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Orts-Arroyo M, Rojas-Dotti C, Moliner N, Martínez-Lillo J. Lipoic Acid-Functionalized Hexanuclear Manganese(III) Nanomagnets Suitable for Surface Grafting. Int J Mol Sci 2023; 24:ijms24108645. [PMID: 37239996 DOI: 10.3390/ijms24108645] [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: 03/31/2023] [Revised: 05/05/2023] [Accepted: 05/09/2023] [Indexed: 05/28/2023] Open
Abstract
Highly anisotropic single-molecule magnets (SMMs) have attracted much interest in the field of molecular magnetism because of their spin features and potential technological applications. Additionally, a great effort has been devoted to the functionalization of such molecule-based systems which are made with ligands containing functional groups suitable to connect SMMs to junction devices or to perform their grafting on surfaces of different substrates. We have synthesized and characterized two lipoic acid-functionalized and oxime-based Mn(III) compounds, of formula [Mn6(μ3-O)2(H2N-sao)6(lip)2(MeOH)6][Mn6(μ3-O)2(H2N-sao)6(cnph)2(MeOH)6]}·10MeOH (1) and [Mn6(μ3-O)2(H2N-sao)6(lip)2(EtOH)6]·EtOH·2H2O (2) [H2N-saoH2 = salicylamidoxime, lip = lipoate anion, cnph = 2-cyanophenolate anion]. Compound 1 crystallizes in the space group Pī of the triclinic system and 2 crystallizes in the space group C2/c of the monoclinic system. In the crystal, neighboring Mn6 entities are linked using non-coordinating solvent molecules, which are H-bonded to N atoms of -NH2 groups of amidoxime ligand. In addition, Hirshfeld surfaces of 1 and 2 were calculated to study the variety of intermolecular interactions and the different levels of importance that take place in their crystal lattice; this type of computed study is the first time performed on Mn6 complexes. The study of the magnetic properties of 1 and 2 through dc magnetic susceptibility measurements reveals the coexistence of ferromagnetic and antiferromagnetic exchange couplings between the Mn(III) metal ions in both compounds, the latter being the predominant magnetic interaction. A spin S = 4 value of the ground state was obtained using isotropic simulations of the experimental magnetic susceptibility data for both 1 and 2. Ac magnetic susceptibility measurements show features typical of slow relaxation of the magnetization in 1 and 2, which indicate that SMM behavior takes place in both compounds.
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Affiliation(s)
- Marta Orts-Arroyo
- Departament de Química Inorgànica, Instituto de Ciencia Molecular (ICMol), Universitat de València, c/Catedrático José Beltrán 2, 46980 Paterna, Spain
| | - Carlos Rojas-Dotti
- Departament de Química Inorgànica, Instituto de Ciencia Molecular (ICMol), Universitat de València, c/Catedrático José Beltrán 2, 46980 Paterna, Spain
| | - Nicolás Moliner
- Departament de Química Inorgànica, Instituto de Ciencia Molecular (ICMol), Universitat de València, c/Catedrático José Beltrán 2, 46980 Paterna, Spain
| | - José Martínez-Lillo
- Departament de Química Inorgànica, Instituto de Ciencia Molecular (ICMol), Universitat de València, c/Catedrático José Beltrán 2, 46980 Paterna, Spain
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Sanchis-Perucho A, Martínez-Lillo J. A new family of one-dimensional bromo-bridged Ir(IV)-Cu(II) complexes based on the hexabromoiridate(IV) metalloligand. Dalton Trans 2022; 51:3323-3330. [PMID: 35133370 DOI: 10.1039/d1dt04384f] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
