2CCH3)(μ-OH/OMe)Co2}+ fragments were utilized to trap a central CoII ion during the formation of [Co5] aggregates. In the solid state, both complexes have been characterized by X-ray crystallography, variable-temperature magnetic measurements, and theoretical studies. Both 1 and 2 show field-induced slow magnetic relaxation that arises from the single pseudo- T d CoII ion present. The structural distortion leads to an easy-axis magnetic anisotropy ( D = -31.31 cm-1 for 1 and -21.88 cm-1 for 2) and a small but non-negligible transverse component ( E/ D = 0.11 for 1 and 0.08 for 2). The theoretical studies also reveal how the O-Co-O bond angles and the interplanar angles control D and E values in 1 and 2. The presence of two diamagnetic {Co2(μ-L)} hosts controls the distortion of the central {CoO4} unit, highlighting a strategy to control single-ion magnetic anisotropy by trapping single ions within a diamagnetic coordination environment.
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Affiliation(s)
- Krishna Chattopadhyay
- Department of Chemistry , Indian Institute of Technology Kharagpur , Kharagpur 721 302 , India.,School of Chemical Sciences , Indian Association for the Cultivation of Science , Jadavpur, Kolkata 700032 , India
| | - María José Heras Ojea
- WestCHEM, School of Chemistry , University of Glasgow , University Avenue , Glasgow G12 8QQ , U.K
| | - Arup Sarkar
- Department of Chemistry , Indian Institute of Technology Bombay , Mumbai 400 076 , India
| | - Mark Murrie
- WestCHEM, School of Chemistry , University of Glasgow , University Avenue , Glasgow G12 8QQ , U.K
| | - Gopalan Rajaraman
- Department of Chemistry , Indian Institute of Technology Bombay , Mumbai 400 076 , India
| | - Debashis Ray
- Department of Chemistry , Indian Institute of Technology Kharagpur , Kharagpur 721 302 , India
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69
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Zhai YQ, Deng YF, Zheng YZ. Pseudotetrahedral cobalt(ii) complexes with PNP-ligands showing uniaxial magnetic anisotropy. Dalton Trans 2018; 47:8874-8878. [PMID: 29922787 DOI: 10.1039/c8dt01683f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Two mononuclear pseudotetrahedral cobalt(ii) complexes with the formula Co(PNP)X2, where X = Cl (1) or X = SCN (2) and PNP = bis(2-(diphenylphosphaneyl)-4-methylphenyl)amine, have been synthesised. Magnetic and high-frequency/field electron paramagnetic resonance (HF-EPR) spectroscopy and ab initio calculation studies reveal that both complexes show uniaxial magnetic anisotropy.
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Affiliation(s)
- Yuan-Qi Zhai
- Frontier Institute of Science and Technology (FIST), State Key Laboratory for Mechanical Behavior of Materials, MOE Key Laboratory for Nonequilibrium Synthesis of Condensed Matter, Xi'an Key Laboratory of Sustainable Energy and Materials Chemistry and School of Science, Xi'an Jiaotong University, 99 Yanxiang Road, Xi'an, Shaanxi 710054, P. R. China.
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70
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Craven M, Nygaard MH, Zadrozny JM, Long JR, Overgaard J. Determination of d-Orbital Populations in a Cobalt(II) Single-Molecule Magnet Using Single-Crystal X-ray Diffraction. Inorg Chem 2018; 57:6913-6920. [PMID: 29862809 DOI: 10.1021/acs.inorgchem.8b00513] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The tetrahedral cobalt(II) compound (Ph4P)2[Co(SPh)4] was the first mononuclear transition-metal complex shown to exhibit slow relaxation of the magnetization in zero external magnetic field. Because the relative populations of the d orbitals play a vital role in dictating the magnitude of the magnetic anisotropy, the magnetic behavior of this complex is directly related to its electronic structure, yet the exact role of the soft, thiophenolate ligands in influencing the d-electron configuration has previously only been investigated via theoretical methods. To provide detailed experimental insight into the effect of this ligand field, the electron density distribution in this compound was determined from low-temperature, single-crystal X-ray diffraction data and subsequent multipole modeling. Topological analysis of the electron density indicates significant covalent contributions to the cobalt-sulfur bonds. The derived d-orbital populations further reveal a fully occupied d z2 orbital, minor d xz orbital population, and nearly equal population of the d xy, d x2- y2, and d yz orbitals. Notably, we find that an electrostatic interaction between Co(II) and one hydrogen atom from a thiophenolate group in the xz plane increases the energy of the d x2- y2 orbital, leading to the nearly equal population with d xy and strong magnetic anisotropy.
