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Ahmed S, Kumar A, Mukhopadhyay N, Lloret F, Mukherjee R. Heterobimetallic cyanide-bridged Fe III(μ-CN)M II complexes (M = Mn and Cu): synthesis, structure and magnetism. NEW J CHEM 2022. [DOI: 10.1039/d2nj00126h] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Systematic magneto-structural studies reveal ‘[FeIII(Tp)(CN)2(μ-CN)MnIICl(L1/L2)]′ (both antiferromagnetic) and [FeIII(Tp)(CN)2(μ-CN)CuII(L1/L2)]+′(L1 ferro- and L2 antiferromagnetic).
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Affiliation(s)
- Sayeed Ahmed
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208 016, India
| | - Akhilesh Kumar
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208 016, India
| | - Narottam Mukhopadhyay
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, West Bengal 741 246, India
| | - Francesc Lloret
- Departament de Química Inorgànica/Instituto de Ciencia Molecular (ICMOL), Universitat de València, Polígono de la Coma, s/n, 46980 Paterna, València, Spain
| | - Rabindranath Mukherjee
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208 016, India
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2
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Insight into the reaction mechanism and charge transfer analysis for the alkylation of benzene with propylene over H-beta zeolite. MOLECULAR CATALYSIS 2018. [DOI: 10.1016/j.mcat.2018.05.010] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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3
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A serials of sandwich-like trinuclear and one-dimensional chain cyanide-bridged iron(III)-copper(II) complexes: Syntheses, crystal structures and magnetic properties. J SOLID STATE CHEM 2018. [DOI: 10.1016/j.jssc.2018.01.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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4
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Yadav A, Lama P, Bieńko A, Bieńko D, Siddiqui KA. H-bonded supramolecular synthon induced magnetic superexchange phenomenon results weak ferromagnetic and strong antiferromagnetic interactions in two new copper-orotate coordination network. Polyhedron 2018. [DOI: 10.1016/j.poly.2017.11.047] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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5
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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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6
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Majee MC, Towsif Abtab SM, Mondal D, Maity M, Weselski M, Witwicki M, Bieńko A, Antkowiak M, Kamieniarz G, Chaudhury M. Synthesis and magneto-structural studies on a new family of carbonato bridged 3d–4f complexes featuring a [CoII3LnIII3(CO3)] (Ln = La, Gd, Tb, Dy and Ho) core: slow magnetic relaxation displayed by the cobalt(ii)–dysprosium(iii) analogue. Dalton Trans 2018; 47:3425-3439. [DOI: 10.1039/c7dt04389a] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new series of carbonato-bridged complexes containing a CoII3LnIII3 core have been synthesized.
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Affiliation(s)
- Mithun Chandra Majee
- Department of Inorganic Chemistry
- Indian Association for the Cultivation of Science
- Kolkata 700 032
- India
| | - Sk Md Towsif Abtab
- Department of Inorganic Chemistry
- Indian Association for the Cultivation of Science
- Kolkata 700 032
- India
| | - Dhrubajyoti Mondal
- Department of Inorganic Chemistry
- Indian Association for the Cultivation of Science
- Kolkata 700 032
- India
| | - Manoranjan Maity
- Department of Inorganic Chemistry
- Indian Association for the Cultivation of Science
- Kolkata 700 032
- India
| | - Marek Weselski
- Faculty of Chemistry
- University of Wroclaw
- 50-383 Wroclaw
- Poland
| | - Maciej Witwicki
- Faculty of Chemistry
- University of Wroclaw
- 50-383 Wroclaw
- Poland
| | - Alina Bieńko
- Faculty of Chemistry
- University of Wroclaw
- 50-383 Wroclaw
- Poland
| | - Michał Antkowiak
- Faculty of Physics
- A. Mickiewicz University
- PL-61-614 Poznań
- Poland
| | | | - Muktimoy Chaudhury
- Department of Inorganic Chemistry
- Indian Association for the Cultivation of Science
- Kolkata 700 032
- India
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7
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Comparison of the infrared absorptivities of some Prussian blue analogues and their use to determine the composition of core–shell particles. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.05.039] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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8
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Zhang D, Zhang H. A series of chiral cyanide-bridged Fe–Cu complexes: Synthesis, crystal structures and magnetic properties. Polyhedron 2015. [DOI: 10.1016/j.poly.2015.07.024] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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9
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Zhang D, Kong L, Zhang H, Chen K. Synthesis, crystal structures, and magnetic properties of three pairs of chiral cyanide-bridged Fe(III)–Cu(II) enantiomeric complexes. J COORD CHEM 2015. [DOI: 10.1080/00958972.2015.1080360] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Daopeng Zhang
- College of Chemical Engineering, Shandong University of Technology, Zibo, PR China
| | - Lingqian Kong
- Dongchang College, Liaocheng University, Liaocheng, PR China
| | - Hongyan Zhang
- College of Chemical Engineering, Shandong University of Technology, Zibo, PR China
| | - Kexun Chen
- College of Chemical Engineering, Shandong University of Technology, Zibo, PR China
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10
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Ramanantoanina H, Cimpoesu F, Göttel C, Sahnoun M, Herden B, Suta M, Wickleder C, Urland W, Daul C. Prospecting Lighting Applications with Ligand Field Tools and Density Functional Theory: A First-Principles Account of the 4f(7)-4f(6)5d(1) Luminescence of CsMgBr3:Eu(2+). Inorg Chem 2015; 54:8319-26. [PMID: 26270436 DOI: 10.1021/acs.inorgchem.5b00988] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The most efficient way to provide domestic lighting nowadays is by light-emitting diodes (LEDs) technology combined with phosphors shifting the blue and UV emission toward a desirable sunlight spectrum. A route in the quest for warm-white light goes toward the discovery and tuning of the lanthanide-based phosphors, a difficult task, in experimental and technical respects. A proper theoretical approach, which is also complicated at the conceptual level and in computing efforts, is however a profitable complement, offering valuable structure-property rationale as a guideline in the search of the best materials. The Eu(2+)-based systems are the prototypes for ideal phosphors, exhibiting a wide range of visible light emission. Using the ligand field concepts in conjunction with density functional theory (DFT), conducted in nonroutine manner, we develop a nonempirical procedure to investigate the 4f(7)-4f(6)5d(1) luminescence of Eu(2+) in the environment of arbitrary ligands, applied here on the CsMgBr3:Eu(2+)-doped material. Providing a salient methodology for the extraction of the relevant ligand field and related parameters from DFT calculations and encompassing the bottleneck of handling large matrices in a model Hamiltonian based on the whole set of 33,462 states, we obtained an excellent match with the experimental spectrum, from first-principles, without any fit or adjustment. This proves that the ligand field density functional theory methodology can be used in the assessment of new materials and rational property design.
