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Mandal S, Pramanik A, Dey S, Carrella LM, Rajaraman G, Rentschler E, Mohanta S. Experimental and theoretical investigations on three Dy III4 single molecule magnets: structural and magneto-structural correlations. Dalton Trans 2022; 51:14753-14766. [PMID: 36106563 DOI: 10.1039/d2dt02348b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The work in this report describes the syntheses, crystal structures, dc/ac magnetic behaviour, and theoretical calculations (both ab initio CASSCF and DFT) of three defect dicubane/planar butterfly type tetradysprosium(III) compounds of compositions [DyIII4L4(μ3-OH)2(carboxylate)2(dmf)2] (carboxylate = formate (1), acetate (2), propionate (3)), where H2L = 2-(2-hydroxy-3-ethoxybenzylideneamino)phenol. In the butterfly type structures, two DyIII centres (Dyb) occupy the body positions while two other (Dyw) units occupy the wing positions. SHAPE analyses reveal that the coordination geometries of the Dyb and Dyw centres, both octacoordinated, are triangular dodecahedron (TDD) and square antiprism (SAPR), respectively. Variable-temperature magnetic susceptibility measurements give an indication of weak antiferromagnetic interactions and variable-field magnetization measurements reveal strong anisotropy in all the three compounds. The variable-temperature/frequency in-phase/out-of-phase AC susceptibility data reveal that all these three compounds are SMMs with two relaxation channels under zero dc field; slow relaxation (SR) and fast relaxation (FR) processes could be assigned to the SAPR (Dyw) and TDD (Dyb) metal centres, respectively. The simulated Ueff and τ0 values are: 49.0 cm-1 and 1.76 × 10-7 s for 1, 30.3 cm-1 and 1.51 × 10-8 s for 2 and 23.4 cm-1 and 9.64 × 10-7 s for 3. Furthermore, ab initio CASSCF/RASSI-SO/SINGLE_ANISO calculations reveal that the ground state of DyIII centres are axial in nature with a dominating contribution from mJ = |±15/2>. The magnetization relaxation occurs via the first excited KD resulting in the large computed blocking barrier of Dyw (SAPR) centres compared to that of the Dyb (TDD) centres which corroborates the experimental measurements. The exchange parameters obtained from DFT calculations are generally in line with those obtained from the fitting of χMT vs. T in POLY_ANISO calculations. Interesting structural and magneto-structural correlations have been found, which are the major outcomes of this investigation.
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Affiliation(s)
- Shuvankar Mandal
- Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Kolkata 700 009, India.
| | - Abhishek Pramanik
- Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Kolkata 700 009, India.
| | - Sourav Dey
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India.
| | - Luca M Carrella
- Department of Chemistry, Johannes-Gutenberg University Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany.
| | - Gopalan Rajaraman
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India.
| | - Eva Rentschler
- Department of Chemistry, Johannes-Gutenberg University Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany.
| | - Sasankasekhar Mohanta
- Department of Chemistry, University of Calcutta, 92 A. P. C. Road, Kolkata 700 009, India.
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Gebrezgiabher M, Schlittenhardt S, Rajnák C, Kuchár J, Sergawie A, Černák J, Ruben M, Thomas M, Boča R. Triangulo-{Er III 3} complex showing field supported slow magnetic relaxation. RSC Adv 2022; 12:21674-21680. [PMID: 35975040 PMCID: PMC9350813 DOI: 10.1039/d2ra04328a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Accepted: 07/18/2022] [Indexed: 11/01/2022] Open
Abstract
The triangulo-{Er3} complex [Er3Cl(o-van)3(OH)2(H2O)5]Cl3·nH2O (n = 9.4; H(o-van) = o-vanillin) (1) was generated by an in situ method. The isolated Er(iii) complex 1 was characterized by elemental analysis and molecular spectroscopy. The results of single crystal X-ray diffraction studies have shown that 1 is built up of trinuclear [Er3Cl(o-van)3(OH)2(H2O)5]3+ complex cations, chloride anions and water solvate molecules. Within the complex cation the three Er(iii) central atoms are placed at the apexes of a triangle which are bridged by three (o-van)- ligands with additional chelating functions and two μ3-OH- ligands. Additionally five aqua and one chlorido ligands complete the octa-coordination of the three Er(iii) atoms. AC susceptibility measurements reveal that the compound exhibits slow magnetic relaxation with two relaxation modes.
