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Chantarangkul C, Patigo A, McMurtrie JC, Clérac R, Rouzières M, Gómez-Coca S, Ruiz E, Harding P, Harding DJ. Thermal Jahn-Teller Distortion Changes and Slow Relaxation of Magnetization in Mn(III) Schiff Base Complexes. Inorg Chem 2024; 63:12858-12869. [PMID: 38934463 DOI: 10.1021/acs.inorgchem.4c01317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/28/2024]
Abstract
The impact that the anion and alkyl group has on the electronic structures and magnetic properties of four mononuclear Mn(III) complexes is explored in [Mn(salEen-Br)2]Y (salEen-Br = 2-{[2-(ethylamino)ethylimino]methyl}-4-Br-phenol; Y = ClO4- 1 and BF4-·1/3CH2Cl2 2) and [Mn(salBzen-Br)2]Y (salBzen-Br = 2-{[2-(benzylamino)ethylimino]methyl}-4-Br-phenol; Y = ClO4- 3 and BF4- 4). X-ray structures of [Mn(salEen-Br)2]ClO4·0.45C6H14 1-hexane, [Mn(salEen-Br)2]BF4·0.33CH2Cl2·0.15C6H14 2-dcm-hexane, and 3-4 reveal that they crystallize in ambient conditions in the monoclinic P21/c space group. Lowering the temperature, 2-dcm-hexane uniquely exhibits a structural phase transition toward a monoclinic P21/n crystal structure determined at 100 K with the unit cell trebling in size. Remarkably, at room temperature, the axially elongated Jahn-Teller axis in 2-dcm-hexane is poorly defined but becomes clearer at low temperature after the phase transition. Magnetic susceptibility measurements of 1-4 reveal that only 3 and 4 show slow relaxation of magnetization with Δeff/kB = 27.9 and 20.7 K, implying that the benzyl group is important for observing single-molecule magnet (SMM) properties. Theoretical calculations demonstrate that the alkyl group subtly influences the orbital levels and therefore very likely the observed SMM properties.
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Affiliation(s)
- Chantalaksana Chantarangkul
- Functional Materials and Nanotechnology Centre of Excellence, Walailak University, Thasala, Nakhon Si Thammarat 80160, Thailand
| | - Apinya Patigo
- Functional Materials and Nanotechnology Centre of Excellence, Walailak University, Thasala, Nakhon Si Thammarat 80160, Thailand
| | - John C McMurtrie
- Queensland University of Technology (QUT), Brisbane, Queensland 4001, Australia
| | - Rodolphe Clérac
- University of Bordeaux, CNRS, CRPP, UMR 5031, F-33600 Pessac, France
| | - Mathieu Rouzières
- University of Bordeaux, CNRS, CRPP, UMR 5031, F-33600 Pessac, France
| | - Silvia Gómez-Coca
- Departament de Química Inorgànica i Orgànica, Institut de Recerca de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain
| | - Eliseo Ruiz
- Departament de Química Inorgànica i Orgànica, Institut de Recerca de Química Teòrica i Computacional, Universitat de Barcelona, Diagonal 645, 08028 Barcelona, Spain
| | - Phimphaka Harding
- School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand
| | - David J Harding
- School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand
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Pissas M, Ferentinos E, Kyritsis P, Sanakis Y. Field-Induced Slow Magnetization Relaxation of a Tetrahedral S=2 Fe IIS 4-Containing Complex. Chempluschem 2024:e202400109. [PMID: 38727531 DOI: 10.1002/cplu.202400109] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2024] [Revised: 05/08/2024] [Indexed: 06/09/2024]
Abstract
In the work described herein, the spin relaxation properties of the mononuclear tetrahedral S=2 [Fe{(SPiPr2)2N}2] complex (1) were studied by employing static and dynamic magnetic measurements at liquid helium temperatures. In the absence of an external direct current (DC) magnetic field, 1 exhibits fast magnetization relaxation. However, in the presence of external magnetic fields of a few kOe, slow relaxation is induced as monitored by alternating current (AC) magnetic susceptibility measurements up to 10 kHz, in the temperature range 2-5 K. Analysis of the temperature dependence of the corresponding relaxation time reveals contributions by Quantum Tunnelling of Magnetization, and the Direct and Orbach processes in the magnetization relaxation mechanism of 1. The energy barrier, Ueff, of the Orbach process, as determined by this analysis, is compared with that related to the zero-field splitting parameters of 1 which were previously determined by high- frequency and -field electron paramagnetic resonance and Mössbauer spectroscopies.
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Affiliation(s)
- Michael Pissas
- Institute of Nanoscience and Nanotechnology, NCSR Demokritos, 15341, Ag. Paraskevi, Attiki, Greece
| | - Eleftherios Ferentinos
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, 15571, Athens, Greece
| | - Panayotis Kyritsis
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, 15571, Athens, Greece
| | - Yiannis Sanakis
- Institute of Nanoscience and Nanotechnology, NCSR Demokritos, 15341, Ag. Paraskevi, Attiki, Greece
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Potočňák I, Bukrynov O, Kliuikov A, Holub M, Vitushkina S, Samoľová E, Čižmár E, Váhovská L. Influence of the phonon-bottleneck effect and low-energy vibrational modes on the slow spin-phonon relaxation in Kramers-ions-based Cu(II) and Co(II) complexes with 4-amino-3,5-bis-(pyridin-2-yl)-1,2,4-triazole and dicyanamide. Dalton Trans 2024; 53:6950-6964. [PMID: 38567872 DOI: 10.1039/d4dt00219a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/24/2024]
Abstract
Two new complexes, bis-[4-amino-3,5-bis-(pyridin-2-yl)-1,2,4-triazole-κ2N2,N6]bis-(dicyanamide-κN8)copper(II), [Cu(abpt)2(dca)2] (1) and bis-[4-amino-3,5-bis-(pyridin-2-yl)-1,2,4-triazole-κ2N2,N6]bis-(dicyanamide-κN8)cobalt(II), [Co(abpt)2(dca)2] (2), have been prepared and magneto-structurally characterised. Single crystal studies of both complexes have shown that their crystal structures are molecular, in which the central atoms are six-coordinated in the form of a distorted octahedron by two bidentate abpt and two monodentate dca ligands. Even if both complexes have the same composition and crystallize in the same P1̄ space group, they are not isostructural. Both structures contain strong intermolecular N-H⋯N hydrogen bonds and π-π stacking interactions. IR spectra are consistent with the solved structures of both complexes and confirmed the terminal character of the dca ligands and the bidentate coordination of the abpt ligands. The analysis of the magnetic properties showed that both complexes exhibit field-induced slow spin-phonon relaxation. In both complexes, the slow spin-phonon relaxation is influenced by a severe phonon-bottleneck effect that affects the direct process, a dominant relaxation mechanism at low temperatures in both complexes. The phonon-bottleneck effect in 1 was suppressed by simply reducing the crystallite size, and further analysis of the field dependence of the relaxation time yielded the characteristic energy of vibrational modes of 11 cm-1 participating in the Raman process at low magnetic fields. The analysis of magnetic properties and ab initio calculations confirmed that 2 represents a system with a moderate uniaxial anisotropy yielding an average energy barrier of 82 cm-1 (from all four nonequivalent Co(II) sites in the structure of 2).
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Affiliation(s)
- Ivan Potočňák
- P. J. Šafárik University in Košice, Faculty of Science, Institute of Chemistry, Department of Inorganic Chemistry, Moyzesova 11, SK-041 54 Košice, Slovakia
| | - Oleksandr Bukrynov
- V. N. Karazin Kharkiv National University, Faculty of Chemistry, Department of Applied Chemistry, Svobody sq. 4, UA-61022 Kharkiv, Ukraine
| | - Andrii Kliuikov
- P. J. Šafárik University in Košice, Faculty of Science, Institute of Physics, Park Angelinum 9, SK-041 54 Košice, Slovakia
- Slovak Metrological Institute, Karloveská 63, SK-842 55 Bratislava, Slovakia
| | - Mariia Holub
- P. J. Šafárik University in Košice, Faculty of Science, Institute of Physics, Park Angelinum 9, SK-041 54 Košice, Slovakia
- Synchrotron SOLEIL, L'Orme des Merisiers, Départementale 128, FR-91190 Saint-Aubin, France
| | - Svitlana Vitushkina
- V. N. Karazin Kharkiv National University, Faculty of Chemistry, Department of Applied Chemistry, Svobody sq. 4, UA-61022 Kharkiv, Ukraine
- Institute of Experimental Physics of the Slovak Academy of Sciences, Department of Materials Physics, Watsonova 47, SK-040 01 Košice, Slovakia
| | - Erika Samoľová
- Institute of Physics of the Czech Academy of Sciences, Na Slovance 2, CZ-182 21 Prague 8, Czech Republic
| | - Erik Čižmár
- P. J. Šafárik University in Košice, Faculty of Science, Institute of Physics, Park Angelinum 9, SK-041 54 Košice, Slovakia
| | - Lucia Váhovská
- University of Veterinary Medicine and Pharmacy in Košice, Department of Chemistry, Biochemistry and Biophysics, Komenského 73, SK-041 84 Košice, Slovakia.
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Li RX, Sun HY, Liang HC, Yi C, Yao NT, Meng YS, Xiong J, Liu T, Zhu YY. Slow magnetic relaxation in mononuclear octa-coordinate Fe(II) and Co(II) complexes from a Bpybox ligand. Dalton Trans 2022; 51:8865-8873. [PMID: 35635033 DOI: 10.1039/d2dt00865c] [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
Two 3d transition metal mononuclear complexes, [(FeL2)(ClO4)2]2·CH3CN (1) and (CoL2)(ClO4)2·2CH3CN (2), have been prepared from a rigid tetradentate bpybox (L = 6,6'-bis(2,5-dihydrooxazol-4-yl)-2,2'-bipyridine) ligand. Single crystal X-ray diffraction analyses together with the help of calculations show that both compounds are octa-coordinate. Direct current magnetic studies reveal their significant magnetic anisotropy. Impressively, field-induced relaxation of magnetism is observed in the two complexes and the apparent anisotropy barriers are 14.1 K for 1 and 21.6 K for 2, respectively. Theoretical calculations reveal that two Fe(II) centers in 1 have small negative D values of -4.897 and -4.825 cm-1 and relatively small E values of 0.646 and 0.830 cm-1, indicating a uniaxial magnetic anisotropy. In contrast, the D and E values in the Co(II) center of 2 are 46.42 cm-1 and 11.51 cm-1, featuring a rhombic anisotropy. This work demonstrates that field-induced slow magnetic relaxation in 3d transition metal complexes with high coordination numbers can be manipulated through rigid ligand design.