By using the iridium(IV) complex (NBu4)2[IrBr6] (1) as a metalloligand towards a Cu(II) metal ion, three novel Ir(IV) one-dimensional (1D) compounds of formula {IrBr5(μ-Br)Cu(Meim)4}n (2), {IrBr5(μ-Br)Cu(Viim)4}n (3) and {IrBr5(μ-Br)Cu(Buim)4}n (4), [Meim = 1-methylimidazole; Viim = 1-vinylimidazole; Buim = 1-butylimidazole] have been prepared and structurally and magnetically characterised. Compounds 2, 3 and 4 crystallise in the triclinic, monoclinic and orthorhombic crystal systems with space groups P1̄, C2/c and Pccn, respectively. Each Ir(IV) ion in 1-4 is six-coordinate and bonded to six bromide ions in a quasi regular octahedral geometry. In compounds 2-4, the CuII ion shows an axially elongated octahedron with four N atoms, from four monodentate imidazole derivative ligands, that form the equatorial plane and two bromide ions that occupy the axial positions. Cu(II) and Ir(IV) ions are linked through bridging bromide anions generating Ir(IV)-Cu(II) chains [with intrachain Cu(II)⋯Ir(IV) distances covering the range of ca. 5.10-5.42 Å]. In the crystal lattice of 2 and 3 are observed significant intermolecular Ir-Br⋯Br-Ir contacts and π⋯Br interactions, which organize arrangements that contribute to stabilizing the crystal structure of these Ir(IV)-based compounds. DC magnetic susceptibility measurements reveal that 1 displays magnetic behaviour typical of noninteracting mononuclear centres with S = 1/2. Besides, antiferromagnetic behaviour (2 and 3) and ferromagnetic (4) exchange coupling occur between the Cu(II) and Ir(IV) metal ions in the one-dimensional bromo-bridged compounds 2-4. Moreover, the study of the AC magnetic susceptibility shows a field-induced slow relaxation of the magnetisation for 1, indicating the presence of the single-ion magnet (SIM) phenomenon for the magnetically isolated hexabromoiridate(IV) complex.
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Affiliation(s)
- Adrián Sanchis-Perucho
- Instituto de Ciencia Molecular (ICMol)/Departament de Química Inorgànica, Universitat de València, C/Catedrático José Beltrán 2, 46980, Paterna, Valencia, Spain.
| | - José Martínez-Lillo
- Instituto de Ciencia Molecular (ICMol)/Departament de Química Inorgànica, Universitat de València, C/Catedrático José Beltrán 2, 46980, Paterna, Valencia, Spain.
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Sanchis-Perucho A, Orts-Arroyo M, Camús-Hernández J, Rojas-Dotti C, Escrivà E, Lloret F, Martínez-Lillo J. Hexahalorhenate( iv) salts of protonated ciprofloxacin: antibiotic-based single-ion magnets. CrystEngComm 2021. [DOI: 10.1039/d1ce01337h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
In the crystal lattice of two novel ReIV compounds, the paramagnetic [ReCl6]2− and [ReBr6]2− anions are well separated from each other through two protonated forms of the antibiotic ciprofloxacin. These compounds behave as single-ion magnets (SIMs).
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Affiliation(s)
- Adrián Sanchis-Perucho
- Instituto de Ciencia Molecular (ICMol)/Departament de Química Inorgànica, Universitat de València, c/ Catedrático José Beltrán 2, 46980, Paterna, València, Spain
| | - Marta Orts-Arroyo
- Instituto de Ciencia Molecular (ICMol)/Departament de Química Inorgànica, Universitat de València, c/ Catedrático José Beltrán 2, 46980, Paterna, València, Spain
| | - Javier Camús-Hernández
- Instituto de Ciencia Molecular (ICMol)/Departament de Química Inorgànica, Universitat de València, c/ Catedrático José Beltrán 2, 46980, Paterna, València, Spain
| | - Carlos Rojas-Dotti
- Instituto de Ciencia Molecular (ICMol)/Departament de Química Inorgànica, Universitat de València, c/ Catedrático José Beltrán 2, 46980, Paterna, València, Spain
| | - Emilio Escrivà
- Departament de Química Inorgànica, Facultat de Química, Universitat de València, Av. Vicente Andrés Estellés s/n, 46100, Burjassot, València, Spain
| | - Francesc Lloret
- Instituto de Ciencia Molecular (ICMol)/Departament de Química Inorgànica, Universitat de València, c/ Catedrático José Beltrán 2, 46980, Paterna, València, Spain
| | - José Martínez-Lillo
- Instituto de Ciencia Molecular (ICMol)/Departament de Química Inorgànica, Universitat de València, c/ Catedrático José Beltrán 2, 46980, Paterna, València, Spain
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Tyagi P, Riso C, Amir U, Rojas-Dotti C, Martínez-Lillo J. Exploring room-temperature transport of single-molecule magnet-based molecular spintronics devices using the magnetic tunnel junction as a device platform. RSC Adv 2020; 10:13006-13015. [PMID: 35492095 PMCID: PMC9051408 DOI: 10.1039/c9ra09003g] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2019] [Accepted: 03/11/2020] [Indexed: 11/21/2022] Open