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Affiliation(s)
- Mamo Gebrezgiabher
- Department of Industrial Chemistry, College of Applied Sciences, Nanotechnology Excellence Center, Addis Ababa Science and Technology University Addis Ababa P.O. Box 16417 Ethiopia .,Department of Chemistry, Faculty of Natural Sciences, University of SS Cyril and Methodius 91701 Trnava Slovakia
| | - Sören Schlittenhardt
- Institute of Nanotechnology, Karlsruhe Institute of Technology Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
| | - Cyril Rajnák
- Department of Chemistry, Faculty of Natural Sciences, University of SS Cyril and Methodius 91701 Trnava Slovakia
| | - Juraj Kuchár
- Department of Inorganic Chemistry, Institute of Chemistry, P. J. Šafárik University in Košice 041 80 Košice Slovakia
| | - Assefa Sergawie
- Department of Industrial Chemistry, College of Applied Sciences, Nanotechnology Excellence Center, Addis Ababa Science and Technology University Addis Ababa P.O. Box 16417 Ethiopia
| | - Juraj Černák
- Department of Inorganic Chemistry, Institute of Chemistry, P. J. Šafárik University in Košice 041 80 Košice Slovakia
| | - Mario Ruben
- Institute of Nanotechnology, Karlsruhe Institute of Technology Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany.,Institute of Quantum Materials and Technologies (IQMT, ), Karlsruhe Institute of Technology Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany.,Centre Européen de Science Quantique (CESQ), Institut de Science et d'Ingénierie Supramoléculaires (ISIS, UMR 7006), CNRS-Université de Strasbourg 8 allée Gaspard Monge BP 70028 67083 Strasbourg Cedex France
| | - Madhu Thomas
- Department of Industrial Chemistry, College of Applied Sciences, Nanotechnology Excellence Center, Addis Ababa Science and Technology University Addis Ababa P.O. Box 16417 Ethiopia
| | - Roman Boča
- Department of Chemistry, Faculty of Natural Sciences, University of SS Cyril and Methodius 91701 Trnava Slovakia
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New Heterotrinuclear Cu IILn IIICu II (Ln = Ho, Er) Compounds with the Schiff Base: Syntheses, Structural Characterization, Thermal and Magnetic Properties. MATERIALS 2022; 15:ma15124299. [PMID: 35744355 PMCID: PMC9231215 DOI: 10.3390/ma15124299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Revised: 06/09/2022] [Accepted: 06/15/2022] [Indexed: 02/04/2023]
Abstract
New heterotrinuclear complexes with the general formula [Cu2Ln(H2L)(HL)(NO3)2]·MeOH (Ln = Ho (1), Er (2), H4L = N,N′-bis(2,3-dihydroxybenzylidene)-1,3-diaminopropane) were synthesized using compartmental Schiff base ligand in conjugation with auxiliary ligands. The compounds were characterized by elemental analysis, ATR-FTIR spectroscopy, X-ray diffraction, TG, DSC, TG-FTIR and XRD analysis. The N2O4 salen-type ligand coordinates 3d and 4f metal centers via azomethine nitrogen and phenoxo oxygen atoms, respectively, to form heteropolynuclear complexes having CuO2Ln cores. In the crystals 1 and 2, two terminal Cu(II) ions are penta-coordinated with a distorted square-pyramidal geometry and a LnIII ion with trigonal dodecahedral geometry is coordinated by eight oxygen atoms from [CuII(H2L)(NO3)]− and [CuII(HL)(NO3)]2− units. Compounds 1 and 2 are stable at room temperature. During heating, they decompose in a similar way. In the first decomposition step, they lose solvent molecules. The exothermic decomposition of ligands is connected with emission large amounts of gaseous products e.g., water, nitric oxides, carbon dioxide, carbon monoxide. The final solid products of decomposition 1 and 2 in air are mixtures of CuO and Ho2O3/Er2O3. The measurements of magnetic susceptibilities and field dependent magnetization indicate the ferromagnetic interaction between CuII and HoIII ions 1.
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Abstract
A tetranuclear dysprosium Schiff base complex was isolated by reacting dysprosium chloride with 2-hydroxy-3-methoxybenzaldehyde and 2-(aminomethyl)pyridine in-situ under basic conditions. The isolated Dy(III) complex was characterized by elemental analyses, single crystal X-ray diffraction and molecular spectroscopy. The complex crystallizes in the triclinic space group P-1 with unit cell parameters of a = 10.2003 (4), b = 13.8602 (5), c = 14.9542 (6), α = 94.523 (3), β = 109.362 (4), and γ = 99.861 (3). The magnetic properties of 1 have been investigated by DC and AC susceptibility measurements. The DC measurements reveal weak exchange coupling of antiferromagnetic nature. In the AC measurement, the complex shows a slow relaxation of magnetization in the absence of an external magnetic field.
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5
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Dais TN, Takano R, Ishida T, Plieger PG. Self-assembly of non-macrocyclic triangular Ni 3Ln clusters. Dalton Trans 2022; 51:1446-1453. [PMID: 34985086 DOI: 10.1039/d1dt03742k] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis and structural characterisation of four new heterometallic tetranuclear complexes is reported. Three L3Ni3Ln type complexes, where Ln = La (C1), Eu (C2), and Gd (C3), have been fully characterised including DC and AC magnetic measurements. A fourth complex featuring a diamagnetic BaII ion at its centre is also reported with structural characterisation. Structural elucidation showed that all four complexes successfully self-assembled from a stoichiometric mixture of the acyclic ligand, 1,4-diformylnaphthalene-2,3-diol, with nickel(II) nitrate and the appropriate heavy metal salt to produce the same near planar Ni3MO12 core. Ferromagnetic interactions were found to dominate the ground state of C3, exhibiting a maximal spin ground state of 13/2. The exchange coupling is quantitatively discussed along with the nickel(II) zero-field splitting effect. AC magnetic susceptibility experiments were carried out, but no frequency dependent signals were observed and thus no observable slow relaxation of magnetisation.
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Affiliation(s)
- Tyson N Dais
- School of Fundamental Sciences, Massey University, Private Bag 11 222, Palmerston North, New Zealand.
| | - Rina Takano
- Department of Engineering Science, Graduate School of Informatics and Engineering, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan
| | - Takayuki Ishida
- Department of Engineering Science, Graduate School of Informatics and Engineering, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan
| | - Paul G Plieger
- School of Fundamental Sciences, Massey University, Private Bag 11 222, Palmerston North, New Zealand.
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6
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Gebrezgiabher M, Schlittenhardt S, Rajnák C, Kuchár J, Sergawie A, Černák J, Ruben M, Thomas M, Boca R. Dinuclear Dysprosium Schiff base complex showing slow magnetic relaxation in the absence of an external magnetic field. NEW J CHEM 2022. [DOI: 10.1039/d2nj02591d] [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 dinuclear dysprosium(III) complex [Dy2(NO3)3(L)3]•nCH3OH (n = 1.20; HL = (2-[(2-hydroxy-propylimino)methyl]phenol)) (1) was isolated when the dysprosium nitrate reacted with a solution of salicylaldehyde and 1-amino-2-propanol in basic medium under...