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Affiliation(s)
- Matthew Craven
- Department of Chemistry , Aarhus University , Langelandsgade 140 , DK-8000 Aarhus C , Denmark
| | - Mathilde H Nygaard
- Department of Chemistry , Aarhus University , Langelandsgade 140 , DK-8000 Aarhus C , Denmark
| | | | - Jeffrey R Long
- Materials Sciences Division , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States
| | - Jacob Overgaard
- Department of Chemistry , Aarhus University , Langelandsgade 140 , DK-8000 Aarhus C , Denmark
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71
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Switlicka A, Machura B, Kruszynski R, Cano J, Toma LM, Lloret F, Julve M. The influence of pseudohalide ligands on the SIM behaviour of four-coordinate benzylimidazole-containing cobalt(ii) complexes. Dalton Trans 2018; 47:5831-5842. [PMID: 29648565 DOI: 10.1039/c7dt04735e] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Three, mononuclear complexes of the formula [Co(bmim)2(SCN)2] (1), [Co(bmim)2(NCO)2] (2) and [Co(bmim)2(N3)2] (3) [bmim = 1-benzyl-2-methylimidazole] were prepared and structurally analyzed by single-crystal X-ray crystallography. The cobalt(ii) ions in 1-3 are tetrahedrally coordinated with two bmim molecules and two pseudohalide anions. The angular distortion parameter δ was calculated and the SHAPE program (based on the CShM concept) was used for 1-3 to estimate the angular distortion from an ideal tetrahedron. The molecules of 1-3 are effectively separated, and the values of the shortest distance of cobalt-cobalt are 8.442(6) and 6.774(8) Å for 1, 10.349(8) and 10.716(8) Å for 2 and 6.778(1) and 9.232(1) Å for 3. Direct current (dc) magnetic susceptibility measurements on the crushed crystals of 1-3 were carried out in the temperature range 1.9-295 K. The variable-temperature magnetic data of 1-3 mainly obey the zero-field splitting effect (D) of the 4A2 ground term of the tetrahedral cobalt(ii) complexes (2D being the energy gap between the |±1/2 and |±3/2 levels of the spin). The analysis of their magnetic data through the Hamiltonian H = D[S2z - S(S + 1)/3] + E(Sx2 - Sy2) + gβHS led to the following best-fit parameters: g = 2.29, D = -7.5 cm-1 and E/D = 0.106 (1), g = 2.28, D = + 6.3 cm-1 and E/D = 0.007 (2) and g = 2.36, D = + 6.7 cm-1 and E/D = 0.090 (3). The signs of D for 1-3 were confirmed by Q-band EPR spectra on powdered samples in the temperature range 4.0-20 K. Field-induced SIM behaviour was observed for 1-3 below 4.0 K, and the frequency-dependent maxima of χ''M were observed for 1 and only incipient signals of χ''M occurred for 2 and 3. The values of the exponential factor (τ0) and activation energy (Ea) for 1-3 which were obtained from the Arrhenius plot suggest a single relaxation process characteristic of an Orbach mechanism.
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Affiliation(s)
- A Switlicka
- Department of Crystallography, Institute of Chemistry, University of Silesia, 9th Szkolna St., 40-006 Katowice, Poland.
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72
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Vaidya S, Shukla P, Tripathi S, Rivière E, Mallah T, Rajaraman G, Shanmugam M. Substituted versus Naked Thiourea Ligand Containing Pseudotetrahedral Cobalt(II) Complexes: A Comparative Study on Its Magnetization Relaxation Dynamics Phenomenon. Inorg Chem 2018; 57:3371-3386. [DOI: 10.1021/acs.inorgchem.8b00160] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Shefali Vaidya
- Department of Chemistry, Indian Institute of Technology (IIT) Bombay, Powai, Mumbai, 400076 Maharashtra, India
| | - Pragya Shukla
- Department of Chemistry, Indian Institute of Technology (IIT) Bombay, Powai, Mumbai, 400076 Maharashtra, India
| | - Shalini Tripathi
- Department of Chemistry, Indian Institute of Technology (IIT) Bombay, Powai, Mumbai, 400076 Maharashtra, India
| | - Eric Rivière
- Institut de Chimie Moléculaire et des Matériaux d’Orsay, CNRS, Université Paris Sud and Université Paris Saclay, Orsay, Cedex 91405, France
| | - Talal Mallah
- Institut de Chimie Moléculaire et des Matériaux d’Orsay, CNRS, Université Paris Sud and Université Paris Saclay, Orsay, Cedex 91405, France
| | - Gopalan Rajaraman
- Department of Chemistry, Indian Institute of Technology (IIT) Bombay, Powai, Mumbai, 400076 Maharashtra, India
| | - Maheswaran Shanmugam
- Department of Chemistry, Indian Institute of Technology (IIT) Bombay, Powai, Mumbai, 400076 Maharashtra, India
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73
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Gupta T, Rajaraman G. Modelling spin Hamiltonian parameters of molecular nanomagnets. Chem Commun (Camb) 2018; 52:8972-9008. [PMID: 27366794 DOI: 10.1039/c6cc01251e] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Molecular nanomagnets encompass a wide range of coordination complexes possessing several potential applications. A formidable challenge in realizing these potential applications lies in controlling the magnetic properties of these clusters. Microscopic spin Hamiltonian (SH) parameters describe the magnetic properties of these clusters, and viable ways to control these SH parameters are highly desirable. Computational tools play a proactive role in this area, where SH parameters such as isotropic exchange interaction (J), anisotropic exchange interaction (Jx, Jy, Jz), double exchange interaction (B), zero-field splitting parameters (D, E) and g-tensors can be computed reliably using X-ray structures. In this feature article, we have attempted to provide a holistic view of the modelling of these SH parameters of molecular magnets. The determination of J includes various class of molecules, from di- and polynuclear Mn complexes to the {3d-Gd}, {Gd-Gd} and {Gd-2p} class of complexes. The estimation of anisotropic exchange coupling includes the exchange between an isotropic metal ion and an orbitally degenerate 3d/4d/5d metal ion. The double-exchange section contains some illustrative examples of mixed valance systems, and the section on the estimation of zfs parameters covers some mononuclear transition metal complexes possessing very large axial zfs parameters. The section on the computation of g-anisotropy exclusively covers studies on mononuclear Dy(III) and Er(III) single-ion magnets. The examples depicted in this article clearly illustrate that computational tools not only aid in interpreting and rationalizing the observed magnetic properties but possess the potential to predict new generation MNMs.
