1
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Kant S, Saha S, Lloret F, Cano J, Mukherjee R. A tetracobalt(II) cluster with a two vertex truncated dicubane topology endogenously supported by carboxylate-based (2-pyridyl)methylamine ligands: magneto-structural and DFT studies. Dalton Trans 2023; 52:11922-11933. [PMID: 37574905 DOI: 10.1039/d3dt01131c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/15/2023]
Abstract
A reaction between CoCl2 and L3-(CO2-)2 (2 : 1 stoichiometry) in CH3OH affords a discrete complex [CoII4-{L3-(CO2-)2}2(μ3-OCH3)2(CH3OH)2(H2O)2Cl2] (1) [L3-(CO2-)2 = 3-[N-{2-(pyridin-2-yl)methyl}amino]-bis(propionate)]. The structure of 1 reveals two terminal mononuclear CoII{L3-(CO2-)2}Cl units connected by a dimeric CoII2(μ3-OCH3)2(CH3OH)2(H2O) unit present in the centre through two methoxo (μ3-OCH3)- and two carboxylate (μ-1,1-OCO-) bridges affording a tetranuclear coordination cluster of Co(II) with a defective dicubane topology. In 1, Co1 (terminal) has distorted octahedral CoIIN2O3Cl and the central Co2 has CoIIO6 coordination. Such coordination arrangements afford the observed topology. Variable-temperature magnetic studies reveal anti-ferromagnetic coupling in 1. Three magnetic exchange interactions (one anti-ferromagnetic and two ferromagnetic: J1 = +3.3 cm-1 (Co⋯Co 3.176 Å; μ-1,1-OCO- and μ3-OCH3 bridges), J2 = -2.5 cm-1 (Co⋯Co 3.228 Å; μ-1-OCO- and μ3-OCH3 bridges) and J3 = +10.6 cm-1 (Co⋯Co 3.084 Å; two μ3-OCH3 bridges)) have been identified, with the inclusion of the orbital reduction parameter (α = Aκ = 1.38), spin-orbit coupling (λ = -158 cm-1) and axial distortion (energy gap Δ = -975 cm-1 between singlet and doublet levels), rationalized by density functional theory (DFT) calculations.
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Affiliation(s)
- Shashi Kant
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208016, India.
- Department of Chemistry, Bhola Prasad Singh College, Bhore, Gopalganj (Jai Prakash University Chapra), Bihar 841426, India
| | - Sayan Saha
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208016, India.
| | - Francesc Lloret
- Departament de Química Inorgànica/Instituto de Ciencia Molecular (ICMOL), Universitat de València, Polígono de la Coma, s/n, 46980 Paterna, València, Spain
| | - Joan Cano
- Instituto de Ciencia Molecular/Departament de Química Inorgànica, Universitat de València, C/Catedrático José Beltrán 2, 46980 Paterna, València, Spain.
| | - Rabindranath Mukherjee
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208016, India.
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2
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Parreiras J, Faria EN, Oliveira WXC, Pinheiro CB, do Pim WD, da Silva Júnior EN, Pedroso EF, Julve M, Pereira CLM. X-ray structure and magnetic properties of a mononuclear complex and a 1D coordination polymer assembled by cobalt(II) ions and a flexible oxamate ligand. J COORD CHEM 2022. [DOI: 10.1080/00958972.2022.2135436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Julia Parreiras
- Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Erica N. Faria
- Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Willian X. C. Oliveira
- Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Carlos B. Pinheiro
- Departamento de Física, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Walace D. do Pim
- Departamento de Química, Centro Federal de Educação Tecnológica de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Eufrânio N. da Silva Júnior
- Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Emerson F. Pedroso
- Departamento de Química, Centro Federal de Educação Tecnológica de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Miguel Julve
- Instituto de Ciencia Molecular/Departament de Química Inorgànica, Universitat de València, Paterna, València, Spain
| | - Cynthia L. M. Pereira
- Departamento de Química, Instituto de Ciências Exatas, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
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3
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Zorina-Tikhonova EN, Matyukhina AK, Chistyakov AS, Vologzhanina AV, Korlyukov AA, Gogoleva NV, Novikova VA, Belova EV, Ugolkova EA, Starikova AA, Korchagin DV, Babeshkin KA, Efimov NN, Kiskin MA, Eremenko IL. Synthesis, structure, magnetic properties and thermal behaviour of Ba–M II (M II = Mn, Co, Cu, and Zn) allylmalonates. NEW J CHEM 2022. [DOI: 10.1039/d2nj03751c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A series of Ba-MII complexes with allylmalonic acid anions [BaMII(Amal)2(H2O)3]n (MII = Mn, Co, Cu, and Zn) were synthesized. The magnetic measurements revealed slow magnetic relaxation in non-zero field (HDC = 1500 Oe) for CoII ions.