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7
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Hazra S, Karmakar A, da Silva MFCG, Pombeiro AJ. Alkoxo bridged heterobimetallic CoIIISnIV compounds with face shared coordination octahedra: Synthesis, crystal structure and cyanosilylation catalysis. J Organomet Chem 2021. [DOI: 10.1016/j.jorganchem.2021.121949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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9
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A Mixed Valence Co IICo III2 Field-Supported Single Molecule Magnet: Solvent-Dependent Structural Variation. Molecules 2021; 26:molecules26041060. [PMID: 33670480 PMCID: PMC7922140 DOI: 10.3390/molecules26041060] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Revised: 02/10/2021] [Accepted: 02/14/2021] [Indexed: 11/25/2022] Open
Abstract
One-pot reaction of the Schiff base N,N’-ethylene bis(salicylaldimine) (H2L), CoCl2.6H2O, and [Ph2SnCl2] in acetone produces the mixed valence CoIICoIII2 compound [CoIICoIII2(μ-L)2(Ph)2(μ-Cl)2]·(CH3)2CO·H2O (1). Our recent study already revealed that the same reaction mixtures in methanol or ethanol produced a heterometallic SnIVCoIII (2) or monometallic CoIII complex (3), respectively. Comparison of these organometallic systems shows that the 2,1-intermetallic Ph shift occurs in any of those solvents, but their relevant structural features (mononuclear, dinuclear-heterometallic, and trinuclear mixed valence) are solvent dependent. Geometrical structural rotation is also discussed among the related organometallic CoIICoIII2 systems. The AC magnetic susceptibility measurements indicate that 1 is a single molecule magnet (SMM), exhibiting a field-induced slow magnetic relaxation with two modes. The relaxation time for the low-frequency channel is as slow as τ~0.6 s at T = 2.0 K and BDC = 1.0 T.
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10
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Wu J, Yang Q, Wang H, Ge Y, Tang J, Qi Z. Single-molecule magnets under dc field with an anion effect: self-assembly of pure dysprosium(iii) metallacycles. Dalton Trans 2021; 50:262-269. [DOI: 10.1039/d0dt02869j] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The anion-adaptive self-assembly described here not only offers a facile approach to produce large single-molecule magnets but also provides an understanding of how structural factors affect the magnetic properties.
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Affiliation(s)
- Jianfeng Wu
- Sino-German Joint Research Lab for Space Biomaterials and Translational Technology
- Synergetic Innovation Center of Biological Optoelectronics and Healthcare Engineering (BOHE)
- Shaanxi Provincial Synergistic Innovation Center for Flexible Electronics & Health Sciences (FEHS)
- School of Life Sciences
- Northwestern Polytechnical University
| | - Qianqian Yang
- State Key Laboratory of Rare Earth Resource Utilization
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- P. R. China
| | - Haoyu Wang
- Sino-German Joint Research Lab for Space Biomaterials and Translational Technology
- Synergetic Innovation Center of Biological Optoelectronics and Healthcare Engineering (BOHE)
- Shaanxi Provincial Synergistic Innovation Center for Flexible Electronics & Health Sciences (FEHS)
- School of Life Sciences
- Northwestern Polytechnical University
| | - Yan Ge
- Sino-German Joint Research Lab for Space Biomaterials and Translational Technology
- Synergetic Innovation Center of Biological Optoelectronics and Healthcare Engineering (BOHE)
- Shaanxi Provincial Synergistic Innovation Center for Flexible Electronics & Health Sciences (FEHS)
- School of Life Sciences
- Northwestern Polytechnical University
| | - Jinkui Tang
- State Key Laboratory of Rare Earth Resource Utilization
- Changchun Institute of Applied Chemistry
- Chinese Academy of Sciences
- Changchun 130022
- P. R. China
| | - Zhenhui Qi
- Sino-German Joint Research Lab for Space Biomaterials and Translational Technology
- Synergetic Innovation Center of Biological Optoelectronics and Healthcare Engineering (BOHE)
- Shaanxi Provincial Synergistic Innovation Center for Flexible Electronics & Health Sciences (FEHS)
- School of Life Sciences
- Northwestern Polytechnical University
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11
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Ghorai P, Brandão P, Benmansour S, García CJG, Saha A. Azido and thiocyanato bridged dinuclear Ni(II) complexes involving 8-aminoquinoline based Schiff base as blocking ligands: Crystal structures, ferromagnetic properties and magneto-structural correlations. Polyhedron 2020. [DOI: 10.1016/j.poly.2020.114708] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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12
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Gálico DA, Marin R, Brunet G, Errulat D, Hemmer E, Sigoli FA, Moilanen JO, Murugesu M. Triplet‐State Position and Crystal‐Field Tuning in Opto‐Magnetic Lanthanide Complexes: Two Sides of the Same Coin. Chemistry 2019; 25:14625-14637. [DOI: 10.1002/chem.201902837] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2019] [Revised: 07/31/2019] [Indexed: 12/13/2022]
Affiliation(s)
- Diogo A. Gálico
- Department of Chemistry and Biomolecular Sciences University of Ottawa Ottawa Ontario K1N 6N5 Canada
- Institute of Chemistry University of Campinas UNICAMP, P.O. Box 6154 Campinas Sao Paulo 13083-970 Brazil
| | - Riccardo Marin
- Department of Chemistry and Biomolecular Sciences University of Ottawa Ottawa Ontario K1N 6N5 Canada
| | - Gabriel Brunet
- Department of Chemistry and Biomolecular Sciences University of Ottawa Ottawa Ontario K1N 6N5 Canada
| | - Dylan Errulat
- Department of Chemistry and Biomolecular Sciences University of Ottawa Ottawa Ontario K1N 6N5 Canada
| | - Eva Hemmer
- Department of Chemistry and Biomolecular Sciences University of Ottawa Ottawa Ontario K1N 6N5 Canada
| | - Fernando A. Sigoli
- Institute of Chemistry University of Campinas UNICAMP, P.O. Box 6154 Campinas Sao Paulo 13083-970 Brazil
| | - Jani O. Moilanen
- Department of Chemistry, Nanoscience Centre University of Jyväskylä, P.O. Box 35 40014 Jyväskylä Finland
| | - Muralee Murugesu
- Department of Chemistry and Biomolecular Sciences University of Ottawa Ottawa Ontario K1N 6N5 Canada
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Mandal S, Majumder S, Mohanta S. Syntheses, Crystal Structures and Experimental/Theoretical Magnetic Properties of Two Butterfly Ni
II
2
Y
III
2
Compounds. ChemistrySelect 2019. [DOI: 10.1002/slct.201902302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Shuvankar Mandal
