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Bhatt G, Sharma T, Gupta SK, Meyer F, Rajaraman G, Murugavel R. Tuning Magnetic Anisotropy in Co(II) Tetrahedral Carbazole-Modified Phosphine Oxide Single-Ion Magnets: Importance of Structural Distortion versus Heavy-Ion Effect. Inorg Chem 2023; 62:18915-18925. [PMID: 37947449 DOI: 10.1021/acs.inorgchem.3c02401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2023]
Abstract
Three mononuclear cobalt(II) tetrahedral complexes [Co(CzPh2PO)2X2] (CzPh2PO = (9H-carbazol-9-yl)diphenylphosphine oxide and X = Cl (1), Br (2), I (3)) have been synthesized using a simple synthetic approach to examine their single-ion magnetic (SIM) behavior. A detailed study of the variation in the dynamic magnetic properties of the Co(II) ion in a tetrahedral ligand field has been carried out by the change of the halide ligand. The axial zero-field splitting parameter D was found to vary from -16.4 cm-1 in 1 to -13.8 cm-1 in 2 and +14.6 cm-1 in 3. All the new complexes exhibit field-induced SIM behavior. The results obtained from ab initio CASSF calculations match well with the experimental data, revealing how halide ions induce a change in the D value as we move from Cl- to I-. The ab initio calculations further reveal that the change in the sign of D is due to the multideterminant characteristics of the ground state wave function of 1 and 2, while single-determinant characteristics are instead observed for 3. To gain a better understanding of the relationship between the structural distortion and the sign and magnitude of D values, magnetostructural D correlations were developed using angular relationships, revealing the importance of structural distortions over the heavy halide effect in controlling the sign of D values. This study broadens the scope of employing electronically and sterically modified phosphine oxide ligands in building new types of air-stable Co(II) SIMs.
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Affiliation(s)
- Gargi Bhatt
- Department of Chemistry, Indian Institute of Technology Bombay, Powai 400076, Mumbai, India
| | - Tanu Sharma
- Department of Chemistry, Indian Institute of Technology Bombay, Powai 400076, Mumbai, India
| | - Sandeep K Gupta
- University of Göttingen, Institute of Inorganic Chemistry, Göttingen D-37077, Germany
| | - Franc Meyer
- University of Göttingen, Institute of Inorganic Chemistry, Göttingen D-37077, Germany
| | - Gopalan Rajaraman
- Department of Chemistry, Indian Institute of Technology Bombay, Powai 400076, Mumbai, India
| | - Ramaswamy Murugavel
- Department of Chemistry, Indian Institute of Technology Bombay, Powai 400076, Mumbai, India
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2
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Devkota L, SantaLucia DJ, Wheaton AM, Pienkos AJ, Lindeman SV, Krzystek J, Ozerov M, Berry JF, Telser J, Fiedler AT. Spectroscopic and Magnetic Studies of Co(II) Scorpionate Complexes: Is There a Halide Effect on Magnetic Anisotropy? Inorg Chem 2023; 62:5984-6002. [PMID: 37000941 DOI: 10.1021/acs.inorgchem.2c04468] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
Abstract
The observation of single-molecule magnetism in transition-metal complexes relies on the phenomenon of zero-field splitting (ZFS), which arises from the interplay of spin-orbit coupling (SOC) with ligand-field-induced symmetry lowering. Previous studies have demonstrated that the magnitude of ZFS in complexes with 3d metal ions is sometimes enhanced through coordination with heavy halide ligands (Br and I) that possess large free-atom SOC constants. In this study, we systematically probe this "heavy-atom effect" in high-spin cobalt(II)-halide complexes supported by substituted hydrotris(pyrazol-1-yl)borate ligands (TptBu,Me and TpPh,Me). Two series of complexes were prepared: [CoIIX(TptBu,Me)] (1-X; X = F, Cl, Br, and I) and [CoIIX(TpPh,Me)(HpzPh,Me)] (2-X; X = Cl, Br, and I), where HpzPh,Me is a monodentate pyrazole ligand. Examination with dc magnetometry, high-frequency and -field electron paramagnetic resonance, and far-infrared magnetic spectroscopy yielded axial (D) and rhombic (E) ZFS parameters for each complex. With the exception of 1-F, complexes in the four-coordinate 1-X series exhibit positive D-values between 10 and 13 cm-1, with no dependence on halide size. The five-coordinate 2-X series exhibit large and negative D-values between -60 and -90 cm-1. Interpretation of the magnetic parameters with the aid of ligand-field theory and ab initio calculations elucidated the roles of molecular geometry, ligand-field effects, and metal-ligand covalency in controlling the magnitude of ZFS in cobalt-halide complexes.
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Taylor WV, Cashman BK, Xie ZL, Ngo KK, Rose MJ. Synthesis and Magnetic Properties of Antimony-Ligated Co(II) Complexes: Stibines versus Phosphines. Inorg Chem 2022; 61:6733-6741. [PMID: 35466675 DOI: 10.1021/acs.inorgchem.1c03366] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Herein, we test the hypothesis that neutral, heavy-atom stibine donors can increase the extent of spin-orbit coupling on light, 3d transition metal. To this end, we developed a novel synthetic route toward coordinating a paramagnetic 3d metal ion─cobalt(II)─with neutral stibine ligands. Such complexes have not been reported in the literature due to the weak σ donor strength of stibines and the hard-soft mismatch between a 3d metal and a 5p ligand─which herein has been overcome using alkylated Sb donors. Magnetometry of [(SbiPr2Ph)2Co(I)2] (1) reveals that the stibine complex 1 exhibits a higher magnitude D value (D = |24.96| cm-1) than the spectroscopically derived value for the corresponding phosphine complex 3 (D = -13.13 cm-1), indicative of large zero-field splitting. CASSCF/NEVPT2 calculations corroborate the experimental D values for 1 and 3, predicting D = -31.9 and -8.9 cm-1, respectively. A re-examination of magnetic parameters across the entire series [(ER3)2Co(X)2] (E = P → Sb; X = Cl → I) reveals that (i) increasingly heavy pnictogens lead to an increased X-Co-X bond angle, which is correlated with larger magnitude D values, and (ii) for a given X-Co-X bond angle, the D value is always higher in the presence of a heavy pnictogen as compared with a heavy halide. Ab initio ligand field theory calculations for 1 (stibine complex) and 3 (phosphine complex) reveal no substantial differences in spin-orbit coupling (ζ = 479.2, 480.2 cm-1) or Racah parameter (B = 947.5, 943.9 cm-1), an indicator of covalency. Thus, some "heavy atom effect" on the D value beyond geometric perturbation is operative, but its precise mechanism(s) of action remains obscure.
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Affiliation(s)
- William V Taylor
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78757, United States
| | - Brenna K Cashman
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78757, United States
| | - Zhu-Lin Xie
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78757, United States
| | - Karen K Ngo
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78757, United States
| | - Michael J Rose
- Department of Chemistry, The University of Texas at Austin, Austin, Texas 78757, United States
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Zolnhofer EM, Opalade AA, Jackson TA, Heinemann FW, Meyer K, Krzystek J, Ozarowski A, Telser J. Electronic Structure and Magnetic Properties of a Low-Spin Cr II Complex: trans-[CrCl 2(dmpe) 2] (dmpe = 1,2-Bis(dimethylphosphino)ethane). Inorg Chem 2021; 60:17865-17877. [PMID: 34719919 DOI: 10.1021/acs.inorgchem.1c02471] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Octahedral coordination complexes of the general formula trans-[MX2(R2ECH2CH2ER2)2] (MII = Ti, V, Cr, Mn; E = N, P; R = alkyl, aryl) are a cornerstone of both coordination and organometallic chemistry, and many of these complexes are known to have unique electronic structures that have been incompletely examined. The trans-[CrCl2(dmpe)2] complex (dmpe = Me2PCH2CH2PMe2), originally reported by Girolami and co-workers in 1985, is a rare example of a six-coordinate d4 system with an S = 1 (spin triplet) ground state, as opposed to the high-spin (S = 2, spin quintet) state. The ground-state properties of S = 1 systems are challenging to study using conventional spectroscopic methods, and consequently, the electronic structure of trans-[CrCl2(dmpe)2] has remained largely unexplored. In this present work, we have employed high-frequency and -field electron paramagnetic resonance (HFEPR) spectroscopy to characterize the ground-state electronic structure of trans-[CrCl2(dmpe)2]. This analysis yielded a complete set of spin Hamiltonian parameters for this S = 1 complex: D = +7.39(1) cm-1, E = +0.093(1) (E/D = 0.012), and g = [1.999(5), 2.00(1), 2.00(1)]. To develop a detailed electronic structure description for trans-[CrCl2(dmpe)2], we employed both classical ligand-field theory and quantum chemical theory (QCT) calculations, which considered all quintet, triplet, and singlet ligand-field states. While the high density of states suggests an unexpectedly complex electronic structure for this "simple" coordination complex, both the ligand-field and QCT methods were able to reproduce the experimental spin Hamiltonian parameters quite nicely. The QCT computations were also used as a basis for assigning the electronic absorption spectrum of trans-[CrCl2(dmpe)2] in toluene.