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Affiliation(s)
- Ekaterina N. Zorina-Tikhonova
- N.S. Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, Leninsky Prosp. 31, 119991 Moscow, Russian Federation
| | - Anna K. Matyukhina
- N.S. Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, Leninsky Prosp. 31, 119991 Moscow, Russian Federation
| | - Aleksandr S. Chistyakov
- N.S. Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, Leninsky Prosp. 31, 119991 Moscow, Russian Federation
| | - Anna V. Vologzhanina
- A.N. Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences, Vavilova str. 28, 119334 Moscow, Russian Federation
| | - Alexander A. Korlyukov
- A.N. Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences, Vavilova str. 28, 119334 Moscow, Russian Federation
| | - Natalia V. Gogoleva
- N.S. Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, Leninsky Prosp. 31, 119991 Moscow, Russian Federation
| | - Veronika A. Novikova
- N.S. Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, Leninsky Prosp. 31, 119991 Moscow, Russian Federation
- Chemistry Department, Lomonosov Moscow State University, Leninsky gory, 1-3, 1119991 Moscow, Russian Federation
| | - Ekaterina V. Belova
- Chemistry Department, Lomonosov Moscow State University, Leninsky gory, 1-3, 1119991 Moscow, Russian Federation
| | - Elena A. Ugolkova
- N.S. Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, Leninsky Prosp. 31, 119991 Moscow, Russian Federation
| | - Alyona A. Starikova
- Institute of Physical and Organic Chemistry, Southern Federal University, prosp. Stachki 194/2, Rostov-on-Don 344090, Russian Federation
| | - Denis V. Korchagin
- Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry, Ac. Semenov prosp. 1, Chernogolovka, Moscow region 142432, Russian Federation
| | - Konstantin A. Babeshkin
- N.S. Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, Leninsky Prosp. 31, 119991 Moscow, Russian Federation
| | - Nikolay N. Efimov
- N.S. Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, Leninsky Prosp. 31, 119991 Moscow, Russian Federation
| | - Mikhail A. Kiskin
- N.S. Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, Leninsky Prosp. 31, 119991 Moscow, Russian Federation
| | - Igor L. Eremenko
- N.S. Kurnakov Institute of General and Inorganic Chemistry of the Russian Academy of Sciences, Leninsky Prosp. 31, 119991 Moscow, Russian Federation
- A.N. Nesmeyanov Institute of Organoelement Compounds of the Russian Academy of Sciences, Vavilova str. 28, 119334 Moscow, Russian Federation
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Alexandru MG, Visinescu D, Cula B, Shova S, Rabelo R, Moliner N, Lloret F, Cano J, Julve M. A rare isostructural series of 3d-4f cyanido-bridged heterometallic squares obtained by assembling [Fe III{HB(pz) 3}(CN) 3] - and Ln III ions: synthesis, X-ray structure and cryomagnetic study. Dalton Trans 2021; 50:14640-14652. [PMID: 34581372 DOI: 10.1039/d1dt02512k] [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
A new series of cyanido-bridged {FeIIILnIII}2 neutral molecular squares of general formula [Fe{HB(pz)3}(CN)(μ-CN)2Ln(NO3)2(pyim)(Ph3PO)]2·2CH3CN [Ln = Ce (1), Pr (2), Nd (3), Gd (4), Tb (5), Dy (6) and Er (7); {HB(pz)3}- = hydrotris(pyrazolyl)borate, pyim = 2-(1H-imidazol-2-yl)pyridine and Ph3PO = triphenylphosphine oxide] were obtained by reacting the low-spin [Fe{HB(pz)3}(CN)3]- species with the preformed [LnIII(pyim)(NO3)2(pyim)(Ph3PO)]+ complex anions (generated in situ by mixing the nitrate salt of each Ln(III) ion with pyim and Ph3PO molecules). Single-crystal X-ray diffraction studies show that 1-7 are isostructural compounds that crystallize in the