- Department of ChemistryInorganic Chemistry SectionUniversity of Calcutta 92 A. P. C Road Kolkata 700 009 India
| | - Samit Majumder
- Department of ChemistryBhairab Ganguly College,2 Feeder Road,Belghoria, Kolkata West Bengal 700056 India
| | - Sasankasekhar Mohanta
- Department of ChemistryInorganic Chemistry SectionUniversity of Calcutta 92 A. P. C Road Kolkata 700 009 India
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14
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Roy S, Hari N, Mohanta S. Synthesis, Crystal Structures, Magnetic Properties, and Fluorescence of Two Heptanuclear Co
III
4
Ln
III
3
Compounds (Ln = Gd
III
, Dy
III
): Multiple Relaxation Dynamics in the Dy
III
Analogue. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900383] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Shuvayan Roy
- Department of Chemistry Inorganic Chemistry Section University of Calcutta 92 A. P. C Road 700 009 Kolkata India
| | - Nairita Hari
- Department of Chemistry Inorganic Chemistry Section University of Calcutta 92 A. P. C Road 700 009 Kolkata India
| | - Sasankasekhar Mohanta
- Department of Chemistry Inorganic Chemistry Section University of Calcutta 92 A. P. C Road 700 009 Kolkata India
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15
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Majumdar D, Dey S, Sreejith S, Biswas JK, Mondal M, Shukla P, Das S, Pal T, Das D, Bankura K, Mishra D. Syntheses, crystal structures and photo physical aspects of azido-bridged tetranuclear cadmium (II) complexes: DFT/TD-DFT, thermal, antibacterial and anti-biofilm properties. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2018.11.010] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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16
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Syntheses, Structures, and Catalytic Hydrocarbon Oxidation Properties of N-Heterocycle-Sulfonated Schiff Base Copper(II) Complexes. INORGANICS 2019. [DOI: 10.3390/inorganics7020017] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Reaction of the o-[(o-hydroxyphenyl)methylideneamino]benzenesulfonic acid (H2L) (1) with CuCl2·2H2O in the presence of pyridine (py) leads to [Cu(L)(py)(EtOH)] (2) which, upon further reaction with 2,2’-bipyridine (bipy), pyrazine (pyr), or piperazine (pip), forms [Cu(L)(bipy)]·MeOH (3), [Cu2(L)2(μ-pyr)(MeOH)2] (4), or [Cu2(L)2(μ-pip)(MeOH)2] (5), respectively. The Schiff base (1) and the metal complexes (2–5) are stabilized by a number of non-covalent interactions to form interesting H-bonded multidimensional polymeric networks (except 3), such as zigzag 1D chain (in 1), linear 1D chain (in 2), hacksaw double chain 1D (in 4) and 2D motifs (in 5). These copper(II) complexes (2–5) catalyze the peroxidative oxidation of cyclic hydrocarbons (cyclooctane, cyclohexane, and cyclohexene) to the corresponding products (alcohol and ketone from alkane; alcohols, ketone, and epoxide from alkene), under mild conditions. For the oxidation of cyclooctane with hydrogen peroxide as oxidant, used as a model reaction, the best yields were generally achieved for complex 3 in the absence of any promoter (20%) or in the presence of py or HNO3 (26% or 30%, respectively), whereas 2 displayed the highest catalytic activity in the presence of HNO3 (35%). While the catalytic reactions were significantly faster with py, the best product yields were achieved with the acidic additive.
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Dolai M, Ali M, Rajnák C, Titiš J, Boča R. Slow magnetic relaxation in Cu(ii)–Eu(iii) and Cu(ii)–La(iii) complexes. NEW J CHEM 2019. [DOI: 10.1039/c9nj02039j] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A dinuclear [(H2O)Cu(HLN2O2)Eu(NO3)3] complex exhibits paramagnetic behaviour with S = 1/2 ground state. At low temperature it displays slow magnetic relaxation that is supported by a small external magnetic field.
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Affiliation(s)
- Malay Dolai
- Department of Chemistry
- Jadavpur University
- Kolkata 700 032
- India
| | - Mahammad Ali
- Department of Chemistry
- Jadavpur University
- Kolkata 700 032
- India
| | - Cyril Rajnák
- Department of Chemistry
- Faculty of Natural Sciences
- University of SS Cyril and Methodius
- 91701 Trnava
- Slovakia
| | - Ján Titiš
- Department of Chemistry
- Faculty of Natural Sciences
- University of SS Cyril and Methodius
- 91701 Trnava
- Slovakia
| | - Roman Boča
- Department of Chemistry
- Faculty of Natural Sciences
- University of SS Cyril and Methodius
- 91701 Trnava
- Slovakia
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18
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Vráblová A, Tomás M, Falvello LR, Dlháň Ľ, Titiš J, Černák J, Boča R. Slow magnetic relaxation in Ni–Ln (Ln = Ce, Gd, Dy) dinuclear complexes. Dalton Trans 2019; 48:13943-13952. [DOI: 10.1039/c9dt02122a] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Unusual magnetic behaviour is observed in compounds with three Cl ligands in fac-mode coordination to dysprosium, cerium and even gadolinium.
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Affiliation(s)
- Anna Vráblová
- Department of Inorganic Chemistry
- Institute of Chemistry
- P. J. Šafárik University in Košice
- Košice
- Slovakia
| | - Milagros Tomás
- Centro de Quimica y Materiales de Aragón (CEQMA-ISQCH)
- Departamento de Química Inorgánica
- Pedro Cerbuna 12
- University of Zaragoza–CSIC
- E-50009 Zaragoza
| | - Larry R. Falvello
- Instituto de Ciencia de Materiales de Aragón (ICMA)
- Departamento de Química Inorgánica
- University of Zaragoza–CSIC
- E-50009 Zaragoza
- Spain
| | - Ľubor Dlháň
- Institute of Inorganic Chemistry
- Slovak University of Technology
- 812 37 Bratislava
- Slovakia
| | - Ján Titiš
- Department of Chemistry
- FPV
- University of SS Cyril and Methodius
- 917 01 Trnava
- Slovakia
| | - Juraj Černák
- Department of Inorganic Chemistry
- Institute of Chemistry
- P. J. Šafárik University in Košice
- Košice
- Slovakia
| | - Roman Boča
- Department of Chemistry
- FPV
- University of SS Cyril and Methodius
- 917 01 Trnava
- Slovakia
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19
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Maity S, Mondal A, Konar S, Ghosh A. The role of 3d–4f exchange interaction in SMM behaviour and magnetic refrigeration of carbonato bridged CuII2LnIII2 (Ln = Dy, Tb and Gd) complexes of an unsymmetrical N2O4 donor ligand. Dalton Trans 2019; 48:15170-15183. [DOI: 10.1039/c9dt02627d] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The role of exchange interaction between Cu(ii) and Ln(iii) ions in SMM behaviour and magnetocaloric effects has been extensively investigated by both experimental and theoretical CASSCF/RASSI-SO/SINGLE_ANISO methods.