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Affiliation(s)
- Eva M Zolnhofer
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander University Erlangen-Nürnberg (FAU), 91058 Erlangen, Germany
| | - Adedamola A Opalade
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - Timothy A Jackson
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - Frank W Heinemann
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander University Erlangen-Nürnberg (FAU), 91058 Erlangen, Germany
| | - Karsten Meyer
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander University Erlangen-Nürnberg (FAU), 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
| | - Joshua Telser
- Department of Biological, Physical and Health Sciences, Roosevelt University, Chicago, Illinois 60605, United States
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Legendre CM, Herbst-Irmer R, Stalke D. Enhancing Steric Hindrance via Ligand Design in Dysprosium Complexes: From Induced Slow Relaxation to Zero-Field Single-Molecule Magnet Properties. Inorg Chem 2021; 60:13982-13989. [PMID: 34450008 DOI: 10.1021/acs.inorgchem.1c00973] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The synthesis and magnetic characterization of three novel Dy compounds, [Dy{PPh2S(NtBu)2}2(μ-Cl2)Li(THF)2] (1), [Dy{PhS(NtBu)2}2(μ-Cl2)Li(THF)2] (2), and [Dy{MeS(NtBu)3}2(μ-Cl2)Li(THF)2] (3), based on the sulfur-nitrogen ligands RS(NtBu)x- (where R = PPh2, x = 2 for (1); R = Ph, x = 2 for (2); and R = Me, x = 3 for (3)) are reported. They represent rare examples of lanthanide-based complexes containing sulfur-nitrogen ligands, whose suitability to enhance the magnetic anisotropy in 3d metals was only recently established. Changes in the ligand field environment drastically affect the magnetic properties, with compounds 1 and 2 displaying field-induced single-molecule magnet (SMM) behavior, while compound 3 shows slow relaxation at zero field. These trends strongly suggest that ligand engineering strategies toward linear dysprosium complexes, similar to those for dysprosocenium complexes, should enhance the SMM performances of SN-based lanthanide compounds.
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Affiliation(s)
- Christina M Legendre
- Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstraße 4, 37077 Göttingen, Germany
| | - Regine Herbst-Irmer
- Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstraße 4, 37077 Göttingen, Germany
| | - Dietmar Stalke
- Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstraße 4, 37077 Göttingen, Germany
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Jung J, Benner F, Herbst‐Irmer R, Demir S, Stalke D. Slow Magnetic Relaxation in Mono- and Bimetallic Lanthanide Tetraimido-Sulfate S(NtBu) 4 2- Complexes. Chemistry 2021; 27:12310-12319. [PMID: 33978251 PMCID: PMC8453918 DOI: 10.1002/chem.202101076] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2021] [Indexed: 12/16/2022]
Abstract
Lanthanide ions are particularly well-suited for the design of single-molecule magnets owing to their large unquenched orbital angular momentum and strong spin-orbit coupling that gives rise to high magnetic anisotropy. Such nanoscopic bar magnets can potentially revolutionize high-density information storage and processing technologies, if blocking temperatures can be increased substantially. Exploring non-classical ligand scaffolds with the aim to boost the barriers to spin-relaxation are prerequisite. Here, the synthesis, crystallographic and magnetic characterization of a series of each isomorphous mono- and dinuclear lanthanide (Ln=Gd, Tb, Dy, Ho, Er) complexes comprising tetraimido sulfate ligands are presented. The dinuclear Dy complex [{(thf)2 Li(NtBu)2 S(tBuN)2 DyCl2 }2 ⋅ ClLi(thf)2 ] (1c) shows true signatures of single-molecule magnet behavior in the absence of a dc field. In addition, the mononuclear Dy and Tb complexes [{(thf)2 Li(NtBu)2 S(tBuN)2 LnCl2 (thf)2 ] (2b,c) show slow magnetic relaxation under applied dc fields.
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Affiliation(s)
- Jochen Jung
- Institut für Anorganische ChemieGeorg-August Universität GöttingenTammannstraße 437077GöttingenGermany
| | - Florian Benner
- Department of ChemistryMichigan State University578 S Shaw LaneEast LansingMI 48824USA
| | - Regine Herbst‐Irmer
- Institut für Anorganische ChemieGeorg-August Universität GöttingenTammannstraße 437077GöttingenGermany
| | - Selvan Demir
- Department of ChemistryMichigan State University578 S Shaw LaneEast LansingMI 48824USA
| | - Dietmar Stalke
- Institut für Anorganische ChemieGeorg-August Universität GöttingenTammannstraße 437077GöttingenGermany
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7
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Bhowmick I, Newell BS, Shores MP. A systematic study of the influence of ligand field on the slow magnetic dynamics of Co(ii)-diimine compounds. Dalton Trans 2021; 50:10737-10748. [PMID: 34269774 DOI: 10.1039/d0dt01597k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein we report heteroleptic Co(ii) diimine complexes [Co(H2bip)2Cl2] (1), [Co(H2bip)2Br2] (2), [Co(H2bip)3]Br2·1MeOH (3) and [Co(H2bip)2(Me2bpy)]Br2·(MeCN)0.5·(H2O)0.25 (4) (H2bip = 2,2'-bi-1,4,5,6-tetrahydropyrimidine, bpy = 2,2'-dipyridyl, Me2bpy = 4,4'-Me-2,2'-dipyridyl), purposefully prepared to enable a systematic study of magnetic property changes arising from the increase of overall ligand field from σ/π-donor chlorido (1) to π-acceptor 4,4'Me-2,2'bpy (4). The presence of axial and rhombic anisotropy (D and E) of these compounds is sufficient to allow 1-4 to show field-induced slow relaxation of magnetization. Interestingly, we found as the effective ligand field is increased in the series, rhombicity (E/D) decreases, and the magnetic relaxation profile changes significantly, where relaxation of magnetization at a specific temperature becomes gradually faster. We performed mechanistic analyses of the temperature dependence of magnetic relaxation times considering Orbach relaxation processes, Raman-like relaxation and quantum tunnelling of magnetization (QTM). The effective energy barrier of the Orbach relaxation process (Ueff) is largest in compound 1 (19.2 cm-1) and gradually decreases in the order 1 > 2 > 3 > 4 giving a minimum value in compound 4 (8.3 cm-1), where the Raman-like mechanism showed the possibility of different types of phonon activity below and above ∼2.5 K. As a precursor of 1, the tetrahedral complex [Co(H2bip)Cl2] (1a) was also synthesized and structurally and magnetically characterized: this compound exhibits slow relaxation of magnetization under an applied dc field (1800 Oe) with a record slow relaxation time of 3.39 s at 1.8 K.
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Affiliation(s)
- Indrani Bhowmick
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523-1872, USA.
| | - Brian S Newell
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523-1872, USA. and Analytical Resources Core, Center for Materials and Molecular Analysis, Colorado State University, Fort Collins, Colorado 80523, USA
| | - Matthew P Shores
- Department of Chemistry, Colorado State University, Fort Collins, CO 80523-1872, USA.