triclinic P1̄ space group. Their crystal structures consist of centrosymmetric cyanido-bridged {FeIIILnIII}2 molecular squares where two [Fe{HB(pz)3}(CN)3]- units adopt bis-monodentate coordination modes towards two [LnIII(pyim)(NO3)2(pyim)(Ph3PO)]+ moieties. The cis-oriented convergent sites from both low-spin FeIII and LnIII fragments form a quasi square-shaped molecule in which the 3d and 4f ions alternatively occupy the corners of the square. Both FeIII ions show a distorted octahedral surrounding (C3v symmetry), whereas the LnIII ions exhibit a distorted muffin-like geometry (Cs symmetry) in 1-7. The intramolecular FeIII⋯LnIII distances across the two cyanido-bridges range from ca. 5.48/5.46 up to ca. 5.58/5.61 Å. The molecular squares in 1-7 are interlinked through hydrogen bonds, weak π⋯π stacking and very weak C-H⋯π type interactions into three-dimensional supramolecular networks. The analysis of the solid-state direct-current (dc) magnetic susceptibility data of 1-7 in the temperature range 1.9-300 K reveals the occurrence of weak intra- and intermolecular antiferromagnetic interactions. The small intramolecular antiferromagnetic couplings in 4 compare well with those previously reported for parent systems. Although the coexistence of the spin-orbit coupling (SOC) of the low-spin iron(III) and lanthanide(III) ions in the remaining compounds together with the ligand field effects mask the visualization and make difficult the evaluation of the possible magnetic interactions in them, we were able to do it through a SOC model applied on exact or effective Hamiltonians. Frequency-dependent alternating current magnetic susceptibility signals in the temperature range 2.0-9.0 K under zero and non-zero static fields were observed for 5-7 which indicate slow magnetic relaxation (SMM) behavior. The usual absence of χ''M maxima moved us to estimate their energy barriers through ln(χ''M/ χ'M) vs. 1/T plots, obtaining values from 25 to 40 cm-1.
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Affiliation(s)
- Maria-Gabriela Alexandru
- Department of Inorganic Chemistry, Physical Chemistry and Electrochemistry, Faculty of Applied Chemistry and Materials Science, University Politehnica of Bucharest, 1-7 Gh. Polizu Street, 011061 Bucharest, Romania
| | - Diana Visinescu
- Coordination and Supramolecular Chemistry Laboratory, "Ilie Murgulescu" Institute of Physical Chemistry, Romanian Academy, Splaiul Independentei 202, Bucharest 060021, Romania.
| | - Beatrice Cula
- Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Str. 2, 12489 Berlin, Germany
| | - Sergiu Shova
- "Petru Poni" Institute of Macromolecular Chemistry, Ro, an Academy, mani, Aleea Grigore Ghica Vodă 41-A, RO-700487 Iasi, Romania
| | - Renato Rabelo
- Departament de Química Inorgànica/Instituto de Ciencia Molecular, Universitat de València, C/Catedrático José Beltrán 2, 46980 Paterna, València, Spain.
| | - Nicolás Moliner
- Departament de Química Inorgànica/Instituto de Ciencia Molecular, Universitat de València, C/Catedrático José Beltrán 2, 46980 Paterna, València, Spain.
| | - Francesc Lloret
- Departament de Química Inorgànica/Instituto de Ciencia Molecular, Universitat de València, C/Catedrático José Beltrán 2, 46980 Paterna, València, Spain.
| | - Joan Cano
- Departament de Química Inorgànica/Instituto de Ciencia Molecular, Universitat de València, C/Catedrático José Beltrán 2, 46980 Paterna, València, Spain.
| | - Miguel Julve
- Departament de Química Inorgànica/Instituto de Ciencia Molecular, Universitat de València, C/Catedrático José Beltrán 2, 46980 Paterna, València, Spain.
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