1
|
Bazhina ES, Shmelev MA, Babeshkin KA, Efimov NN, Kiskin MA, Eremenko IL. Two families of Ln(III)-V(IV) compounds (Ln(III) = Eu, Tb, Dy, Ho) of different structural types mediated by Rb+ and Cs+ cations: Slow magnetic relaxation of Eu(III)- and Ho(III)-containing members. Polyhedron 2023. [DOI: 10.1016/j.poly.2023.116385] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
|
2
|
Luo S, Shen X, Gao P, Tu T, Sun X. Magneto-structural maps and bridged-ligand effect for dichloro-bridged dinuclear copper(ii) complexes: a theoretical perspective. RSC Adv 2023; 13:12430-12437. [PMID: 37091610 PMCID: PMC10116190 DOI: 10.1039/d3ra00585b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2023] [Accepted: 04/17/2023] [Indexed: 04/25/2023] Open
Abstract
Theoretical understanding of magneto-structural correlations in dichloro-bridged dicopper(ii) complexes can guide the design of magnetic materials having broad-scale applications. However, previous reports suggest these correlations are complicated and unclear. To clarify possible correlations, magnetic coupling constants (J calc) of variants of a representative {Cu-(μ-Cl)2-Cu} complex A were calculated through BS-DFT. The variation of the Cu-(μ-Cl)-Cu angle (α), Cu⋯Cu distance (R 0), and Cu-Cl-Cu-Cl dihedral angle (τ) followed by structural optimization and calculation of the magnetic coupling constant (J calc) revealed several trends. J calc increased linearly with R 0 and τ, and initially increased and then decreased with α. Further, bridging ligand effects on J calc for dicopper(ii) complexes were evaluated through BS-DFT; the results revealed that J calc increased with increasing ligand field strength (I- < Br- < Cl- < N3 - < F-). Furthermore, a linear relationship was found between the spin density of the bridging ligand and J calc.
Collapse
Affiliation(s)
- Shuchang Luo
- College of Chemical Engineering, Guizhou University of Engineering Science Bijie 551700 People's Republic of China
- The Coal Chemical Engineering, 2011 Collaborative Innovation Center of Guizhou Province Bijie 551700 People's Republic of China
- Guizhou Province Key Laboratory of Ecological Protection and Restoration of Typical Plateau Wetlands Bijie 551700 People's Republic of China
| | - Xianwei Shen
- College of Chemical Engineering, Guizhou University of Engineering Science Bijie 551700 People's Republic of China
- The Coal Chemical Engineering, 2011 Collaborative Innovation Center of Guizhou Province Bijie 551700 People's Republic of China
| | - Peng Gao
- College of Chemical Engineering, Guizhou University of Engineering Science Bijie 551700 People's Republic of China
- The Coal Chemical Engineering, 2011 Collaborative Innovation Center of Guizhou Province Bijie 551700 People's Republic of China
| | - Ting Tu
- College of Chemical Engineering, Guizhou University of Engineering Science Bijie 551700 People's Republic of China
- The Coal Chemical Engineering, 2011 Collaborative Innovation Center of Guizhou Province Bijie 551700 People's Republic of China
| | - Xiaoyuan Sun
- College of Chemical Engineering, Guizhou University of Engineering Science Bijie 551700 People's Republic of China
- The Coal Chemical Engineering, 2011 Collaborative Innovation Center of Guizhou Province Bijie 551700 People's Republic of China
| |
Collapse
|
3
|
Cu-Ln complexes involving non-symmetrical ligands able to introduce asymmetric centres in the vicinity of Ln ions. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.116015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
4
|
Gupta A, Kapurwan S, Prasad Bera S, Jyoti Mondal D, Shome S, Konar S. Heterometallic Hexanuclear [Cu 2 Ln 4 ] Complexes Showing Zero-field SMM Behaviour and Magnetocaloric Effect. Chem Asian J 2022; 17:e202200622. [PMID: 35726858 DOI: 10.1002/asia.202200622] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Indexed: 11/10/2022]
Abstract
Three heterometallic hexanuclear 3d-4f complexes bearing the formula [Cu2 (L)2 Ln4 (L)4 (o-van)2 ] [L=2-((E)-((2-hydroxyphenyl)imino]methyl)phenol; o-van=ortho-vanillin] (LnIII =GdIII (1), DyIII (2), and TbIII (3)) have been synthesized and characterized. DC magnetic susceptibility measurements reveal overall antiferromagnetic interactions in 1 and 3, whereas co-existence of ferro- as well as antiferromagnetic interactions were observed in 2. The magnetocaloric effect has been observed for 1 with an entropy change (-ΔSm ) of 22.3 J kg-1 K-1 at 3 K and 7 T. Zero-field single molecule magnet (SMM) behaviour has been observed for 2, where Raman relaxation and quantum tunneling of magnetization (QTM) played a role in magnetization relaxation. The Cu-O-Ln angle well explains the magnetic exchange coupling occurring in the complexes. BS-DFT calculation for the complexes provides an estimate of the exchange interactions between the paramagnetic centres. Ab initio calculations performed for complex 2 established a good correlation to the experimental relaxation dynamics.