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Stoian SA, Moshari M, Ferentinos E, Grigoropoulos A, Krzystek J, Telser J, Kyritsis P. Electronic Structure of Tetrahedral, S = 2, [Fe{(EP iPr 2) 2N} 2], E = S, Se, Complexes: Investigation by High-Frequency and -Field Electron Paramagnetic Resonance, 57Fe Mössbauer Spectroscopy, and Quantum Chemical Studies. Inorg Chem 2021; 60:10990-11005. [PMID: 34288665 DOI: 10.1021/acs.inorgchem.1c00670] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this work, we assessed the electronic structures of two pseudotetrahedral complexes of FeII, [Fe{(SPiPr2)2N}2] (1) and [Fe{(SePiPr2)2N}2] (2), using high-frequency and -field EPR (HFEPR) and field-dependent 57Fe Mössbauer spectroscopies. This investigation revealed S = 2 ground states characterized by moderate, negative zero-field splitting (zfs) parameters D. The crystal-field (CF) theory analysis of the spin Hamiltonian (sH) and hyperfine structure parameters revealed that the orbital ground states of 1 and 2 have a predominant dx2-y2 character, which is admixed with dz2 (∼10%). Although replacing the S-containing ligands of 1 by their Se-containing analogues in 2 leads to a smaller |D| value, our theoretical analysis, which relied on extensive ab initio CASSCF calculations, suggests that the ligand spin-orbit coupling (SOC) plays a marginal role in determining the magnetic anisotropy of these compounds. Instead, the dx2-y2β → dxyβ excitations yield a large negative contribution, which dominates the zfs of both 1 and 2, while the different energies of the dx2-y2β → dxzβ transitions are the predominant factor responsible for the difference in zfs between 1 and 2. The electronic structures of these compounds are contrasted with those of other [FeS4] sites, including reduced rubredoxin by considering a D2-type distortion of the [Fe(E-X)4] cores, where E = S, Se; X = C, P. Our combined CASSCF/DFT calculations indicate that while the character of the orbital ground state and the quintet excited states' contribution to the zfs of 1 and 2 are modulated by the magnitude of the D2 distortion, this structural change does not impact the contribution of the excited triplet states.
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Affiliation(s)
- Sebastian A Stoian
- Department of Chemistry, University of Idaho, Moscow, Idaho 83844, United States
| | - Mahsa Moshari
- Department of Chemistry, University of Idaho, Moscow, Idaho 83844, United States
| | - Eleftherios Ferentinos
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, Zografou, 15771 Athens, Greece
| | - Alexios Grigoropoulos
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, Zografou, 15771 Athens, Greece
| | - J Krzystek
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Joshua Telser
- Department of Biological, Physical, and Health Sciences, Roosevelt University, Chicago, Illinois 60605, United States
| | - Panayotis Kyritsis
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, Zografou, 15771 Athens, Greece
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Jung J, Legendre CM, Herbst-Irmer R, Stalke D. Exchange Coupling in Binuclear Manganese and Cobalt Complexes with the Tetraimido Sulfate Anion [S(N tBu) 4] 2. Inorg Chem 2021; 60:967-972. [PMID: 33378190 DOI: 10.1021/acs.inorgchem.0c03085] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The (hetero)bimetallic complexes [Cl2Mn(NtBu)2S(tBuN)2Mn{ClLi(THF)3}2] (1), [(acac)Co(NtBu)2S(tBuN)2Co(acac)] (2), and [(acac)Co(NtBu)2S(tBuN)2Li(THF)2] (3), with THF = tetrahydrofuran and acac = acetylacetonate [H2C(C(O)Me)2], were synthesized and investigated for their magnetic properties. While the two different MnII sites in 1 gave a weak coupling of J = -1.00 cm-1, we could observe an appreciable antiferromagnetic coupling of J = -6.08 cm-1 between the two CoII cations in 2, proving the tetraimido sulfate anion to be a challenging but promising linker to enhance magnetic communication between paramagnetic centers. The heterobimetallic complex 3 seems a versatile platform for magnetically interesting d/d, f/d, or f/f mixed-metal complexes.
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Affiliation(s)
- Jochen Jung
- Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstraße 4, Göttingen 37077, Germany
| | - Christina M Legendre
- Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstraße 4, Göttingen 37077, Germany
| | - Regine Herbst-Irmer
- Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstraße 4, Göttingen 37077, Germany
| | - Dietmar Stalke
- Institut für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstraße 4, Göttingen 37077, Germany
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Mantanona AJ, Tolentino DR, Cay KS, Gembicky M, Jazzar R, Bertrand G, Rinehart JD. Tuning electronic structure through halide modulation of mesoionic carbene cobalt complexes. Dalton Trans 2020; 49:2426-2430. [PMID: 32048665 DOI: 10.1039/c9dt04624k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first examples of Co(ii) mesoionic carbene complexes (CoX2DippMIC2; X = Cl-, Br-, I-) demonstrate a new electronic perturbation on tetrahedral Co(ii) complexes. Using absorption spectroscopy and magnetometry, the consequences of the MIC's strong σ-donating/minimal π-accepting nature are analyzed and shown to be further tunable by the nature of the coordinated halide.
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Affiliation(s)
- Alex J Mantanona
- Department of Chemistry and Biochemistry, University of California - San Diego, La Jolla, CA 92093, USA.
| | - Daniel R Tolentino
- Department of Chemistry and Biochemistry, University of California - San Diego, La Jolla, CA 92093, USA.
| | - Kristine S Cay
- Department of Chemistry and Biochemistry, University of California - San Diego, La Jolla, CA 92093, USA.
| | - Milan Gembicky
- Department of Chemistry and Biochemistry, University of California - San Diego, La Jolla, CA 92093, USA.
| | - Rodolphe Jazzar
- Department of Chemistry and Biochemistry, University of California - San Diego, La Jolla, CA 92093, USA.
| | - Guy Bertrand
- Department of Chemistry and Biochemistry, University of California - San Diego, La Jolla, CA 92093, USA.
| | - Jeffrey D Rinehart
- Department of Chemistry and Biochemistry, University of California - San Diego, La Jolla, CA 92093, USA.
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Mondal A, Kharwar AK, Konar S. Sizeable Effect of Lattice Solvent on Field Induced Slow Magnetic Relaxation in Seven Coordinated CoII Complexes. Inorg Chem 2019; 58:10686-10693. [DOI: 10.1021/acs.inorgchem.9b00615] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Arpan Mondal
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, MP, India
| | - Ajit Kumar Kharwar
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, MP, India
| | - Sanjit Konar
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal 462066, MP, India
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12
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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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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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14
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Krzystek J, Kohl G, Hansen HB, Enders M, Telser J. Combining HFEPR and NMR Spectroscopies to Characterize Organochromium(III) Complexes with Large Zero-Field Splitting. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00158] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- J. Krzystek
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Gerald Kohl
- Institute of Inorganic Chemistry, Heidelberg University, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Helge-Boj Hansen
- Institute of Inorganic Chemistry, Heidelberg University, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Markus Enders
- Institute of Inorganic Chemistry, Heidelberg University, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Joshua Telser
- Department of Biological, Physical and Health Sciences, Roosevelt University, 430 S. Michigan Avenue, Chicago, Illinois 60605, United States
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15
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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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16
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Dey M, Mudoi PP, Choudhury A, Sarma B, Gogoi N. Deciphering the influence of structural distortions on the uniaxial magnetic anisotropy of pentagonal bipyramidal Ni(ii) complexes. Chem Commun (Camb) 2019; 55:11547-11550. [DOI: 10.1039/c9cc05032a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Role of structural distortion on the uniaxial magnetic anisotropy of pentagonal bipyramidal Ni(ii) complexes is explored. A simple strategy to enhance the uniaxial magnetic anisotropy in pentagonal bipyramidal Ni(ii) complexes is proposed.