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Affiliation(s)
- Harry Ramanantoanina
- Department of Chemistry, University of Fribourg , Chemin du Musée 9, 1700 Fribourg, Switzerland
| | - Fanica Cimpoesu
- Institute of Physical Chemistry , Splaiul Independentei 202, Bucharest 060021, Romania
| | - Christian Göttel
- Department of Chemistry, University of Fribourg , Chemin du Musée 9, 1700 Fribourg, Switzerland
| | - Mohammed Sahnoun
- Laboratoire de physique de la matière et modélisation mathématique LPQ3M, Université de Mascara , Mascara, Algerie
| | - Benjamin Herden
- Department of Chemistry, University of Fribourg , Chemin du Musée 9, 1700 Fribourg, Switzerland
| | - Markus Suta
- Faculty of Science and Technology, University of Siegen , Adolf-Reichwein Strasse 2, 57068 Siegen, Germany
| | - Claudia Wickleder
- Faculty of Science and Technology, University of Siegen , Adolf-Reichwein Strasse 2, 57068 Siegen, Germany
| | - Werner Urland
- Department of Chemistry, University of Fribourg , Chemin du Musée 9, 1700 Fribourg, Switzerland
| | - Claude Daul
- Department of Chemistry, University of Fribourg , Chemin du Musée 9, 1700 Fribourg, Switzerland
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11
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Baniasadi F, Tehranchi MM, Fathi MB, Safari N, Amani V. Intra-molecular magnetic exchange interaction in the tripyridinium bis[tetrachloroferrate(iii)] chloride molecular magnet: a broken symmetry-DFT study. Phys Chem Chem Phys 2015; 17:19119-25. [PMID: 26126887 DOI: 10.1039/c5cp02770e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The investigation of magnetic ordering in magnetic molecular conductors is the subject of ongoing research studies in the fields of condensed matter physics, chemistry and material sciences. Following the photo-magnetic behavior already observed in individual (FeCl4)2(py·H)3Cl molecules at room temperature, magnetic ordering is studied in this work. Calculations are performed using spin projected broken symmetry via density functional theory within the scheme of the B3LYP approximation. The value of the intra-molecular magnetic coupling constant is obtained as J = 13.2062 kJ mol(-1). A field dependent magnetization experiment is conducted to validate the magnitude and the sign of the exchange constant. Reasonable consistency of experimental and theoretical results confirms the presence of a positive intra-molecular indirect exchange interaction. This work paves the way for possible introduction of a new molecule in the development of advanced molecular electronic devices.
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Affiliation(s)
- F Baniasadi
- Physics Department, Shahid Beheshti University, Tehran, Iran.
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12
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Towards multifunctional magnetic systems through molecular-programmed self assembly of Re(IV) metalloligands. Coord Chem Rev 2015. [DOI: 10.1016/j.ccr.2014.11.007] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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13
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Kitagawa Y, Asaoka M, Miyagi K, Matsui T, Nihei M, Oshio H, Okumura M, Nakano M. DFT and TD-DFT studies of electronic structures and one-electron excitation states of a cyanide-bridged molecular square complex. Inorg Chem Front 2015. [DOI: 10.1039/c5qi00091b] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The electronic structures and physical properties of [Co2Fe2(CN)6(tp*)2(dtbbpy)4](PF6)2·2MeOH are investigated by DFT and TD-DFT calculations.