Collapse
Affiliation(s)
- Arindam Gupta
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal Bhopal By-pass road, Bhauri, Madhya Pradesh, 462066, India
| | - Sandhya Kapurwan
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal Bhopal By-pass road, Bhauri, Madhya Pradesh, 462066, India
| | - Siba Prasad Bera
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal Bhopal By-pass road, Bhauri, Madhya Pradesh, 462066, India
| | - Dibya Jyoti Mondal
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal Bhopal By-pass road, Bhauri, Madhya Pradesh, 462066, India
| | - Shraoshee Shome
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal Bhopal By-pass road, Bhauri, Madhya Pradesh, 462066, India
| | - Sanjit Konar
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal Bhopal By-pass road, Bhauri, Madhya Pradesh, 462066, India
| |
Collapse
|
5
|
Roy S, Shukla P, Prakash Sahu P, Sun Y, Ahmed N, Chandra Sahoo S, Wang X, Kumar Singh S, Das S. Zero‐field Slow Magnetic Relaxation Behavior of Dy
2
in a Series of Dinuclear {Ln
2
} (Ln=Dy, Tb, Gd and Er) Complexes: A Combined Experimental and Theoretical Study. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202100983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Soumalya Roy
- Department of Basic Sciences, Chemistry Discipline Institute of Infrastructure Technology Research And Management Near Khokhra Circle, Maninagar East Ahmedabad 380026, Gujarat India
| | - Pooja Shukla
- Department of Basic Sciences, Chemistry Discipline Institute of Infrastructure Technology Research And Management Near Khokhra Circle, Maninagar East Ahmedabad 380026, Gujarat India
| | - Prem Prakash Sahu
- Department of Chemistry Indian Institute of Technology Hyderabad Kandi- 502285, Sangareddy Telangana India
| | - Yu‐Chen Sun
- State Key Laboratory of Coordination Chemistry Collaborative Innovation Center of Advanced Microstructures School of Chemistry and Chemical Engineering, Nanjing University Nanjing 210023 China
| | - Naushad Ahmed
- Department of Chemistry Indian Institute of Technology Hyderabad Kandi- 502285, Sangareddy Telangana India
| | | | - 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
| | - Saurabh Kumar Singh
- Department of Chemistry Indian Institute of Technology Hyderabad Kandi- 502285, Sangareddy Telangana India
| | - Sourav Das
- Department of Basic Sciences, Chemistry Discipline Institute of Infrastructure Technology Research And Management Near Khokhra Circle, Maninagar East Ahmedabad 380026, Gujarat India
| |
Collapse
|
6
|
Chakrabarty A, Ahmed N, Ali J, MOORTHY SHRUTI, Goura J, Singh SKK, Rogez G, Chandrasekhar V. Exchange-Driven Slow Relaxation of Magnetization in NiII2LnIII2 (LnIII = Y, Gd, Tb and Dy) Butterfly complexes: Experimental and Theoretical Studies. Dalton Trans 2022; 51:14721-14733. [DOI: 10.1039/d2dt00237j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The tetranuclear NiII2LnIII2 complexes, [{L′2{Ni(MeOH)(μ-OAc)}2(μ3-MeO)2Ln2}; LnIII = YIII (1), GdIII (2), TbIII (3), DyIII (4)] were prepared using a Schiff base ligand, H3L [H3L = 3-((2-hydroxy-3-methoxybenzylidene)amino)-2-(2-hydroxy-3-methoxyphenyl)-2,3-dihydroquinazolin-4(1H)-one, whereas {L′}3- is the...
Collapse
|
7
|
Swain A, Sen A, Rajaraman G. Are lanthanide-transition metal direct bonds a route to achieving new generation {3d-4f} SMMs? Dalton Trans 2021; 50:16099-16109. [PMID: 34647556 DOI: 10.1039/d1dt02256c] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Lanthanide based single-molecule magnets are gaining wide attention due to their potential applications in emerging technologies. One of the main challenges in this area is quenching quantum tunnelling of magnetisation (QTM), which often undercuts the magnetisation reversal barrier. Among the several strategies employed, enhancing exchange coupling has been studied in detail, with large exchanges resulting in stronger quenching of QTM effects. Lanthanides, however, suffer from weak exchanges offered by the deeply buried 4f orbitals and the numerous attempts to enhance the exchange coupling in the {3d-4f} pairs have not exceeded values larger than 30 cm-1. In this work, using a combination of DFT and the ab initio CASSCF/RASSI-SO method, we have explored lanthanide-transition metal direct bonds as a tool to quench QTM effects. In this direction, we have modelled [PyCp2LnMCp(CO)2] (Ln = Gd(III), Dy(III), and Er(III) and M = V(0), Mn(0), Co(0) and Fe(I) and here PyCp2 = [2,6-(CH2C5H3)2C5H3N]2- using [PyCp2DyFeCp(CO)2] as an example as reported by Nippe et al. (C. P. Burns, X. Yang, J. D. Wofford, N. S. Bhuvanesh, M. B. Hall and M. Nippe, Angew. Chem., Int. Ed. 2018, 57, 8144). Bonding analysis reveals a dative Ln-TM bond with a donation of π(V/Mndxy-π*CO) to 5dz2 (Gd) in the case of Gd-V and Gd-Mn and 4s(Co) to 5dxy/5dyz (Gd) for Gd-Co with the transition metal ion being found in the low-spin S = ½ configurations in all the cases. B3LYP/TZV (Gd;CSDZ) calculations on [PyCp2GdMCp(CO)2] yield JGd-V = -46.1 cm-1, JGd-Mn = -57.1 cm-1, JGd-Co = +55.3 cm-1, JGd-Fe+ = +13.9 cm-1, JGd-Vhs = -162.1 cm-1 and JGd-Mnhs = -343.9 cm-1 and unveiling record-high J values for {3d-4f} complexes. The mechanism of magnetic coupling is developed, which discloses the dominating presence of strong 3d-4f orbital overlaps in most of the cases studied, leading to antiferromagnetic exchange. When these overlaps are weaker and 3d to Gd(5dz2), charge transfer dominates, yielding a ferromagnetic coupling for the Gd-Co/Gd-Fe+ complexes. Calculations performed on the anisotropic Dy(III) and Er(III) complexes reveal that the ground state gzz axis lies along the Cp-Ln-Cp axis and the Ln-TM bonds, respectively. Thus the Ln-TM bond hinders the single-ion anisotropy of Dy(III) by offering equatorial ligation and lowering the mJ = ±½ state energy, and at the same time, helping in enhancing the axiality of Er(III). When strong {3d-4f} exchange couplings are introduced, record-high barrier heights as high as 229 cm-1 were accomplished. Furthermore, the exchange coupling annihilates the QTM effects and suggests the lanthanide-transition metal direct bond as a viable alternative to enhance exchange coupling to bring {3d-4f} complexes back in the race for high-blocking SMMs.