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Affiliation(s)
- Souvik Maity
- Department of Chemistry
- University College of Science
- University of Calcutta
- Kolkata 700009
- India
| | - Arpan Mondal
- Department of Chemistry
- Indian Institute of Science Education and Research Bhopal
- Bhopal 462066
- India
| | - Sanjit Konar
- Department of Chemistry
- Indian Institute of Science Education and Research Bhopal
- Bhopal 462066
- India
| | - Ashutosh Ghosh
- Department of Chemistry
- University College of Science
- University of Calcutta
- Kolkata 700009
- India
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20
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Zhang L, Ma H, Wang ZQ, Tian YM, Zhang YQ, Sun WB. Double and triple pyridine-N-oxide bridged dinuclear Dysprosium(III) dimers and single-molecule magnetic properties. J Mol Struct 2019. [DOI: 10.1016/j.molstruc.2018.08.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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21
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Mandal S, Majumder S, Mondal S, Mohanta S. Synthesis, Crystal Structures and Magnetic Properties of Two Heterobridged µ‐Phenoxo‐µ
1,1
‐Azide/Isocyanate Dinickel(II) Compounds: Experimental and Theoretical Exploration. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800742] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Shuvankar Mandal
- Department of Chemistry Inorganic Chemistry Section University of Calcutta 92 A. P. C Road 700009 Kolkata India
| | - Samit Majumder
- Department of Chemistry Bhairab Ganguly College 2, Feeder Road 700056 Belghoria, Kolkata West Bengal India
| | - Suraj Mondal
- Department of Chemistry Inorganic Chemistry Section University of Calcutta 92 A. P. C Road 700009 Kolkata India
| | - Sasankasekhar Mohanta
- Department of Chemistry Inorganic Chemistry Section University of Calcutta 92 A. P. C Road 700009 Kolkata India
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22
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Zhang L, Chen P, Li H, Tian Y, Yan P, Sun W. Structure and Single‐Molecule Magnetic Property of a Dinuclear Dy
2
Complex Bridged by the 4‐Methylpyridine
N
‐Oxide Ligand. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800596] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Ling Zhang
- Key Laboratory of Functional Inorganic Materials Chemistry of Ministry of Education School of Chemistry and Materials Science Heilongjiang University 74 Xuefu Road 150080 Harbin P. R. China
| | - Peng Chen
- Key Laboratory of Functional Inorganic Materials Chemistry of Ministry of Education School of Chemistry and Materials Science Heilongjiang University 74 Xuefu Road 150080 Harbin P. R. China
| | - Hong‐Feng Li
- Key Laboratory of Functional Inorganic Materials Chemistry of Ministry of Education School of Chemistry and Materials Science Heilongjiang University 74 Xuefu Road 150080 Harbin P. R. China
| | - Yong‐Mei Tian
- Key Laboratory of Functional Inorganic Materials Chemistry of Ministry of Education School of Chemistry and Materials Science Heilongjiang University 74 Xuefu Road 150080 Harbin P. R. China
| | - Peng‐Fei Yan
- Key Laboratory of Functional Inorganic Materials Chemistry of Ministry of Education School of Chemistry and Materials Science Heilongjiang University 74 Xuefu Road 150080 Harbin P. R. China
| | - Wen‐Bin Sun
- Key Laboratory of Functional Inorganic Materials Chemistry of Ministry of Education School of Chemistry and Materials Science Heilongjiang University 74 Xuefu Road 150080 Harbin P. R. China
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23
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Yang JW, Tian YM, Tao J, Chen P, Li HF, Zhang YQ, Yan PF, Sun WB. Modulation of the Coordination Environment around the Magnetic Easy Axis Leads to Significant Magnetic Relaxations in a Series of 3d-4f Schiff Complexes. Inorg Chem 2018; 57:8065-8077. [PMID: 29965732 DOI: 10.1021/acs.inorgchem.8b00056] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A series of Salen-type Zn(II)-Dy(III) complexes [L1Zn(II)ClDy(III)(acac)2]·H2O (1), [L1Zn(II)BrDy(III)(acac)2]·H2O (2), [L1Zn(II)(H2O)Dy(III)(acac)2]·CH2Cl2·PF6 (3), [L2Zn(II)(H2O)Dy(III)(acac)2]·PF6 (4), and Co(III)-Dy(III) complexes [L1Co(III)Br2Dy(III)(acac)2]·CH2Cl2 (5), [L2Co(III)Cl2Dy(III)(acac)Cl(MeO)] (6), [L2Co(III)Cl2Dy(III)(acac)Cl(H2O)] (7), and [L2Co(III)Cl2Dy(III)(NO3)2(MeO)] (8) heterobinuclear single-molecule magnets (SMMs) were synthesized and magnetically characterized. These complexes were constructed by incorporating diamagnetic Zn(II) and Co(III) ions with acetylacetone (acac) and compartmental Schiff-base ligands (H2L1 = N, N'-bis(2-oxy-3-methoxybenzylidene)-1,2-phenylenediamine; H2L2 = N, N'-bis(2-oxy-3-methoxybenzylidene)-1,2-diaminocyclohexane). In the Zn(II)-Dy(III) (1-4) system, the coordination environments of the Dy(III) ions are nearly identical, but the apical coordination atom to the Zn(II) ion is different. Complexes 1, 2, and 4 displayed no magnetic relaxation in the absence of external magnetic field, but complex 3 displayed more pronounced SMM behavior with a relaxation energy barrier Ueff/ kB 38 K and magnetic hysteresis at 1.8 K. The SMM performances of 5, 6, and 7 were enhanced significantly by incorporating an octahedral Co(III) instead of square-pyramidal Zn(II) and replacing one of acac- group around Dy(III) ion by a neutral O atom, displaying Ueff of 167, 118, and 75 K as well as magnetic hysteresis up to 3.5 K. These studies indicated that the remote diamagnetic Zn(II) and Co(III) ions played a key role, and the SMM properties were very strongly related to the special coordination atoms configuration around Dy(III) ion. When this coordination configuration around was broken as 8 exhibited, however, it resulted in a dramatically decreased SMM performance. From this work, the key factors that significantly affect the SMM performance of these heteronuclear Zn(II)/Co(III)-Dy(III) SMMs are unambiguously presented.