Abstract
A device architecture utilizing a single-molecule magnet (SMM) as a device element between two ferromagnetic electrodes may open vast opportunities to create novel molecular spintronics devices. Here, we report a method of connecting an SMM to the ferromagnetic electrodes. We utilized a nickel (Ni)–AlOx–Ni magnetic tunnel junction (MTJ) with the exposed side edges as a test bed. In the present work, we utilized an SMM with a hexanuclear [Mn6(μ3-O)2(H2N-sao)6(6-atha)2(EtOH)6] [H2N-saoH = salicylamidoxime, 6-atha = 6-acetylthiohexanoate] complex that is attached to alkane tethers terminated with thiols. These Mn-based molecules were electrochemically bonded between the two Ni electrodes of an exposed-edge tunnel junction, which was produced by the lift-off method. The SMM-treated MTJ exhibited current enhancement and transitory current suppression at room temperature. Monte Carlo simulation was utilized to understand the transport properties of our molecular spintronics device. A device architecture utilizing a single-molecule magnet (SMM) as a device element between two ferromagnetic electrodes may open vast opportunities to create novel molecular spintronics devices.![]()
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Affiliation(s)
- Pawan Tyagi
- Department of Mechanical Engineering
- University of the District of Columbia
- Washington DC-20008
- USA
| | - Christopher Riso
- Department of Mechanical Engineering
- University of the District of Columbia
- Washington DC-20008
- USA
| | - Uzma Amir
- Department of Mechanical Engineering
- University of the District of Columbia
- Washington DC-20008
- USA
| | - Carlos Rojas-Dotti
- Instituto de Ciencia Molecular (ICMol)
- Universitat de València
- 46980 Paterna
- Spain
| | - Jose Martínez-Lillo
- Instituto de Ciencia Molecular (ICMol)
- Universitat de València
- 46980 Paterna
- Spain
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5
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Rojas-Dotti C, Moliner N, Lloret F, Martínez-Lillo J. Hexanuclear manganese(III) single-molecule magnets based on oxime and azole-type ligands. Polyhedron 2019. [DOI: 10.1016/j.poly.2019.05.044] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Kalofolias DA, Weselski M, Siczek M, Lis T, Tsipis AC, Tangoulis V, Milios CJ. Dinuclear and Mononuclear Rhenium Coordination Compounds upon Employment of a Schiff-Base Triol Ligand: Structural, Magnetic, and Computational Studies. Inorg Chem 2019; 58:8596-8606. [PMID: 31180213 DOI: 10.1021/acs.inorgchem.9b00886] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The 1:1 reaction of trans-[ReIIICl3(PPh3)2(MeCN)] with 2-(β-naphthalideneamino)-2-hydroxymethyl-1-propanol, H3L, in toluene gave the dinuclear complex [ReIII2Cl4(HL)(PPh3)]·2C7H8 (1·2C7H8), while the 1:2 reaction led to the formation of complex [ReIVCl2(HL)(PPh3)] (2). In both species, the Schiff-base ligand exists in its doubly deprotonated form, HL2-, forming chelate rings around the metallic centers. In addition, 1·2C7H8 displays a unique triple metal-to-metal bond between the two trivalent rhenium ions separated at a 2.229(1) Å bond distance, while in complex [ReIVCl2(HL)(PPh3)] (2) the two aromatic ligands, HL2- and PPh3, occupy axial positions, with the terminal Cl- ions in the trans position. Investigation of the magnetic properties revealed a Curie paramagnetic behavior ( S = 1/2) with a pronounced temperature independent paramagnetism (TIP) for 1·2C7H8 and 2. Both the geometry and the electronic structure of both compounds have been studied by means of density functional theory (DFT) calculations, confirming the triplet and doublet spin ground state of the complexes and furthermore establishing an electron-rich σ2π4δ1δ*1 bond order of 3 for 1·2C7H8. In addition, the absorption spectrum of 1·2C7H8 in CH2Cl2 was simulated by means of DFT calculations and is in excellent agreement with both the crystallographic and theoretical studies. Complex 1·2C7H8 is the first dinuclear rhenium complex with a triple metal-metal bond between trivalent rhenium centers.