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Affiliation(s)
- Yasutaka Kitagawa
- Graduate School of Engineering Science
- Science
- Osaka University
- Toyonaka
- Japan
| | - Mizuki Asaoka
- Graduate School of Engineering Science
- Science
- Osaka University
- Toyonaka
- Japan
| | - Koji Miyagi
- Graduate School of Engineering Science
- Science
- Osaka University
- Toyonaka
- Japan
| | - Toru Matsui
- Graduate School of Science
- Osaka University
- Toyonaka
- Japan
| | - Masayuki Nihei
- Graduate School of Pure and Applied Sciences
- University of Tsukuba
- Tsukuba
- Japan
| | - Hiroshi Oshio
- Graduate School of Pure and Applied Sciences
- University of Tsukuba
- Tsukuba
- Japan
| | | | - Masayoshi Nakano
- Graduate School of Engineering Science
- Science
- Osaka University
- Toyonaka
- Japan
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14
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Alexandru M, Visinescu D, Marino N, De Munno G, Vallejo J, Lloret F, Julve M. Cyanido‐Bearing Cobalt(II/III) Metalloligands – Synthesis, Crystal Structure, and Magnetic Properties. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201402190] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Maria‐Gabriela Alexandru
- Department of Inorganic Chemistry, Physical Chemistry and Electrochemistry, Faculty of Applied Chemistry and Materials Science, University “Politehnica” of Bucharest, 1–7 Gh. Polizu Street, 011061 Bucharest, Romania, http://www.upb.ro
| | - Diana Visinescu
- Coordination and Supramolecular Chemistry Laboratory, “Ilie Murgulescu” Institute of Physical Chemistry, Romanian Academy, Splaiul Independentei 202, Bucharest 060021, Romania
| | - Nadia Marino
- Dipartimento di Chimica e Tecnologie Chimiche, Università della Calabria, Via P. Bucci 14/c, 87030 Arcavarcada di Rende (Consenza), Italy
- Department of Chemistry, Syracuse University, Syracuse, NY 13244‐4100, USA
| | - Giovanni De Munno
- Dipartimento di Chimica e Tecnologie Chimiche, Università della Calabria, Via P. Bucci 14/c, 87030 Arcavarcada di Rende (Consenza), Italy
| | - Julia Vallejo
- Departament de Química Inorgànica/Instituto de Ciencia Molecular, Facultat de Química de la Universitat de València, C/ Catedrático José Beltrán, 46980 Paterna, València, Spain, http://www.uv.es
| | - Francesc Lloret
- Departament de Química Inorgànica/Instituto de Ciencia Molecular, Facultat de Química de la Universitat de València, C/ Catedrático José Beltrán, 46980 Paterna, València, Spain, http://www.uv.es
| | - Miguel Julve
- Departament de Química Inorgànica/Instituto de Ciencia Molecular, Facultat de Química de la Universitat de València, C/ Catedrático José Beltrán, 46980 Paterna, València, Spain, http://www.uv.es
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15
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Zhang D, Zhuo S, Wang P, Chen X, Jiang J. A new series of cyanide-bridged heterobimetallic FeIII–FeIII/MnIII/CuII one-dimensional complexes: synthesis, crystal structures, and magnetic properties. NEW J CHEM 2014. [DOI: 10.1039/c4nj00743c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Four new cyanide-bridged FeIII–FeIII/MnIII/CuII one-dimensional complexes have been assembled using K[Fe(bpdBrb)(CN)2]·2H2O (1) as building blocks, and structurally characterized and magnetically investigated.
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Affiliation(s)
- Daopeng Zhang
- College of Chemical Engineering
- Shandong University of Technology
- Zibo 255049, China
- Department of Chemistry
- University of Science and Technology Beijing
| | - Shuping Zhuo
- College of Chemical Engineering
- Shandong University of Technology
- Zibo 255049, China
| | - Ping Wang
- College of Chemical Engineering
- Shandong University of Technology
- Zibo 255049, China
| | - Xia Chen
- College of Chemical Engineering
- Shandong University of Technology
- Zibo 255049, China
| | - Jianzhuang Jiang
- Department of Chemistry
- University of Science and Technology Beijing
- Beijing 100083, China
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16
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Singh SK, Rajaraman G. Can anisotropic exchange be reliably calculated using density functional methods? A case study on trinuclear Mn(III)-M(III)-Mn(III) (M=Fe, Ru, and Os) cyanometalate single-molecule magnets. Chemistry 2013; 20:113-23. [PMID: 24288194 DOI: 10.1002/chem.201303489] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2013] [Indexed: 11/05/2022]
Abstract
Density functional studies have been performed on a set of trinuclear single-molecule magnets (SMMs) of general formula [{Mn2(5-Br salen)2(MeOH)2}M(CN)6](NEt4) (M=Fe(III) (1), Ru(III) (2) and Os(III) (3); 5-Brsalen=N,N'-ethylenebis(5-bromosalicylidene)iminato anion). We have computed the orbital-dependent exchange interaction for all three complexes for the first time using DFT and complete active space self-consistent field (CASSCF) methods. DFT calculations yield the anisotropic exchange as J(ξξ)=3.5 cm(-1) for 1; J(ξξ)=12.1 cm(-1), J(ζζ)=-6.9 cm(-1) and J(ηη)=-14 cm(-1) for 2; and J(ξξ)=23.7 cm(-1) and J(ζζ) =-11.1 cm(-1) for 3. The computed values are in agreement with the experimental report, and this suggests that the established methodology can be used to compute the anisotropic exchange in larger clusters. Our calculations reiterate the fact that the exchange is described by a three-axis anisotropic exchange for complexes 2 and 3 as evidenced by the experiments. A stronger exchange coupling as we move down the periodic table from 3d to 5d is reproduced by our calculations, and the origin of this enhancement in the exchange interaction has been probed by using molecular orbital analysis. The electronic origin of different types of exchange observed in this series is found to be related to the energy difference between possible degenerate pairs and the nature of orbital interactions. By computing the exchange interaction, the single-ion anisotropy of Mn(III) and zero-field splitting of the S=9/2 ground state of complexes 1-3 using CASSCF and/or DFT methods, we have attempted to shed light on the issue of anisotropic exchange and the barrier height for the magnetisation reversal in SMMs. Comprehensive magneto-structural correlations have been developed to offer clues on how to further enhance the barrier height in this class of SMMs.