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Affiliation(s)
- Tulika Gupta
- Department of Chemistry, IIT Powai, Mumbai-400076, India.
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74
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Wang ZX, Wu LF, Zhang X, Xing F, Li MX. Structural diversity and magnetic properties of six cobalt coordination polymers based on 2,2'-phosphinico-dibenzoate ligand. Dalton Trans 2018; 45:19500-19510. [PMID: 27896355 DOI: 10.1039/c6dt04010a] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Six novel Co(ii) coordination polymers, namely, [Co10L6(OH)2(H2O)9]·10.5H2O (1), [Co3L2(3-abpt)2]·4H2O (2), [Co3L2(4-azpy)2(H2O)2(EtOH)] (3), [Co3L2(4,4'-bipy)2(H2O)2(MeCN)] (4), [Co3L2(4,4'-bipy)2] (5), and [Co5L2(OH)2(ina)2(H2O)2] (6) (H3L = 2,2'-phosphinico-dibenzoic acid, 3-abpt = 4-amino-3,5-bis(3-pyridyl)-1,2,4-triazole, 4-azpy = 4,4'-azobispyridine, 4,4'-bipy = 4,4'-bipyridine, Hina = isonicotinic acid), have been hydrothermally synthesized and their magnetic properties have been characterized. The L3- anion displays six types of coordination modes in the compounds. Compound 1 exhibits a novel 1D ladder-like structure, which consists of non-centrosymmetric Co10 units. Compounds 2-4 comprise 2D networks assembled from Co3L2 chains and N-heterocyclic linkers. Compound 5 comprises a 3D framework built from six neighboring parallel Co3L2 ladders bridged by 4,4'-bipy linkers. Compound 6 features a 3D framework that exhibits pcu topology with the Schläfli symbol of (412·63) using a pentanuclear [Co5(OH)2]8+ cluster as the node. Variable-temperature magnetic susceptibility studies indicate that the six coordination polymers exhibit remarkable magnetic behavior such as spin-canted antiferromagnetism and spin glass, which were found to coexist in compound 6.
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Affiliation(s)
- Zhao-Xi Wang
- Department of Chemistry, Center for Supramolecular Chemistry and Catalysis, Innovative Drug Research Center, Shanghai University, Shanghai 200444, People's Republic of China. and State Key Laboratory of Coordination Chemistry, Nanjing University, Nanjing 210093, People's Republic of China
| | - Lin-Fei Wu
- Department of Chemistry, Center for Supramolecular Chemistry and Catalysis, Innovative Drug Research Center, Shanghai University, Shanghai 200444, People's Republic of China.
| | - Xuan Zhang
- Department of Chemistry, Texas A&M University, P.O. Box 30012, College Station, TX 77842-3012, USA
| | - Feifei Xing
- Department of Chemistry, Center for Supramolecular Chemistry and Catalysis, Innovative Drug Research Center, Shanghai University, Shanghai 200444, People's Republic of China.
| | - Ming-Xing Li
- Department of Chemistry, Center for Supramolecular Chemistry and Catalysis, Innovative Drug Research Center, Shanghai University, Shanghai 200444, People's Republic of China.
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75
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76
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Mondal AK, Sundararajan M, Konar S. A new series of tetrahedral Co(ii) complexes [CoLX2] (X = NCS, Cl, Br, I) manifesting single-ion magnet features. Dalton Trans 2018; 47:3745-3754. [DOI: 10.1039/c7dt04007e] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The influence of ligand field strength on the magnetic anisotropy of a series of isostructural tetrahedral CoII complexes has been investigated by using a combined experimental and theoretical approach.