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Affiliation(s)
| | - Marek Weselski
- Faculty of Chemistry , University of Wrocław , Joliot-Curie 14 , Wrocław 50-383 , Poland
| | - Milosz Siczek
- Faculty of Chemistry , University of Wrocław , Joliot-Curie 14 , Wrocław 50-383 , Poland
| | - Tadeusz Lis
- Faculty of Chemistry , University of Wrocław , Joliot-Curie 14 , Wrocław 50-383 , Poland
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Sanchis-Perucho A, Martínez-Lillo J. Ferromagnetic exchange interaction in a new Ir(iv)–Cu(ii) chain based on the hexachloroiridate(iv) anion. Dalton Trans 2019; 48:13925-13930. [DOI: 10.1039/c9dt02884f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The new chloro-bridged heterobimetallic IrIVCuII chain of formula {IrCl5(μ-Cl)Cu(viim)4}n [viim = 1-vinylimidazole] is the first reported compound based on the CuII and IrIV metal ions.
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Affiliation(s)
- Adrián Sanchis-Perucho
- Instituto de Ciencia Molecular (ICMol)/Departament de Química Inorgànica
- Universitat de València
- Paterna
- Spain
| | - José Martínez-Lillo
- Instituto de Ciencia Molecular (ICMol)/Departament de Química Inorgànica
- Universitat de València
- Paterna
- Spain
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8
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Ferromagnetic Oxime-Based Manganese(III) Single-Molecule Magnets with Dimethylformamide and Pyridine as Terminal Ligands. CRYSTALS 2018. [DOI: 10.3390/cryst9010023] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Two new members of the [Mn6] family of single-molecule magnets (SMMs) of formulae [Mn6(μ3-O)2(H2N-sao)6(dmf)8](ClO4)2 (1) and [Mn6(μ3-O)2(H2N-sao)6(py)6(EtOH)2][ReO4]2·4EtOH (2), (dmf = N,N′-dimethylformamide, py = pyridine, H2N-saoH2 = salicylamidoxime) have been synthesized and characterized structurally and magnetically. Both compounds were straightforwardly prepared from the deprotonation of the H2N-saoH2 ligand in the presence of the desired manganese salt and solvent (dmf (1) vs. py (2)). Compound 1 crystallizes in the triclinic system with space group Pī and 2 crystallizes in the monoclinic system with space group P21/n. In the crystal packing of 1 and 2, the (ClO4)− (1) and [ReO4]− (2) anions sit between the cationic [Mn6]2+ units, which are H-bonded to –NH2 groups from the salicylamidoxime ligands. The study of the magnetic properties of 1 and 2 revealed ferromagnetic coupling between the MnIII metal ions and the occurrence of slow relaxation of the magnetization, which is a typical feature of single-molecule magnet behavior. The cationic nature of these [Mn6]2+ species suggests that they could be used as suitable building blocks for preparing new magnetic materials exhibiting additional functionalities.