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Affiliation(s)
- Mamon Dey
- Department of Chemical Sciences
- Tezpur University
- Sonitpur
- India
| | | | - Anup Choudhury
- Department of Chemical Sciences
- Tezpur University
- Sonitpur
- India
| | - Bipul Sarma
- Department of Chemical Sciences
- Tezpur University
- Sonitpur
- India
| | - Nayanmoni Gogoi
- Department of Chemical Sciences
- Tezpur University
- Sonitpur
- India
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17
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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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18
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Mondal AK, Mondal A, Dey B, Konar S. Influence of the Coordination Environment on Easy-Plane Magnetic Anisotropy of Pentagonal Bipyramidal Cobalt(II) Complexes. Inorg Chem 2018; 57:9999-10008. [DOI: 10.1021/acs.inorgchem.8b01162] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Amit Kumar Mondal
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal, 462066 Madhya Pradesh, India
| | - Arpan Mondal
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal, 462066 Madhya Pradesh, India
| | - Bijoy Dey
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal, 462066 Madhya Pradesh, India
| | - Sanjit Konar
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal, 462066 Madhya Pradesh, India
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19
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Jin XX, Chen XX, Xiang J, Chen YZ, Jia LH, Wang BW, Cheng SC, Zhou X, Leung CF, Gao S. Slow Magnetic Relaxation in a Series of Mononuclear 8-Coordinate Fe(II) and Co(II) Complexes. Inorg Chem 2018. [PMID: 29521502 DOI: 10.1021/acs.inorgchem.7b03071] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A series of homoleptic mononuclear 8-coordinate FeII and CoII compounds, [FeII(L2)2](ClO4)2 (2), [FeII(L3)2](ClO4)2 (3), [FeII(L4)2](ClO4)2 (4), [CoII(L1)2](ClO4)2 (5), [CoII(L2)2](ClO4)2 (6), [CoII(L3)2](ClO4)2 (7), and [CoII(L4)2](ClO4)2 (8) (L1 and L2 are 2,9-dialkylcarboxylate-1,10-phenanthroline ligands; L3 and L4 are 6,6'-dialkylcarboxylate-2,2'-bipyridine ligands), have been obtained, and their crystal structures have been determined by X-ray crystallography. The metal center in all of these compounds has an oversaturated coordination number of 8, which is completed by two neutral homoleptic tetradentate ligands and is unconventional in 3d-metal compounds. These compounds are further characterized by electronic spectroscopy, cyclic voltammetry (CV), and magnetic measurements. CV measurements of these complexes in MeCN solution exhibit rich redox properties. Magnetic measurements on these compounds demonstrate that the observed single-ion magnetic (SIM) behavior in the previously reported [FeII(L1)2](ClO4)2 (1) is not a contingent case, since all of the 8-coordinate compounds 2-8 exhibit interesting slow magnetic relaxation under applied direct current fields.
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Affiliation(s)
- Xin-Xin Jin
- College of Chemistry and Environmental Engineering , Yangtze University , Jingzhou 434020 , HuBei , P. R. China
| | - Xiao-Xiang Chen
- State Key Laboratory of Rare Earth Materials Chemistry and Applications and PKU-HKU Joint Laboratory on Rare Earth Materials and Bioinorganic Chemistry , Peking University , Beijing 100871 , P. R. China
| | - Jing Xiang
- College of Chemistry and Environmental Engineering , Yangtze University , Jingzhou 434020 , HuBei , P. R. China
| | - Yun-Zhou Chen
- School of Chemistry and Environmental Engineering , Wuhan Institute of Technology , Wuhan 430073 , P. R. China
| | - Li-Hui Jia
- School of Chemistry and Environmental Engineering , Wuhan Institute of Technology , Wuhan 430073 , P. R. China
| | - Bing-Wu Wang
- State Key Laboratory of Rare Earth Materials Chemistry and Applications and PKU-HKU Joint Laboratory on Rare Earth Materials and Bioinorganic Chemistry , Peking University , Beijing 100871 , P. R. China
| | - Shun-Cheung Cheng
- Department of Chemistry , City University of Hong Kong , Tat Chee Avenue, Kowloon Tong , Hong Kong 999077 , P. R. China
| | - Xin Zhou
- College of Chemistry and Environmental Engineering , Yangtze University , Jingzhou 434020 , HuBei , P. R. China
| | - Chi-Fai Leung
- Department of Science and Environmental Studies , The Education University of Hong Kong , 10 Lo Ping Road, Tai Po, NT , Hong Kong 999077 , P. R. China
| | - Song Gao
- State Key Laboratory of Rare Earth Materials Chemistry and Applications and PKU-HKU Joint Laboratory on Rare Earth Materials and Bioinorganic Chemistry , Peking University , Beijing 100871 , P. R. China
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20
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Wang L, Zlatar M, Vlahović F, Demeshko S, Philouze C, Molton F, Gennari M, Meyer F, Duboc C, Gruden M. Experimental and Theoretical Identification of the Origin of Magnetic Anisotropy in Intermediate Spin Iron(III) Complexes. Chemistry 2018; 24:5091-5094. [PMID: 29447424 PMCID: PMC5969241 DOI: 10.1002/chem.201705989] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2017] [Indexed: 11/24/2022]
Abstract
The complexes [FeLN2S2X] [in which LN2S2=2,2′‐(2,2′‐bipryridine‐6,6′‐diyl)bis(1,1′‐diphenylethanethiolate) and X=Cl, Br and I], characterized crystallographically earlier and here (Fe(L)Br), reveal a square pyramidal coordinated FeIII ion. Unusually, all three complexes have intermediate spin ground states. Susceptibility measurements, powder cw X‐ and Q‐band EPR spectra, and zero‐field powder Mössbauer spectra show that all complexes display distinct magnetic anisotropy, which has been rationalized by DFT calculations.
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Affiliation(s)
- Lianke Wang
- University of Grenoble Alpes, DCM, CNRS UMR 5250, Grenoble, France
| | - Matija Zlatar
- Institute of Chemistry, Technology and Metallurgy, University of Belgrade, Serbia
| | - Filip Vlahović
- Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, 11000, Belgrade, Serbia
| | - Serhiy Demeshko
- Institut für Anorganische Chemie, Universität Göttingen, Tammannstr. 4, 37077, Göttingen, Germany
| | | | - Florian Molton
- University of Grenoble Alpes, DCM, CNRS UMR 5250, Grenoble, France
| | - Marcello Gennari
- University of Grenoble Alpes, DCM, CNRS UMR 5250, Grenoble, France
| | - Franc Meyer
- Institut für Anorganische Chemie, Universität Göttingen, Tammannstr. 4, 37077, Göttingen, Germany
| | - Carole Duboc
- University of Grenoble Alpes, DCM, CNRS UMR 5250, Grenoble, France
| | - Maja Gruden
- Faculty of Chemistry, University of Belgrade, Studentski trg 12-16, 11000, Belgrade, Serbia
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21
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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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22
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Pearson TJ, Fataftah MS, Freedman DE. Enhancement of magnetic anisotropy in a Mn-Bi heterobimetallic complex. Chem Commun (Camb) 2018; 52:11394-11397. [PMID: 27711306 DOI: 10.1039/c6cc06369a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A novel Mn2+Bi3+ heterobimetallic complex, featuring the closest MnBi interaction for a paramagnetic molecular species, exhibits unusually large axial zero-field splitting. We attribute this enhancement to the proximity of Mn2+ to a heavy main group element, namely, bismuth.
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Affiliation(s)
- Tyler J Pearson
- Northwestern University, Department of Chemistry, 2145 Sheridan Rd., Evanston, Il 60208, USA.
| | - Majed S Fataftah
- Northwestern University, Department of Chemistry, 2145 Sheridan Rd., Evanston, Il 60208, USA.
| | - Danna E Freedman
- Northwestern University, Department of Chemistry, 2145 Sheridan Rd., Evanston, Il 60208, USA.
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23
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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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24
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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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25
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Drahoš B, Herchel R, Trávníček Z. Impact of Halogenido Coligands on Magnetic Anisotropy in Seven-Coordinate Co(II) Complexes. Inorg Chem 2017; 56:5076-5088. [PMID: 28406642 DOI: 10.1021/acs.inorgchem.7b00235] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The structural and magnetic features of a series of mononuclear seven-coordinate CoII complexes with the general formula [Co(L)X2], where L is a 15-membered pyridine-based macrocyclic ligand (3,12,18-triaza-6,9-dioxabicyclo[12.3.1]octadeca-1(18),14,16-triene) and X = Cl- (1), Br- (2), or I- (3), were investigated experimentally and theoretically in order to reveal how the corresponding halogenido coligands in the apical positions of a distorted pentagonal-bipyramidal coordination polyhedron may affect the magnetic properties of the prepared compounds. The thorough analyses of the magnetic data revealed a large easy-plane type of the magnetic anisotropy (D > 0) for all three compounds, with the D-values increasing in the order 35 cm-1 for 3 (I-), 38 cm-1 for 1 (Cl-), and 41 cm-1 for 2 (Br-). Various theoretical methods like the Angular Overlap Model, density functional theory, CASSCF/CASPT2, CASSCF/NEVPT2 were utilized in order to understand the observed trend in magnetic anisotropy. The D-values correlated well with the Mayer bond order (decreasing in order Co-I > Co-Cl > Co-Br), which could be a consequence of two competing factors: (a) the ligand field splitting and (b) the covalence of the Co-X bond. All the complexes also behave as field-induced single-molecule magnets with the spin reversal barrier Ueff increasing in order 1 (Cl-) < 2 (Br-) < 3 (I-); however, taking into account the easy-plane type of the magnetic anisotropy, the Raman relaxation process is most likely responsible for slow relaxation of the magnetization. The results of the work revealed that the previously suggested and fully accepted strategy employing heavier halogenido ligands in order to increase the magnetic anisotropy has some limitations in the case of pentagonal-bipyramidal CoII complexes.