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Affiliation(s)
- Amit Kumar Mondal
- Department of Chemistry
- Indian Institute of Science Education and Research Bhopal
- Bhauri
- India
| | - Mahesh Sundararajan
- Theoretical Chemistry Section
- Bhabha Atomic Research Centre
- Mumbai 400085
- India
| | - Sanjit Konar
- Department of Chemistry
- Indian Institute of Science Education and Research Bhopal
- Bhauri
- India
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77
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Pathak S, Lang L, Neese F. A dynamic correlation dressed complete active space method: Theory, implementation, and preliminary applications. J Chem Phys 2017; 147:234109. [DOI: 10.1063/1.5017942] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Affiliation(s)
- Shubhrodeep Pathak
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstr. 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Lucas Lang
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstr. 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Frank Neese
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstr. 34-36, D-45470 Mülheim an der Ruhr, Germany
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78
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Deeth RJ, Halcrow MA, Kershaw Cook LJ, Raithby PR. Ab Initio Ligand Field Molecular Mechanics and the Nature of Metal-Ligand π-Bonding in Fe(II) 2,6-di(pyrazol-1-yl)pyridine Spin Crossover Complexes. Chemistry 2017; 24:5204-5212. [DOI: 10.1002/chem.201704558] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Robert J. Deeth
- Department of Chemistry; University of Warwick; Coventry CV4 7AL UK
- Department of Chemistry; University of Bath; Claverton Down Bath BA2 7AY UK
| | | | | | - Paul R. Raithby
- Department of Chemistry; University of Bath; Claverton Down Bath BA2 7AY UK
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79
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Chilkuri VG, DeBeer S, Neese F. Revisiting the Electronic Structure of FeS Monomers Using ab Initio Ligand Field Theory and the Angular Overlap Model. Inorg Chem 2017; 56:10418-10436. [DOI: 10.1021/acs.inorgchem.7b01371] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Vijay Gopal Chilkuri
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D45470 Mülheim an der Ruhr, Germany
| | - Serena DeBeer
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D45470 Mülheim an der Ruhr, Germany
| | - Frank Neese
- Max Planck Institute for Chemical Energy Conversion, Stiftstrasse 34-36, D45470 Mülheim an der Ruhr, Germany
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80
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Singh SK, Eng J, Atanasov M, Neese F. Covalency and chemical bonding in transition metal complexes: An ab initio based ligand field perspective. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.03.018] [Citation(s) in RCA: 129] [Impact Index Per Article: 18.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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81
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Vaidya S, Singh SK, Shukla P, Ansari K, Rajaraman G, Shanmugam M. Role of Halide Ions in the Nature of the Magnetic Anisotropy in Tetrahedral Co
II
Complexes. Chemistry 2017; 23:9546-9559. [DOI: 10.1002/chem.201606031] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2016] [Indexed: 11/11/2022]
Affiliation(s)
- Shefali Vaidya
- Department of ChemistryIndian Institute of Technology Bombay, Powai Mumbai- 400076, Maharashtra India
| | - Saurabh Kumar Singh
- Department of ChemistryIndian Institute of Technology Bombay, Powai Mumbai- 400076, Maharashtra India
- Department of Molecular Theory and SpectroscopyMax-Planck Institute for Chemical Energy Conversion Mülheim an der Ruhr 45470 Germany
| | - Pragya Shukla
- Department of ChemistryIndian Institute of Technology Bombay, Powai Mumbai- 400076, Maharashtra India
| | - Kamaluddin Ansari
- Department of ChemistryIndian Institute of Technology Bombay, Powai Mumbai- 400076, Maharashtra India
| | - Gopalan Rajaraman
- Department of ChemistryIndian Institute of Technology Bombay, Powai Mumbai- 400076, Maharashtra India
| | - Maheswaran Shanmugam
- Department of ChemistryIndian Institute of Technology Bombay, Powai Mumbai- 400076, Maharashtra India
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82
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Coste SC, Vlaisavljevich B, Freedman DE. Magnetic Anisotropy from Main-Group Elements: Halides versus Group 14 Elements. Inorg Chem 2017; 56:8195-8202. [DOI: 10.1021/acs.inorgchem.7b00923] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Scott C. Coste
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Bess Vlaisavljevich
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Danna E. Freedman
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
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83
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Krupička M, Sivalingam K, Huntington L, Auer AA, Neese F. A toolchain for the automatic generation of computer codes for correlated wavefunction calculations. J Comput Chem 2017; 38:1853-1868. [DOI: 10.1002/jcc.24833] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Revised: 03/24/2017] [Accepted: 03/27/2017] [Indexed: 01/30/2023]
