2
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Wang HS, Zhang K, Wang J, Hu Z, Song Y, Zhang Z, Pan ZQ. Regulating the distortion degree of the square antiprism coordination geometry in Dy–Na single ion magnets. CrystEngComm 2021. [DOI: 10.1039/d1ce00146a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A DyNa complex (1) and a DyNa2 1D chain (2) have been obtained; their square antiprism coordination geometries were changed from the bicapped triangular prism of the reported DyNa2 complex. Compounds 1 and 2 exhibit single ion magnet behavior.
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Affiliation(s)
- Hui-Sheng Wang
- School of Chemistry and Environmental Engineering
- Key Laboratory of Green Chemical Process of Ministry of Education
- Key Laboratory of Novel Reactor and Green Chemical Technology of Hubei Province
- Wuhan Institute of Technology
- Wuhan 430205
| | - Ke Zhang
- School of Chemistry and Environmental Engineering
- Key Laboratory of Green Chemical Process of Ministry of Education
- Key Laboratory of Novel Reactor and Green Chemical Technology of Hubei Province
- Wuhan Institute of Technology
- Wuhan 430205
| | - Jia Wang
- State Key Laboratory of Coordinate Chemistry
- Nanjing National Laboratory of Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
| | - Zhaobo Hu
- State Key Laboratory of Coordinate Chemistry
- Nanjing National Laboratory of Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
| | - You Song
- State Key Laboratory of Coordinate Chemistry
- Nanjing National Laboratory of Microstructures
- School of Chemistry and Chemical Engineering
- Nanjing University
- Nanjing 210023
| | - Zaichao Zhang
- Jiangsu Key Laboratory for the Chemistry of Low-dimensional Materials
- School of Chemistry and Chemical Engineering
- Huaiyin Normal University
- P. R. China
| | - Zhi-Quan Pan
- School of Chemistry and Environmental Engineering
- Key Laboratory of Green Chemical Process of Ministry of Education
- Key Laboratory of Novel Reactor and Green Chemical Technology of Hubei Province
- Wuhan Institute of Technology
- Wuhan 430205
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3
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Kalita P, Nayak P, Ahmed N, Herrera JM, Venkatasubbaiah K, Colacio E, Chandrasekhar V. Seven-coordinate Ln III complexes assembled from a bulky MesacacH ligand: their synthesis, structure, photoluminescence and SMM behaviour. Dalton Trans 2020; 49:15404-15416. [PMID: 33140796 DOI: 10.1039/d0dt03054f] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction of a bulky acetyl acetone ligand 1,3-dimesitylpropane-1,3-dione (MesacacH) with hydrated lanthanide chlorides in the presence of tetramethylammonium hydroxide afforded a new family of neutral mononuclear LnIII complexes [Ln(Mesacac)3(DMF)] (Ln = Dy (1); Tb (2); Y0.91Dy0.09 (3); and Er (4)). The molecular structures of these complexes were confirmed by single crystal X-ray diffraction studies. The coordination geometries of the LnIII centre were analysed by SHAPE analysis which revealed a capped octahedral geometry in 1-4. Photoluminescence studies showed ligand-sensitized green emissions for 2 with an appreciable quantum yield of 0.83%. Static (dc) and dynamic (ac) magnetic studies of complexes 1 and 3 were performed. The dynamic magnetic study revealed that complex 1 exhibits zero-field slow relaxation of the magnetization without showing a clear maximum in the out-of-phase ac susceptibility plots. However, magnetic dilution of 1 with the YIII metal ion (complex 3) and/or the application of a dc magnetic field induces a strong frequency dependence of the ac susceptibility signals with χ''M peaks in the 3-10 K temperature range, thus supporting field-induced SMM behaviour of 1. The relaxation process takes place through a combination of the Orbach and Raman mechanisms. The fitting of the temperature dependence of the relaxation time to the equation τ-1 = τ0-1 exp(-Ueff/kBT) + BTn, allows the extraction of the effective energy barrier Ueff/kB = 70 K (48.7 cm-1) and pre-exponential parameter of τ0 = 2.7 × 10-7 s for the Orbach mechanism (first term) and the parameters B = 0.04 s-1 K-n and n = 6.11, for the Raman mechanism (second term).
