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Gharu A, Vignesh KR. Theoretical exploration of single-molecule magnetic and single-molecule toroic behaviors in peroxide-bridged double-triangular {MII3LnIII3} (M = Ni, Cu and Zn; Ln = Gd, Tb and Dy) complexes. Dalton Trans 2024. [PMID: 39087311 DOI: 10.1039/d4dt01800a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/02/2024]
Abstract
Detailed state-of-the-art ab initio and density functional theory (DFT) calculations have been undertaken to understand both Single-Molecule Magnetic (SMM) and Single-Molecule Toroic (SMT) behaviors of fascinating 3d-4f {M3Ln3} triangular complexes having the molecular formula [MII3LnIII3(O2)L3(PyCO2)3](OH)2(ClO4)2·8H2O (with M = Zn; Ln = Dy (1), Tb (2) & Gd (3) and M = Cu; Ln = Dy (4), Tb (5) & Gd (6)) and [Ni3Ln3(H2O)3(mpko)9(O2)(NO3)3](ClO4)·3CH3OH·3CH3CN (Ln = Dy (7), Tb (8), and Gd (9)) [mpkoH = 1-(pyrazin-2-yl)ethanone oxime]. All these complexes possess a peroxide ligand that bridges the {LnIII3} triangle in a μ3-η3:η3 fashion and the oxygen atoms/oxime of co-ligands that connect each MII ion to the {LnIII3} triangle. Through our computational studies, we tried to find the key role of the peroxide bridge and how it affects the SMM and SMT behavior of these complexes. Primarily, ab initio Complete Active Space Self-Consistent Field (CASSCF) SINGLE_ANISO + RASSI-SO + POLY_ANISO calculations were performed on 1, 2, 4, 5, 7, and 8 to study the anisotropic behavior of each Ln(III) ion, to derive the magnetic relaxation mechanism and to calculate the LnIII-LnIII and CuII/NiII-LnIII magnetic coupling constants. DFT calculations were also performed to validate these exchange interactions (J) by computing the GdIII-GdIII and CuII/NiII-GdIII interactions in 3, 6, and 9. Our calculations explained the experimental magnetic relaxation processes and the magnetic exchange interactions for all the complexes, which also strongly imply that the peroxide bridge plays a role in the SMM behavior observed in these systems. On the other hand, this peroxide bridge does not support the SMT behavior. To investigate the effect of bridging ions in {M3Ln3} systems, we modeled a {ZnII3DyIII3} complex (1a) with a hydroxide ion replacing the bridged peroxide ion in complex 1 and considered a hydroxide-bridged {CoIII3DyIII3} complex (10) having the formula [Co3Dy3(OH)4(OOCCMe3)6(teaH)3(H2O)3](NO3)2·H2O. We discovered that as compared to the LoProp charges of the peroxide ion, the greater negative charges on the bridging hydroxide ion reduce quantum tunneling of magnetization (QTM) effects, enabling more desirable SMM characteristics and also leading to good SMT behavior.
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Affiliation(s)
- Amit Gharu
- Department of Chemical Sciences, IISER Mohali, Sector-81, Knowledge city, S.A.S. Nagar, Mohali-140306, Punjab, India.
| | - Kuduva R Vignesh
- Department of Chemical Sciences, IISER Mohali, Sector-81, Knowledge city, S.A.S. Nagar, Mohali-140306, Punjab, India.
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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.