Collapse
Affiliation(s)
- Abinash Swain
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai - 400076, India.
| | - Asmita Sen
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai - 400076, India.
| | - Gopalan Rajaraman
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai - 400076, India.
| |
Collapse
|
8
|
Kotrle K, Nemec I, Moncol J, Čižmár E, Herchel R. 3d-4f magnetic exchange interactions and anisotropy in a series of heterobimetallic vanadium(IV)-lanthanide(III) Schiff base complexes. Dalton Trans 2021; 50:13883-13893. [PMID: 34523627 DOI: 10.1039/d1dt01944a] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
A series of heterobimetallic LnIII-VIV compounds [Ln(VO)L(NO3)3(H2O)] (Ln = Gd(1), Tb(2), Dy(3), and Er(4)) assembled by a Schiff base ligand (H2L = N,N'-bis(1-hydroxy-2-benzylidene-6-methoxy)-1,7-diamino-4-azaheptane) were prepared and studied with experimental and theoretical methods. The single-crystal X-ray analysis revealed the change of the coordination number from 10 found in 1-3 to 9 confirmed in 4. The DC magnetic data were fit with several Hamiltonians to extract the exchange and anisotropy parameters of complexes 1-4. This investigation of magnetic properties was carried out using both DFT and CASSCF theoretical calculations. It was found out that exchange interactions in 1, 3 and 4 are antiferromagnetic, while 2 has ferromagnetic exchange interactions. Moreover, the AC susceptibility measurements revealed the field-induced slow relaxation of magnetization in complexes 2 and 3 which is complicated by the presence of three relaxation channels. Nevertheless, these compounds belong to the first TbIII-VIV and DyIII-VIV single-molecule magnets in this class of compounds.
Collapse
Affiliation(s)
- Kamil Kotrle
- Department of Inorganic Chemistry, Faculty of Science, Palacký University, 17. listopadu 12, CZ-771 46 Olomouc, Czech Republic.
| | - Ivan Nemec
- Department of Inorganic Chemistry, Faculty of Science, Palacký University, 17. listopadu 12, CZ-771 46 Olomouc, Czech Republic.
| | - Jan Moncol
- Department of Inorganic Chemistry, Faculty of Chemical and Food Technology, Slovak University of Technology in Bratislava, Bratislava SK-81237, Slovakia
| | - Erik Čižmár
- Institute of Physics, Faculty of Science, P.J. Šafárik University in Košice, Park Angelinum 9, SK-041 54 Košice, Slovakia
| | - Radovan Herchel
- Department of Inorganic Chemistry, Faculty of Science, Palacký University, 17. listopadu 12, CZ-771 46 Olomouc, Czech Republic.
| |
Collapse
|
9
|
Singh MK. Probing the strong magnetic exchange behaviour of transition metal–radical complexes: a DFT case study. Dalton Trans 2020; 49:4539-4548. [DOI: 10.1039/d0dt00262c] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Alteration of the structural parameters of metal–radical complexes may pave the way forward for fine tuning the magnetic exchange coupling value as high as >−500 cm−1 – a much sought-after parameter in the area of SMMs.
Collapse
|
10
|
Craig GA, Velmurugan G, Wilson C, Valiente R, Rajaraman G, Murrie M. Magnetic Properties of a Family of [MnIII4LnIII4] Wheel Complexes: An Experimental and Theoretical Study. Inorg Chem 2019; 58:13815-13825. [DOI: 10.1021/acs.inorgchem.9b01592] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Gavin A. Craig
- WestCHEM, School of Chemistry, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - Gunasekaran Velmurugan
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, Maharashtra 400 076, India
| | - Claire Wilson
- WestCHEM, School of Chemistry, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - Rafael Valiente
- Física Aplicada, Facultad de Ciencias, Universidad de Cantabria-IDIVAL, Avda. Los Castros s/n, 39005 Santander, Spain
| | - Gopalan Rajaraman
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, Maharashtra 400 076, India
| | - Mark Murrie
- WestCHEM, School of Chemistry, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| |
Collapse
|
11
|
Vignesh KR, Martin RB, Miller G, Rajaraman G, Murray KS, Langley SK. {MnIII2LnIII2} (Ln = Gd, La or Y) butterfly complexes: Ferromagnetic exchange observed between bis-μ-alkoxo bridged manganese(III) ions. Polyhedron 2019. [DOI: 10.1016/j.poly.2019.05.061] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
12
|
Rajeshkumar T, Jose R, Remya PR, Rajaraman G. Theoretical Studies on Trinuclear {MnIII2GdIII} and Tetranuclear {MnIII2GdIII2} Clusters: Magnetic Exchange, Mechanism of Magnetic Coupling, Magnetocaloric Effect, and Magneto–Structural Correlations. Inorg Chem 2019; 58:11927-11940. [DOI: 10.1021/acs.inorgchem.9b01503] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Thayalan Rajeshkumar
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Reshma Jose
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Premaja R. Remya
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Gopalan Rajaraman
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| |
Collapse
|
13
|
Xu Y, Luo F, Zheng JM. Syntheses, Structures, and Magnetic Properties of a Series of Heterotri-, Tetra- and Pentanuclear Ln III⁻Co II Compounds. Polymers (Basel) 2019; 11:E196. [PMID: 30960180 PMCID: PMC6418803 DOI: 10.3390/polym11020196] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Revised: 12/29/2018] [Accepted: 01/08/2019] [Indexed: 12/18/2022] Open
Abstract
Three types of Ln(III)⁻Co(II) heterometallic compounds, LnCo₂(L1)₇(bipy)₂ (Ln = Pr-1, Eu-2, Sm-3, Gd-4, Tb-5, Dy-6) (L1 = 4-chlorobenzoate, bipy = 2,2'-bipyridine), Ln₂Co₂(L₂)10(bipy)₂ (Ln = Sm-7, Gd-8, Tb-9, Dy-10, Ho-11, Er-12, Yb-13), (L2 = 2,4-dichlorobenzoate, bipy = 2,2'-bipyridine, phen = 1,10-phenanthroline), and Ln₂Co₃(L1)12(bipy)₂ (Ln = Ho-14, Er-15, Yb-16), were synthesized under hydrothermal conditions and characterized by single crystal X-ray diffraction, IR spectroscopy and magnetic measurements. Structural analyses revealed that 14⁻16 take on a unique linear pentanuclear structural motif. Interestingly, the Ho-containing compound 14 exhibits magnetic relaxation behavior.