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Affiliation(s)
- Saurabh Kumar Singh
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076 (India), Fax: +91-(0)22-2576-7152
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17
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Atanasov M, Comba P, Helmle S. Cyanide-Bridged FeIII–CuII Complexes: Jahn–Teller Isomerism and Its Influence on the Magnetic Properties. Inorg Chem 2012; 51:9357-68. [DOI: 10.1021/ic301122h] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mihail Atanasov
- Anorganisch-Chemisches
Institut,
INF 270, Universität Heidelberg,
D-69120 Heidelberg, Germany
- Max-Planck-Institut für Chemische Energiekonversion, Stiftstr. 34-36,
D-45470 Mülheim an der Ruhr, Germany
- Institute of General and Inorganic
Chemistry, Bulgarian Academy of Sciences, Acad.Georgi Bontchev Str. Bl.11, 1113 Sofia, Bulgaria
| | - Peter Comba
- Anorganisch-Chemisches
Institut,
INF 270, Universität Heidelberg,
D-69120 Heidelberg, Germany
| | - Stefan Helmle
- Anorganisch-Chemisches
Institut,
INF 270, Universität Heidelberg,
D-69120 Heidelberg, Germany
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18
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Meskaldji S, Zaiter A, Belkhiri L, Boucekkine A. A relativistic DFT study of magnetic exchange coupling in ketimide bimetallic uranium(IV) complexes. Theor Chem Acc 2012. [DOI: 10.1007/s00214-012-1151-9] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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19
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Meskaldji S, Belkhiri A, Belkhiri L, Boucekkine A, Ephritikhine M. Magnetic exchange coupling in imido bimetallic uranium(V) complexes. A relativistic DFT study. CR CHIM 2012. [DOI: 10.1016/j.crci.2011.07.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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20
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Dicyanometalate chemistry: A type of versatile building block for the construction of cyanide-bridged molecular architectures. Coord Chem Rev 2012. [DOI: 10.1016/j.ccr.2011.10.029] [Citation(s) in RCA: 108] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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21
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Density functional theory study of the magnetic coupling interaction in a series of binuclear oxalate complexes. MONATSHEFTE FUR CHEMIE 2012. [DOI: 10.1007/s00706-011-0705-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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22
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Atanasov M, Comba P, Hanson GR, Hausberg S, Helmle S, Wadepohl H. Cyano-bridged Homodinuclear Copper(II) Complexes. Inorg Chem 2011; 50:6890-901. [DOI: 10.1021/ic102430a] [Citation(s) in RCA: 26] [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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23
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Martínez-Lillo J, Mastropietro TF, De Munno G, Lloret F, Julve M, Faus J. Enhancing the magnetic coupling of oxalato-bridged Re(IV)2M(II) (M=Mn, Co, Ni, and Cu) trinuclear complexes via peripheral halide ligand effects. Inorg Chem 2011; 50:5731-9. [PMID: 21612191 DOI: 10.1021/ic200531s] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Four heterotrinuclear Re(IV)(2)M(II) compounds of general formula (NBu(4))(2)[{Re(IV)Br(4)(μ-ox)}(2)M(II)(Him)(2)] [NBu(4)(+) = tetra-n-butylammonium cation, ox = oxalate, Him = imidazole; M = Mn (1), Co (2), Ni (3), and Cu (4)] have been synthesized by using the novel mononuclear complex [Re(IV)Br(4)(ox)](2-) as a ligand toward divalent first-row transition metal ions in the presence of imidazole. Compounds 1-4 are isostructural complexes whose structure contains discrete trinuclear [{Re(IV)Br(4)(μ-ox)}(2)M(II)(Him)(2)](2-) anions and bulky NBu(4)(+) cations. The Re and M atoms are six-coordinated: four peripheral bromo and two oxalate-oxygens (at Re), and two cis-coordinated imidazole molecules and four oxygen atoms from two oxalate ligands (at M), build distorted octahedral surroundings. Two peripheral [ReBr(4)(ox)](2-) units act as bidentate ligands through the oxalate group toward the central [M(II)(Him)(2)] fragment affording the trinuclear entities. The values of the intramolecular Re···M separation are 5.62(1) (1), 5.51(1) (2), 5.46(1) (3), and 5.55(1) Å (4). Magnetic susceptibility measurements on polycrystalline samples of 1-4 in the temperature range of 1.9-300 K show the occurrence of intramolecular antiferro- [J = -1.1 cm(-1) (1)] and ferromagnetic interactions [J = +3.9 (2), +19.7 (3), and +14.4 cm(-1) (4)], the Hamiltonian being defined as Ĥ = -J [Ŝ(M)(Ŝ(Re1) + Ŝ(Re2))]. The larger spin delocalization on the oxalato bridge in 1-4 when compared to the trinuclear Re(IV)(2)M(II) complexes with chloro instead of bromo as peripheral ligands (1'-4') accounts for the strengthening of the magnetic interactions in 1-4 [J = -0.35 (1'), +14.2 (3'), and +7.7 cm(-1) (4')]. An incipient frequency dependence of the out-of-phase ac signals of 3 at very low temperatures is reminiscent of a system with slow relaxation of the magnetization, a phenomenon characteristic of single-molecule magnet behavior.