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Affiliation(s)
- Rui-Xia Li
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China.
| | - Hui-Ying Sun
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China.
| | - Hai-Chao Liang
- School of Chemistry and Chemical Engineering, Hefei University of Technology and Anhui Key Laboratory of Advanced Functional Materials and Devices, Hefei 230009, China.
| | - Cheng Yi
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China.
| | - Nian-Tao Yao
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China.
| | - Yin-Shan Meng
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China.
| | - Jin Xiong
- Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA 15213, USA.
| | - Tao Liu
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China.
| | - Yuan-Yuan Zhu
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, 2 Linggong Road, Dalian 116024, China. .,School of Chemistry and Chemical Engineering, Hefei University of Technology and Anhui Key Laboratory of Advanced Functional Materials and Devices, Hefei 230009, China.
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Nano K, Zahariou G, Ioannou PC, Alam MM, Pantazis DA, Raptopoulou CP, Psycharis V, Sanakis Y, Kyritsis P. Electronic properties of the S = 5/2 Mn(II) complexes [Mn{PhC(O)NP(O)PPh2}(N,N)(NO3)], (N,N) = phenanthroline, neocuproine, 2,2′-bipyridine. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Świtlicka A, Machura B, Cano J, Lloret F, Julve M. A Study of the Lack of Slow Magnetic Relaxation in Mononuclear Trigonal Bipyramidal Cobalt(II) Complexes. ChemistrySelect 2021. [DOI: 10.1002/slct.202100061] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Anna Świtlicka
- Department Of Crystallography, Institute of Chemistry University of Silesia 9th Szkolna St., 40–006 Katowice Poland
| | - Barbara Machura
- Department Of Crystallography, Institute of Chemistry University of Silesia 9th Szkolna St., 40–006 Katowice Poland
| | - Joan Cano
- Department of Química Inorgànica/Instituto de Ciencia Molecular (ICMol) Facultat de Quimica de la Universitat de València C/ Catedrático Jose Beltrán 2 46980 Paterna, València Spain
| | - Francesc Lloret
- Department of Química Inorgànica/Instituto de Ciencia Molecular (ICMol) Facultat de Quimica de la Universitat de València C/ Catedrático Jose Beltrán 2 46980 Paterna, València Spain
| | - Miguel Julve
- Department of Química Inorgànica/Instituto de Ciencia Molecular (ICMol) Facultat de Quimica de la Universitat de València C/ Catedrático Jose Beltrán 2 46980 Paterna, València Spain
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9
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Akiyoshi R, Ohtani R, Lindoy LF, Hayami S. Spin crossover phenomena in long chain alkylated complexes. Dalton Trans 2021; 50:5065-5079. [DOI: 10.1039/d1dt00004g] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This review presents a discussion of soft metal complexes with a focus on spin crossover behaviours that are associated with structural phase transition, including liquid crystal LC transition.
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Affiliation(s)
- Ryohei Akiyoshi
- Department of Chemistry
- Graduate School of Science and Technology
- Kumamoto University
- Kumamoto
- Japan
| | - Ryo Ohtani
- Department of Chemistry
- Faculty of Science
- Kyushu University
- Fukuoka 819-0395
- Japan
| | | | - Shinya Hayami
- Department of Chemistry
- Graduate School of Science and Technology
- Kumamoto University
- Kumamoto
- Japan
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10
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Banerjee A, Banerjee S, Gómez García CJ, Benmansour S, Chattopadhyay S. Field-induced single molecule magnet behavior of a dinuclear cobalt(II) complex: a combined experimental and theoretical study. Dalton Trans 2020; 49:16778-16790. [PMID: 33174540 DOI: 10.1039/d0dt02158j] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two dinuclear cobalt(ii) complexes, [(dmso)CoIIL1(μ-(m-NO2)C6H4COO)CoII(NCS)] (1) and [(dmso)CoIIL2(μ-(m-NO2)C6H4COO)CoII(NCS)] (2) [dmso = dimethylsulfoxide, H2L1 = (2,2-dimethyl-1,3-propanediyl)bis(iminomethylene)bis(6-methoxyphenol) and H2L2 = (2,2-dimethyl-1,3-propanediyl)bis(iminomethylene)bis(6-ethoxyphenol)] have been synthesized and structurally characterized by single-crystal X-ray diffraction, magnetic-susceptibility measurements and various spectroscopic techniques. Each complex contains a cobalt(ii) center with a slightly distorted octahedral geometry and a second cobalt(ii) center with a distorted trigonal prismatic one. To obtain insight into the physical nature of weak non-covalent interactions, we have extensively used the Bader's quantum theory of atoms-in-molecules (QTAIM). In addition, the non-covalent interaction reduced density gradient (NCI-RDG) methods established the presence of such non-covalent intermolecular interactions. Variable temperature magnetic susceptibility measurements show that both cobalt centers in each complex are in the high spin state (S = 3/2) and both complexes show weak ferromagnetic couplings through the double phenoxido bridges (J = 3.36(3) cm-1 in 1 and 4.56(2) cm-1 in 2). The magnetic properties of both complexes can be fitted to a Co(ii) dimer model including similar orbital reduction factors (α = -0.94(1) for 1 and -0.85(1) for 2) although different zero field splitting parameters D(1) = 11.0(4) cm-1 and D(2) = 19.5(4) cm-1 in 1 and D(1) = 8.2(4) cm-1 and D(2) = -1.3(4) cm-1 in 2. AC magnetic measurements reveal that the CoII2 unit in complex 2 exhibits field-induced slow relaxation of the magnetization at low temperatures and high frequencies.
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Affiliation(s)
- Abhisek Banerjee
- Department of Chemistry, Inorganic Section, Jadavpur University, Kolkata - 700032, India.
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11
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Pajuelo-Corral O, Zabala-Lekuona A, San Sebastian E, Rodríguez-Diéguez A, García JA, Lezama L, Colacio E, Seco JM, Cepeda J. Modulating Magnetic and Photoluminescence Properties in 2-Aminonicotinate-Based Bifunctional Coordination Polymers by Merging 3d Metal Ions. Chemistry 2020; 26:13484-13498. [PMID: 32668065 DOI: 10.1002/chem.202002755] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2020] [Revised: 07/13/2020] [Indexed: 12/23/2022]
Abstract
Herein, the synthesis and study of bifunctional coordination polymers (CPs) with both magnetic and photoluminescence properties, derived from a heterometallic environment, are reported. As a starting point, three isostructural monometallic CPs with the formula [M(μ-2ani)2 ]n (MII =Mn (1Mn ), Co (3Co ) and Ni (4Ni ); 2ani=2-aminonicotinate), crystallise as chiral 2D-layered structures stacked by means of supramolecular interactions. These compounds show high thermal stability in the solid state (above 350 °C), despite which, in aqueous solution, compound 1Mn is shown to partially transform into a novel 1D chain CP with the formula [Mn(2ani)2 (μ-H2 O)2 ]n (2Mn ). A study of the direct current (dc) magnetic properties of 1Mn , 3Co and 4Ni reveals a spin-canted structure derived from antisymmetric antiferromagnetic weak exchanges along the chiral network (as confirmed by DFT calculations) and magnetic anisotropy of the ions, in such a way that long-range ordering is observed with variable magnitude for the spin carriers. Moreover, compounds 3Co and 4Ni show no frequency-dependent alternating current (ac) susceptibility curves under zero dc field; this is characteristic behaviour of a glassy state that may be partially supressed for 3Co by applying an external dc field. To overcome long-range magnetic ordering, CoII ions are diluted in a diamagnetic ZnII -based matrix, which enables single-molecule magnet behaviour. Interestingly, this strategy allows a bifunctional Cox Zn1-x 2ani material, which is imbued with a strong photoluminescent emitting capacity, as characterised by an intense blue light followed by a green afterglow, to be obtained.