Collapse
Affiliation(s)
- Yun Xu
- Department of Chemistry, Nankai University, Tianjin 300071, China.
- College of Chemistry and Materials Science, HuaiBei Normal University, Huaibei 235000, China.
| | - Feng Luo
- Department of Chemistry, Nankai University, Tianjin 300071, China.
| | - Ji-Min Zheng
- Department of Chemistry, Nankai University, Tianjin 300071, China.
| |
Collapse
|
14
|
Ayabe T, Costes JP, Vendier L, Geist A, Takeda M, Takahashi M. Contribution of 155Gd Mössbauer data to the study of the magnetic interaction in heterodinuclear 3d–Gd (3d = Cu, Ni) coordination complexes. Dalton Trans 2019; 48:6872-6878. [DOI: 10.1039/c9dt01336a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The observed 155Gd Mössbauer isomer shifts of 3d–Gd complexes give an experimental proof for the participation of 5d Gd orbitals to the magnetic interaction in these 3d–Gd complexes.
Collapse
Affiliation(s)
- Takanari Ayabe
- Department of Chemistry
- Faculty of Science
- Toho University
- Chiba 274-8510
- Japan
| | | | | | - Andreas Geist
- Karlsruhe Institute of Technology (KIT)
- Institute for Nuclear Waste Disposal (INE)
- 76021 Karlsruhe
- Germany
| | - Masuo Takeda
- Department of Chemistry
- Faculty of Science
- Toho University
- Chiba 274-8510
- Japan
| | - Masashi Takahashi
- Department of Chemistry
- Faculty of Science
- Toho University
- Chiba 274-8510
- Japan
| |
Collapse
|
15
|
Costes JP, Novitchi G, Vieru V, Chibotaru LF, Duhayon C, Vendier L, Majoral JP, Wernsdorfer W. Effects of the Exchange Coupling on Dynamic Properties in a Series of CoGdCo Complexes. Inorg Chem 2018; 58:756-768. [DOI: 10.1021/acs.inorgchem.8b02921] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jean-Pierre Costes
- Laboratoire de Chimie de Coordination (LCC)-CNRS, Université de Toulouse, CNRS, 31077 Toulouse, France
| | - Ghenadie Novitchi
- Laboratoire National des Champs Magnétiques Intenses, UPR CNRS 3228, 25 rue des Martyrs, B.P. 166, 38042 Grenoble cedex 9, France
| | - Veacheslav Vieru
- Theory of Nanomaterials Group, Katolieke Universiteit Leuven, Celestijnenlaan 200F B-3001 Heverlee, Belgium
| | - Liviu F. Chibotaru
- Theory of Nanomaterials Group, Katolieke Universiteit Leuven, Celestijnenlaan 200F B-3001 Heverlee, Belgium
| | - Carine Duhayon
- Laboratoire de Chimie de Coordination (LCC)-CNRS, Université de Toulouse, CNRS, 31077 Toulouse, France
| | - Laure Vendier
- Laboratoire de Chimie de Coordination (LCC)-CNRS, Université de Toulouse, CNRS, 31077 Toulouse, France
| | - Jean-Pierre Majoral
- Laboratoire de Chimie de Coordination (LCC)-CNRS, Université de Toulouse, CNRS, 31077 Toulouse, France
| | - Wolfgang Wernsdorfer
- Institut Néel, UPR CNRS 2940, Université Grenoble-Alpes, B.P. 166, 38042 Grenoble cedex 9, France
- Physikalisches Institut and Institute of Nanotechnology, Karlsruhe Institute of Technology, Wolfgang-Gaede-Str. 1, 76131 Karlsruhe, Germany
| |
Collapse
|
16
|
Hänninen MM, Mota AJ, Sillanpää R, Dey S, Velmurugan G, Rajaraman G, Colacio E. Magneto-Structural Properties and Theoretical Studies of a Family of Simple Heterodinuclear Phenoxide/Alkoxide Bridged MnIIILnIII Complexes: On the Nature of the Magnetic Exchange and Magnetic Anisotropy. Inorg Chem 2018; 57:3683-3698. [DOI: 10.1021/acs.inorgchem.7b02917] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mikko M. Hänninen
- Department of Chemistry, University of Jyväskylä, P.O. Box
35, FIN-40014 Jyväskylä, Finland
| | - Antonio J. Mota
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, Avda. de Fuentenueva s/n, 18071 Granada, Spain
| | - Reijo Sillanpää
- Department of Chemistry, University of Jyväskylä, P.O. Box
35, FIN-40014 Jyväskylä, Finland
| | - Sourav Dey
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Gunasekaran Velmurugan
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Gopalan Rajaraman
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Enrique Colacio
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, Avda. de Fuentenueva s/n, 18071 Granada, Spain
| |
Collapse
|
17
|
Singh MK, Rajeshkumar T, Kumar R, Singh SK, Rajaraman G. Role of (1,3) {Cu-Cu} Interaction on the Magneto-Caloric Effect of Trinuclear {CuII-GdIII-CuII} Complexes: Combined DFT and Experimental Studies. Inorg Chem 2018; 57:1846-1858. [DOI: 10.1021/acs.inorgchem.7b02775] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mukesh Kumar Singh
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Thayalan Rajeshkumar
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Ravi Kumar
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Saurabh Kumar Singh
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Gopalan Rajaraman
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| |
Collapse
|
18
|
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.