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Affiliation(s)
- Bohuslav Drahoš
- Department of Inorganic Chemistry, Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacký University , 17. listopadu 12, CZ-771 46 Olomouc, Czech Republic
| | - Radovan Herchel
- Department of Inorganic Chemistry, Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacký University , 17. listopadu 12, CZ-771 46 Olomouc, Czech Republic
| | - Zdeněk Trávníček
- Department of Inorganic Chemistry, Regional Centre of Advanced Technologies and Materials, Faculty of Science, Palacký University , 17. listopadu 12, CZ-771 46 Olomouc, Czech Republic
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26
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Singh SK, Pandey B, Velmurugan G, Rajaraman G. Key role of higher order symmetry and electrostatic ligand field design in the magnetic relaxation of low-coordinate Er(iii) complexes. Dalton Trans 2017; 46:11913-11924. [DOI: 10.1039/c6dt03568j] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Our theoretical analysis highlights that both symmetry and a suitable ligand field is required to obtain large barrier heights in SIMs. Key role of Lanthanide–halogen covalency in enhancing Ueff is discussed.
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Affiliation(s)
- Saurabh Kumar Singh
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai-400076
- India
- Department of Molecular Theory and Spectroscopy
| | - Bhawana Pandey
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai-400076
- India
| | | | - Gopalan Rajaraman
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai-400076
- India
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27
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Yao XN, Yang MW, Xiong J, Liu JJ, Gao C, Meng YS, Jiang SD, Wang BW, Gao S. Enhanced magnetic anisotropy in a tellurium-coordinated cobalt single-ion magnet. Inorg Chem Front 2017. [DOI: 10.1039/c6qi00543h] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fine-tuning of the ligand field of a series of four-coordinate Co(ii) SIMs, yielding the first tellurium-coordinated SIM.
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Affiliation(s)
- Xiao-Nan Yao
- Beijing National Laboratory of Molecular Science
- College of Chemistry and Molecular Engineering
- State Key Laboratory of Rare Earth Materials Chemistry and Applications
- Peking University
- Beijing
| | - Mu-Wen Yang
- Beijing National Laboratory of Molecular Science
- College of Chemistry and Molecular Engineering
- State Key Laboratory of Rare Earth Materials Chemistry and Applications
- Peking University
- Beijing
| | - Jin Xiong
- Beijing National Laboratory of Molecular Science
- College of Chemistry and Molecular Engineering
- State Key Laboratory of Rare Earth Materials Chemistry and Applications
- Peking University
- Beijing
| | - Jia-Jia Liu
- Beijing National Laboratory of Molecular Science
- College of Chemistry and Molecular Engineering
- State Key Laboratory of Rare Earth Materials Chemistry and Applications
- Peking University
- Beijing
| | - Chen Gao
- Beijing National Laboratory of Molecular Science
- College of Chemistry and Molecular Engineering
- State Key Laboratory of Rare Earth Materials Chemistry and Applications
- Peking University
- Beijing
| | - Yin-Shan Meng
- Beijing National Laboratory of Molecular Science
- College of Chemistry and Molecular Engineering
- State Key Laboratory of Rare Earth Materials Chemistry and Applications
- Peking University
- Beijing
| | - Shang-Da Jiang
- Beijing National Laboratory of Molecular Science
- College of Chemistry and Molecular Engineering
- State Key Laboratory of Rare Earth Materials Chemistry and Applications
- Peking University
- Beijing
| | - Bing-Wu Wang
- Beijing National Laboratory of Molecular Science
- College of Chemistry and Molecular Engineering
- State Key Laboratory of Rare Earth Materials Chemistry and Applications
- Peking University
- Beijing
| | - Song Gao
- Beijing National Laboratory of Molecular Science
- College of Chemistry and Molecular Engineering
- State Key Laboratory of Rare Earth Materials Chemistry and Applications
- Peking University
- Beijing
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28
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Shao D, Zhang SL, Shi L, Zhang YQ, Wang XY. Probing the Effect of Axial Ligands on Easy-Plane Anisotropy of Pentagonal-Bipyramidal Cobalt(II) Single-Ion Magnets. Inorg Chem 2016; 55:10859-10869. [DOI: 10.1021/acs.inorgchem.6b00854] [Citation(s) in RCA: 86] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Dong Shao
- State
Key Laboratory of Coordination Chemistry, Collaborative Innovation
Center of Advanced Microstructures, School of Chemistry and Chemical
Engineering, Nanjing University, Nanjing 210023, China
| | - Shao-Liang Zhang
- State
Key Laboratory of Coordination Chemistry, Collaborative Innovation
Center of Advanced Microstructures, School of Chemistry and Chemical
Engineering, Nanjing University, Nanjing 210023, China
| | - Le Shi
- State
Key Laboratory of Coordination Chemistry, Collaborative Innovation
Center of Advanced Microstructures, 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
| | - Xin-Yi Wang
- State
Key Laboratory of Coordination Chemistry, Collaborative Innovation
Center of Advanced Microstructures, School of Chemistry and Chemical
Engineering, Nanjing University, Nanjing 210023, China
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29
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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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30
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Dey M, Dutta S, Sarma B, Deka RC, Gogoi N. Modulation of the coordination environment: a convenient approach to tailor magnetic anisotropy in seven coordinate Co(ii) complexes. Chem Commun (Camb) 2016; 52:753-6. [DOI: 10.1039/c5cc07397a] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Subtle modulation of the coordination environment in seven coordinate Co(ii) complexes leads to a remarkable deviation in the axial zero field splitting parameter (D) in a predictable fashion.
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Affiliation(s)
- Mamon Dey
- Department of Chemical Sciences
- Tezpur University
- Napaam-784028
- India
| | - Snigdha Dutta
- Department of Chemical Sciences
- Tezpur University
- Napaam-784028
- India
| | - Bipul Sarma
- Department of Chemical Sciences
- Tezpur University
- Napaam-784028
- India
| | - Ramesh Ch. Deka
- Department of Chemical Sciences
- Tezpur University
- Napaam-784028
- India
| | - Nayanmoni Gogoi
- Department of Chemical Sciences
- Tezpur University
- Napaam-784028
- India
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31
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Brazzolotto D, Gennari M, Yu S, Pécaut J, Rouzières M, Clérac R, Orio M, Duboc C. An Experimental and Theoretical Investigation on Pentacoordinated Cobalt(III) Complexes with an Intermediate S=
1 Spin State: How Halide Ligands Affect their Magnetic Anisotropy. Chemistry 2015; 22:925-33. [DOI: 10.1002/chem.201502997] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2015] [Indexed: 11/06/2022]
Affiliation(s)
| | | | - Shengying Yu
- Univ. Grenoble Alpes, DCM, CNRS UMR 5250; 38000 Grenoble France
| | - Jacques Pécaut
- Univ. Grenoble Alpes, CEA, INAC-SCIB; 38000 Grenoble France
| | - Mathieu Rouzières
- CNRS, CRPP, UPR 8641; F-33600 Pessac France
- Univ. Bordeaux, CRPP, UPR 8641; F-33600 Pessac France
| | - Rodolphe Clérac
- CNRS, CRPP, UPR 8641; F-33600 Pessac France
- Univ. Bordeaux, CRPP, UPR 8641; F-33600 Pessac France
| | - Maylis Orio
- Aix Marseille Université, ISM2, CNRS UMR 7313; 13397 Marseille France
| | - Carole Duboc
- Univ. Grenoble Alpes, DCM, CNRS UMR 5250; 38000 Grenoble France
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32
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Alvarez S. Distortion Pathways of Transition Metal Coordination Polyhedra Induced by Chelating Topology. Chem Rev 2015; 115:13447-83. [PMID: 26575868 DOI: 10.1021/acs.chemrev.5b00537] [Citation(s) in RCA: 127] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A continuous shape measures analysis of the coordination polyhedra of a host of transition metal complexes with bi- and multidentate ligands discloses the distortion pathway associated with each particular topology of the chelate rings formed. The basic parameter that controls the degree of distortion is the metal-donor atom bond distance that induces nonideal bond angles due to the rigidity of the ligands. Thus, the degree of distortion within each family of complexes depends on the atomic size, on which the high- or low-spin state has a large effect. Special attention is therefore paid to several spin-crossover systems and to the enhanced distortions that go along with the transition from low- to high-spin state affected by temperature, light, or pressure. Several families of complexes show deviations from the expected distortion pathways in the high-spin state that can be associated to the onset of intermolecular interactions such as secondary coordination of counterions or solvent molecules. Also, significant displacement of counterions in an extended solid may result from the changes in metal-ligand bond distances when ligands are involved in intermolecular hydrogen bonding.