Affiliation(s)
- Martin Krupička
- Max-Planck-Institut für Chemische Energiekonversion, Department of Molecular Theory and Spectroscopy; Stiftstr. 34-36 Mülheim a.d. Ruhr 45470 Germany
| | - Kantharuban Sivalingam
- Max-Planck-Institut für Chemische Energiekonversion, Department of Molecular Theory and Spectroscopy; Stiftstr. 34-36 Mülheim a.d. Ruhr 45470 Germany
| | - Lee Huntington
- Max-Planck-Institut für Chemische Energiekonversion, Department of Molecular Theory and Spectroscopy; Stiftstr. 34-36 Mülheim a.d. Ruhr 45470 Germany
| | - Alexander A. Auer
- Max-Planck-Institut für Chemische Energiekonversion, Department of Molecular Theory and Spectroscopy; Stiftstr. 34-36 Mülheim a.d. Ruhr 45470 Germany
| | - Frank Neese
- Max-Planck-Institut für Chemische Energiekonversion, Department of Molecular Theory and Spectroscopy; Stiftstr. 34-36 Mülheim a.d. Ruhr 45470 Germany
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84
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Molecular magnetism, quo vadis? A historical perspective from a coordination chemist viewpoint☆. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.03.004] [Citation(s) in RCA: 240] [Impact Index Per Article: 34.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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85
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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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86
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Suturina EA, Nehrkorn J, Zadrozny JM, Liu J, Atanasov M, Weyhermüller T, Maganas D, Hill S, Schnegg A, Bill E, Long JR, Neese F. Magneto-Structural Correlations in Pseudotetrahedral Forms of the [Co(SPh)4]2– Complex Probed by Magnetometry, MCD Spectroscopy, Advanced EPR Techniques, and ab Initio Electronic Structure Calculations. Inorg Chem 2017; 56:3102-3118. [DOI: 10.1021/acs.inorgchem.7b00097] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Elizaveta A. Suturina
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, Mülheim an der Ruhr 45470, Germany
- Novosibirsk State University, Pirogova 2, 630090 Novosibirsk, Russia
| | - Joscha Nehrkorn
- Berlin Joint EPR Lab, Institute for Nanospectroscopy, Helmholtz-Zentrum Berlin für Materialien und Energie, Kekuléstraße
5, 12489 Berlin, Germany
| | - Joseph M. Zadrozny
- Department of Chemistry, University of California Berkeley, Berkeley, California 94720, United States
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States
| | - Junjie Liu
- National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
- Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1
3PU, United Kingdom
| | - Mihail Atanasov
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, Mülheim an der Ruhr 45470, Germany
- Bulgarian Academy of Sciences, Institute of General and Inorganic
Chemistry, Akad. Georgi
Bontchev Street 11, 1113 Sofia, Bulgaria
| | - Thomas Weyhermüller
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, Mülheim an der Ruhr 45470, Germany
| | - Dimitrios Maganas
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, Mülheim an der Ruhr 45470, Germany
| | - Stephen Hill
- National High Magnetic Field Laboratory, Tallahassee, Florida 32310, United States
- Department of Physics, Florida State University, Tallahassee, Florida 32306, United States
| | - Alexander Schnegg
- Berlin Joint EPR Lab, Institute for Nanospectroscopy, Helmholtz-Zentrum Berlin für Materialien und Energie, Kekuléstraße
5, 12489 Berlin, Germany
| | - Eckhard Bill
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, Mülheim an der Ruhr 45470, Germany
| | - Jeffrey R. Long
- Department of Chemistry, University of California Berkeley, Berkeley, California 94720, United States
| | - Frank Neese
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, Mülheim an der Ruhr 45470, Germany
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87
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Benda L, Mareš J, Ravera E, Parigi G, Luchinat C, Kaupp M, Vaara J. Pseudo-Contact NMR Shifts over the Paramagnetic Metalloprotein CoMMP-12 from First Principles. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201608829] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Ladislav Benda
- Institut für Chemie, Theoretische Chemie; Technische Universität Berlin; Sekr. C7, Straße des 17. Juni 135 10623 Berlin Germany
- Institut des Sciences Analytiques; UMR 5280 CNRS/ ENS Lyon/ UCB Lyon 1; 5 rue de la Doua 69100 Villeurbanne France
| | - Jiří Mareš
- NMR Research Unit; University of Oulu; P.O. Box 3000 90014 Oulu Finland
| | - Enrico Ravera
- Magnetic Resonance Center; University of Florence and; Interuniversity Consortium for Magnetic Resonance of Metalloproteins; Sesto Fiorentino Italy
| | - Giacomo Parigi
- Magnetic Resonance Center; University of Florence and; Interuniversity Consortium for Magnetic Resonance of Metalloproteins; Sesto Fiorentino Italy
- Department of Chemistry; University of Florence; Sesto Fiorentino Italy
| | - Claudio Luchinat
- Magnetic Resonance Center; University of Florence and; Interuniversity Consortium for Magnetic Resonance of Metalloproteins; Sesto Fiorentino Italy
- Department of Chemistry; University of Florence; Sesto Fiorentino Italy
| | - Martin Kaupp