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Affiliation(s)
- Oier Pajuelo-Corral
- Departamento de Química Aplicada, Facultad de Química, Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU), 20018, Donostia, Spain
| | - Andoni Zabala-Lekuona
- Departamento de Química Aplicada, Facultad de Química, Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU), 20018, Donostia, Spain
| | - Eider San Sebastian
- Departamento de Química Aplicada, Facultad de Química, Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU), 20018, Donostia, Spain
| | - Antonio Rodríguez-Diéguez
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, 18071, Granada, Spain
| | - Jose Angel García
- Departamento de Física Aplicada II, Facultad de Ciencia y Tecnología, Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU), 48940, Leioa, Spain
| | - Luis Lezama
- Departamento de Química Inorgánica, Facultad de Ciencia y Tecnología, Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU), 48940, Leioa, Spain
| | - Enrique Colacio
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, 18071, Granada, Spain
| | - Jose M Seco
- Departamento de Química Aplicada, Facultad de Química, Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU), 20018, Donostia, Spain
| | - Javier Cepeda
- Departamento de Química Aplicada, Facultad de Química, Universidad del País Vasco/Euskal Herriko Unibertsitatea (UPV/EHU), 20018, Donostia, Spain
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12
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Viciano‐Chumillas M, Blondin G, Clémancey M, Krzystek J, Ozerov M, Armentano D, Schnegg A, Lohmiller T, Telser J, Lloret F, Cano J. Single‐Ion Magnetic Behaviour in an Iron(III) Porphyrin Complex: A Dichotomy Between High Spin and 5/2–3/2 Spin Admixture. Chemistry 2020; 26:14242-14251. [DOI: 10.1002/chem.202003052] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2020] [Indexed: 11/09/2022]
Affiliation(s)
| | - Geneviève Blondin
- CNRS, CEA, IRIG, CBM Université Grenoble Alpes, CEA-Grenoble 38000 Grenoble France
| | - Martin Clémancey
- CNRS, CEA, IRIG, CBM Université Grenoble Alpes, CEA-Grenoble 38000 Grenoble France
| | - Jurek Krzystek
- National High Magnetic Field Laboratory Florida State University Tallahassee FL 32310 USA
| | - Mykhaylo Ozerov
- National High Magnetic Field Laboratory Florida State University Tallahassee FL 32310 USA
| | - Donatella Armentano
- Dipartimento di Chimica e Tecnologie Chimiche (CTC) Università della Calabria 87030 Rende, Cosenza Italy
| | - Alexander Schnegg
- EPR Research Group MPI for Chemical Energy Conversion Stiftstrasse 34–36 45470 Mülheim Ruhr Germany
| | - Thomas Lohmiller
- EPR4Energy Joint Lab Department Spins in Energy Conversion and Quantum Information Science Helmholtz-Zentrum Berlin für Materialien und Energie Kekuléstrasse 5 12489 Berlin Germany
| | - Joshua Telser
- Department of Biological, Physical and Health Sciences Roosevelt University 430 S. Michigan Avenue Chicago IL 60605 USA
| | - Francesc Lloret
- Institut de Ciència Molecular (ICMol) Universitat de València 46980 Paterna Spain
| | - Joan Cano
- Institut de Ciència Molecular (ICMol) Universitat de València 46980 Paterna Spain
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13
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Sanakis Y, Krzystek J, Maganas D, Grigoropoulos A, Ferentinos E, Kostakis MG, Petroulea V, Pissas M, Thirunavukkuarasu K, Wernsdorfer W, Neese F, Kyritsis P. Magnetic Properties and Electronic Structure of the S = 2 Complex [Mn III{(OPPh 2) 2N} 3] Showing Field-Induced Slow Magnetization Relaxation. Inorg Chem 2020; 59:13281-13294. [PMID: 32897702 DOI: 10.1021/acs.inorgchem.0c01636] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The high-spin S = 2 Mn(III) complex [Mn{(OPPh2)2N}3] (1Mn) exhibits field-induced slow relaxation of magnetization (Inorg. Chem. 2013, 52, 12869). Magnetic susceptibility and dual-mode X-band electron paramagnetic resonance (EPR) studies revealed a negative value of the zero-field-splitting (zfs) parameter D. In order to explore the magnetic and electronic properties of 1Mn in detail, a combination of experimental and computational studies is presented herein. Alternating-current magnetometry on magnetically diluted samples (1Mn/1Ga) of 1Mn in the diamagnetic gallium analogue, [Ga{(OPPh2)2N}3], indicates that the slow relaxation behavior of 1Mn is due to the intrinsic properties of the individual molecules of 1Mn. Investigation of the single-crystal magnetization of both 1Mn and 1Mn/1Ga by a micro-SQUID device reveals hysteresis loops below 1 K. Closed hysteresis loops at a zero direct-current magnetic field are observed and attributed to fast quantum tunneling of magnetization. High-frequency and -field EPR (HFEPR) spectroscopic studies reveal that, apart from the second-order zfs terms (D and E), fourth-order terms (B4m) are required in order to appropriately describe the magnetic properties of 1Mn. These studies provide accurate spin-Hamiltonian (sH) parameters of 1Mn, i.e., zfs parameters |D| = 3.917(5) cm-1, |E| = 0.018(4) cm-1, B04 = B42 = 0, and B44 = (3.6 ± 1.7) × 10-3 cm-1 and g = [1.994(5), 1.996(4), 1.985(4)], and confirm the negative sign of D. Parallel-mode X-band EPR studies on 1Mn/1Ga and CH2Cl2 solutions of 1Mn probe the electronic-nuclear hyperfine interactions in the solid state and solution. The electronic structure of 1Mn is investigated by quantum-chemical calculations by employing recently developed computational protocols that are grounded on ab initio wave function theory. From computational analysis, the contributions of spin-spin and spin-orbit coupling to the magnitude of D are obtained. The calculations provide also computed values of the fourth-order zfs terms B4m, as well as those of the g and hyperfine interaction tensor components. In all cases, a very good agreement between the computed and experimentally determined sH parameters is observed. The magnetization relaxation properties of 1Mn are rationalized on the basis of the composition of the ground-state wave functions in the absence or presence of an external magnetic field.
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Affiliation(s)
- Yiannis Sanakis
- Institute of Nanoscience and Nanotechnolgy, National Centre of Scientific Research "Demokritos", Aghia Paraskevi 15310, Attiki, Greece
| | - J Krzystek
- National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32310, United States
| | - Dimitrios Maganas
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Alexios Grigoropoulos
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, 15771 Athens, Greece
| | - Eleftherios Ferentinos
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, 15771 Athens, Greece
| | - Marios G Kostakis
- Analytical Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens,15771 Athens, Greece
| | - Vasiliki Petroulea
- Institute of Nanoscience and Nanotechnolgy, National Centre of Scientific Research "Demokritos", Aghia Paraskevi 15310, Attiki, Greece
| | - Michael Pissas
- Institute of Nanoscience and Nanotechnolgy, National Centre of Scientific Research "Demokritos", Aghia Paraskevi 15310, Attiki, Greece
| | | | - Wolfgang Wernsdorfer
- Physikalisches Institut, Karlsruher Institut für Technologie, Wolfgang-Gaede-Strasse 1, 76131 Karlsruhe, Germany.,Institute of Quantum Materials and Technologies, Karlsruher Institut für Technologie, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Frank Neese
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | - Panayotis Kyritsis
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens, 15771 Athens, Greece
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14
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Paul A, Viciano-Chumillas M, Puschmann H, Cano J, Manna SC. Field-induced slow magnetic relaxation in mixed valence di- and tri-nuclear Co II-Co III complexes. Dalton Trans 2020; 49:9516-9528. [PMID: 32608402 DOI: 10.1039/d0dt00588f] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two novel mixed valence CoII-CoIII complexes, namely [CoIICoIII(L1)(ab)(mb)2(H2O)]·dmf (1) and [CoCoII(L2)4(H2O)4]·2H2O (2) [H2L1 = (E)-2-((1-hydroxybutan-2-ylimino)methyl)-6-methoxyphenol, ab = 2-amino-butan-1-ol anion, mb = p-methyl benzoate, H2L2 = 3-((2-hydroxy-3-methoxy-benzylidene)-amino)-propionic acid, and dmf = N,N-dimethyl-formamide], were synthesized and characterized by single crystal X-ray diffraction and magnetic studies at low temperature. The structure determination reveals that both complexes belong to the monoclinic system with P21/c (1) and I2/a (2) space groups. Complex 1 is a dinuclear CoIIICoII compound with distorted octahedral cobalt centers showing different coordination environments. In 2, a bent trinuclear CoCoII complex, the coordination environments around the two terminal CoIII sites are alike, whereas they are different in the central CoII ion. Alternating current/direct current (ac/dc) magnetic studies revealed that both complexes show field-induced slow magnetic relaxation. The dc magnetic susceptibility and magnetization data were analyzed with the following Hamiltonianwhere D and E are the axial and rhombic zero-field splitting (zfs) parameters, respectively, and a good agreement between experimental and simulated results was found using the parameters g⊥ = 2.585, g∥ = 2.437, D = +98.1 cm-1, E/D = 0.008 and F = 8.2× 10-5 for 1 and g⊥ = 2.580, g∥ = 2.580, D = +55.4 cm-1, and E/D = 0.000 for 2.
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Affiliation(s)
- Aparup Paul
- Department of Chemistry, Vidyasagar University, Midnapore 721102, West Bengal, India.
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15
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Doistau B, Benda L, Cantin JL, Cador O, Pointillart F, Wernsdorfer W, Chamoreau LM, Marvaud V, Hasenknopf B, Vives G. Dual switchable molecular tweezers incorporating anisotropic Mn III-salphen complexes. Dalton Trans 2020; 49:8872-8882. [PMID: 32530022 DOI: 10.1039/d0dt01465f] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
An alternative strategy for the synthesis of terpyridine based switchable molecular tweezers has been developed to incorporate anisotropic Mn(iii)-salphen complexes. The free ligand was synthesized using a building block strategy based on Sonogashira coupling reactions and was then selectively metalated with manganese in a last step. The conformation of the tweezers was switched from an open 'W' shaped form to a closed 'U' form by Zn(ii) coordination to the terpyridine unit bringing the two Mn-salphen moieties in close spatial proximity as confirmed by X-ray crystallography. An alternate switching mechanism was observed by the intercalation of a bridging cyanide ligand between the two Mn-salphen moieties that resulted in the closing of the tweezers. These dual stimuli are attractive for achieving multiple controls of the mechanical motion of the tweezers. A crystallographic structure of unexpected partially oxidized closed tweezers was also obtained. One of the two Mn-salphen moieties underwent a ligand-centered oxidation of an imino to an amido group allowing an intramolecular Mn-Oamide-Mn linkage. The magnetic properties of the manganese(iii) dimers were investigated to evaluate the magnetic exchange interaction and analyze the single molecule magnet behavior.
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Affiliation(s)
- Benjamin Doistau
- Sorbonne Université, UMR CNRS 8232, Institut Parisien de Chimie Moléculaire, 4 place Jussieu, 75005, Paris, France.
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16
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Azido-cobalt(II) coordination polymers exhibiting slow magnetic relaxation and metamagnetic transition. Polyhedron 2019. [DOI: 10.1016/j.poly.2019.06.034] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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17
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Kobayashi F, Ohtani R, Nakamura M, Lindoy LF, Hayami S. Slow Magnetic Relaxation Triggered by a Structural Phase Transition in Long-Chain-Alkylated Cobalt(II) Single-Ion Magnets. Inorg Chem 2019; 58:7409-7415. [PMID: 31117627 DOI: 10.1021/acs.inorgchem.9b00543] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The behavior of single-ion magnets (SIMs) that reflects large distortions of their coordination environments caused by the packing of long alkyl chains for two Co(II) complexes of the type [Co(C n-terpy)2](BF4)2 (C n-terpy = 4'-alkoxy-2,2':6',2″-terpyridine; n = 10 (1), 16 (2)) is reported. 1·2MeOH, which features a highly distorted octahedral high-spin Co(II) center, exhibits field-induced slow magnetic relaxation under an applied dc field of 1000 Oe. Further detailed analysis of the relaxation process indicated the prevalence of the Raman process at low temperature. Surprisingly, 2 shows a reverse spin transition (rST) and also exhibits remarkable field-induced SIM behavior, revealing the presence of magnetic anisotropy for this high-spin Co(II) species that is triggered by a structural phase transition. We present here the first examples of the coexistence of field-induced slow magnetic relaxation and rST associated with structural phase transitions involving long-alkyl-chain conformational changes from gauche to anti. These results indicate the prospect of inducing SIM properties in other distorted high-spin Co(II) species bearing long alkyl chains.