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Rojas-Dotti C, Moliner N, González R, Martínez-Lillo J. Ligand substitution in cis-bis(acetonitrile)tetrachlororhenium(IV) complex with N,N-dimethylformamide and N,N-dimethylacetamide. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.01.009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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10
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Rojas-Dotti C, Moliner N, González R, Martínez-Lillo J. Hexakis(dimethylformamide)iron(II) complex cation in hexahalorhenate(IV)-based salts: synthesis, X-ray structure and magnetic properties. J COORD CHEM 2018. [DOI: 10.1080/00958972.2017.1423477] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Carlos Rojas-Dotti
- Departament de Química Inorgànica/Instituto de Ciencia Molecular (ICMol), Universitat de València, Valencia, Spain
- Cátedra de Química Inorgánica, Facultad de Química, Departamento Estrella Campos, Universidad de la República, Montevideo, Uruguay
| | - Nicolás Moliner
- Departament de Química Inorgànica/Instituto de Ciencia Molecular (ICMol), Universitat de València, Valencia, Spain
| | - Ricardo González
- Cátedra de Química Inorgánica, Facultad de Química, Departamento Estrella Campos, Universidad de la República, Montevideo, Uruguay
| | - José Martínez-Lillo
- Departament de Química Inorgànica/Instituto de Ciencia Molecular (ICMol), Universitat de València, Valencia, Spain
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11
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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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12
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Pedersen AH, Geoghegan BL, Nichol GS, Lupton DW, Murray KS, Martínez-Lillo J, Gass IA, Brechin EK. Hexahalorhenate(iv) salts of metal oxazolidine nitroxides. Dalton Trans 2017; 46:5250-5259. [PMID: 28374882 DOI: 10.1039/c7dt00752c] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Eight coordination compounds of formulae [FeII(L˙)2][ReIVCl6] (1a), [FeII(L˙)2][ReIVBr6] (1b), [CoII(L˙)2][ReIVCl6]·CH3CN (2a), [CoII(L˙)2][ReIVBr6] (2b), [NiII(L˙)(CH3CN)3][ReIVCl6]·CH3CN (3a), [NiII(L˙)(CH3CN)3][ReIVBr6]·3CH3CN (3b), [CuII(L˙)2][ReIVCl6] (4a) and [CuII(L˙)2][ReIVBr6] (4b), where L˙ is the aminoxyl radical chelating ligand, 4,4'-dimethyl-2,2'-di(2-pyridyl)oxazolidine-N-oxide, have been synthesised. Structural and magnetic studies reveal metal-radical intramolecular antiferromagnetic interactions in the [MII(L˙)2]2+ cations in the iron, cobalt and copper based compounds (1a, 1b, 2a, 2b, 4a and 4b) with the central metal ion low-spin in the case of iron (1a and 1b) and a gradual, cobalt based, spin-crossover transition present in 2a and 2b. The nickel based compounds, 3a and 3b, were analysed in the dried form (3a(dried) and 3b(dried)) and directly in acetonitrile (3a(solvated) and 3b(solvated)). Microanalysis and IR spectroscopy on 3a(dried) and 3b(dried) suggest that the dried samples are best formulated as [NiII(L˙)(H2O)3][ReIVX6], where X = Cl (3a(dried)) and Br (3b(dried)). All forms of 3a and 3b exhibit cationic metal-radical ferromagnetic interactions resulting in S = 3/2 ground states. In addition, 3a(dried) exhibits spin-canting behaviour with an ordering temperature of 2.7 K, an open hysteresis loop with a coercive field Hc = 580 Oe, and a remanent magnetisation Mr = 0.21μB, resulting in a canting angle of ∼1.8°. In contrast, 3b(dried) shows no spin-canting behaviour; a maximum in χMvs. T at T = 3 K suggesting long-range antiferromagnetic ordering. 3a(solvated) and 3b(solvated) show no indication of long-range magnetic ordering, unlike 4a and 4b where anomalies are evident in the low-temperature magnetic susceptibility measurements.
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Affiliation(s)
- Anders H Pedersen
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, EH9 3FJ Edinburgh, Scotland, UK.
| | - Blaise L Geoghegan
- School of Pharmacy and Biomolecular Sciences, University of Brighton, Brighton BN2 4GJ, UK.
| | - Gary S Nichol
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, EH9 3FJ Edinburgh, Scotland, UK.
| | - David W Lupton
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Keith S Murray
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - José Martínez-Lillo
- Departament de Química Inorgànica/Instituto de Ciencia Molecular (ICMol), Universitat de València, C/Catedrático José Beltrán 2, 46980, Paterna (València), Spain.
| | - Ian A Gass
- School of Pharmacy and Biomolecular Sciences, University of Brighton, Brighton BN2 4GJ, UK.
| | - Euan K Brechin
- EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, EH9 3FJ Edinburgh, Scotland, UK.
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Pedersen AH, Julve M, Brechin EK, Martínez-Lillo J. Self-assembly of the tetrachlorido(oxalato)rhenate(iv) anion with protonated organic cations: X-ray structures and magnetic properties. CrystEngComm 2017. [DOI: 10.1039/c6ce02025a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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14
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Rojas-Dotti C, Martínez-Lillo J. Thioester-functionalised and oxime-based hexametallic manganese(iii) single-molecule magnets. RSC Adv 2017. [DOI: 10.1039/c7ra09841c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Two novel oxime-based hexametallic manganese(iii) single-molecule magnets have been thioester-functionalised and characterised structurally and magnetically.