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Affiliation(s)
- Jing-Wei Yang
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education, School of Chemistry and Material Science , Heilongjiang University , 74 Xuefu Road , Harbin 150080 , P. R. China
| | - Yong-Mei Tian
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education, School of Chemistry and Material Science , Heilongjiang University , 74 Xuefu Road , Harbin 150080 , P. R. China
| | - Jin Tao
- Jiangsu Key Laboratory for NSLSCS, School of Physical Science and Technology , Nanjing Normal University , Nanjing 210023 , China
| | - Peng Chen
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education, School of Chemistry and Material Science , Heilongjiang University , 74 Xuefu Road , Harbin 150080 , P. R. China
| | - Hong-Feng Li
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education, School of Chemistry and Material Science , Heilongjiang University , 74 Xuefu Road , Harbin 150080 , P. R. China
| | - Yi-Quan Zhang
- Jiangsu Key Laboratory for NSLSCS, School of Physical Science and Technology , Nanjing Normal University , Nanjing 210023 , China
| | - Peng-Fei Yan
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education, School of Chemistry and Material Science , Heilongjiang University , 74 Xuefu Road , Harbin 150080 , P. R. China
| | - Wen-Bin Sun
- Key Laboratory of Functional Inorganic Material Chemistry Ministry of Education, School of Chemistry and Material Science , Heilongjiang University , 74 Xuefu Road , Harbin 150080 , P. R. China.,Key Laboratory of Chemical Engineering Process & Technology for High-Efficiency Conversion , 74 Xuefu Road , Harbin 150080 , P. R. China
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24
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Ghosh S, Mandal S, Singh MK, Liu CM, Rajaraman G, Mohanta S. Experimental and theoretical exploration of magnetic exchange interactions and single-molecule magnetic behaviour of bis(η1:η2:μ2-carboxylate)GdIII2/DyIII2 systems. Dalton Trans 2018; 47:11455-11469. [DOI: 10.1039/c8dt02008f] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
This investigation demonstrates differences in SMM properties and nature of magnetic exchange in closely related DyIII2/GdIII2 compounds.
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Affiliation(s)
- Sagar Ghosh
- Department of Chemistry
- University of Calcutta
- Kolkata 700009
- India
| | - Shuvankar Mandal
- Department of Chemistry
- University of Calcutta
- Kolkata 700009
- India
| | - Mukesh Kumar Singh
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai 400076
- India
| | - Cai-Ming Liu
- Beijing National Laboratory for Molecular Sciences
- Centre for Molecular Science
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
| | - Gopalan Rajaraman
- Department of Chemistry
- Indian Institute of Technology Bombay
- Mumbai 400076
- India
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25
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Ke H, Wei W, Zhang YQ, Zhang J, Xie G, Chen S. Influence of alcoholic solvent and acetate anion coordination mode variations on structures and magnetic properties of heterometallic Zn2Dy2 tetranuclear clusters. Dalton Trans 2018; 47:16616-16626. [DOI: 10.1039/c8dt03983f] [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
We clarify that slight modifications of the synthetic conditions generate two Zn2Dy2 clusters with acetate anion coordination mode variation and different magnetic behaviors.
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Affiliation(s)
- Hongshan Ke
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education
- College of Chemistry and Materials Science
- Northwest University
- Xi'an 710069
- P. R. China
| | - Wen Wei
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education
- College of Chemistry and Materials Science
- Northwest University
- Xi'an 710069
- P. R. China
| | - Yi-Quan Zhang
- Jiangsu Key Laboratory for NSLSCS
- School of Physical Science and Technology
- Nanjing Normal University
- Nanjing 210023
- P. R. China
| | - Jun Zhang
- School of Materials and Chemical Engineering
- Anhui Jianzhu University
- Hefei
- P. R. China
| | - Gang Xie
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education
- College of Chemistry and Materials Science
- Northwest University
- Xi'an 710069
- P. R. China
| | - Sanping Chen
- Key Laboratory of Synthetic and Natural Functional Molecule Chemistry of Ministry of Education
- College of Chemistry and Materials Science
- Northwest University
- Xi'an 710069
- P. R. China
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26
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Ghosh S, Hari N, Pinkowicz D, Fitta M, Mohanta S. Syntheses, crystal structures and magnetic properties of a series of ZnII2LnIII2 compounds (Ln = Gd, Tb, Dy, Ho and Er): contrasting structural and magnetic features. NEW J CHEM 2018. [DOI: 10.1039/c8nj02532k] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the five ZnII2LnIII2 compounds – (i) the TbIII and ErIII analogues show slow relaxation of the magnetization, while the HoIII system and, surprisingly, the DyIII analogue don’t; (ii) the GdIII system shows the MCE; and (iii) interestingly, the Ln–O bond length increases with the increase of atomic number.