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Affiliation(s)
- Fumiya Kobayashi
- Department of Chemistry, Graduate School of Science and Technology , Kumamoto University , 2-39-1 Kurokami , Chuo-ku, Kumamoto 860-8555 , Japan
| | - Ryo Ohtani
- Department of Chemistry, Graduate School of Science and Technology , Kumamoto University , 2-39-1 Kurokami , Chuo-ku, Kumamoto 860-8555 , Japan
| | - Masaaki Nakamura
- Department of Chemistry, Graduate School of Science and Technology , Kumamoto University , 2-39-1 Kurokami , Chuo-ku, Kumamoto 860-8555 , Japan
| | - Leonard F Lindoy
- School of Chemistry , The University of Sydney , Sydney , New South Wales 2006 , Australia
| | - Shinya Hayami
- Department of Chemistry, Graduate School of Science and Technology , Kumamoto University , 2-39-1 Kurokami , Chuo-ku, Kumamoto 860-8555 , Japan.,Institute of Pulsed Power Science (IPPS) , Kumamoto University , 2-39-1 Kurokami , Chuo-ku, Kumamoto 860-8555 , Japan
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18
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Fetoh A, Cosquer G, Morimoto M, Irie M, El-Gammal O, Abu El-Reash GM, Breedlove BK, Yamashita M. Synthesis, Structures, and Magnetic Properties of Two Coordination Assemblies of Mn(III) Single Molecule Magnets Bridged via Photochromic Diarylethene Ligands. Inorg Chem 2019; 58:2307-2314. [DOI: 10.1021/acs.inorgchem.8b02578] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ahmed Fetoh
- Department of Chemistry, Faculty of Science, Mansoura University, Mansoura, Egypt
| | - Goulven Cosquer
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-ku, Sendai 980-8578, Japan
| | - Masakazu Morimoto
- Department of Chemistry and Research Center for Smart Molecules, Rikkyo University, Nishi-Ikebukuro 3-34-1, Toshima-ku, Tokyo, Japan
| | - Masahiro Irie
- Department of Chemistry and Research Center for Smart Molecules, Rikkyo University, Nishi-Ikebukuro 3-34-1, Toshima-ku, Tokyo, Japan
| | - Ola El-Gammal
- Department of Chemistry, Faculty of Science, Mansoura University, Mansoura, Egypt
| | | | - Brian K. Breedlove
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-ku, Sendai 980-8578, Japan
| | - Masahiro Yamashita
- Department of Chemistry, Graduate School of Science, Tohoku University, 6-3 Aramaki-Aza-Aoba, Aoba-ku, Sendai 980-8578, Japan
- WPI, Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-Ku, Sendai 980-8577, Japan
- School of Materials Science and Engineering, Nankai University, Tianjin 300350, China
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19
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Ferentinos E, Xu M, Grigoropoulos A, Bratsos I, Raptopoulou CP, Psycharis V, Jiang SD, Kyritsis P. Field-induced slow relaxation of magnetization in the S = 3/2 octahedral complexes trans-[Co{(OPPh 2)(EPPh 2)N} 2(dmf) 2], E = S, Se: effects of Co–Se vs. Co–S coordination. Inorg Chem Front 2019. [DOI: 10.1039/c9qi00135b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Magnetometry studies on octahedral trans-[Co{(OPPh2)(EPPh2)N}2(dmf)2], E = S, Se, complexes.
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Affiliation(s)
- Eleftherios Ferentinos
- Inorganic Chemistry Laboratory
- Department of Chemistry
- National and Kapodistrian University of Athens
- GR-15771 Athens
- Greece
| | - Meixing Xu
- College of Chemistry and Molecular Engineering
- Beijing National Laboratory for Molecular Sciences
- Beijing Key Laboratory of Magnetoelectric Materials and Devices
- Peking University
- Beijing 100871
| | - Alexios Grigoropoulos
- Inorganic Chemistry Laboratory
- Department of Chemistry
- National and Kapodistrian University of Athens
- GR-15771 Athens
- Greece
| | - Ioannis Bratsos
- NCSR “Demokritos”
- Institute of Nanoscience and Nanotechnology
- Athens
- Greece
| | | | - Vassilis Psycharis
- NCSR “Demokritos”
- Institute of Nanoscience and Nanotechnology
- Athens
- Greece
| | - Shang-Da Jiang
- College of Chemistry and Molecular Engineering
- Beijing National Laboratory for Molecular Sciences
- Beijing Key Laboratory of Magnetoelectric Materials and Devices
- Peking University
- Beijing 100871
| | - Panayotis Kyritsis
- Inorganic Chemistry Laboratory
- Department of Chemistry
- National and Kapodistrian University of Athens
- GR-15771 Athens
- Greece
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20
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Lecourt C, Madanamoothoo W, Ferreol V, Bélanger-Desmarais N, Khrouz L, Tommasino JB, Reber C, Desroches C, Luneau D. Mononuclear manganese(iii) complexes with reduced imino nitroxide radicals by single-electron transfer and intermolecular hydrogen bonds as an intramolecular structural driving force. Dalton Trans 2019; 48:13378-13387. [DOI: 10.1039/c9dt02158b] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
One-electron transfer from Mn(ii) ions to an imino nitroxide radical gives mononuclear Mn(iii) complexes of the reduced amino imine-oxide form for which crystal structures evidence hydrogen bonds networks acting as a stabilizing driving-force.
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Affiliation(s)
- Constance Lecourt
- Univ Lyon
- Université Claude Bernard Lyon 1
- CNRS
- Laboratoire des Multimatériaux et Interfaces
- F-69622 Villeurbanne
| | - Warren Madanamoothoo
- Univ Lyon
- Université Claude Bernard Lyon 1
- CNRS
- Laboratoire des Multimatériaux et Interfaces
- F-69622 Villeurbanne
| | - Vivian Ferreol
- Univ Lyon
- Université Claude Bernard Lyon 1
- CNRS
- Laboratoire des Multimatériaux et Interfaces
- F-69622 Villeurbanne
| | | | - Lhoussain Khrouz
- Univ Lyon
- ENS de Lyon
- CNRS UMR 5182
- Université Claude Bernard Lyon 1
- Laboratoire de Chimie
| | - Jean-Bernard Tommasino
- Univ Lyon
- Université Claude Bernard Lyon 1
- CNRS
- Laboratoire des Multimatériaux et Interfaces
- F-69622 Villeurbanne
| | | | - Cédric Desroches
- Univ Lyon
- Université Claude Bernard Lyon 1
- CNRS
- Laboratoire des Multimatériaux et Interfaces
- F-69622 Villeurbanne
| | - Dominique Luneau
- Univ Lyon
- Université Claude Bernard Lyon 1
- CNRS
- Laboratoire des Multimatériaux et Interfaces
- F-69622 Villeurbanne
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21
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Chen L, Song J, Zhao W, Yi G, Zhou Z, Yuan A, Song Y, Wang Z, Ouyang ZW. A mononuclear five-coordinate Co(ii) single molecule magnet with a spin crossover between the S = 1/2 and 3/2 states. Dalton Trans 2018; 47:16596-16602. [PMID: 30417917 DOI: 10.1039/c8dt03783c] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Although a great number of single-ion magnets (SIMs) and spin-crossover (SCO) compounds have been discovered, multifunctional materials with the combination of SCO and SIM properties are extremely scarce. Here magnetic studies have been carried out for a mononuclear, five-coordinate cobalt(ii) complex [Co(3,4-lut)4Br]Br (1) with square pyramidal geometry. Direct-current magnetic measurement confirms the spin transition between the S = 1/2 and 3/2 states in the range of 150-290 K with a small hysteresis loop. Frequency- and temperature-dependent alternating-current magnetic susceptibility reveals slow magnetization relaxation under an applied dc field of 3000 Oe. The work here presents the first instance of the five-coordinate mononuclear cobalt(ii)-based SIM exhibiting the thermally induced complete SCO.
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Affiliation(s)
- Lei Chen
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, P. R. China.