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Affiliation(s)
- Carlos Rojas-Dotti
- Instituto de Ciencia Molecular (ICMol)
- Departament de Química Inorgànica
- Universitat de València
- Valencia
- Spain
| | - José Martínez-Lillo
- Instituto de Ciencia Molecular (ICMol)
- Departament de Química Inorgànica
- Universitat de València
- Valencia
- Spain
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15
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Wang JJ, Sun J, Yang M, Li LC. Tuning Magnetic Relaxation in a Tb-Nitronyl Nitroxide Complex by Using Cocrystalline Paramagnetic Complex. Inorg Chem 2015; 54:11307-13. [DOI: 10.1021/acs.inorgchem.5b01915] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Juan-Juan Wang
- Department
of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry
and Tianjin Key Laboratory of Metal and Molecule-based Material Chemistry, Nankai University, Tianjin 300071, China
| | - Juan Sun
- Department
of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry
and Tianjin Key Laboratory of Metal and Molecule-based Material Chemistry, Nankai University, Tianjin 300071, China
| | - Meng Yang
- Department
of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry
and Tianjin Key Laboratory of Metal and Molecule-based Material Chemistry, Nankai University, Tianjin 300071, China
| | - Li-Cun Li
- Department
of Chemistry, Key Laboratory of Advanced Energy Materials Chemistry
and Tianjin Key Laboratory of Metal and Molecule-based Material Chemistry, Nankai University, Tianjin 300071, China
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Gryca I, Palion-Gazda J, Machura B, Penkala M, Kruszyński R, Cano J, Lloret F, Julve M. Synthesis, crystal structure and magnetic properties of H2tppz[ReCl6] and [Cu(bpzm)2(μ-Cl)ReCl3(μ-ox)Cu(bpzm)2(μ-ox)ReCl3(μ-Cl)]n. Dalton Trans 2015; 44:17118-28. [PMID: 26369896 DOI: 10.1039/c5dt02522b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two new Re(iv) compounds of formulae H2tppz[ReCl6] (1) and [Cu(bpzm)2(μ-Cl)ReCl3(μ-ox)Cu(bpzm)2(μ-ox)ReCl3(μ-Cl)]n (2) [tppz = 2,3,5,6-tetrakis(2-pyridyl)pyrazine and bpzm = bis(pyrazolyl-1-yl)methane] have been prepared and their crystal structures determined by X-ray diffraction on single crystals. Compound 1 is a mononuclear species whose structure consists of octahedral hexachlororhenate(iv) anions and diprotonated H2tppz(2+) cations which are arranged in the unit cell as alternating anionic and cationic layers, held together by electrostatic forces. The structure of 2 is made up of alternating [Cu(1)(bpzm)2](2+) and [(ox)ReCl3(μ-Cl)Cu(2)(bpzm)2(μ-Cl)ReCl3(ox)](2-) entities interlinked by oxalate bridges to afford a neutral heterobimetallic chain. The oxalate group adopts the didentate (at Re)/monodentate (at Cu) bridging mode. The magnetic behavior of 1 and 2 has been investigated over the temperature range 1.9-295 K. 1 is a magnetically diluted Re(iv) complex, the relatively large value of the zero-field splitting of the ground level [D = -15.8(2) cm(-1)] accounting for the variation of χMT in the low temperature range. Weak intrachain ferromagnetic interactions between Re(iv) and Cu(ii) through oxalate (J1 = +0.15 cm(-1)) and single chloro (J2 = +4.9 cm(-1)) bridges occur in 2 which are obscured by the large zero-field splitting of the Re(iv) ion (DRe = 42 cm(-1)). In addition, interchain antiferromagnetic interactions are also involved in 2 which are responsible for the metamagnetic behavior observed, the value of the critical dc magnetic field (Hc) being 20 kOe.
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Affiliation(s)
- I Gryca
- Department of Crystallography, Institute of Chemistry, University of Silesia, 9th Szkolna St., 40-006 Katowice, Poland.
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