- Institut für Chemie, Theoretische Chemie; Technische Universität Berlin; Sekr. C7, Straße des 17. Juni 135 10623 Berlin Germany
| | - Juha Vaara
- NMR Research Unit; University of Oulu; P.O. Box 3000 90014 Oulu Finland
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88
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Werncke CG, Bouammali MA, Baumard J, Suaud N, Martins C, Guihéry N, Vendier L, Zheng J, Sortais JB, Darcel C, Sabo-Etienne S, Sutter JP, Bontemps S, Pichon C. Ising-type Magnetic Anisotropy and Slow Relaxation of the Magnetization in Four-Coordinate Amido-Pyridine FeII Complexes. Inorg Chem 2016; 55:10968-10977. [DOI: 10.1021/acs.inorgchem.6b01512] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- C. Gunnar Werncke
- CNRS, LCC, 205 route
de Narbonne, F-31077 Toulouse, France
- Université de Toulouse, UPS, INPT, LCC, F-31007 Toulouse, France
| | | | - Julie Baumard
- LCPQ, Université de Toulouse III, 118
route de Narbonne, F-31062 Toulouse, France
| | - Nicolas Suaud
- LCPQ, Université de Toulouse III, 118
route de Narbonne, F-31062 Toulouse, France
| | - Cyril Martins
- LCPQ, Université de Toulouse III, 118
route de Narbonne, F-31062 Toulouse, France
| | - Nathalie Guihéry
- LCPQ, Université de Toulouse III, 118
route de Narbonne, F-31062 Toulouse, France
| | - Laure Vendier
- CNRS, LCC, 205 route
de Narbonne, F-31077 Toulouse, France
- Université de Toulouse, UPS, INPT, LCC, F-31007 Toulouse, France
| | - Jianxia Zheng
- Team Organometallics:
Materials and Catalysis, Centre for Catalysis and Green Chemistry,
Campus de Beaulieu, Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS−Université de Rennes 1, 263 av. du Général
Leclerc, F-35042 Rennes Cedex, France
| | - Jean-Baptiste Sortais
- Team Organometallics:
Materials and Catalysis, Centre for Catalysis and Green Chemistry,
Campus de Beaulieu, Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS−Université de Rennes 1, 263 av. du Général
Leclerc, F-35042 Rennes Cedex, France
| | - Christophe Darcel
- Team Organometallics:
Materials and Catalysis, Centre for Catalysis and Green Chemistry,
Campus de Beaulieu, Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS−Université de Rennes 1, 263 av. du Général
Leclerc, F-35042 Rennes Cedex, France
| | - Sylviane Sabo-Etienne
- CNRS, LCC, 205 route
de Narbonne, F-31077 Toulouse, France
- Université de Toulouse, UPS, INPT, LCC, F-31007 Toulouse, France
| | - Jean-Pascal Sutter
- CNRS, LCC, 205 route
de Narbonne, F-31077 Toulouse, France
- Université de Toulouse, UPS, INPT, LCC, F-31007 Toulouse, France
| | - Sébastien Bontemps
- CNRS, LCC, 205 route
de Narbonne, F-31077 Toulouse, France
- Université de Toulouse, UPS, INPT, LCC, F-31007 Toulouse, France
| | - Céline Pichon
- CNRS, LCC, 205 route
de Narbonne, F-31077 Toulouse, France
- Université de Toulouse, UPS, INPT, LCC, F-31007 Toulouse, France
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89
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Benda L, Mareš J, Ravera E, Parigi G, Luchinat C, Kaupp M, Vaara J. Pseudo-Contact NMR Shifts over the Paramagnetic Metalloprotein CoMMP-12 from First Principles. Angew Chem Int Ed Engl 2016; 55:14713-14717. [PMID: 27781358 DOI: 10.1002/anie.201608829] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2016] [Indexed: 11/08/2022]
Abstract
Long-range pseudo-contact NMR shifts (PCSs) provide important restraints for the structure refinement of proteins when a paramagnetic metal center is present, either naturally or introduced artificially. Here we show that ab initio quantum-chemical methods and a modern version of the Kurland-McGarvey approach for paramagnetic NMR (pNMR) shifts in the presence of zero-field splitting (ZFS) together provide accurate predictions of all PCSs in a metalloprotein (high-spin cobalt-substituted MMP-12 as a test case). Computations of 314 13 C PCSs using g- and ZFS tensors based on multi-reference methods provide a reliable bridge between EPR-parameter- and susceptibility-based pNMR formalisms. Due to the high sensitivity of PCSs to even small structural differences, local structures based either on X-ray diffraction or on various DFT optimizations could be evaluated critically by comparing computed and experimental PCSs. Many DFT functionals provide insufficiently accurate structures. We also found the available 1RMZ PDB X-ray structure to exhibit deficiencies related to binding of a hydroxamate inhibitor. This has led to a newly refined PDB structure for MMP-12 (5LAB) that provides a more accurate coordination arrangement and PCSs.
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Affiliation(s)
- Ladislav Benda
- Institut für Chemie, Theoretische Chemie, Technische Universität Berlin, Sekr. C7, Straße des 17. Juni 135, 10623, Berlin, Germany.,Institut des Sciences Analytiques, UMR 5280 CNRS/ ENS Lyon/ UCB Lyon 1, 5 rue de la Doua, 69100, Villeurbanne, France
| | - Jiří Mareš
- NMR Research Unit, University of Oulu, P.O. Box 3000, 90014, Oulu, Finland
| | - Enrico Ravera
- Magnetic Resonance Center, University of Florence and, Interuniversity Consortium for Magnetic Resonance of Metalloproteins, Sesto Fiorentino, Italy
| | - Giacomo Parigi
- Magnetic Resonance Center, University of Florence and, Interuniversity Consortium for Magnetic Resonance of Metalloproteins, Sesto Fiorentino, Italy.,Department of Chemistry, University of Florence, Sesto Fiorentino, Italy