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22
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Boča R, Rajnák C, Moncol J, Titiš J, Valigura D. Breaking the Magic Border of One Second for Slow Magnetic Relaxation of Cobalt-Based Single Ion Magnets. Inorg Chem 2018; 57:14314-14321. [DOI: 10.1021/acs.inorgchem.8b02287] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Roman Boča
- Department of Chemistry, Faculty of Natural Sciences, University of SS Cyril and Methodius, SK-917 01 Trnava, Slovakia
| | - Cyril Rajnák
- Department of Chemistry, Faculty of Natural Sciences, University of SS Cyril and Methodius, SK-917 01 Trnava, Slovakia
| | - Ján Moncol
- Institute of Inorganic Chemistry, Slovak University of Technology, SK-812 37 Bratislava, Slovakia
| | - Ján Titiš
- Department of Chemistry, Faculty of Natural Sciences, University of SS Cyril and Methodius, SK-917 01 Trnava, Slovakia
| | - Dušan Valigura
- Department of Chemistry, Faculty of Natural Sciences, University of SS Cyril and Methodius, SK-917 01 Trnava, Slovakia
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23
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Impact of tetrahedral and square planar geometry of Ni(II) complexes with (pseudo)halide ligands to magnetic properties. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2018.08.029] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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24
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Douib H, Cornet L, Gonzalez JF, Trzop E, Dorcet V, Gouasmia A, Ouahab L, Cador O, Pointillart F. Spin‐Crossover and Field‐Induced Single‐Molecule Magnet Behaviour in Metal(II)‐Dipyrazolylpyridine Complexes. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800819] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Haiet Douib
- CNRS ISCR (Institut des Sciences Chimiques de Rennes) ‐ UMR 6226, F Univ Rennes ‐35000 Rennes France
- Laboratoire des Matériaux Organiques et Hétérochimie (LMOH) Département de sciences de la matière Université de Tébessa Rue de Constantine 12002 Tébessa Algérie
| | - Louis Cornet
- CNRS ISCR (Institut des Sciences Chimiques de Rennes) ‐ UMR 6226, F Univ Rennes ‐35000 Rennes France
| | - Jessica Flores Gonzalez
- CNRS ISCR (Institut des Sciences Chimiques de Rennes) ‐ UMR 6226, F Univ Rennes ‐35000 Rennes France
| | - Elzbieta Trzop
- Institut de Physique de Rennes Université de Rennes 1, UMR UR1‐CNRS 6251 Rennes France
| | - Vincent Dorcet
- CNRS ISCR (Institut des Sciences Chimiques de Rennes) ‐ UMR 6226, F Univ Rennes ‐35000 Rennes France
| | - Abdelkrim Gouasmia
- Laboratoire des Matériaux Organiques et Hétérochimie (LMOH) Département de sciences de la matière Université de Tébessa Rue de Constantine 12002 Tébessa Algérie
| | - Lahcène Ouahab
- CNRS ISCR (Institut des Sciences Chimiques de Rennes) ‐ UMR 6226, F Univ Rennes ‐35000 Rennes France
| | - Olivier Cador
- CNRS ISCR (Institut des Sciences Chimiques de Rennes) ‐ UMR 6226, F Univ Rennes ‐35000 Rennes France
| | - Fabrice Pointillart
- CNRS ISCR (Institut des Sciences Chimiques de Rennes) ‐ UMR 6226, F Univ Rennes ‐35000 Rennes France
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25
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Switlicka A, Machura B, Kruszynski R, Cano J, Toma LM, Lloret F, Julve M. The influence of pseudohalide ligands on the SIM behaviour of four-coordinate benzylimidazole-containing cobalt(ii) complexes. Dalton Trans 2018; 47:5831-5842. [PMID: 29648565 DOI: 10.1039/c7dt04735e] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Three, mononuclear complexes of the formula [Co(bmim)2(SCN)2] (1), [Co(bmim)2(NCO)2] (2) and [Co(bmim)2(N3)2] (3) [bmim = 1-benzyl-2-methylimidazole] were prepared and structurally analyzed by single-crystal X-ray crystallography. The cobalt(ii) ions in 1-3 are tetrahedrally coordinated with two bmim molecules and two pseudohalide anions. The angular distortion parameter δ was calculated and the SHAPE program (based on the CShM concept) was used for 1-3 to estimate the angular distortion from an ideal tetrahedron. The molecules of 1-3 are effectively separated, and the values of the shortest distance of cobalt-cobalt are 8.442(6) and 6.774(8) Å for 1, 10.349(8) and 10.716(8) Å for 2 and 6.778(1) and 9.232(1) Å for 3. Direct current (dc) magnetic susceptibility measurements on the crushed crystals of 1-3 were carried out in the temperature range 1.9-295 K. The variable-temperature magnetic data of 1-3 mainly obey the zero-field splitting effect (D) of the 4A2 ground term of the tetrahedral cobalt(ii) complexes (2D being the energy gap between the |±1/2 and |±3/2 levels of the spin). The analysis of their magnetic data through the Hamiltonian H = D[S2z - S(S + 1)/3] + E(Sx2 - Sy2) + gβHS led to the following best-fit parameters: g = 2.29, D = -7.5 cm-1 and E/D = 0.106 (1), g = 2.28, D = + 6.3 cm-1 and E/D = 0.007 (2) and g = 2.36, D = + 6.7 cm-1 and E/D = 0.090 (3). The signs of D for 1-3 were confirmed by Q-band EPR spectra on powdered samples in the temperature range 4.0-20 K. Field-induced SIM behaviour was observed for 1-3 below 4.0 K, and the frequency-dependent maxima of χ''M were observed for 1 and only incipient signals of χ''M occurred for 2 and 3. The values of the exponential factor (τ0) and activation energy (Ea) for 1-3 which were obtained from the Arrhenius plot suggest a single relaxation process characteristic of an Orbach mechanism.
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Affiliation(s)
- A Switlicka
- Department of Crystallography, Institute of Chemistry, University of Silesia, 9th Szkolna St., 40-006 Katowice, Poland.
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26
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Feng M, Tong ML. Single Ion Magnets from 3d to 5f: Developments and Strategies. Chemistry 2018; 24:7574-7594. [PMID: 29385282 DOI: 10.1002/chem.201705761] [Citation(s) in RCA: 221] [Impact Index Per Article: 36.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Indexed: 12/21/2022]
Abstract
Single-ion magnets (SIMs), exhibiting slow magnetization relaxation in the absence of the magnetic field, originate from their single spin-carrier centre. In pursuit of high-performance magnetic properties, such as high spin-reversal barrier and high blocking temperature, various metal centres were investigated to establish SIMs, including 3d and 5d transition metal ions, 4f lanthanide ions, and 5f actinide ions, which possess unique zero-field splitting and magnetic properties. Therefore, proper ligand field is of great importance to different types of metals. In the given great breakthroughs since the first SIM, [Pc2 Tb]- (Pc=dianion of phthalocyanine), was reported, strategies of ligand field design have emerged. In this review, the developments of SIMs with different metal centres are summarized, as well as the possible strategies.
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Affiliation(s)
- Min Feng
- Key Laboratory of Bioinorganic and Synthetic Chemistry, of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275, P. R. China
| | - Ming-Liang Tong
- Key Laboratory of Bioinorganic and Synthetic Chemistry, of Ministry of Education, School of Chemistry, Sun Yat-Sen University, Guangzhou, 510275, P. R. China
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27
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Titiš J, Rajnák C, Valigura D, Boča R. Field influence on the slow magnetic relaxation of nickel-based single ion magnets. Dalton Trans 2018; 47:7879-7882. [DOI: 10.1039/c8dt01445k] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A mononuclear complex, [Ni(pydca)(dmpy)]·H2O, exhibits a slow magnetic relaxation under an applied magnetic field with manifold relaxation channels. With an external field of 0.6 T, the low-frequency channel is the dominating relaxation path yielding a relaxation time of 322 ms at 2.0 K. At 1.2 T the relaxation time is as slow as 876 ms.
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Affiliation(s)
- Ján Titiš
- Department of Chemistry
- Faculty of Natural Sciences
- University of SS Cyril and Methodius
- 917 01 Trnava
- Slovakia
| | - Cyril Rajnák
- Department of Chemistry
- Faculty of Natural Sciences
- University of SS Cyril and Methodius
- 917 01 Trnava
- Slovakia
| | - Dušan Valigura
- Department of Chemistry
- Faculty of Natural Sciences
- University of SS Cyril and Methodius
- 917 01 Trnava
- Slovakia
| | - Roman Boča
- Department of Chemistry
- Faculty of Natural Sciences
- University of SS Cyril and Methodius
- 917 01 Trnava
- Slovakia
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28
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Chen Z, Yin L, Mi X, Wang S, Cao F, Wang Z, Li Y, Lu J, Dou J. Field-induced slow magnetic relaxation of two 1-D compounds containing six-coordinated cobalt(ii) ions: influence of the coordination geometry. Inorg Chem Front 2018. [DOI: 10.1039/c8qi00388b] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two 1-D Co(ii) compounds with different coordination geometries of the same coordination sphere exhibited field-induced slow relaxation magnetization with different D values.
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Affiliation(s)
- Zhiwei Chen
- Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology
- School of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- PR China
| | - Lei Yin
- Wuhan National High Magnetic Field Center & School of Physics
- Huazhong University of Science and Technology
- Wuhan
- P.R. China
| | - Xiuna Mi
- Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology
- School of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- PR China
| | - Suna Wang
- Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology
- School of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- PR China
| | - Fan Cao
- Qingdao University of Science & Technology
- College of Chemistry and Molecular Engineering
- Qingdao
- P. R. China
| | - Zhenxing Wang
- Wuhan National High Magnetic Field Center & School of Physics
- Huazhong University of Science and Technology
- Wuhan
- P.R. China
| | - Yunwu Li
- Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology
- School of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- PR China
| | - Jing Lu
- Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology
- School of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- PR China
| | - Jianmin Dou
- Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology
- School of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng
- PR China
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29
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Escobar LBL, Guedes GP, Soriano S, Cassaro RAA, Marbey J, Hill S, Novak MA, Andruh M, Vaz MGF. Synthesis, Crystal Structures, and EPR Studies of First MnIIILnIII Hetero-binuclear Complexes. Inorg Chem 2017; 57:326-334. [DOI: 10.1021/acs.inorgchem.7b02575] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lívia B. L. Escobar
- Instituto de Química, Universidade Federal Fluminense, Niterói, Rio de Janeiro, 24020-150, Brazil
- Department of Physics and NHMFL, Florida State University, Tallahassee, Florida 32310, United States
| | - Guilherme P. Guedes
- Departamento
de Química, Instituto de Ciências Exatas, Universidade Federal Rural do Rio de Janeiro, Seropédica, Rio de Janeiro, 23897-970, Brazil
| | - Stéphane Soriano
- Instituto de Física, Universidade Federal Fluminense, Niterói, Rio de Janeiro, 24020-140, Brazil
| | - Rafael A. A. Cassaro
- Instituto de Química, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-909, Brazil
| | - Jonathan Marbey
- Department of Physics and NHMFL, Florida State University, Tallahassee, Florida 32310, United States
| | - Stephen Hill
- Department of Physics and NHMFL, Florida State University, Tallahassee, Florida 32310, United States
| | - Miguel A. Novak
- Instituto de Física, Universidade Federal do Rio de Janeiro, Rio de Janeiro, 21941-972, Brazil
| | - Marius Andruh
- Inorganic Chemistry Laboratory, Faculty
of Chemistry, University of Bucharest, Str. Dumbrava Rosie, no. 23, 020464, Bucharest, Romania
| | - Maria G. F. Vaz
- Instituto de Química, Universidade Federal Fluminense, Niterói, Rio de Janeiro, 24020-150, Brazil
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30
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Wang YL, Chen L, Liu CM, Du ZY, Chen LL, Liu QY. 3D chiral and 2D achiral cobalt(ii) compounds constructed from a 4-(benzimidazole-1-yl)benzoic ligand exhibiting field-induced single-ion-magnet-type slow magnetic relaxation. Dalton Trans 2017; 45:7768-75. [PMID: 27054774 DOI: 10.1039/c6dt00676k] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Organizing magnetically isolated 3d transition metal ions, which behave as single-ion magnet (SIM) units, in a coordination network is a promising approach to design novel single-molecule magnets (SMMs). Herein 3D chiral and 2D achiral cobalt(ii) coordination compounds based on single metal nodes with a 4-(benzimidazole-1-yl)benzoic acid (Hbmzbc) ligand, namely, [Co(bmzbc)2(1,2-etdio)]n () (1,2-etdio = 1,2-ethanediol) and [Co(bmzbc)2(Hbmzbc)]n (), have been synthesized and structurally characterized. The 3D chiral structure with 2-fold interpenetrating qtz topological nets consisting of totally achiral components was obtained via spontaneous resolution, while the achiral structure is a 2D (4,4) net. In both structures, individual cobalt(ii) ions are spatially well separated by the long organic ligands in the well-defined networks. Magnetic measurements on and showed field-induced slow magnetic relaxation resulting from single-ion anisotropy of the individual Co(ii) ions. Analysis of the dynamic ac susceptibilities with the Arrhenius law afforded an anisotropy energy barrier of 16.8(3) and 31.3(2) K under a 2 kOe static magnetic field for and , respectively. The distinct coordination environments of the Co(ii) ions in and lead to the different anisotropic energy barriers.