Collapse
Affiliation(s)
- Tulika Gupta
- Department of Chemistry, IIT Powai, Mumbai-400076, India.
| | | |
Collapse
|
19
|
Chen WX, Zhou X, Gao YF, Liu QP, Zhuang GL. Synthesis, characterization, and properties of four lanthanide-based coordination polymers with mixed ligands of 4-((4′-carboxybenzyl)oxy)benzoic acid and oxalic acid. J COORD CHEM 2017. [DOI: 10.1080/00958972.2017.1327045] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Wen-Xian Chen
- Institute of Industrial Catalysis, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, P.R. China
| | - Xiang Zhou
- Institute of Industrial Catalysis, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, P.R. China
| | - Yi-Fen Gao
- Institute of Industrial Catalysis, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, P.R. China
| | - Qiu-Ping Liu
- Institute of Industrial Catalysis, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, P.R. China
| | - Gui-Lin Zhuang
- Institute of Industrial Catalysis, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, P.R. China
| |
Collapse
|
20
|
Vignesh KR, Langley SK, Murray KS, Rajaraman G. Quenching the Quantum Tunneling of Magnetization in Heterometallic Octanuclear {TM III4 Dy III4 } (TM=Co and Cr) Single-Molecule Magnets by Modification of the Bridging Ligands and Enhancing the Magnetic Exchange Coupling. Chemistry 2017; 23:1654-1666. [PMID: 27859837 DOI: 10.1002/chem.201604835] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Indexed: 02/03/2023]
Abstract
We report the synthesis, structural characterisation, magnetic properties and provide an ab initio analysis of the magnetic behaviour of two new heterometallic octanuclear coordination complexes containing CoIII and DyIII ions. Single-crystal X-ray diffraction studies revealed molecular formulae of [CoIII4 DyIII4 (μ-OH)4 (μ3 -OMe)4 {O2 CC(CH3 )3 }4 (tea)4 (H2 O)4 ]⋅4 H2 O (1) and [CoIII4 DyIII4 (μ-F)4 (μ3 -OH)4 (o-tol)8 (mdea)4 ]⋅ 3 H2 O⋅EtOH⋅MeOH (2; tea3- =triply deprotonated triethanolamine; mdea2- =doubly deprotonated N-methyldiethanolamine; o-tol=o-toluate), and both complexes display an identical metallic core topology. Furthermore, the theoretical, magnetic and SMM properties of the isostructural complex, [CrIII4 DyIII4 (μ-F4 )(μ3 -OMe)1.25 (μ3 -OH)2.75 (O2 CPh)8 (mdea)4 ] (3), are discussed and compared with a structurally similar complex, [CrIII4 DyIII4 (μ3 -OH)4 (μ-N3 )4 (mdea)4 (O2 CC(CH3 )3 )4 ] (4). DC and AC magnetic susceptibility data revealed single-molecule magnet (SMM) behaviour for 1-4. Each complex displays dynamic behaviour, highlighting the effect of ligand and transition metal ion replacement on SMM properties. Complexes 2, 3 and 4 exhibited slow magnetic relaxation with barrier heights (Ueff ) of 39.0, 55.0 and 10.4 cm-1 respectively. Complex 1, conversely, did not exhibit slow relaxation of magnetisation above 2 K. To probe the variance in the observed Ueff values, calculations by using CASSCF, RASSI-SO and POLY_ANISO routine were performed on these complexes to estimate the nature of the magnetic coupling and elucidate the mechanism of magnetic relaxation. Calculations gave values of JDy-Dy as -1.6, 1.6 and 2.8 cm-1 for complexes 1, 2 and 3, respectively, whereas the JDy-Cr interaction was estimated to be -1.8 cm-1 for complex 3. The developed mechanism for magnetic relaxation revealed that replacement of the hydroxide ion by fluoride quenched the quantum tunnelling of magnetisation (QTM) significantly, and led to improved SMM properties for complex 2 compared with 1. However, the tunnelling of magnetisation at low-lying excited states was still operational for 2, which led to low-temperature QTM relaxation. Replacement of the diamagnetic CoIII ions with paramagnetic CrIII led to CrIII ⋅⋅⋅DyIII coupling, which resulted in quenching of QTM at low temperatures for complexes 3 and 4. The best example was found if both CrIII and fluoride were present, as seen for complex 3, for which both factors additively quenched QTM and led to the observation of highly coercive magnetic hysteresis loops above 2 K. Herein, we propose a synthetic strategy to quench the QTM effects in lanthanide-based SMMs. Our strategy differs from existing methods, in which parameters such as magnetic coupling are difficult to control, and it is likely to have implications beyond the DyIII SMMs studied herein.
Collapse
Affiliation(s)
| | - Stuart K Langley
- School of Science and the Environment, Division of chemistry, Manchester Metropolitan University, Manchester, UK
| | - Keith S Murray
- School of Chemistry, Monash University Clayton, Victoria, 3800, Australia
| | - Gopalan Rajaraman
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, Maharashtra, 400076, India), Fax: (+91) 22-2576-7152
| |
Collapse
|
21
|
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.