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Affiliation(s)
- José Martínez-Lillo
- Departament de Química Inorgànica/Instituto de Ciencia Molecular (ICMol), Facultat de Química, Universitat de València, Avenida Dr. Moliner 50, 46100 Burjassot, València, Spain.
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Chen TR, Lee HP, Chen JD. Water Attack Umpolung Aromatic Systems To Release Hydrogen. Inorg Chem 2011; 50:3645-50. [DOI: 10.1021/ic1025944] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tsun-Ren Chen
- Department of Chemical Biology, National Pingtung University of Education, Pingtung, Taiwan 90003, Republic of China
| | - Hsiu-Pen Lee
- Department of Chemical Biology, National Pingtung University of Education, Pingtung, Taiwan 90003, Republic of China
| | - Jhy-Der Chen
- Department of Chemistry, Chung-Yuan Christian University, Chung-Li, Taiwan 32023, Republic of China
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Feng X, David Harris T, Long JR. Influence of structure on exchange strength and relaxation barrier in a series of FeIIReIV(CN)2 single-chain magnets. Chem Sci 2011. [DOI: 10.1039/c1sc00220a] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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Palii A, Tsukerblat B, Klokishner S, Dunbar KR, Clemente-Juan JM, Coronado E. Beyond the spin model: exchange coupling in molecular magnets with unquenched orbital angular momenta. Chem Soc Rev 2011; 40:3130-56. [DOI: 10.1039/c0cs00175a] [Citation(s) in RCA: 101] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Zadrozny JM, Freedman DE, Jenkins DM, Harris TD, Iavarone AT, Mathonière C, Clérac R, Long JR. Slow Magnetic Relaxation and Charge-Transfer in Cyano-Bridged Coordination Clusters Incorporating [Re(CN)7]3−/4−. Inorg Chem 2010; 49:8886-96. [DOI: 10.1021/ic101132z] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Joseph M. Zadrozny
- Department of Chemistry, University of California, Berkeley, California 94720
| | - Danna E. Freedman
- Department of Chemistry, University of California, Berkeley, California 94720
| | - David M. Jenkins
- Department of Chemistry, University of California, Berkeley, California 94720
- Department of Chemistry, University of Tennessee, Knoxville, Tennessee 37996
| | - T. David Harris
- Department of Chemistry, University of California, Berkeley, California 94720
| | - Anthony T. Iavarone
- Department of Chemistry, University of California, Berkeley, California 94720
- QB3/Chemistry Mass Spectrometry Facility, University of California, Berkeley, California 94720
| | - Corine Mathonière
- CNRS, Université de Bordeaux, Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), 87 avenue du Dr. Albert Schweitzer, Pessac, F-33605 Cedex, France
| | - Rodolphe Clérac
- CNRS, UPR 8641, Centre de Recherche Paul Pascal (CRPP), Equipe “Matériaux Moléculaires Magnétiques”, 115 avenue du Dr. Albert Schweitzer, Pessac, F-33600, France
- Université de Bordeaux, UPR 8641, Pessac, F-33600, France
| | - Jeffrey R. Long
- Department of Chemistry, University of California, Berkeley, California 94720
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Liu X, Speldrich M, Kögerler P, Dronskowski R, Tchougréeff AL. Synthesis, Characterization, and Quantum-Chemical Studies of Ni(CN) 2MX (M = Rb, Cs; X = Cl, Br). Inorg Chem 2010; 49:7414-23. [DOI: 10.1021/ic100599z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xiaohui Liu
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52056 Aachen, Germany
| | - Manfred Speldrich
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52056 Aachen, Germany
| | - Paul Kögerler
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52056 Aachen, Germany
| | - Richard Dronskowski
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52056 Aachen, Germany
| | - Andrei L. Tchougréeff