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Affiliation(s)
- Yu-Ling Wang
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, Jiangxi 330022, P. R. China.
| | - Lin Chen
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, Jiangxi 330022, P. R. China.
| | - Cai-Ming Liu
- Beijing National Laboratory for Molecular Sciences, Institution of Chemistry, Chinese Academy of Sciences, Center for Molecular Sciences, Beijing 100190, P. R. China
| | - Zi-Yi Du
- College of Chemistry and Chemical Engineering, Gannan Normal University, Ganzhou 341000, P. R. China
| | - Li-Li Chen
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, Jiangxi 330022, P. R. China.
| | - Qing-Yan Liu
- College of Chemistry and Chemical Engineering, Jiangxi Normal University, Nanchang, Jiangxi 330022, P. R. China.
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31
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Manna S, Bhunia A, Mistri S, Vallejo J, Zangrando E, Puschmann H, Cano J, Manna SC. Single-Ion Magnetic Behavior in CoII
-CoIII
Mixed-Valence Dinuclear and Pseudodinuclear Complexes. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700046] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Soumen Manna
- Department of Chemistry and Chemical Technology; Vidyasagar University; 721102 Midnapore West Bengal India
| | - Apurba Bhunia
- Department of Chemistry and Chemical Technology; Vidyasagar University; 721102 Midnapore West Bengal India
| | - Soumen Mistri
- Department of Chemistry and Chemical Technology; Vidyasagar University; 721102 Midnapore West Bengal India
| | - Julia Vallejo
- Institut de Ciència Molecular (ICMol); Universitat de València; 46980 Paterna Valencia Spain
| | - Ennio Zangrando
- Department of Chemical and Pharmaceutical Sciences; University of Trieste; 34127 Trieste Italy
| | - Horst Puschmann
- Department of Chemistry; University of Durham; South Road DH1 3LE Durham UK
| | - Joan Cano
- Institut de Ciència Molecular (ICMol); Universitat de València; 46980 Paterna Valencia Spain
- Fundació General de la Universitat de València (FGUV); Universitat de València; 46980 Paterna València Spain
| | - Subal Chandra Manna
- Department of Chemistry and Chemical Technology; Vidyasagar University; 721102 Midnapore West Bengal India
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32
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Palion-Gazda J, Machura B, Kruszynski R, Grancha T, Moliner N, Lloret F, Julve M. Spin Crossover in Double Salts Containing Six- and Four-Coordinate Cobalt(II) Ions. Inorg Chem 2017; 56:6281-6296. [DOI: 10.1021/acs.inorgchem.7b00360] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Joanna Palion-Gazda
- Department of Crystallography, Institute of Chemistry, University of Silesia, Ninth Szkolna Street, 40006 Katowice, Poland
| | - Barbara Machura
- Department of Crystallography, Institute of Chemistry, University of Silesia, Ninth Szkolna Street, 40006 Katowice, Poland
| | - Rafal Kruszynski
- Department of X-ray Crystallography and Crystal Chemistry, Institute
of General and Ecological Chemistry, Lodz University of Technology, 116 Żeromski Street, 90-924 Łódź, Poland
| | - Thais Grancha
- Departament de Química Inorgànica/Instituto de Ciencia
Molecular (ICMol), Universitat de València, C/Catedrático José
Beltrán 2, 46980 Paterna, València, Spain
| | - Nicolás Moliner
- Departament de Química Inorgànica/Instituto de Ciencia
Molecular (ICMol), Universitat de València, C/Catedrático José
Beltrán 2, 46980 Paterna, València, Spain
| | - Francesc Lloret
- Departament de Química Inorgànica/Instituto de Ciencia
Molecular (ICMol), Universitat de València, C/Catedrático José
Beltrán 2, 46980 Paterna, València, Spain
| | - Miguel Julve
- Departament de Química Inorgànica/Instituto de Ciencia
Molecular (ICMol), Universitat de València, C/Catedrático José
Beltrán 2, 46980 Paterna, València, Spain
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33
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Molecular magnetism, quo vadis? A historical perspective from a coordination chemist viewpoint☆. Coord Chem Rev 2017. [DOI: 10.1016/j.ccr.2017.03.004] [Citation(s) in RCA: 240] [Impact Index Per Article: 34.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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34
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Liu YM, Liu ZY, Yang EC, Zhao XJ. Field-induced slow relaxation of a manganese(III)-based single-ion magnet. INORG CHEM COMMUN 2017. [DOI: 10.1016/j.inoche.2017.01.030] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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35
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Rodríguez-Diéguez A, Pérez-Yáñez S, Ruiz-Rubio L, Seco JM, Cepeda J. From isolated to 2D coordination polymers based on 6-aminonicotinate and 3d-metal ions: towards field-induced single-ion-magnets. CrystEngComm 2017. [DOI: 10.1039/c7ce00234c] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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36
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Dolai M, Mondal A, Liu JL, Ali M. Three novel mononuclear Mn(iii)-based magnetic materials with square pyramidal versus octahedral geometries. NEW J CHEM 2017. [DOI: 10.1039/c7nj02919e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Single crystal X-ray diffraction studies reveal that complexes 1 and 2 have square pyramidal geometry and 3 has octahedral geometry, which showed a dependence of negative anisotropy (D) values on the electronic, geometry and packing effects.
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Affiliation(s)
- Malay Dolai
- Department of Chemistry Jadavpur University
- Kolkata 700 032
- India
| | - Abhishake Mondal
- Institut für Anorganische Chemie
- Karlsruher Institut für Technologie (KIT)
- 76131 Karlsruhe
- Germany
- Centre de Recherche Paul Pascal (CRPP)
| | - Jun-Liang Liu
- Centre de Recherche Paul Pascal (CRPP)
- CNRS
- UPR 8641
- F-33600 Pessac
- France
| | - Mahammad Ali
- Department of Chemistry Jadavpur University
- Kolkata 700 032
- India
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37
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Xiang J, Liu JJ, Chen XX, Jia LH, Yu F, Wang BW, Gao S, Lau TC. Slow magnetic relaxation in a mononuclear 8-coordinate Fe(ii) complex. Chem Commun (Camb) 2017; 53:1474-1477. [DOI: 10.1039/c6cc09801k] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis and structure of an 8-coordinate Fe(ii) compound [FeII(L1)2](ClO4)2 (1) with a [FeN4O4] core are reported. It is the first example of an 8-coordinate Fe(ii) complex exhibiting field-induced single-molecule magnet (SMM) behaviour.
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Affiliation(s)
- Jing Xiang
- College of Chemistry and Environmental Engineering
- Yangtze University
- Jingzhou 434020
- P. R. China
| | - Jia-Jia Liu
- State Key Laboratory of Rare Earth Materials Chemistry and Applications and PKU-HKU Joint Laboratory on Rare Earth Materials and Bioinorganic Chemistry
- Peking University
- Beijing 100871
- China
| | - Xiao-Xiang Chen
- State Key Laboratory of Rare Earth Materials Chemistry and Applications and PKU-HKU Joint Laboratory on Rare Earth Materials and Bioinorganic Chemistry
- Peking University
- Beijing 100871
- China
| | - Li-Hui Jia
- School of Chemistry and Environmental Engineering
- Wuhan Institute of Technology
- Wuhan 430073
- P. R. China
| | - Fei Yu
- College of Chemistry and Environmental Engineering
- Yangtze University
- Jingzhou 434020
- P. R. China
| | - Bing-Wu Wang
- State Key Laboratory of Rare Earth Materials Chemistry and Applications and PKU-HKU Joint Laboratory on Rare Earth Materials and Bioinorganic Chemistry
- Peking University
- Beijing 100871
- China
| | - Song Gao
- State Key Laboratory of Rare Earth Materials Chemistry and Applications and PKU-HKU Joint Laboratory on Rare Earth Materials and Bioinorganic Chemistry
- Peking University
- Beijing 100871
- China
| | - Tai-Chu Lau
- Department of Biology and Chemistry
- Institute of Molecular Functional Materials
- City University of Hong Kong
- Kowloon Tong
- China
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38
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Arauzo A, Bartolomé E, Benniston AC, Melnic S, Shova S, Luzón J, Alonso PJ, Barra AL, Bartolomé J. Slow magnetic relaxation in a dimeric Mn2Ca2 complex enabled by the large Mn(iii) rhombicity. Dalton Trans 2017; 46:720-732. [DOI: 10.1039/c6dt02509a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
A large single-ion transverse anisotropy at Mn(iii) sites induces slow magnetic relaxation at zero magnetic field of the ferromagnetic Mn dimers in a singular Mn2Ca2 complex.