Collapse
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
| |
Collapse
|
22
|
Jiang L, Liu B, Zhao HW, Tian JL, Liu X, Yan SP. Compartmental ligand approach for constructing 3d–4f heterometallic [CuII5LnIII2] clusters: synthesis and magnetostructural properties. CrystEngComm 2017. [DOI: 10.1039/c6ce02519f] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
|
23
|
Gupta T, Beg MF, Rajaraman G. Role of Single-Ion Anisotropy and Magnetic Exchange Interactions in Suppressing Zero-Field Tunnelling in {3d-4f} Single Molecule Magnets. Inorg Chem 2016; 55:11201-11215. [DOI: 10.1021/acs.inorgchem.6b01831] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tulika Gupta
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400076, India
| | - Mohammad Faizan Beg
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400076, India
| | - Gopalan Rajaraman
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400076, India
| |
Collapse
|
24
|
Zhou H, Chen C, Wu K, Liu Y, Shen X. Heterotrimetallic Cu
II
(L)–Ln
III
–M
III
(M = Cr, Fe; Ln = Pr, Nd, Sm, Gd) Complexes Ranging from 0D Clusters to 1D Chains and 2D Networks: Syntheses, Structures, and Magnetism. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600886] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Hongbo Zhou
- School of Chemistry and Chemical Engineering Jiangsu University 212013 Zhenjiang China
| | - Chao Chen
- School of Chemistry and Chemical Engineering Jiangsu University 212013 Zhenjiang China
| | - Kang Wu
- School of Chemistry and Chemical Engineering Jiangsu University 212013 Zhenjiang China
| | - Yashu Liu
- School of Environmental and Chemical Engineering Jiangsu University of Science and Technology 212003 Zhenjiang China
| | - Xiaoping Shen
- School of Chemistry and Chemical Engineering Jiangsu University 212013 Zhenjiang China
| |
Collapse
|
25
|
Aravena D, Neese F, Pantazis DA. Improved Segmented All-Electron Relativistically Contracted Basis Sets for the Lanthanides. J Chem Theory Comput 2016; 12:1148-56. [DOI: 10.1021/acs.jctc.5b01048] [Citation(s) in RCA: 63] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Daniel Aravena
- Max Planck Institut für Chemische Energiekonversion, Stifstr. 34-36, 45470 Mülheim an der Ruhr, Germany
- Facultad
de Química y Biología, Universidad de Santiago de Chile (USACH), Casilla 40, Correo 33, Santiago, Chile
| | - Frank Neese
- Max Planck Institut für Chemische Energiekonversion, Stifstr. 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Dimitrios A. Pantazis
- Max Planck Institut für Chemische Energiekonversion, Stifstr. 34-36, 45470 Mülheim an der Ruhr, Germany
| |
Collapse
|
26
|
Costes JP, Duhayon C, Mallet-Ladeira S, Shova S, Vendier L. Does the Sign of the Cu-Gd Magnetic Interaction Depend on the Number of Atoms in the Bridge? Chemistry 2016; 22:2171-2180. [DOI: 10.1002/chem.201504238] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Indexed: 11/09/2022]
Affiliation(s)
- Jean-Pierre Costes
- Laboratoire de Chimie de Coordination du CNRS; 205, route de Narbonne, BP 44099 31077 Toulouse Cedex 4 France
- Université de Toulouse; UPS, INPT; 31077 Toulouse Cedex 4 France
| | - Carine Duhayon
- Laboratoire de Chimie de Coordination du CNRS; 205, route de Narbonne, BP 44099 31077 Toulouse Cedex 4 France
- Université de Toulouse; UPS, INPT; 31077 Toulouse Cedex 4 France
| | - Sonia Mallet-Ladeira
- Laboratoire de Chimie de Coordination du CNRS; 205, route de Narbonne, BP 44099 31077 Toulouse Cedex 4 France
- Université de Toulouse; UPS, INPT; 31077 Toulouse Cedex 4 France
| | - Sergiu Shova
- Laboratoire de Chimie de Coordination du CNRS; 205, route de Narbonne, BP 44099 31077 Toulouse Cedex 4 France
- Université de Toulouse; UPS, INPT; 31077 Toulouse Cedex 4 France
- Department of Chemistry; Moldova State University; A. Mateevici Str. 60 2009 Chisinau Moldova
| | - Laure Vendier
- Laboratoire de Chimie de Coordination du CNRS; 205, route de Narbonne, BP 44099 31077 Toulouse Cedex 4 France
- Université de Toulouse; UPS, INPT; 31077 Toulouse Cedex 4 France
| |
Collapse
|
27
|
Verma KC, Kotnala RK. Defects-assisted ferromagnetism due to bound magnetic polarons in Ce into Fe, Co:ZnO nanoparticles and first-principle calculations. Phys Chem Chem Phys 2016; 18:5647-57. [DOI: 10.1039/c5cp06930k] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the DMS systems of Zn0.94Fe0.03Ce0.03O and Zn0.94Co0.03Ce0.03O, the Ce ions attribute lattice defects as well as enhance antiferromagnetic interactions, which have potential in novel spintronic applications.
Collapse
Affiliation(s)
- Kuldeep Chand Verma
- Centre of Advanced Study in Physics
- Department of Physics
- Panjab University
- Chandigarh 160 014
- India
| | - R. K. Kotnala
- CSIR-National Physical Laboratory
- New Delhi 110012
- India
| |
Collapse
|
28
|
Singh SK, Beg MF, Rajaraman G. Role of Magnetic Exchange Interactions in the Magnetization Relaxation of {3d-4f} Single-Molecule Magnets: A Theoretical Perspective. Chemistry 2015; 22:672-80. [DOI: 10.1002/chem.201503102] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Indexed: 11/08/2022]
|
29
|
Chen WX, Tan L, Liu QP, Qiang GR, Zhuang GL. The ionothermal synthesis, structure, and magnetism-structure relationship of two biphenyl tetracarboxylic acid-based metal-organic frameworks. Dalton Trans 2015; 43:16515-21. [PMID: 25260091 DOI: 10.1039/c4dt02042a] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two new metal-organic frameworks (1-2) were ionothermally obtained by the reaction of a biphenyltetracarboxylic sodium (Na4BPTC) ligand and M(OOCCH3)2 (M = Co(1) and Mn(2)). Crystal structure analysis reveals that 1 is a Co3Na6 unit-based three dimensional heterometallic MOF, while 2 exhibits a {Mn(COO)n} chain-based three-dimensional framework. Furthermore, the magnetic measurement shows that both of them have anti-ferromagnetic properties. A combination of Density Functional Theory (DFT) and Quantum Monte Carlo (QMC) simulation uncovers that in 2 the coupling parameters between two adjacent Mn(II) ions are J1 = -2.0 cm(-1) and J2 = -1.6 cm(-1), and the magnetism mainly originates from the propagation of Mn(II) ions by the super-exchange of carboxylates. Interestingly, the superexchange modes of J1 and J2 are different. Two spin nets of -/+/- dominate in the coupling for J1, while for J2 there are two spin nets of -/+/- and one spin net of +/-/+.