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52056 Aachen, Germany, and Poncelet Laboratory, Independent University of Moscow, Moscow Center for Continuous Mathematical Education, Bolshoi Vlasevsky Per. 11, 119002 Moscow, Russia
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Karadas F, Shatruk M, Perez L, Dunbar K. Cyanide-Bridged [CoII2MII] and [CoII2MII2] Complexes Based on the [CoII(triphos)(CN)2] Building Block: Syntheses, Structures, Magnetic Properties, and Density Functional Theoretical Studies. Chemistry 2010; 16:7164-73. [DOI: 10.1002/chem.201000128] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Freiherr von Richthofen CG, Stammler A, Bögge H, DeGroot MW, Long JR, Glaser T. Synthesis, structure, and magnetic characterization of a C3-symmetric Mn(III)3Cr(III) assembly: molecular recognition between a trinuclear Mn(III) triplesalen complex and a fac-triscyano Cr(III) complex. Inorg Chem 2010; 48:10165-76. [PMID: 19803531 DOI: 10.1021/ic901148q] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The reaction of the tris(tetradentate) triplesalen ligand H(6)talen(t-Bu(2)), which provides three salen-like coordination environments bridged in a meta-phenylene arrangement by a phloroglucinol backbone, with Mn(II) salts under aerobic conditions, affords, in situ, the trinuclear Mn(III) triplesalen complex [(talen(t-Bu(2))){Mn(III)(solv)(n)}(3)](3+). This species then reacts with [(Me(3)tacn)Cr(CN)(3)] to form the tetranuclear complex [{(talen(t-Bu(2)))Mn(III)(3)}{(Me(3)tacn)Cr(CN)(3)}](3+) ([Mn(III)(3)Cr(III)](3+)). The regular ligand folding observed in the trinuclear triplesalen complex preorganizes the three metal ions for the reaction with three facially coordinated nitrogen atoms of [(Me(3)tacn)Cr(CN)(3)]. [{(talen(t-Bu(2)))(Mn(III)(MeOH))(3)}{(Me(3)tacn)Cr(CN)(3)}](ClO(4))(3) (1) was characterized by infrared spectroscopy, elemental analysis, mass spectrometry, electron absorption spectroscopy, and magnetic measurements. The molecular structure was established for the acetate-substituted derivative [{(talen(t-Bu(2)))(Mn(III)(MeOH))(2)(Mn(III)(OAc))}{(Me(3)tacn)Cr(CN)(3)}](ClO(4))(2) (2) by single-crystal X-ray diffraction. Variable-temperature-variable-field and mu(eff) versus T magnetic data have been analyzed in detail by full-matrix diagonalization of the appropriate spin-Hamiltonian, consisting of isotropic exchange, zero-field splitting, and Zeeman interaction components. Satisfactory reproduction of the experimental data has been obtained for the parameters J(Mn-Cr) = -0.12 +/- 0.04 cm(-1), J(Mn-Mn) = -0.70 +/- 0.03 cm(-1), and D(Mn) = -3.0 +/- 0.4 cm(-1). These generate a triply degenerate pseudo S(t) = 7/2 spin manifold, which cannot be appropriately described by a giant spin model and which exhibits a weak easy-axis magnetic anisotropy. This is corroborated by the onset of a frequency-dependent chi'' signal at low temperatures, demonstrating a slow relaxation of the magnetization indicative of 1 being a single-molecule magnet. Comparing the properties to those of the heptanuclear analogue [{(talen(t-Bu(2)))Mn(III)(3)}(2){Cr(III)(CN)(6)}](3+) ([Mn(III)(6)Cr(III)](3+)) formed by the reaction of 2 equiv of [(talen(t-Bu(2))){Mn(III)(solv)(n)}(3)](3+) with 1 equiv of [Cr(CN)(6)](3-) [Glaser, T.; Heidemeier, M.; Weyhermüller, T.; Hoffmann, R.-D.; Rupp, H.; Müller, P. Angew. Chem. Int. Ed., 2006, 45, 6033-6037] demonstrates a lower driving force for formation, a strongly reduced J(Mn-Cr) exchange, a slightly reduced J(Mn-Mn) exchange, and a significantly longer Mn-N(N[triple bond]C) bond length in [Mn(III)(3)Cr(III)](3+). Taking into account magneto-structural correlations establishes a supramolecular interaction between the two [(talen(t-Bu(2)))Mn(III)(3)](3+) subunits in [Mn(III)(6)Cr(III)](3+) responsible for the structural distortion and the short Mn-N(N[triple bond]C) distance which results in a strong J(Mn-Cr) exchange and thus [Mn(III)(6)Cr(III)](3+) being a single-molecule magnet with a relatively high effective anisotropy barrier of 25.4 K.