| | - Claudio Luchinat
- Magnetic Resonance Center, University of Florence and, Interuniversity Consortium for Magnetic Resonance of Metalloproteins, Sesto Fiorentino, Italy.,Department of Chemistry, University of Florence, Sesto Fiorentino, Italy
| | - Martin Kaupp
- Institut für Chemie, Theoretische Chemie, Technische Universität Berlin, Sekr. C7, Straße des 17. Juni 135, 10623, Berlin, Germany
| | - Juha Vaara
- NMR Research Unit, University of Oulu, P.O. Box 3000, 90014, Oulu, Finland
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90
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Vaidya S, Tewary S, Singh SK, Langley SK, Murray KS, Lan Y, Wernsdorfer W, Rajaraman G, Shanmugam M. What Controls the Sign and Magnitude of Magnetic Anisotropy in Tetrahedral Cobalt(II) Single-Ion Magnets? Inorg Chem 2016; 55:9564-9578. [DOI: 10.1021/acs.inorgchem.6b01073] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shefali Vaidya
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra India
| | - Subrata Tewary
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra India
| | - Saurabh Kumar Singh
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra India
| | - Stuart K. Langley
- School
of Science and the Environment, Chemistry Division, Manchester Metropolitan University, Manchester M15 6HB, U.K
| | - Keith S. Murray
- School
of Chemistry, Monash University, Clayton 3800, Victoria, Australia
| | - Yanhua Lan
- Institut
Néel, CNRS and Université Grenoble Alpes, BP 166,
25 Avenue des Martyrs, 38042 Grenoble Cedex 9, France
| | - Wolfgang Wernsdorfer
- Institut
Néel, CNRS and Université Grenoble Alpes, BP 166,
25 Avenue des Martyrs, 38042 Grenoble Cedex 9, France
| | - Gopalan Rajaraman
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra India
| | - Maheswaran Shanmugam
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra India
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91
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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: 70] [Impact Index Per Article: 8.8] [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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92
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Solvothermal Synthesis, Structure and Magnetic Properties of a Novel Heterometallic Cluster with 2-Ethoxy-6-methyliminomethyl-phenol. J CLUST SCI 2016. [DOI: 10.1007/s10876-016-1030-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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93
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Fataftah MS, Coste SC, Vlaisavljevich B, Zadrozny JM, Freedman DE. Transformation of the coordination complex [Co(C 3S 5) 2] 2- from a molecular magnet to a potential qubit. Chem Sci 2016; 7:6160-6166. [PMID: 30034755 PMCID: PMC6024178 DOI: 10.1039/c6sc02170k] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2016] [Accepted: 06/09/2016] [Indexed: 12/25/2022] Open
Abstract
We employ ac susceptibility as a probe of small changes of transverse zero-field splitting, revealing that these subtle changes transform [Co(C3S5)2]2– from a molecular magnet to a candidate qubit.
Mononuclear transition metal complexes demonstrate significant potential in the divergent applications of spintronics and quantum information processing. The facile tunability of these complexes enables structure function correlations for a plethora of relevant magnetic quantities. We present a series of pseudotetrahedral [Co(C3S5)2]2– complexes with varying deviations from D2d symmetry to investigate the influence of structural distortions on spin relaxation dynamics and qubit viability, as tuned by the variable transverse magnetic anisotropy, E. To overcome the traditional challenge of measuring E in species where D ≫ E, we employed a different approach of harnessing ac magnetic susceptibility to probe the emergence of quantum tunneling of magnetization as a proxy for E. Across the range of values for E in the series, we observe magnetic hysteresis for the smallest value of E. The hysteresis disappears with increasing E, concomitant with the appearance of an observable, low frequency (L-band) electron paramagnetic resonance (EPR) signal, indicating the potential to controllably shift the molecule's utilization from classical to quantum information processing applications. The development of design principles for molecular magnet information processing requires separate design principles for classical versus quantum regimes. Here we show for the first time how subtle structural changes can switch the utility of a complex between these two types of applications.
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Affiliation(s)
- Majed S Fataftah
- Department of Chemistry , Northwestern University , Evanston , IL 60208 , USA .
| | - Scott C Coste
- Department of Chemistry , Northwestern University , Evanston , IL 60208 , USA .
| | - Bess Vlaisavljevich
- Department of Chemistry , Northwestern University , Evanston , IL 60208 , USA .
| | - Joseph M Zadrozny
- Department of Chemistry , Northwestern University , Evanston , IL 60208 , USA .
| | - Danna E Freedman
- Department of Chemistry , Northwestern University , Evanston , IL 60208 , USA .