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Affiliation(s)
- Santiago Alvarez
- Departament de Química Inorgànica and Institut de Química Teòrica i Computacional, Universitat de Barcelona , Martí i Franquès 1-11, 08028 Barcelona, Spain
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33
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Saber MR, Dunbar KR. Ligands effects on the magnetic anisotropy of tetrahedral cobalt complexes. Chem Commun (Camb) 2015; 50:12266-9. [PMID: 25183324 DOI: 10.1039/c4cc05724d] [Citation(s) in RCA: 160] [Impact Index Per Article: 17.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The effect of ligands with heavy donor atoms on the magnetic anisotropy of the pseudo-tetrahedral cobalt complexes, Co(quinoline)2I2 (1) and Co(EPh3)2I2 (2-3) (E = P, As) has been investigated. The axial zero-field splitting parameter D was found to vary from +9.2 cm(-1) in 1 to -36.9 cm(-1) in 2 and -74.7 cm(-1) in 3. Compounds 2 and 3 exhibit slow relaxation of the magnetization up to 4 K under an applied dc field, indicating SMM behavior.
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Affiliation(s)
- Mohamed R Saber
- Department of Chemistry, Texas A&M University, College Station, TX 77842-3012, USA.
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34
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Samuel PP, Neufeld R, Chandra Mondal K, Roesky HW, Herbst-Irmer R, Stalke D, Demeshko S, Meyer F, Rojisha VC, De S, Parameswaran P, Stückl AC, Kaim W, Christian JH, Bindra JK, Dalal NS. Cr(i)Cl as well as Cr + are stabilised between two cyclic alkyl amino carbenes. Chem Sci 2015; 6:3148-3153. [PMID: 28706686 PMCID: PMC5490427 DOI: 10.1039/c5sc00646e] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2015] [Accepted: 03/20/2015] [Indexed: 11/21/2022] Open
Abstract
Complexes with two and three coordinate chromium(i).
Cr(i)Cl is a very unstable species. The present work describes the stabilisation of Cr(i)Cl in the low coordinate environment of cyclic alkyl(amino) carbene ligands and its synthetic application to yield an unprecedented cationic complex with a two coordinate Cr(i). One electron reduction of (cAAC)2CrCl2 (1) with equivalent amount of KC8 results in the formation of (cAAC)2CrCl (2), with a distorted trigonal planar configuration at the metal centre. SQUID, EPR and theoretical studies reveal a Cr(i) centre with S = 5/2 spin ground state for 2. It represents the first example of a mononuclear Cr complex showing slow relaxation of magnetisation under an applied magnetic field. The chlorine atom in 2 is expected to be prone to further reactions with appropriate reagents. This qualifies 2 as a promising precursor for the preparation of various interesting complexes with Cr(i) in a low coordinate environment. The first example of this metathesis reaction is observed when 2 is treated with Na[B(C6H3(CF3)2)4] resulting in [(cAAC)2Cr]+[B(C6H3(CF3)2)4]–, a linear cationic complex with two coordinate Cr(i) and an S = 5/2 spin ground state.
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Affiliation(s)
- Prinson P Samuel
- Institut für Anorganische Chemie , Georg-August-Universität , Tammannstrasse 4 , D-37077 , Göttingen , Germany . ; ; ; , +49-551-39-33063 ; Tel: +49-551-39-33001, +49-551-39-33000, +49-551-39-33012
| | - Roman Neufeld
- Institut für Anorganische Chemie , Georg-August-Universität , Tammannstrasse 4 , D-37077 , Göttingen , Germany . ; ; ; , +49-551-39-33063 ; Tel: +49-551-39-33001, +49-551-39-33000, +49-551-39-33012
| | - Kartik Chandra Mondal
- Institut für Anorganische Chemie , Georg-August-Universität , Tammannstrasse 4 , D-37077 , Göttingen , Germany . ; ; ; , +49-551-39-33063 ; Tel: +49-551-39-33001, +49-551-39-33000, +49-551-39-33012
| | - Herbert W Roesky
- Institut für Anorganische Chemie , Georg-August-Universität , Tammannstrasse 4 , D-37077 , Göttingen , Germany . ; ; ; , +49-551-39-33063 ; Tel: +49-551-39-33001, +49-551-39-33000, +49-551-39-33012
| | - Regine Herbst-Irmer
- Institut für Anorganische Chemie , Georg-August-Universität , Tammannstrasse 4 , D-37077 , Göttingen , Germany . ; ; ; , +49-551-39-33063 ; Tel: +49-551-39-33001, +49-551-39-33000, +49-551-39-33012
| | - Dietmar Stalke
- Institut für Anorganische Chemie , Georg-August-Universität , Tammannstrasse 4 , D-37077 , Göttingen , Germany . ; ; ; , +49-551-39-33063 ; Tel: +49-551-39-33001, +49-551-39-33000, +49-551-39-33012
| | - Serhiy Demeshko
- Institut für Anorganische Chemie , Georg-August-Universität , Tammannstrasse 4 , D-37077 , Göttingen , Germany . ; ; ; , +49-551-39-33063 ; Tel: +49-551-39-33001, +49-551-39-33000, +49-551-39-33012
| | - Franc Meyer
- Institut für Anorganische Chemie , Georg-August-Universität , Tammannstrasse 4 , D-37077 , Göttingen , Germany . ; ; ; , +49-551-39-33063 ; Tel: +49-551-39-33001, +49-551-39-33000, +49-551-39-33012
| | - Vallyanga Chalil Rojisha
- Department of Chemistry , National Institute of Technology Calicut , 673601 , Kerala , India . ; Tel: +91-495-228-5304
| | - Susmita De
- Department of Chemistry , National Institute of Technology Calicut , 673601 , Kerala , India . ; Tel: +91-495-228-5304
| | - Pattiyil Parameswaran
- Department of Chemistry , National Institute of Technology Calicut , 673601 , Kerala , India . ; Tel: +91-495-228-5304
| | - A Claudia Stückl
- Institut für Anorganische Chemie , Georg-August-Universität , Tammannstrasse 4 , D-37077 , Göttingen , Germany . ; ; ; , +49-551-39-33063 ; Tel: +49-551-39-33001, +49-551-39-33000, +49-551-39-33012
| | - Wolfgang Kaim
- Institut für Anorganische Chemie , Universität Stuttgart , Pfaffenwaldring 55 , D-70569 , Stuttgart , Germany
| | - Jonathan H Christian
- Departments of Chemistry and Biochemistry , Florida State University , Tallahassee , FL 32306-4930 , USA . ; ; Tel: +1-850-644-3398
| | - Jasleen K Bindra
- Departments of Chemistry and Biochemistry , Florida State University , Tallahassee , FL 32306-4930 , USA . ; ; Tel: +1-850-644-3398
| | - Naresh S Dalal
- Departments of Chemistry and Biochemistry , Florida State University , Tallahassee , FL 32306-4930 , USA . ; ; Tel: +1-850-644-3398.,National High Magnetic Field Laboratory , Florida State University , Tallahassee , FL 32306 , USA
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35
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Zhang YZ, Brown AJ, Meng YS, Sun HL, Gao S. Linear trinuclear cobalt(ii) single molecule magnet. Dalton Trans 2015; 44:2865-70. [DOI: 10.1039/c4dt03545c] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The first linear trinuclear [CoII3] SMM was achieved due to significant intracluster ferromagnetic coupling. This study shows that miniscule changes in the coordination environment of the cobalt centers in this structural archetype can have a drastic effect on the observation of SMM behavior.