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Palii A, Tsukerblat B, Clemente-Juan JM, Coronado E. Magnetic exchange between metal ions with unquenched orbital angular momenta: basic concepts and relevance to molecular magnetism. INT REV PHYS CHEM 2010. [DOI: 10.1080/01442350903435256] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Visinescu D, Toma LM, Cano J, Fabelo O, Ruiz-Pérez C, Labrador A, Lloret F, Julve M. Magnetic coupling in discrete cyano-bridged MnIII-FeIII motifs: Synthesis, crystal structure, magnetic properties and theoretical study. Dalton Trans 2010; 39:5028-38. [DOI: 10.1039/b926912f] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Comba P, Hausberg S, Martin B. Calculation of Exchange Coupling Constants of Transition Metal Complexes with DFT. J Phys Chem A 2009; 113:6751-5. [DOI: 10.1021/jp900752p] [Citation(s) in RCA: 67] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Peter Comba
- Universität Heidelberg, Anorganisch-Chemisches Institut, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Sascha Hausberg
- Universität Heidelberg, Anorganisch-Chemisches Institut, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
| | - Bodo Martin
- Universität Heidelberg, Anorganisch-Chemisches Institut, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
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Tregenna-Piggott PLW, Sheptyakov D, Keller L, Klokishner SI, Ostrovsky SM, Palii AV, Reu OS, Bendix J, Brock-Nannestad T, Pedersen K, Weihe H, Mutka H. Single-ion anisotropy and exchange interactions in the cyano-bridged trimers MnIII2MIII(CN)6 (MIII = Co, Cr, Fe) species incorporating [Mn(5-Brsalen)]+ units: an inelastic neutron scattering and magnetic susceptibility study. Inorg Chem 2009; 48:128-37. [PMID: 19035636 DOI: 10.1021/ic801727p] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The electronic structures of the compounds K[(5-Brsalen)(2)(H(2)O)(2)-Mn(2)M(III)(CN)(6)].2H(2)O (M(III) = Co(III), Cr(III), Fe(III)) have been determined by inelastic neutron scattering (INS) and magnetic susceptibility studies, revealing the manganese(III) single-ion anisotropy and exchange interactions that define the low-lying states of the Mn-M(III)-Mn trimeric units. Despite the presence of an antiferromagnetic intertrimer interaction, the experimental evidence supports the classification of both the Cr(III) and Fe(III) compounds as single-molecule magnets. The value of 17(2) cm(-1) established from AC susceptibility measurements for a spin-reversal barrier of K[(5-Brsalen)(2)(H(2)O)(2)-Mn(2)Cr(CN)(6)].2H(2)O may be readily rationalized in terms of the energy level diagram determined directly by INS. AC susceptibility measurements on samples of K[(5-Brsalen)(2)(H(2)O)(2)-Mn(2)Fe(CN)(6)].2H(2)O are contrary to those previously reported, exhibiting but the onset of peaks below temperatures of 1.8 K at oscillating frequencies in the range of 100-800 Hz. INS measurements reveal an anisotropic ferromagnetic manganese(III)-iron(III) exchange interaction, in accordance with theoretical expectations based on the unquenched orbital angular momentum of the [Fe(CN)(6)](3-) anion, giving rise to an M(s) approximately +/-9/2 ground state, isolated by approximately 11.5 cm(-1) from the higher-lying levels. The reported INS and magnetic data should now serve as a benchmark against which theoretical models that aim to inter-relate the electronic and molecular structure of molecular magnets should be tested.
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Affiliation(s)
- Philip L W Tregenna-Piggott
- Laboratory for Neutron Scattering, ETH Zurich and Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland.
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Tsukerblat B, Klokishner S, Palii A. Jahn–Teller Effect in Molecular Magnetism: An Overview. SPRINGER SERIES IN CHEMICAL PHYSICS 2009. [DOI: 10.1007/978-3-642-03432-9_18] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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Atanasov M, Comba P. The Effect of Jahn–Teller Coupling in Hexacyanometalates on the Magnetic Anisotropy in Cyanide-Bridged Single-Molecule Magnets. SPRINGER SERIES IN CHEMICAL PHYSICS 2009. [DOI: 10.1007/978-3-642-03432-9_19] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Atanasov M, Busche C, Comba P, El Hallak F, Martin B, Rajaraman G, van Slageren J, Wadepohl H. Trinuclear {M1}CN{M2}2 Complexes (M1 = CrIII, FeIII, CoIII; M2 = CuII, NiII, MnII). Are Single Molecule Magnets Predictable? Inorg Chem 2008; 47:8112-25. [DOI: 10.1021/ic800556c] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mihail Atanasov
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. Georgi Bontchev Str. Bl.11, 1113 Sofia, Bulgaria, Universität Heidelberg, Anorganisch-Chemisches Institut, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany, and 1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany
| | - Christoph Busche
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. Georgi Bontchev Str. Bl.11, 1113 Sofia, Bulgaria, Universität Heidelberg, Anorganisch-Chemisches Institut, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany, and 1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany
| | - Peter Comba
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. Georgi Bontchev Str. Bl.11, 1113 Sofia, Bulgaria, Universität Heidelberg, Anorganisch-Chemisches Institut, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany, and 1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany
| | - Fadi El Hallak
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. Georgi Bontchev Str. Bl.11, 1113 Sofia, Bulgaria, Universität Heidelberg, Anorganisch-Chemisches Institut, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany, and 1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany
| | - Bodo Martin
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. Georgi Bontchev Str. Bl.11, 1113 Sofia, Bulgaria, Universität Heidelberg, Anorganisch-Chemisches Institut, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany, and 1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany
| | - Gopalan Rajaraman
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. Georgi Bontchev Str. Bl.11, 1113 Sofia, Bulgaria, Universität Heidelberg, Anorganisch-Chemisches Institut, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany, and 1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany
| | - Joris van Slageren
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. Georgi Bontchev Str. Bl.11, 1113 Sofia, Bulgaria, Universität Heidelberg, Anorganisch-Chemisches Institut, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany, and 1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany