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Affiliation(s)
- Sagar Ghosh
- Department of Chemistry
- University of Calcutta
- Kolkata 700 009
- India
| | - Nairita Hari
- Department of Chemistry
- University of Calcutta
- Kolkata 700 009
- India
| | - Dawid Pinkowicz
- Faculty of Chemistry
- Jagiellonian University
- 30-387 Kraków
- Poland
| | - Magdalena Fitta
- Institute of Nuclear Physics
- Polish Academy of Sciences
- 31-342 Krakow
- Poland
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27
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Ghosh K, Harms K, Bauzá A, Frontera A, Chattopadhyay S. Heteronuclear cobalt(iii)/sodium complexes with salen type compartmental Schiff base ligands: methylene spacer regulated variation in nuclearity. Dalton Trans 2018; 47:331-347. [DOI: 10.1039/c7dt03929h] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Three unique heteronuclear cobalt(iii)/sodium Schiff base complexes have been synthesized and characterized. Nuclearity of these complexes changes as a result of alteration of the steric hindrance in the ligand moiety.
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Affiliation(s)
- Kousik Ghosh
- Department of Chemistry
- Inorganic Section
- Jadavpur University
- Kolkata 700032
- India
| | - Klaus Harms
- Fachbereich Chemie
- Philipps-Universität Marburg
- Hans-Meerwein-Strasse
- D-35032 Marburg
- Germany
| | - Antonio Bauzá
- Departament de Química
- Universitat de les Illes Balears
- 07122 Palma
- Spain
| | - Antonio Frontera
- Departament de Química
- Universitat de les Illes Balears
- 07122 Palma
- Spain
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28
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Ghosh S, Roy S, Liu CM, Mohanta S. A nickel(ii)–manganese(ii)-azido layered coordination polymer showing a three-dimensional ferrimagnetic order at 35 K. Dalton Trans 2018; 47:836-844. [DOI: 10.1039/c7dt04032f] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis, crystal structure and magnetic properties of a two-dimensional nickel(ii)–manganese(ii)–azido system are described. It is an interesting molecular magnet because it exhibits long-range ferrimagnetic ordering at a Tc of 35 K and a hysteresis loop up to 20 K.
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Affiliation(s)
- Sagar Ghosh
- Department of Chemistry
- University of Calcutta
- Kolkata 700 009
- India
| | - Shuvayan Roy
- Department of Chemistry
- University of Calcutta
- Kolkata 700 009
- India
| | - Cai-Ming Liu
- Beijing National Laboratory for Molecular Sciences
- Center for Molecular Science
- Institute of Chemistry
- Chinese Academy of Sciences
- Beijing 100190
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29
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Cobalt(II)/(III)–Lanthanide(III) Complexes as Molecular Magnets. TOP ORGANOMETAL CHEM 2018. [DOI: 10.1007/3418_2018_9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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30
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Hari N, Jana A, Mohanta S. Syntheses, crystal structures and ESI-MS of mononuclear–dinuclear, trinuclear and dinuclear based one-dimensional copper(II)–s block metal ion complexes derived from a 3-ethoxysalicylaldehyde–diamine ligand. Inorganica Chim Acta 2017. [DOI: 10.1016/j.ica.2017.07.033] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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31
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Al Hareri M, Ras Ali Z, Regier J, Gavey EL, Carlos LD, Ferreira RAS, Pilkington M. Dual-Property Supramolecular H-Bonded 15-Crown-5 Ln(III) Chains: Joint Magneto-Luminescence and ab Initio Studies. Inorg Chem 2017. [DOI: 10.1021/acs.inorgchem.7b00089] [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)
- Majeda Al Hareri
- Department
of Chemistry, Brock University, 1812 Sir Isaac Brock Way, St Catharines, Ontario L2S 3A1, Canada
| | - Zineb Ras Ali
- Department
of Chemistry, Brock University, 1812 Sir Isaac Brock Way, St Catharines, Ontario L2S 3A1, Canada
| | - Jeffery Regier
- Department
of Chemistry, Brock University, 1812 Sir Isaac Brock Way, St Catharines, Ontario L2S 3A1, Canada
| | - Emma L. Gavey
- Department
of Chemistry, Brock University, 1812 Sir Isaac Brock Way, St Catharines, Ontario L2S 3A1, Canada
| | - Luis D. Carlos
- Physics
Department and CICECO—Aveiro Institute of Materials, University of Aveiro, Aveiro 3810-193, Portugal
| | - Rute A. S. Ferreira
- Physics
Department and CICECO—Aveiro Institute of Materials, University of Aveiro, Aveiro 3810-193, Portugal
| | - Melanie Pilkington
- Department
of Chemistry, Brock University, 1812 Sir Isaac Brock Way, St Catharines, Ontario L2S 3A1, Canada
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32
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Paul A, Hazra S, Sharma G, Guedes da Silva MFC, Koch B, Pombeiro AJL. Unfolding biological properties of a versatile dicopper(II) precursor and its two mononuclear copper(II) derivatives. J Inorg Biochem 2017; 174:25-36. [PMID: 28599129 DOI: 10.1016/j.jinorgbio.2017.05.013] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Revised: 05/26/2017] [Accepted: 05/30/2017] [Indexed: 11/30/2022]
Abstract
Synthesis, inter-conversions and biological study of the dichloro bridged dicopper(II) compound [CuLCl]2 (1) and its two mononuclear derivatives [CuLCl(H2O)]·H2O (2) and [CuLCl(py)] (3) (HL=2-(2-pyridylmethyleneamino)benzenesulfonic acid) are described. The dimeric compound 1 collapses into monomers 2 and 3 in the presence of coordinating solvents, water and pyridine, respectively, and 1 is regenerated upon simple stirring of 2 or 3 in methanol. The reactions of 1 with neutral (present study) and charged (earlier studies) ligands result in monomeric and multimeric compounds, respectively, attesting that it is a versatile dicopper(II) precursor. The anticancer activity of these copper complexes (1-3) was screened against lung (A-549) and breast (MDA-MB-231) human cancer cell lines. The IC50 (half maximal inhibitory concentration) value for one (3) of the compounds suggests preferential cytotoxicity against breast cancer MDA-MB-231 cell line. Furthermore, the IC50 value obtained for complex 3 is found to be almost two-fold times cytotoxic than the standard drug cisplatin. In addition, the underlying possible mechanism of its apoptosis-inducing efficacy in MDA-MB-231 cells has been rationalized by using flow cytometry (FACS) and Hoechst 33342/propidium iodide (PI) fluorescence staining. The stimulation of apoptotic induction for complex 3 has further been affirmed by reactive oxygen species (ROS) generation and mitochondrial aggregations studies.