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Affiliation(s)
- Yuan-Zhu Zhang
- Beijing National Laboratory for Molecular Sciences
- State Key Laboratory of Rare Earth Materials Chemistry and Applications
- College of Chemistry and Molecular Engineering
- Peking University
- 100871 Beijing
| | - Andrew J. Brown
- Department of Chemistry
- Texas A & M University
- College Station
- USA
| | - Yin-Shan Meng
- Beijing National Laboratory for Molecular Sciences
- State Key Laboratory of Rare Earth Materials Chemistry and Applications
- College of Chemistry and Molecular Engineering
- Peking University
- 100871 Beijing
| | - Hao-Ling Sun
- Department of Chemistry
- Beijing Normal University
- Beijing 100875
- P. R. China
| | - Song Gao
- Beijing National Laboratory for Molecular Sciences
- State Key Laboratory of Rare Earth Materials Chemistry and Applications
- College of Chemistry and Molecular Engineering
- Peking University
- 100871 Beijing
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36
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Zhou H, Wang Y, Mou F, Shen X, Liu Y. Low dimensional magnetic assemblies based on MnIII(Schiff base) and/or Mer-tricyanidoferrate building blocks: Syntheses, crystal structures and magnetic properties. Polyhedron 2015. [DOI: 10.1016/j.poly.2014.09.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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37
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Zhou H, Wang Y, Shen X, Liu Y, Yuan A. Tuning the structures of manganese(III) (Schiff base) complexes: Syntheses, crystal structures and magnetic properties. Inorganica Chim Acta 2014. [DOI: 10.1016/j.ica.2014.07.070] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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38
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Liu W, Christian JH, Al-Oweini R, Bassil BS, van Tol J, Atanasov M, Neese F, Dalal NS, Kortz U. Synthesis, Detailed Characterization, and Theoretical Understanding of Mononuclear Chromium(III)-Containing Polyoxotungstates [CrIII(HXVW7O28)2]13– (X = P, As) with Exceptionally Large Magnetic Anisotropy. Inorg Chem 2014; 53:9274-83. [DOI: 10.1021/ic501385r] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Wenjing Liu
- Jacobs University, School of Engineering and Science, P.O. Box 750561, 28725 Bremen, Germany
| | - Jonathan H. Christian
- Department of Chemistry and Biochemistry, Florida State University, 95 Chieftan Way, Tallahassee, Florida 32306, United States
- National High Magnetic Field Laboratory, Florida State University, 1800 E Paul Dirac Drive, Tallahassee, Florida 32306, United States
| | - Rami Al-Oweini
- Jacobs University, School of Engineering and Science, P.O. Box 750561, 28725 Bremen, Germany
| | - Bassem S. Bassil
- Jacobs University, School of Engineering and Science, P.O. Box 750561, 28725 Bremen, Germany
| | - Johan van Tol
- National High Magnetic Field Laboratory, Florida State University, 1800 E Paul Dirac Drive, Tallahassee, Florida 32306, United States
| | - Mihail Atanasov
- Max-Planck Institute for Chemical Energy Conversion, Stiftstrasse
34-36, 45470 Mülheim/Ruhr, Germany
- Institute for General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
| | - Frank Neese
- Max-Planck Institute for Chemical Energy Conversion, Stiftstrasse
34-36, 45470 Mülheim/Ruhr, Germany
| | - Naresh S. Dalal
- Department of Chemistry and Biochemistry, Florida State University, 95 Chieftan Way, Tallahassee, Florida 32306, United States
- National High Magnetic Field Laboratory, Florida State University, 1800 E Paul Dirac Drive, Tallahassee, Florida 32306, United States
| | - Ulrich Kortz
- Jacobs University, School of Engineering and Science, P.O. Box 750561, 28725 Bremen, Germany
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39
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Hunter SC, Podlesnyak AA, Xue ZL. Magnetic Excitations in Metalloporphyrins by Inelastic Neutron Scattering: Determination of Zero-Field Splittings in Iron, Manganese, and Chromium Complexes. Inorg Chem 2014; 53:1955-61. [DOI: 10.1021/ic4028354] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Seth C. Hunter
- Department
of Chemistry, The University of Tennessee, 1420 Circle Drive, Knoxville, Tennessee 37996, United States
| | - Andrey A. Podlesnyak
- Quantum
Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States
| | - Zi-Ling Xue
- Department
of Chemistry, The University of Tennessee, 1420 Circle Drive, Knoxville, Tennessee 37996, United States
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40
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Zadrozny JM, Telser J, Long JR. Slow magnetic relaxation in the tetrahedral cobalt(II) complexes [Co(EPh)4]2− (EO, S, Se). Polyhedron 2013. [DOI: 10.1016/j.poly.2013.04.008] [Citation(s) in RCA: 148] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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41
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Atanasov M, Zadrozny JM, Long JR, Neese F. A theoretical analysis of chemical bonding, vibronic coupling, and magnetic anisotropy in linear iron(ii) complexes with single-molecule magnet behavior. Chem Sci 2013. [DOI: 10.1039/c2sc21394j] [Citation(s) in RCA: 220] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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42
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Singh SK, Pedersen KS, Sigrist M, Thuesen CA, Schau-Magnussen M, Mutka H, Piligkos S, Weihe H, Rajaraman G, Bendix J. Angular dependence of the exchange interaction in fluoride-bridged GdIII–CrIII complexes. Chem Commun (Camb) 2013; 49:5583-5. [DOI: 10.1039/c3cc42552e] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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43
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Abstract
The symmetric, high-spin triiron complex ((Ph)L)Fe(3)(THF)(3) reacts with mild chemical oxidants (e.g., Ph(3)C-X, I(2)) to afford an asymmetric core, where one iron bears the halide ligand ((Ph)L)Fe(3)X(L) and the hexadentate ((Ph)L = MeC(CH(2)NPh-o-NPh)(3)) ligand has undergone significant rearrangement. In the absence of a suitable trapping ligand, the chlorine and bromine complexes form (μ-X)(2)-bridged structures of the type [((Ph)L)Fe(3)(μ-X)](2). In the trinuclear complexes, the halide-bearing iron site sits in approximate trigonal-bipyramidal (tbp) geometry, formed by two ((Ph)L) anilides and an exogenous solvent molecule. The two distal iron atoms reside in distorted square-planar sites featuring a short Fe-Fe separation at 2.301 Å, whereas the distance to the tbp site is substantially elongated (2.6-2.7 Å). Zero-field, (57)Fe Mössbauer analysis reveals the diiron unit as the locus of oxidation, while the tbp site bearing the halide ligand remains divalent. Magnetic data acquired for the series reveal that the oxidized diiron unit comprises a strongly coupled S = (3)/(2) unit that is weakly ferromagnetically coupled to the high-spin (S = 2) ferrous site, giving an overall S = (7)/(2) ground state for the trinuclear units.