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94
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Aravena D, Atanasov M, Neese F. Periodic Trends in Lanthanide Compounds through the Eyes of Multireference ab Initio Theory. Inorg Chem 2016; 55:4457-69. [DOI: 10.1021/acs.inorgchem.6b00244] [Citation(s) in RCA: 71] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Daniel Aravena
- Facultad
de Química y Biología, Universidad de Santiago de Chile, Casilla 40, Correo 33, Santiago, Chile
| | - Mihail Atanasov
- Max Planck Institut für Chemische Energiekonversion, Stifstr 34-36, D-45470 Mülheim an der Ruhr, Germany
- Bulgarian
Academy of Sciences, Institute of General and Inorganic Chemistry, Akad. Georgi Bontchev Street 11, 1113 Sofia, Bulgaria
| | - Frank Neese
- Max Planck Institut für Chemische Energiekonversion, Stifstr 34-36, D-45470 Mülheim an der Ruhr, Germany
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95
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Ziegenbalg S, Hornig D, Görls H, Plass W. Cobalt(II)-Based Single-Ion Magnets with Distorted Pseudotetrahedral [N2O2] Coordination: Experimental and Theoretical Investigations. Inorg Chem 2016; 55:4047-58. [DOI: 10.1021/acs.inorgchem.6b00373] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sven Ziegenbalg
- Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena, Humboldtstrasse 8, 07743 Jena, Germany
| | - David Hornig
- Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena, Humboldtstrasse 8, 07743 Jena, Germany
| | - Helmar Görls
- Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena, Humboldtstrasse 8, 07743 Jena, Germany
| | - Winfried Plass
- Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena, Humboldtstrasse 8, 07743 Jena, Germany
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96
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Christian JH, Brogden DW, Bindra JK, Kinyon JS, van Tol J, Wang J, Berry JF, Dalal NS. Enhancing the Magnetic Anisotropy of Linear Cr(II) Chain Compounds Using Heavy Metal Substitutions. Inorg Chem 2016; 55:6376-83. [PMID: 26881994 DOI: 10.1021/acs.inorgchem.5b02545] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Magnetic properties of the series of three linear, trimetallic chain compounds Cr2Cr(dpa)4Cl2, 1, Mo2Cr(dpa)4Cl2, 2, and W2Cr(dpa)4Cl2, 3 (dpa = 2,2'-dipyridylamido), have been studied using variable-temperature dc and ac magnetometry and high-frequency EPR spectroscopy. All three compounds possess an S = 2 electronic ground state arising from the terminal Cr(2+) ion, which exhibits slow magnetic relaxation under an applied magnetic field, as evidenced by ac magnetic susceptibility and magnetization measurements. The slow relaxation stems from the existence of an easy-axis magnetic anisotropy, which is bolstered by the axial symmetry of the compounds and has been quantified through rigorous high-frequency EPR measurements. The magnitude of D in these compounds increases when heavier ions are substituted into the trimetallic chain; thus D = -1.640, -2.187, and -3.617 cm(-1) for Cr2Cr(dpa)4Cl2, Mo2Cr(dpa)4Cl2, and W2Cr(dpa)4Cl2, respectively. Additionally, the D value measured for W2Cr(dpa)4Cl2 is the largest yet reported for a high-spin Cr(2+) system. While earlier studies have demonstrated that ligands containing heavy atoms can enhance magnetic anisotropy, this is the first report of this phenomenon using heavy metal atoms as "ligands".
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Affiliation(s)
- Jonathan H Christian
- Department of Chemistry and Biochemistry, Florida State University , Tallahassee, Florida 32306, United States
| | - David W Brogden
- Department of Chemistry, University of Wisconsin - Madison , 1101 University Avenue Madison, Wisconsin 53706, United States
| | - Jasleen K Bindra
- Department of Chemistry and Biochemistry, Florida State University , Tallahassee, Florida 32306, United States
| | - Jared S Kinyon
- Department of Chemistry and Biochemistry, Florida State University , Tallahassee, Florida 32306, United States
| | - Johan van Tol
- National High Magnetic Field Laboratory, Florida State University , 1800 East Paul Dirac Drive, Tallahassee, Florida 32306, United States
| | - Jingfang Wang
- Department of Chemistry and Biochemistry, Florida State University , Tallahassee, Florida 32306, United States
| | - John F Berry
- Department of Chemistry, University of Wisconsin - Madison , 1101 University Avenue Madison, Wisconsin 53706, United States
| | - Naresh S Dalal
- Department of Chemistry and Biochemistry, Florida State University , Tallahassee, Florida 32306, United States
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97
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Smolko L, Černák J, Dušek M, Titiš J, Boča R. Tetracoordinate Co(ii) complexes containing bathocuproine and single molecule magnetism. NEW J CHEM 2016. [DOI: 10.1039/c6nj00372a] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Chlorido complex [Co(bcp)Cl2] exhibits a field-induced SMM behaviour, while in the bromide and iodido analogues only weak antiferromagnetic interactions are present.
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Affiliation(s)
- Lukáš Smolko
- Department of Inorganic Chemistry
- Institute of Chemistry
- Faculty of Sciences
- P. J Šafárik University in Košice
- 04154 Košice
| | - Juraj Černák
- Department of Inorganic Chemistry
- Institute of Chemistry
- Faculty of Sciences
- P. J Šafárik University in Košice
- 04154 Košice
| | - Michal Dušek
- Institute of Physics
- Czech Academy of Sciences
- 18221 Prague 8
- Czech Republic
| | - Ján Titiš
- Department of Chemistry
- FPV
- University of SS Cyril and Methodius
- 91701 Trnava
- Slovakia
| | - Roman Boča
- Department of Chemistry
- FPV
- University of SS Cyril and Methodius
- 91701 Trnava
- Slovakia
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98
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Eichhöfer A, Buth G. Polymeric cobalt(ii) thiolato complexes – syntheses, structures and properties of 1∞[Co(SMes)2] and 1∞[Co(SPh)2NH3]. Dalton Trans 2016; 45:17382-17391. [DOI: 10.1039/c6dt03098j] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Structural and magnetic characterization of the first examples of polymeric cobalt chalcogenolato complexes namely 1∞[Co(SMes)2] and 1∞[Co(SPh)2NH3].
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Affiliation(s)
- Andreas Eichhöfer
- Institut für Nanotechnologie
- Karlsruher Institut für Technologie (KIT)
- 76344 Eggenstein-Leopoldshafen
- Germany
- Lehn Institute of Functional Materials
| | - Gernot Buth
- Institut für Photonenforschung und Synchrotronstrahlung
- Karlsruher Institut für Technologie (KIT)
- 76344 Eggenstein-Leopoldshafen
- Germany
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