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Affiliation(s)
- Anup Paul
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001, Lisbon, Portugal
| | - Susanta Hazra
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001, Lisbon, Portugal.
| | - Gunjan Sharma
- Department of Zoology, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - M Fátima C Guedes da Silva
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001, Lisbon, Portugal.
| | - Biplob Koch
- Department of Zoology, Institute of Science, Banaras Hindu University, Varanasi 221005, India.
| | - Armando J L Pombeiro
- Centro de Química Estrutural, Complexo I, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001, Lisbon, Portugal
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34
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Boča R, Stolárová M, Falvello LR, Tomás M, Titiš J, Černák J. Slow magnetic relaxations in a ladder-type Dy(iii) complex and its dinuclear analogue. Dalton Trans 2017; 46:5344-5351. [PMID: 28382333 DOI: 10.1039/c7dt00069c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The complex {[Dy2(PDOA)3(H2O)6]·2H2O}n (1) (H2PDOA = 1,2-phenylenedioxydiacetic acid) was prepared from aqueous solution. Its crystal structure, built up of {-Dy-O-C-O-}n chains interlinked by PDOA ligands yielding a ladder-like arrangement, was determined at 173 K. 1 exhibits slow magnetic relaxation under a small magnetic field BDC = 0.2 T with two (LF and HF) relaxation channels. The LF relaxation time at BDC = 0.2 T and T = 1.85 K is as slow as τ(LF) = 46 ms whereas the HF channel is τ(HF) = 1.4 ms. The mole fraction of the LF species is xLF = 0.76 at 1.85 K and it escapes progressively on heating. In the dinuclear analogue [Dy2(PDOA)3(H2O)6]·3.5H2O (2) one PDOA ligand forms a bis(chelate) bridge between the two Dy(iii) atoms yielding a local structure analogous to that in 1; however its AC susceptibility data show slightly different quantitative characteristics of the single-molecule magnetic behaviour.
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Affiliation(s)
- R Boča
- Department of Chemistry, FPV, University of SS Cyril and Methodius, 917 01 Trnava, Slovakia
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35
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Jiang L, Liu Y, Liu X, Tian J, Yan S. Three series of heterometallic NiII–LnIII Schiff base complexes: synthesis, crystal structures and magnetic characterization. Dalton Trans 2017; 46:12558-12573. [DOI: 10.1039/c7dt02351k] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Three series of NiII–LnIII complexes were synthesized using compartmental Schiff base ligands in conjunction with auxiliary ligands. Their magnetic properties have been well studied.
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Affiliation(s)
- Lin Jiang
- College of Chemistry
- Nankai University
- Tianjin 300071
- China
- Key Laboratory of Advanced Energy Materials Chemistry (MOE)
| | - Yue Liu
- College of Chemistry
- Nankai University
- Tianjin 300071
- China
- Key Laboratory of Advanced Energy Materials Chemistry (MOE)
| | - Xin Liu
- College of Chemistry
- Nankai University
- Tianjin 300071
- China
- Key Laboratory of Advanced Energy Materials Chemistry (MOE)
| | - Jinlei Tian
- College of Chemistry
- Nankai University
- Tianjin 300071
- China
- Key Laboratory of Advanced Energy Materials Chemistry (MOE)
| | - Shiping Yan
- College of Chemistry
- Nankai University
- Tianjin 300071
- China
- Key Laboratory of Advanced Energy Materials Chemistry (MOE)
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36
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Syntheses, crystal structures, lone pair functionality and electrospray ionization mass spectral properties of trinuclear, dimer of trinuclear and trinuclear-based one-dimensional systems of copper(II) and lead(II). Inorganica Chim Acta 2017. [DOI: 10.1016/j.ica.2016.10.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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37
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Hazra S, Meyrelles R, Charmier AJ, Rijo P, Guedes da Silva MFC, Pombeiro AJL. N-HO and N-HCl supported 1D chains of heterobimetallic Cu II/Ni II-Sn IV cocrystals. Dalton Trans 2016; 45:17929-17938. [PMID: 27779268 DOI: 10.1039/c6dt03118h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The Schiff base H2L1 [N,N'-ethylenebis(3-methoxysalicylaldimine)] or H2L2 [N,N'-ethylenebis(3-ethoxysalicylaldimine)] was reacted with MCl2·xH2O and SnCl4·5H2O to afford the supramolecular heterobimetallic systems (H2ED)2+·2[ML]·[SnCl6]2- [M = Cu, L = L1 (1), L = L2 (2); M = Ni, L = L1 (3), L = L2 (4); ED = 1,2-ethylenediamine], whose structures were established by single crystal X-ray analyses. Each structure includes different entities, viz. a mononuclear [CuL]/[NiL] neutral complex (coformer), a hexachlorostannate dianion [SnCl6]2-, a 1,2-ethylenediammonium dication (H2ED2+) and, only in 2 and 4, a methanol molecule. Based on the work of Grothe et al. (Cryst. Growth Des., 2016, 16, 3237-3243), compounds 1 and 3 are cocrystal salts, 2 and 4 are cocrystal salt solvates. The ionic pairs (H2ED)2+·[SnCl6]2- in 1-4 are encapsulated by the Cu- or Ni-complexes, and stabilized by N-HO and one N-HCl bond interactions leading to infinite 1D chains. The antimicrobial studies of 1-4 against yeasts (C. albicans and S. cerevisiae) and Gram-positive (S. aureus and E. faecalis) and -negative bacteria (P. aeruginosa and E. coli) indicate that the Ni2Sn systems (3 and 4) are more active than the analogous Cu2Sn ones (1 and 2).
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Affiliation(s)
- Susanta Hazra
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001 Lisbon, Portugal.
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