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Affiliation(s)
- Emily V Eames
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, Massachusetts 02138, USA
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44
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Maganas D, Krzystek J, Ferentinos E, Whyte AM, Robertson N, Psycharis V, Terzis A, Neese F, Kyritsis P. Investigating magnetostructural correlations in the pseudooctahedral trans-[Ni(II){(OPPh2)(EPPh2)N}2(sol)2] complexes (E = S, Se; sol = DMF, THF) by magnetometry, HFEPR, and ab initio quantum chemistry. Inorg Chem 2012; 51:7218-31. [PMID: 22697407 DOI: 10.1021/ic300453y] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
In this work, magnetometry and high-frequency and -field electron paramagnetic resonance spectroscopy (HFEPR) have been employed in order to determine the spin Hamiltonian (SH) parameters of the non-Kramers, S = 1, pseudooctahedral trans-[Ni(II){(OPPh(2))(EPPh(2))N}(2)(sol)(2)] (E = S, Se; sol = DMF, THF) complexes. X-ray crystallographic studies on these compounds revealed a highly anisotropic NiO(4)E(2) coordination environment, as well as subtle structural differences, owing to the nature of the Ni(II)-coordinated solvent molecule or ligand E atoms. The effects of these structural characteristics on the magnetic properties of the complexes were investigated. The accurately HFEPR-determined SH zero-field-splitting (zfs) D and E parameters, along with the structural data, provided the basis for a systematic density functional theory (DFT) and multiconfigurational ab initio computational analysis, aimed at further elucidating the electronic structure of the complexes. DFT methods yielded only qualitatively useful data. However, already entry level ab initio methods yielded good results for the investigated magnetic properties, provided that the property calculations are taken beyond a second-order treatment of the spin-orbit coupling (SOC) interaction. This was achieved by quasi-degenerate perturbation theory, in conjunction with state-averaged complete active space self-consistent-field calculations. The accuracy in the calculated D parameters improves upon recovering dynamic correlation with multiconfigurational ab initio methods, such as the second-order N-electron valence perturbation theory NEVPT2, the difference dedicated configuration interaction, and the spectroscopy-oriented configuration interaction. The calculations showed that the magnitude of D (∼3-7 cm(-1)) in these complexes is mainly dominated by multiple SOC contributions, the origin of which was analyzed in detail. In addition, the observed largely rhombic regime (E/D = 0.16-0.33) is attributed to the highly distorted metal coordination sphere. Of special importance is the insight by this work on the zfs effects of Se coordination to Ni(II). Overall, a combined experimental and theoretical methodology is provided, as a means to probe the electronic structure of octahedral Ni(II) complexes.
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Affiliation(s)
- Dimitrios Maganas
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, 15771 Athens, Greece
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45
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Ye S, Neese F. How Do Heavier Halide Ligands Affect the Signs and Magnitudes of the Zero-Field Splittings in Halogenonickel(II) Scorpionate Complexes? A Theoretical Investigation Coupled to Ligand-Field Analysis. J Chem Theory Comput 2012; 8:2344-51. [PMID: 26588967 DOI: 10.1021/ct300237f] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
This work presents a detailed analysis of the physical origin of the zero-field splittings (ZFSs) in a series of high-spin (S = 1) nickel(II) scorpionate complexes Tp*NiX (Tp* = hydrotris(3,5-dimethylpyrazole)borate, X = Cl, Br, I) using quantum chemical approaches. High-frequency and -field electron paramagnetic resonance studies have shown that the complexes with heavier halide ligands (Br, I) have greater magnitudes but opposite signs of the ZFSs compared with the chloro congener (Desrochers, P. J.; Telser, J.; Zvyagin, S. A.; Ozarowski, A.; Krzystek, J.; Vicic, D. A. Inorg. Chem.2006, 45, 8930-8941). To rationalize the experimental findings, quantum chemical calculations of the ZFSs in this Ni(II) halide series have been conducted. The computed ZFS using wave-function-based ab initio methods (state-averaged CASSCF, NEVPT2, and SORCI) are in good agreement with the experiment. For comparison, density functional theory was only marginally successful. The ligand-field analysis demonstrates that the signs and magnitudes of the ZFSs are subtly determined by the trade-off between the negative contributions from the (1,3)A1(1e→2e) transitions relative to the positive contributions from the remaining d-d excited states. The term from (1,3)A1(1e→2e) stems from the structural feature that the metal center displaces out of the equatorial plane, and gains the importance when heavier halide ligand is involved.
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Affiliation(s)
- Shengfa Ye
- Max-Planck Institute for Bioinorganic Chemistry , Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Frank Neese
- Max-Planck Institute for Bioinorganic Chemistry , Stiftstrasse 34-36, D-45470 Mülheim an der Ruhr, Germany
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46
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Scarborough CC, Sproules S, Doonan CJ, Hagen KS, Weyhermüller T, Wieghardt K. Scrutinizing Low-Spin Cr(II) Complexes. Inorg Chem 2012; 51:6969-82. [DOI: 10.1021/ic300882r] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Christopher C. Scarborough
- Max-Planck-Institut für Bioanorganische Chemie, Stiftstraße
34-36, D-45470 Mülheim an der Ruhr, Germany
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta Georgia
30322, United States
| | - Stephen Sproules
- EPSRC
National UK EPR Facility
and Service, Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K
| | - Christian J. Doonan
- School of Chemistry and Physics, The University of Adelaide, SA 5005, Australia
| | - Karl S. Hagen
- Department of Chemistry, Emory University, 1515 Dickey Drive, Atlanta Georgia
30322, United States
| | - Thomas Weyhermüller
- Max-Planck-Institut für Bioanorganische Chemie, Stiftstraße
34-36, D-45470 Mülheim an der Ruhr, Germany
| | - Karl Wieghardt
- Max-Planck-Institut für Bioanorganische Chemie, Stiftstraße
34-36, D-45470 Mülheim an der Ruhr, Germany
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47
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Goswami T, Misra A. Ligand effects toward the modulation of magnetic anisotropy and design of magnetic systems with desired anisotropy characteristics. J Phys Chem A 2012; 116:5207-15. [PMID: 22568449 DOI: 10.1021/jp3006603] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Magnetic anisotropy of a set of octahedral Cr(III) complexes is studied theoretically. The magnetic anisotropy is quantified in terms of zero-field splitting (ZFS) parameter D, which appeared sensitive toward ligand substitution. The increased π-donation capacity of the ligand enhances the magnetic anisotropy of the complexes. The axial π-donor ligand of a complex is found to produce an easy-plane type (D > 0) magnetic anisotropy, while the replacement of the axial ligands with π-acceptors entails the inversion of magnetic anisotropy into the easy-axis type (D < 0). This observation enables one to fabricate a single molecule magnet for which easy-axis type magnetic anisotropy is an indispensable criterion. The equatorial ligands are also found to play a role in tuning the magnetic anisotropy. The magnetic anisotropy property is also correlated with the nonlinear optical (NLO) response. The value of the first hyperpolarizability varies proportionately with the magnitude of the ZFS parameter. Finally, it has also been shown that a rational design of simple octahedral complexes with desired anisotropy characteristics is possible through the proper ligand selection.
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Affiliation(s)
- Tamal Goswami
- Department of Chemistry, University of North Bengal, Siliguri, Darjeeling 734013, West Bengal, India
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48
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Batchelor LJ, Sangalli M, Guillot R, Guihéry N, Maurice R, Tuna F, Mallah T. Pentanuclear Cyanide-Bridged Complexes Based on Highly Anisotropic CoII Seven-Coordinate Building Blocks: Synthesis, Structure, and Magnetic Behavior. Inorg Chem 2011; 50:12045-52. [DOI: 10.1021/ic201534e] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Luke J. Batchelor
- Institut de
Chimie Moléculaire
et des Matériaux d’Orsay, CNRS, Université Paris-Sud 11, 91405 Orsay, France
| | - Marco Sangalli
- Institut de
Chimie Moléculaire
et des Matériaux d’Orsay, CNRS, Université Paris-Sud 11, 91405 Orsay, France
| | - Régis Guillot
- Institut de
Chimie Moléculaire
et des Matériaux d’Orsay, CNRS, Université Paris-Sud 11, 91405 Orsay, France
| | - Nathalie Guihéry
- Laboratoire de Chimie et Physique
Quantiques, CNRS, Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex 09, France
| | - Remi Maurice
- Laboratoire de Chimie et Physique
Quantiques, CNRS, Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cedex 09, France
- Departament de Quı́mica
Fı́sica i Inorganica, Universitat Rovira i Virgili, Marcel.lı́ Domingo s/n,
43007 Tarragona, Spain
| | - Floriana Tuna
- School of Chemistry, The University of Manchester, Oxford Road, Manchester
M13 9PL, United Kingdom
| | - Talal Mallah
- Institut de
Chimie Moléculaire
et des Matériaux d’Orsay, CNRS, Université Paris-Sud 11, 91405 Orsay, France
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