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Affiliation(s)
- Ana Arauzo
- Servicio de Medidas Físicas
- Universidad de Zaragoza
- 50009 Zaragoza
- Spain
| | - Elena Bartolomé
- Escola Universitària Salesiana de Sarrià (EUSS)
- 08017 Barcelona
- Spain
| | - Andrew C. Benniston
- Molecular Photonics Laboratory
- School of Chemistry
- Newcastle University
- Newcastle-upon-Tyne
- UK
| | - Silvia Melnic
- Institute of Chemistry
- Academy of Sciences of Moldova
- Chisinau
- Moldova
| | - Sergiu Shova
- Institute of Macromolecular Chemistry “Petru Poni” Iasi
- 700487 Iasi
- Romania
| | - Javier Luzón
- Centro Universitario de la Defensa
- Academia General Militar
- Zaragoza
- Spain
- Instituto de Ciencia de Materiales de Aragón and Departamento de Física de la Materia Condensada
| | - Pablo J. Alonso
- Instituto de Ciencia de Materiales de Aragón and Departamento de Física de la Materia Condensada
- CSIC-Universidad de Zaragoza
- 50009 Zaragoza
- Spain
| | - Anne-Laure Barra
- Laboratoire National des Champs Magnétiques Intenses
- CNRS and Université Grenoble Alpes
- 38042 Grenoble Cedex 9
- France
| | - Juan Bartolomé
- Instituto de Ciencia de Materiales de Aragón and Departamento de Física de la Materia Condensada
- CSIC-Universidad de Zaragoza
- 50009 Zaragoza
- Spain
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39
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Chen L, Cui HH, Stavretis SE, Hunter SC, Zhang YQ, Chen XT, Sun YC, Wang Z, Song Y, Podlesnyak AA, Ouyang ZW, Xue ZL. Slow Magnetic Relaxations in Cobalt(II) Tetranitrate Complexes. Studies of Magnetic Anisotropy by Inelastic Neutron Scattering and High-Frequency and High-Field EPR Spectroscopy. Inorg Chem 2016; 55:12603-12617. [PMID: 27989182 DOI: 10.1021/acs.inorgchem.6b01544] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Three mononuclear cobalt(II) tetranitrate complexes (A)2[Co(NO3)4] with different countercations, Ph4P+ (1), MePh3P+ (2), and Ph4As+ (3), have been synthesized and studied by X-ray single-crystal diffraction, magnetic measurements, inelastic neutron scattering (INS), high-frequency and high-field EPR (HF-EPR) spectroscopy, and theoretical calculations. The X-ray diffraction studies reveal that the structure of the tetranitrate cobalt anion varies with the countercation. 1 and 2 exhibit highly irregular seven-coordinate geometries, while the central Co(II) ion of 3 is in a distorted-dodecahedral configuration. The sole magnetic transition observed in the INS spectroscopy of 1-3 corresponds to the zero-field splitting (2(D2 + 3E2)1/2) from 22.5(2) cm-1 in 1 to 26.6(3) cm-1 in 2 and 11.1(5) cm-1 in 3. The positive sign of the D value, and hence the easy-plane magnetic anisotropy, was demonstrated for 1 by INS studies under magnetic fields and HF-EPR spectroscopy. The combined analyses of INS and HF-EPR data yield the D values as +10.90(3), +12.74(3), and +4.50(3) cm-1 for 1-3, respectively. Frequency- and temperature-dependent alternating-current magnetic susceptibility measurements reveal the slow magnetization relaxation in 1 and 2 at an applied dc field of 600 Oe, which is a characteristic of field-induced single-molecule magnets (SMMs). The electronic structures and the origin of magnetic anisotropy of 1-3 were revealed by calculations at the CASPT2/NEVPT2 level.
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Affiliation(s)
- Lei Chen
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210023, People's Republic of China
| | - Hui-Hui Cui
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210023, People's Republic of China
| | - Shelby E Stavretis
- Department of Chemistry, University of Tennessee , Knoxville, Tennessee 37996, United States
| | - Seth C Hunter
- Department of Chemistry, University of Tennessee , Knoxville, Tennessee 37996, United States
| | - Yi-Quan Zhang
- Jiangsu Key Laboratory for NSLSCS, School of Physical Science and Technology, Nanjing Normal University , Nanjing 210023, People's Republic of China
| | - Xue-Tai Chen
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210023, People's Republic of China
| | - Yi-Chen Sun
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology , Wuhan 430074, People's Republic of China
| | - Zhenxing Wang
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology , Wuhan 430074, People's Republic of China
| | - You Song
- State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University , Nanjing 210023, People's Republic of China
| | - Andrey A Podlesnyak
- Quantum Condensed Matter Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States
| | - Zhong-Wen Ouyang
- Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology , Wuhan 430074, People's Republic of China
| | - Zi-Ling Xue
- Department of Chemistry, University of Tennessee , Knoxville, Tennessee 37996, United States
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40
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Vaidya S, Tewary S, Singh SK, Langley SK, Murray KS, Lan Y, Wernsdorfer W, Rajaraman G, Shanmugam M. What Controls the Sign and Magnitude of Magnetic Anisotropy in Tetrahedral Cobalt(II) Single-Ion Magnets? Inorg Chem 2016; 55:9564-9578. [DOI: 10.1021/acs.inorgchem.6b01073] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shefali Vaidya
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra India
| | - Subrata Tewary
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra India
| | - Saurabh Kumar Singh
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra India
| | - Stuart K. Langley
- School
of Science and the Environment, Chemistry Division, Manchester Metropolitan University, Manchester M15 6HB, U.K
| | - Keith S. Murray
- School
of Chemistry, Monash University, Clayton 3800, Victoria, Australia
| | - Yanhua Lan
- Institut
Néel, CNRS and Université Grenoble Alpes, BP 166,
25 Avenue des Martyrs, 38042 Grenoble Cedex 9, France
| | - Wolfgang Wernsdorfer
- Institut
Néel, CNRS and Université Grenoble Alpes, BP 166,
25 Avenue des Martyrs, 38042 Grenoble Cedex 9, France
| | - Gopalan Rajaraman
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra India
| | - Maheswaran Shanmugam
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, Maharashtra India
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41
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Sottini S, Poneti G, Ciattini S, Levesanos N, Ferentinos E, Krzystek J, Sorace L, Kyritsis P. Magnetic Anisotropy of Tetrahedral Co II Single-Ion Magnets: Solid-State Effects. Inorg Chem 2016; 55:9537-9548. [PMID: 27636564 DOI: 10.1021/acs.inorgchem.6b00508] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
This study reports the static and dynamic magnetic characterization of two mononuclear tetrahedral CoII complexes, [Co{iPr2P(E)NP(E)iPr2}2], where E = S (CoS4) and Se (CoSe4), which behave as single-ion magnets (SIMs). Low-temperature (15 K) single-crystal X-ray diffraction studies point out that the two complexes exhibit similar structural features in their first coordination sphere, but a disordered peripheral iPr group is observed only in CoS4. Although the latter complex crystallizes in an axial space group, the observed structural disorder leads to larger transverse magnetic anisotropy for the majority of the molecules compared to CoSe4, as confirmed by electron paramagnetic resonance spectroscopy. Static magnetic characterization indicates that both CoS4 and CoSe4 show easy-axis anisotropy, with comparable D values (∼-30 cm-1). Moreover, alternating-current susceptibility measurements on these CoII complexes, magnetically diluted in their isostructural ZnII analogues, highlight the role of dipolar magnetic coupling in the mechanism of magnetization reversal. In addition, our findings suggest that, despite their similar anisotropic features, CoS4 and CoSe4 relax magnetically via different processes. This work provides experimental evidence that solid-state effects may affect the magnetic behavior of SIMs.
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Affiliation(s)
- Silvia Sottini
- Department of Chemistry "Ugo Schiff" and INSTM Research Unit of Florence, University of Florence , via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| | - Giordano Poneti
- Department of Chemistry "Ugo Schiff" and INSTM Research Unit of Florence, University of Florence , via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| | - Samuele Ciattini
- Centro Interdipartimentale di Crystallografia Strutturale CRIST, University of Florence , via della Lastruccia 5, 50019 Sesto Fiorentino, Italy
| | - Nikolaos Levesanos
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens , Panepistimiopolis, GR-15771 Athens, Greece
| | - Eleftherios Ferentinos
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens , Panepistimiopolis, GR-15771 Athens, Greece
| | - J Krzystek
- National High Magnetic Field Laboratory (NHMFL), Florida State University , Tallahassee, Florida 32310, United States
| | - Lorenzo Sorace
- Department of Chemistry "Ugo Schiff" and INSTM Research Unit of Florence, University of Florence , via della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy
| | - Panayotis Kyritsis
- Inorganic Chemistry Laboratory, Department of Chemistry, National and Kapodistrian University of Athens , Panepistimiopolis, GR-15771 Athens, Greece
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42
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Villa-Pérez C, Oyarzabal I, Echeverría GA, Valencia-Uribe GC, Seco JM, Soria DB. Single-Ion Magnets Based on Mononuclear Cobalt(II) Complexes with Sulfadiazine. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600777] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Cristian Villa-Pérez
- CEQUINOR; CONICET; CCT La Plata; Departamento de Química; Facultad de Ciencias Exactas; Universidad Nacional de la Plata; 47 y 115 1900 La Plata Argentina
| | - Itziar Oyarzabal
- Departamento de Química Aplicada Facultad de Química; UPV/EHU; Paseo Manuel de Lardizábal 3 20018 Donostia-San Sebastián Spain
| | - Gustavo A. Echeverría
- IFLP; CONICET; CCT La Plata; Departamento de Física; Facultad de Ciencias Exactas; Universidad Nacional de La Plata; 1900 La Plata Argentina
| | - Gloria C. Valencia-Uribe
- GIAFOT; Departamento de Química; Facultad de Ciencias; Universidad Nacional de Colombia-Sede Medellín; Calle 59 A No 63-020 Medellín Colombia
| | - José M. Seco
- Departamento de Química Aplicada Facultad de Química; UPV/EHU; Paseo Manuel de Lardizábal 3 20018 Donostia-San Sebastián Spain
| | - Delia B. Soria
- CEQUINOR; CONICET; CCT La Plata; Departamento de Química; Facultad de Ciencias Exactas; Universidad Nacional de la Plata; 47 y 115 1900 La Plata Argentina
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43
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Xue H, Zhao JW, Pan R, Yang BF, Yang GY, Liu HS. Diverse Ligand-Functionalized Mixed-Valent Hexamanganese Sandwiched Silicotungstates with Single-Molecule Magnet Behavior. Chemistry 2016; 22:12322-31. [DOI: 10.1002/chem.201600622] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Indexed: 11/11/2022]
Affiliation(s)
- Han Xue
- MOE Key Laboratory of Cluster Science; School of Chemistry; Beijing Institute of Technology; Beijing 100081 P. R. China
| | - Jun-Wei Zhao
- Henan Key Laboratory of Polyoxometalate Chemistry; College of Chemistry and Chemical Engineering; Henan University; Kaifeng Henan 475004 P. R. China
| | - Rui Pan
- MOE Key Laboratory of Cluster Science; School of Chemistry; Beijing Institute of Technology; Beijing 100081 P. R. China
| | - Bai-Feng Yang
- MOE Key Laboratory of Cluster Science; School of Chemistry; Beijing Institute of Technology; Beijing 100081 P. R. China
| | - Guo-Yu Yang
- MOE Key Laboratory of Cluster Science; School of Chemistry; Beijing Institute of Technology; Beijing 100081 P. R. China
- Department of Chemistry; Key Laboratory for Preparation and Application of Ordered Structural Materials of Guangdong Province; Shantou University, Shantou; Guangdong 515063 P. R. China
| | - Hong-Sheng Liu
- Key Laboratory of Oilfield Applied Chemistry; College of Heilongjiang Province; Daqing Normal University, Daqing; Heilongjiang 163712 P. R. China
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Frost JM, Harriman KLM, Murugesu M. The rise of 3-d single-ion magnets in molecular magnetism: towards materials from molecules? Chem Sci 2016; 7:2470-2491. [PMID: 28660017 PMCID: PMC5477015 DOI: 10.1039/c5sc03224e] [Citation(s) in RCA: 421] [Impact Index Per Article: 52.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2015] [Accepted: 12/22/2015] [Indexed: 12/22/2022] Open
Abstract
Single-molecule magnets (SMMs) that contain one spin centre (so-called single-ion magnets) theoretically represent the smallest possible unit for spin-based electronic devices. The realisation of this and related technologies, depends on first being able to design systems with sufficiently large energy barriers to magnetisation reversal, Ueff, and secondly, on being able to organise these molecules into addressable arrays. In recent years, significant progress has been made towards the former goal - principally as a result of efforts which have been directed towards studying complexes based on highly anisotropic lanthanide ions, such as Tb(iii) and Dy(iii). Since 2013 however, and the remarkable report by Long and co-workers of a linear Fe(i) system exhibiting Ueff = 325 K, single-ion systems of transition metals have undergone something of a renaissance in the literature. Not only do they have important lessons to teach us about anisotropy and relaxation dynamics in the quest to enhance Ueff, the ability to create strongly coupled spin systems potentially offers access to a whole of host of 1, 2 and 3-dimensional materials with interesting structural and physical properties. This perspective summarises recent progress in this rapidly expanding sub-genre of molecular magnetism from the viewpoint of the synthetic chemist, with a particular focus on the lessons that have so far been learned from single-ion magnets of the d-block, and, the future research directions which we feel are likely to emerge in the coming years.