Collapse
Affiliation(s)
- Wen-Xian Chen
- Institute of Industrial Catalysis, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou, 310032, People's Republic of China.
| | | | | | | | | |
Collapse
|
30
|
Toward heterometallic single-molecule magnets: Synthetic strategy, structures and properties of 3d–4f discrete complexes. Coord Chem Rev 2015. [DOI: 10.1016/j.ccr.2014.10.004] [Citation(s) in RCA: 402] [Impact Index Per Article: 44.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
31
|
Rajeshkumar T, Annadata HV, Evangelisti M, Langley SK, Chilton NF, Murray KS, Rajaraman G. Theoretical Studies on Polynuclear {CuII5GdIIIn} Clusters (n = 4, 2): Towards Understanding Their Large Magnetocaloric Effect. Inorg Chem 2015; 54:1661-70. [DOI: 10.1021/ic502651w] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Thayalan Rajeshkumar
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumabi 400076, India
| | - Harshini V. Annadata
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumabi 400076, India
| | - Marco Evangelisti
- Instituto de Ciencia
de Materiales de Aragón and Departamento de Física de
la Materia Condensada, CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain
| | - Stuart K. Langley
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Nicholas F. Chilton
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
- School of Chemistry, The University of Manchester, Manchester M13 9PL, United Kingdom
| | - Keith S. Murray
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Gopalan Rajaraman
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumabi 400076, India
| |
Collapse
|
32
|
Singh MK, Yadav N, Rajaraman G. Record high magnetic exchange and magnetization blockade in Ln2@C79N (Ln = Gd(iii) and Dy(iii)) molecules: a theoretical perspective. Chem Commun (Camb) 2015; 51:17732-5. [DOI: 10.1039/c5cc06642e] [Citation(s) in RCA: 57] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Ln2@C79N EMFs are found to attain the largest magnetic coupling reported to date between Ln-radical paramagnetic centres. The obtained Ucal values are very large, and strong exchange likely to quench the QTM effects offers a great chance to obtain high blocking temperatures.
Collapse
Affiliation(s)
- Mukesh Kumar Singh
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai
- 400076-India
| | - Neeraj Yadav
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai
- 400076-India
| | - Gopalan Rajaraman
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai
- 400076-India
| |
Collapse
|
33
|
Romanova KA, Freidzon AY, Bagaturyants AA, Galyametdinov YG. Ab Initio Study of Energy Transfer Pathways in Dinuclear Lanthanide Complex of Europium(III) and Terbium(III) Ions. J Phys Chem A 2014; 118:11244-52. [DOI: 10.1021/jp509492e] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Ksenia A. Romanova
- Physical
and Colloid Chemistry Department, Kazan National Research Technological University, 420015 Kazan, Russia
| | | | - Alexander A. Bagaturyants
- Photochemistry
Center, Russian Academy of Sciences, 119421 Moscow, Russia
- Department
of Condensed Matter Physics, Moscow Engineering Physics Institute, National Research Nuclear University, 115409 Moscow, Russia
| | - Yury G. Galyametdinov
- Physical
and Colloid Chemistry Department, Kazan National Research Technological University, 420015 Kazan, Russia
- Kazan
E. K. Zavoisky Physical-Technical Institute, Russian Academy of Sciences, 420029 Kazan, Russia
| |
Collapse
|
34
|
Zhuang GL, Tan L, Chen WL, Bai JQ, Zhong X, Wang JG. Synthesis, properties, and magnetism–structure relationship of lanthanide-based metal–organic frameworks with (ethylenedithio)acetic acid. CrystEngComm 2014. [DOI: 10.1039/c4ce00573b] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
35
|
Gass IA, Tewary S, Rajaraman G, Asadi M, Lupton DW, Moubaraki B, Chastanet G, Létard JF, Murray KS. Solvate-Dependent Spin Crossover and Exchange in Cobalt(II) Oxazolidine Nitroxide Chelates. Inorg Chem 2014; 53:5055-66. [DOI: 10.1021/ic5001057] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Ian A. Gass
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
- School of Pharmacy
and Biomolecular Sciences, University of Brighton, Brighton BN2 4GJ, U.K
| | - Subrata Tewary
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Gopalan Rajaraman
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Mousa Asadi
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - David W. Lupton
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Boujemaa Moubaraki
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Guillaume Chastanet
- CNRS, Université de Bordeaux, ICMCB, 87 avenue du Dr. A. Schweitzer, 33608 Pessac, France
| | - Jean-Francois Létard
- CNRS, Université de Bordeaux, ICMCB, 87 avenue du Dr. A. Schweitzer, 33608 Pessac, France
| | - Keith S. Murray
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| |
Collapse
|
36
|
Upadhyay A, Rajpurohit J, Kumar Singh M, Dubey R, Srivastava AK, Kumar A, Rajaraman G, Shanmugam M. Hydroxo-bridged dimers of oxo-centered ruthenium(III) triangle: synthesis and spectroscopic and theoretical investigations. Chemistry 2014; 20:6061-70. [PMID: 24700566 DOI: 10.1002/chem.201304826] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Indexed: 11/10/2022]
Abstract
The homometallic hexameric ruthenium cluster of the formula [Ru(III)6(μ3-O)2(μ-OH)2((CH3)3CCO2)12(py)2] (1) (py = pyridine) is solved by single-crystal X-ray diffraction. Magnetic susceptibility measurements performed on 1 suggest that the antiferromagnetic interaction between the Ru(III) centers is dominant, and this is supported by theoretical studies. Theoretical calculations based on density functional methods yield eight different exchange interaction values for 1: J1 = -737.6, J2 = +63.4, J3 = -187.6, J4 = +124.4, J5 = -376.4, J6 = -601.2, J7 = -657.0, and J8 = -800.6 cm(-1). Among all the computed J values, six are found to be antiferromagnetic. Four exchange values (J1, J6, J7 and J8) are computed to be extremely strong, with J8, mediated through one μ-hydroxo and a carboxylate bridge, being by far the largest exchange obtained for any transition-metal cluster. The origin of these strong interactions is the orientation of the magnetic orbitals in the Ru(III) centers, and the computed J values are rationalized by using molecular orbital and natural bond order analysis. Detailed NMR studies ((1)H, (13)C, HSQC, NOESY, and TOCSY) of 1 (in CDCl3) confirm the existence of the solid-state structure in solution. The observation of sharp NMR peaks and spin-lattice time relaxation (T1 relaxation) experiments support the existence of strong intramolecular antiferromagnetic exchange interactions between the metal centers. A broad absorption peak around 600-1000 nm in the visible to near-IR region is a characteristic signature of an intracluster charge-transfer transition. Cyclic voltammetry experiments show that there are three reversible one-electron redox couples at -0.865, +0.186, and +1.159 V with respect to the Ag/AgCl reference electrode, which corresponds to two metal-based one-electron oxidations and one reduction process.