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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
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Heras Ojea MJ, Wilson C, Cirera J, Oshio H, Ruiz E, Murrie M. Elucidating the exchange interactions in a {Gd IIICu II4} propellor. Dalton Trans 2023; 52:3203-3209. [PMID: 36799208 DOI: 10.1039/d2dt03901j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The multinucleating ligand 2,2'-(propane-1,3-diyldiimino)bis[2-(hydroxymethyl)-propane-1,3-diol] (bis-tris propane, H6L) is used in the design of a new family of 3d-4f complexes that display an unusual {LnCu4} four-blade propeller topology. We report the synthesis, structure and magnetic characterisation of [LnCu4(H4L)4](Cl)2(ClO4)·6CH3OH, where Ln = Gd (1), Tb (2), Dy (3), La (4). Previously we have used CH3COO- and NO3- as co-ligands with bis-tris propane, but here the use of Cl- and ClO4- leads to coordination of four {Cu(H4L)} units around the central Ln ion. A magneto-structural analysis reveals that the geometrical arrangement of the Cu(II) centres defined by the H4L2- ligands controls the magnetic communication between the different metal centres. DFT calculations performed on the isotropic (Gd) and diamagnetic (La) systems 1 and 4 help to unravel the intriguing exchange interactions.
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Affiliation(s)
| | - Claire Wilson
- School of Chemistry, University of Glasgow, University Avenue, Glasgow G12 8QQ, UK.
| | - Jordi Cirera
- Departament de Química Inorgànica i Orgànica and Institut de Recerca de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain
| | - Hiroki Oshio
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Rd., 116024 Dalian, China
| | - Eliseo Ruiz
- Departament de Química Inorgànica i Orgànica and Institut de Recerca de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain
| | - Mark Murrie
- School of Chemistry, University of Glasgow, University Avenue, Glasgow G12 8QQ, UK.
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Mixed-lanthanide clusters: A bridging approach that permits the design of molecular magnetic materials by introducing heavy lanthanides into the 3d-light lanthanide clusters without breaking structural integrity. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.116088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Xu X, Xu F. A Heniconuclear {Mn 21} Cluster-Based Coordination Polymer with Manganese(II) Linkers Showing High Proton Conductivity. Inorg Chem 2022; 61:16038-16044. [PMID: 36166315 DOI: 10.1021/acs.inorgchem.2c02441] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An unprecedented metal-linked cluster-based coordination polymer, composed of heniconuclear {Mn21} clusters and Mn(II) ions as the nodes and linkers, respectively, was self-assembled from a facile aqueous synthesis. The structural analysis reveals that the compound possesses a rare 3D 8-connected hex framework topology. Significantly, the compound demonstrates a high proton conductivity of 1.06 mS cm-1 at 373 K and 98% RH and exhibits a magnetocaloric effect with a magnetic entropy change of -9.94 J kg-1 K-1 at H = 80 kOe and T = 6.0 K.
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Affiliation(s)
- Xiongli Xu
- State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry & Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Feng Xu
- State Key Laboratory for Chemo/Biosensing and Chemometrics, College of Chemistry & Chemical Engineering, Hunan University, Changsha 410082, P. R. China
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Design of Molecular Magnetic Materials Based on a New Family of Mixed-Lanthanide Co-Ln Clusters by the Use of the 1,3-Bis[tris(hydroxymethyl)-methylamino]propane Ligand. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.115754] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Romanenko GV, Fokin SV, Chubakova ET, Tretyakov EV, Bogomyakov AS, Ovcharenko VI. STRUCTURAL FEATURES OF THE 12-NUCLEAR Cu(hfac)2 COMPLEX WITH SPIN-LABELED PYRAZOLE. J STRUCT CHEM+ 2021. [DOI: 10.1134/s0022476621120052] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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8
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Syntheses and magnetic properties of a series of discrete Ni(II)-Ln(III) heterometallic complexes based on 2,3-dichlorobenzoate and 2,2′-bipyridine. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115328] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Wang HS, Zhang K, Song Y, Pan ZQ. Recent advances in 3d-4f magnetic complexes with several types of non-carboxylate organic ligands. Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2021.120318] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Mondal A, Raizada M, Sahu PK, Konar S. A new family of Fe 4Ln 4 (Ln = Dy III, Gd III, Y III) wheel type complexes with ferromagnetic interaction, magnetocaloric effect and zero-field SMM behavior. Inorg Chem Front 2021. [DOI: 10.1039/d1qi00781e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Observation of ferromagnetic interactions and single molecule toroic (SMT) behavior in Fe4Ln4 wheel complexes.