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Affiliation(s)
- Jamie M Frost
- Department of Chemistry and Biomolecular Sciences , University of Ottawa , Ontario , Canada K1N 6N5 . ; ; Tel: +1 613-562-5800 ext. 2733
| | - Katie L M Harriman
- Department of Chemistry and Biomolecular Sciences , University of Ottawa , Ontario , Canada K1N 6N5 . ; ; Tel: +1 613-562-5800 ext. 2733
| | - Muralee Murugesu
- Department of Chemistry and Biomolecular Sciences , University of Ottawa , Ontario , Canada K1N 6N5 . ; ; Tel: +1 613-562-5800 ext. 2733
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Ziegenbalg S, Hornig D, Görls H, Plass W. Cobalt(II)-Based Single-Ion Magnets with Distorted Pseudotetrahedral [N2O2] Coordination: Experimental and Theoretical Investigations. Inorg Chem 2016; 55:4047-58. [DOI: 10.1021/acs.inorgchem.6b00373] [Citation(s) in RCA: 67] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Sven Ziegenbalg
- Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena, Humboldtstrasse 8, 07743 Jena, Germany
| | - David Hornig
- Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena, Humboldtstrasse 8, 07743 Jena, Germany
| | - Helmar Görls
- Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena, Humboldtstrasse 8, 07743 Jena, Germany
| | - Winfried Plass
- Institut für Anorganische und Analytische Chemie, Friedrich-Schiller-Universität Jena, Humboldtstrasse 8, 07743 Jena, Germany
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Lin W, Bodenstein T, Mereacre V, Fink K, Eichhöfer A. Field-Induced Slow Magnetic Relaxation in the Ni(I) Complexes [NiCl(PPh3)2]·C4H8O and [Ni(N(SiMe3)2)(PPh3)2]. Inorg Chem 2016; 55:2091-100. [DOI: 10.1021/acs.inorgchem.5b02497] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Weiquan Lin
- Lehn Institute of Functional Materials, Sun Yat-Sen University, Guangzhou 510275, China
- Institut für Nanotechnologie, Karlsruher Institut für Technologie (KIT), Campus Nord, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Tilmann Bodenstein
- Institut für Nanotechnologie, Karlsruher Institut für Technologie (KIT), Campus Nord, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Valeriu Mereacre
- Institut für Anorganische Chemie, Karlsruher Institut für Technologie (KIT), Campus Süd, Engesserstrasse
15, 76131 Karlsruhe, Germany
| | - Karin Fink
- Institut für Nanotechnologie, Karlsruher Institut für Technologie (KIT), Campus Nord, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Andreas Eichhöfer
- Lehn Institute of Functional Materials, Sun Yat-Sen University, Guangzhou 510275, China
- Institut für Nanotechnologie, Karlsruher Institut für Technologie (KIT), Campus Nord, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
- Karlsruhe Nano Micro Facility (KNMF), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
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47
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Magnetic anisotropy in two- to eight-coordinated transition–metal complexes: Recent developments in molecular magnetism. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2015.06.013] [Citation(s) in RCA: 304] [Impact Index Per Article: 38.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Świtlicka-Olszewska A, Palion-Gazda J, Klemens T, Machura B, Vallejo J, Cano J, Lloret F, Julve M. Single-ion magnet behaviour in mononuclear and two-dimensional dicyanamide-containing cobalt(ii) complexes. Dalton Trans 2016; 45:10181-93. [DOI: 10.1039/c6dt01160h] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The magneto-structural features of one mononuclear and two layered Co(ii) complexes being new examples of Single-Ion Magnets (SIMs) are reported.
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Affiliation(s)
| | - Joanna Palion-Gazda
- Department of Crystallography
- Institute of Chemistry
- University of Silesia
- 40-006 Katowice
- Poland
| | - Tomasz Klemens
- Department of Crystallography
- Institute of Chemistry
- University of Silesia
- 40-006 Katowice
- Poland
| | - Barbara Machura
- Department of Crystallography
- Institute of Chemistry
- University of Silesia
- 40-006 Katowice
- Poland
| | - Julia Vallejo
- Department of Química Inorgànica/Instituto de Ciencia Molecular (ICMol)
- Facultat de Quimica de la Universitat de València
- València
- Spain
| | - Joan Cano
- Department of Química Inorgànica/Instituto de Ciencia Molecular (ICMol)
- Facultat de Quimica de la Universitat de València
- València
- Spain
- Fundació General de la Universitat de València (FGUV)
| | - Francesc Lloret
- Department of Química Inorgànica/Instituto de Ciencia Molecular (ICMol)
- Facultat de Quimica de la Universitat de València
- València
- Spain
| | - Miguel Julve
- Department of Química Inorgànica/Instituto de Ciencia Molecular (ICMol)
- Facultat de Quimica de la Universitat de València
- València
- Spain
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Jia J, Zhang Y, Zhang P, Ma P, Zhang D, Wang J, Niu J. Synthesis and characterization of a series of novel polyoxometalate-supported carbonyl manganese derivatives. RSC Adv 2016. [DOI: 10.1039/c6ra23547f] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A series of novel heteropolytungstates-supported carbonyl manganese derivatives have been synthesized, which are the first examples of grafting [Mn(CO)3]+ moieties and Mn2+ on the tungsto-antimonates/bismutates.
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Affiliation(s)
- Jiage Jia
- Henan Key Laboratory of Polyoxometalate Chemistry
- Institute of Molecular and Crystal Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng 475004
| | - Yanhui Zhang
- Henan Key Laboratory of Polyoxometalate Chemistry
- Institute of Molecular and Crystal Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng 475004
| | - Panpan Zhang
- Henan Key Laboratory of Polyoxometalate Chemistry
- Institute of Molecular and Crystal Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng 475004
| | - Pengtao Ma
- Henan Key Laboratory of Polyoxometalate Chemistry
- Institute of Molecular and Crystal Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng 475004
| | - Dongdi Zhang
- Henan Key Laboratory of Polyoxometalate Chemistry
- Institute of Molecular and Crystal Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng 475004
| | - Jingping Wang
- Henan Key Laboratory of Polyoxometalate Chemistry
- Institute of Molecular and Crystal Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng 475004
| | - Jingyang Niu
- Henan Key Laboratory of Polyoxometalate Chemistry
- Institute of Molecular and Crystal Engineering
- College of Chemistry and Chemical Engineering
- Henan University
- Kaifeng 475004
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50
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Nemec I, Herchel R, Trávníček Z, Šilha T. Field-induced slow relaxation of magnetization in dinuclear and trinuclear CoIII⋯MnIII complexes. RSC Adv 2016. [DOI: 10.1039/c5ra23922b] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Magnetic anisotropy and field-induced slow relaxation of magnetization were studied in dinuclear and trinuclear heterobimetallic CoIII⋯MnIII complexes.
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Affiliation(s)
- Ivan Nemec
- Regional Centre of Advanced Technologies and Materials & Department of Inorganic Chemistry
- Faculty of Science
- Palacký University
- 771 46 Olomouc
- Czech Republic
| | - Radovan Herchel
- Regional Centre of Advanced Technologies and Materials & Department of Inorganic Chemistry
- Faculty of Science
- Palacký University
- 771 46 Olomouc
- Czech Republic
| | - Zdeněk Trávníček
- Regional Centre of Advanced Technologies and Materials & Department of Inorganic Chemistry
- Faculty of Science
- Palacký University
- 771 46 Olomouc
- Czech Republic
| | - Tomáš Šilha
- Regional Centre of Advanced Technologies and Materials & Department of Inorganic Chemistry
- Faculty of Science
- Palacký University
- 771 46 Olomouc
- Czech Republic
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