| | - Hubert Wadepohl
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. Georgi Bontchev Str. Bl.11, 1113 Sofia, Bulgaria, Universität Heidelberg, Anorganisch-Chemisches Institut, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany, and 1. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany
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Comba P, Kerscher M, Schiek W. Bispidine Coordination Chemistry. PROGRESS IN INORGANIC CHEMISTRY 2008. [DOI: 10.1002/9780470144428.ch9] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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Atanasov M, Comba P, Daul CA. Combined Ligand Field and Density Functional Theory Analysis of the Magnetic Anisotropy in Oligonuclear Complexes Based on FeIII−CN−MII Exchange-Coupled Pairs. Inorg Chem 2008; 47:2449-63. [DOI: 10.1021/ic701702x] [Citation(s) in RCA: 71] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mihail Atanasov
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. Georgi Bontchev Str. Bl.11, 1113 Sofia, Bulgaria, Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany, and Département de Chimie, Université de Fribourg, Ch. du Musée 9, CH-1700 Fribourg, Switzerland
| | - Peter Comba
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. Georgi Bontchev Str. Bl.11, 1113 Sofia, Bulgaria, Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany, and Département de Chimie, Université de Fribourg, Ch. du Musée 9, CH-1700 Fribourg, Switzerland
| | - Claude A. Daul
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. Georgi Bontchev Str. Bl.11, 1113 Sofia, Bulgaria, Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany, and Département de Chimie, Université de Fribourg, Ch. du Musée 9, CH-1700 Fribourg, Switzerland
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Smith ME, Flynn EL, Fox MA, Trottier A, Wrede E, Yufit DS, Howard JAK, Ronayne KL, Towrie M, Parker AW, Hartl F, Low PJ. Facile photoinduced charge separation through a cyanoacetylide bridge in a heterobimetallic Fe(ii)–Re(i) complex. Chem Commun (Camb) 2008:5845-7. [DOI: 10.1039/b811357b] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Atanasov M, Comba P, Daul CA, Hauser A. DFT-Based Studies on the Jahn−Teller Effect in 3d Hexacyanometalates with Orbitally Degenerate Ground States. J Phys Chem A 2007; 111:9145-63. [PMID: 17718456 DOI: 10.1021/jp0731912] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The topology of the ground-state potential energy surface of M(CN)(6) with orbitally degenerate (2)T(2g) (M = Ti(III) (t(2g)(1)), Fe(III) and Mn(II) (both low-spin t(2g)(5))) and (3)T(1g) ground states (M = V(III) (t(2g)(2)), Mn(III) and Cr(II) (both low-spin t(2g)(4))) has been studied with linear and quadratic Jahn-Teller coupling models in the five-dimensional space of the epsilon(g) and tau(2g) octahedral vibrations (Tg[symbol: see text](epsilon(g)+tau(2g)) Jahn-Teller coupling problem (T(g) = (2)T(2g), (3)T(1g))). A procedure is proposed to give access to all vibronic coupling parameters from geometry optimization with density functional theory (DFT) and the energies of a restricted number of Slater determinants, derived from electron replacements within the t(2g)(1,5) or t(2g)(2,4) ground-state electronic configurations. The results show that coupling to the tau(2g) bending mode is dominant and leads to a stabilization of D(3d) structures (absolute minima on the ground-state potential energy surface) for all complexes considered, except for [Ti(CN)(6)](3-), where the minimum is of D(4h) symmetry. The Jahn-Teller stabilization energies for the D3d minima are found to increase in the order of increasing CN-M pi back-donation (Ti(III) < V(III) < Mn(III) < Fe(III) < Mn(II) < Cr(II)). With the angular overlap model and bonding parameters derived from angular distortions, which correspond to the stable D(3d) minima, the effect of configuration interaction and spin-orbit coupling on the ground-state potential energy surface is explored. This approach is used to correlate Jahn-Teller distortion parameters with structures from X-ray diffraction data. Jahn-Teller coupling to trigonal modes is also used to reinterpret the anisotropy of magnetic susceptibilities and g tensors of [Fe(CN)(6)](3-), and the (3)T(1g) ground-state splitting of [Mn(CN)(6)](3-), deduced from near-IR spectra. The implications of the pseudo Jahn-Teller coupling due to t(2g)-e(g) orbital mixing via the trigonal modes (tau(2g)) and the effect of the dynamic Jahn-Teller coupling on the magnetic susceptibilities and g tensors of [Fe(CN)(6)](3-) are also addressed.
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Affiliation(s)
- Mihial Atanasov
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Acad. Georgi Bontchev Str. Bl.11, 1113 Sofia, Bulgaria.
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Riley KE, Merz KM. Assessment of Density Functional Theory Methods for the Computation of Heats of Formation and Ionization Potentials of Systems Containing Third Row Transition Metals. J Phys Chem A 2007; 111:6044-53. [PMID: 17571862 DOI: 10.1021/jp0705931] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The performance of several different density functional theory (DFT) methods, including GGA, hybrid-GGA, meta-GGA, and hybrid-meta-GGA methods, have been assessed in terms of their ability to accurately compute both heats of formation and ionization potentials of systems containing third row transition metals. Two different basis sets were used in this study: 6-31G** and TZVP. It is found that the triple-zeta quality TZVP basis set generally produces the best results for both heats of formation and ionization potentials. One important observation made in this study is that the inclusion of exact exchange terms in DFT methods generally results in more consistently accurate results for both heats of formation and ionization potentials of transition metal systems. In general, DFT methods do not yield good ionization potential results for systems containing titanium or zinc. For heats of formation, it is found that the hybrid-meta-GGA functional, TPSS1KCIS, yields the best overall results when combined with the TZVP basis set, while PBE1PBE (hybrid-GGA) gives the best results for the 6-31G** basis. The hybrid-GGA functional, B3LYP, is found to produce the lowest overall errors for ionization potentials when combined with both 6-31G** and TZVP.
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Affiliation(s)
- Kevin E Riley
- Quantum Theory Project, Department of Chemistry, The University of Florida, Gainesville, Florida, USA
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