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Affiliation(s)
- Arpan Mondal
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal-462066, MP, India
| | - Mukul Raizada
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal-462066, MP, India
| | - Pradip Kumar Sahu
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal-462066, MP, India
| | - Sanjit Konar
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal-462066, MP, India
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Two series of novel Ln2Mn and Ln6Mn2 (Ln = Gd/Tb) clusters: Synthesis, structures and magnetic properties. Polyhedron 2020. [DOI: 10.1016/j.poly.2020.114757] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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12
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Sarkar A, Dey S, Rajaraman G. Role of Coordination Number and Geometry in Controlling the Magnetic Anisotropy in Fe II , Co II , and Ni II Single-Ion Magnets. Chemistry 2020; 26:14036-14058. [PMID: 32729641 DOI: 10.1002/chem.202003211] [Citation(s) in RCA: 67] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Indexed: 12/22/2022]
Abstract
Since the last decade, the focus in the area of single-molecule magnets (SMMs) has been shifting constructively towards the development of single-ion magnets (SIMs) based on transition metals and lanthanides. Although ground-breaking results have been witnessed for DyIII -based SIMs, significant results have also been obtained for some mononuclear transition metal SIMs. Among others, studies based on CoII ion are very prominent as they often exhibit high magnetic anisotropy or zero-field splitting parameters and offer a large barrier height for magnetisation reversal. Although CoII possibly holds the record for having the largest number of zero-field SIMs known for any transition metal ion, controlling the magnetic anisotropy in these systems are is still a challenge. In addition to the modern spectroscopic techniques, theoretical studies, especially ab initio CASSCF/NEVPT2 approaches, have been used to uncover the electronic structure of various CoII SIMs. In this article, with some selected examples, the aim is to showcase how varying the coordination number from two to eight, and the geometry around the CoII centre alters the magnetic anisotropy. This offers some design principles for the experimentalists to target new generation SIMs based on the CoII ion. Additionally, some important FeII /FeIII and NiII complexes exhibiting large magnetic anisotropy and SIM properties are also discussed.
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Affiliation(s)
- Arup Sarkar
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, 400076, India
| | - Sourav Dey
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, 400076, India
| | - Gopalan Rajaraman
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, 400076, India
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Yin JJ, Chen C, Zhuang GL, Zheng J, Zheng XY, Shao F. Syntheses, structures and magnetic properties of novel tetrameric Ln 2Mn 2 and ring-like Ln 4Mn 4 clusters. NEW J CHEM 2020. [DOI: 10.1039/d0nj01517b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two series of heterometallic Ln–Mn clusters Ln2Mn2 and Ln4Mn4 were successfully synthesized in the presence of alcohol ligands, and the magnetic coupling interaction between metal ions were characterized by theoretical calculations.
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Affiliation(s)
- Jia-Jia Yin
- Institutes of Physical Science and Information Technology
- Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education
- Anhui University
- Hefei
- China
| | - Cheng Chen
- Institutes of Physical Science and Information Technology
- Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education
- Anhui University
- Hefei
- China
| | - Gui-Lin Zhuang
- College of Chemical Engineering
- Zhejiang University of Technology
- Hangzhou
- China
| | - Jun Zheng
- Institutes of Physical Science and Information Technology
- Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education
- Anhui University
- Hefei
- China
| | - Xiu-Ying Zheng
- Institutes of Physical Science and Information Technology
- Key Laboratory of Structure and Functional Regulation of Hybrid Materials of Ministry of Education
- Anhui University
- Hefei
- China
| | - Feng Shao
- Université Paris-Saclay
- CNRS
- Institut de chimie moléculaire et des matériaux d’Orsay
- Orsay
- France
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