Collapse
Affiliation(s)
- Apoorva Upadhyay
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai, Maharashtra 400 076 (India), Fax: (+91) 22-2576-7152
| | | | | | | | | | | | | | | |
Collapse
|
37
|
Singh SK, Rajaraman G. Probing the Origin of Magnetic Anisotropy in a Dinuclear {MnIIICuII} Single-Molecule Magnet: The Role of Exchange Anisotropy. Chemistry 2014; 20:5214-8. [DOI: 10.1002/chem.201304357] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2013] [Revised: 02/27/2014] [Indexed: 11/07/2022]
|
38
|
Pedersen KS, Lorusso G, Morales JJ, Weyhermüller T, Piligkos S, Singh SK, Larsen D, Schau-Magnussen M, Rajaraman G, Evangelisti M, Bendix J. Fluoride-Bridged {GdIII3MIII2} (M=Cr, Fe, Ga) Molecular Magnetic Refrigerants. Angew Chem Int Ed Engl 2014; 53:2394-7. [DOI: 10.1002/anie.201308240] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2013] [Indexed: 11/07/2022]
|
39
|
Pedersen KS, Lorusso G, Morales JJ, Weyhermüller T, Piligkos S, Singh SK, Larsen D, Schau-Magnussen M, Rajaraman G, Evangelisti M, Bendix J. Fluoride-Bridged {GdIII3MIII2} (M=Cr, Fe, Ga) Molecular Magnetic Refrigerants. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201308240] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
40
|
Zhang Y, Yang Y, Jiang H. 3d–4f Magnetic Interaction with Density Functional Theory Plus U Approach: Local Coulomb Correlation and Exchange Pathways. J Phys Chem A 2013; 117:13194-204. [DOI: 10.1021/jp4103228] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Yachao Zhang
- Beijing
National Laboratory
of Molecular Sciences, State Key Laboratory of Rare Earth Materials
Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Yang Yang
- Beijing
National Laboratory
of Molecular Sciences, State Key Laboratory of Rare Earth Materials
Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Hong Jiang
- Beijing
National Laboratory
of Molecular Sciences, State Key Laboratory of Rare Earth Materials
Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| |
Collapse
|
41
|
Singh SK, Rajeshkumar T, Chandrasekhar V, Rajaraman G. Theoretical studies on {3d-Gd} and {3d-Gd-3d} complexes: Effect of metal substitution on the effective exchange interaction. Polyhedron 2013. [DOI: 10.1016/j.poly.2013.02.037] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
42
|
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.
Collapse
Affiliation(s)
- Saurabh Kumar Singh
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076 (India), Fax: +91-(0)22-2576-7152
| | | |
Collapse
|
43
|
Liu J, Lin W, Chen Y, Gómez‐Coca S, Aravena D, Ruiz E, Leng J, Tong M. Cu
II
Gd
III
Cryogenic Magnetic Refrigerants and Cu
8
Dy
9
Single‐Molecule Magnet Generated by In Situ Reactions of Picolinaldehyde and Acetylpyridine: Experimental and Theoretical Study. Chemistry 2013; 19:17567-77. [DOI: 10.1002/chem.201303275] [Citation(s) in RCA: 84] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2013] [Indexed: 11/06/2022]
Affiliation(s)
- Jun‐Liang Liu
- Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, State Key Laboratory of Optoelectronic, Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat‐Sen University, Guangzhou 510275 (P.R. China)
| | - Wei‐Quan Lin
- Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, State Key Laboratory of Optoelectronic, Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat‐Sen University, Guangzhou 510275 (P.R. China)
| | - Yan‐Cong Chen
- Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, State Key Laboratory of Optoelectronic, Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat‐Sen University, Guangzhou 510275 (P.R. China)
| | - Silvia Gómez‐Coca
- Departament de Química Inorgànica and Institut de Recerca de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 645, 08028 Barcelona (Spain)
| | - Daniel Aravena
- Departament de Química Inorgànica and Institut de Recerca de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 645, 08028 Barcelona (Spain)
| | - Eliseo Ruiz
- Departament de Química Inorgànica and Institut de Recerca de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 645, 08028 Barcelona (Spain)
| | - Ji‐Dong Leng
- Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, State Key Laboratory of Optoelectronic, Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat‐Sen University, Guangzhou 510275 (P.R. China)
| | - Ming‐Liang Tong
- Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, State Key Laboratory of Optoelectronic, Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat‐Sen University, Guangzhou 510275 (P.R. China)
| |
Collapse
|
44
|
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]
|
45
|
Ghosh S, Singh SK, Tewary S, Rajaraman G. Enhancing the double exchange interaction in a mixed valence {VIII–VII} pair: a theoretical perspective. Dalton Trans 2013; 42:16490-3. [DOI: 10.1039/c3dt51935j] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|