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Affiliation(s)
- Pankaj Kalita
- School of Chemical Sciences, National Institute of Science Education and Research Bhubaneswar, HBNI, Jatni, Khurda - 752050, Odisha, India. and Tata Institute of Fundamental Research Hyderabad, Gopanpally, Hyderabad-500 046, India.
| | - Prakash Nayak
- School of Chemical Sciences, National Institute of Science Education and Research Bhubaneswar, HBNI, Jatni, Khurda - 752050, Odisha, India.
| | - Naushad Ahmed
- Tata Institute of Fundamental Research Hyderabad, Gopanpally, Hyderabad-500 046, India.
| | - Juan Manuel Herrera
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, Avenida de Fuentenueva s/n, 18071 Granada, Spain.
| | - Krishnan Venkatasubbaiah
- School of Chemical Sciences, National Institute of Science Education and Research Bhubaneswar, HBNI, Jatni, Khurda - 752050, Odisha, India.
| | - Enrique Colacio
- Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, Avenida de Fuentenueva s/n, 18071 Granada, Spain.
| | - Vadapalli Chandrasekhar
- Tata Institute of Fundamental Research Hyderabad, Gopanpally, Hyderabad-500 046, India. and Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur-208016, India
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4
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Wang JM, Wen LM, Liu FF, Wang SP, Zhang JJ, Liu ZY. Magnetic slow relaxation of pseudo-binuclear Ln(III)-nitronyl nitroxide radical complexes involving non-covalent O⋯O interactions. J Mol Struct 2020. [DOI: 10.1016/j.molstruc.2020.127735] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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6
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Yang M, Liang X, Zhang Y, Ouyang Z, Dong W. A nitronyl nitroxide and its two 1D chain Cu–Tb complexes: synthesis, structures, and magnetic properties. RSC Adv 2020; 10:8490-8496. [PMID: 35497860 PMCID: PMC9050009 DOI: 10.1039/d0ra00018c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2020] [Accepted: 02/06/2020] [Indexed: 11/24/2022] Open
Abstract
A new nitronyl nitroxide, namely NIT-Ph-p-OCH2trz (1), and two types of one-chain Cu–Tb complexes, namely [TbCu(hfac)5NIT-Ph-p-OCH2trz·0.5C6H14]n (2a) and [LnCu(hfac)5NIT-Ph-p-OCH2trz]n (2b) (NIT-Ph-p-OCH2trz = 2-(4-((1H-1,2,4-triazol-1-yl)methoxy)phenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide; hfac = hexafluoroacetylacetonate), have been successfully synthesized simultaneously through reacting nitronyl nitroxide radical NIT-Ph-p-OCH2trz with Cu(hfac)2 and Ln(hfac)3, and the molecular structures have been elucidated via single-crystal X-ray structural analysis. 2a features a ‘ladder-like’ chain structure, while 2b displays a linear chain structure built up by Ln(hfac)3 units bridged with the NO groups of radical ligands. The additional Cu(ii) ions are coordinated to the nitrogen atoms of the triazole units. Nonzero out-of-phase signals are observed for the Tb derivatives (2a and 2b) and they exhibit frequency-dependent out-of-phase signals indicating a single-chain magnet behavior. A new nitronyl nitroxide and two types of one-chain Cu–Tb complexes have been successfully synthesized, and the molecular structures have been elucidated via single-crystal X-ray structural analysis.![]()
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Affiliation(s)
- Meng Yang
- Guangzhou Key Laboratory for Environmentally Functional Materials and Technology
- School of Chemistry and Chemical Engineering
- Guangzhou University
- Guangzhou Higher Education Mega Center
- Guangzhou 510006
| | - Xiaohong Liang
- Guangzhou Key Laboratory for Environmentally Functional Materials and Technology
- School of Chemistry and Chemical Engineering
- Guangzhou University
- Guangzhou Higher Education Mega Center
- Guangzhou 510006
| | - Yandie Zhang
- Guangzhou Key Laboratory for Environmentally Functional Materials and Technology
- School of Chemistry and Chemical Engineering
- Guangzhou University
- Guangzhou Higher Education Mega Center
- Guangzhou 510006
| | - Zhijian Ouyang
- Guangzhou Key Laboratory for Environmentally Functional Materials and Technology
- School of Chemistry and Chemical Engineering
- Guangzhou University
- Guangzhou Higher Education Mega Center
- Guangzhou 510006
| | - Wen Dong
- Guangzhou Key Laboratory for Environmentally Functional Materials and Technology
- School of Chemistry and Chemical Engineering
- Guangzhou University
- Guangzhou Higher Education Mega Center
- Guangzhou 510006
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7
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Wang K, Zhang J, Lu J, Jing P, Li L. Slow magnetic relaxation in Cu-Ln heterometallic Schiff base complexes containing Ln(hfac)4− as counterions. Inorganica Chim Acta 2019. [DOI: 10.1016/j.ica.2019.02.030] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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8
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Yang M, Xie S, Liang X, Zhang Y, Dong W. A novel functional nitronyl nitroxide and its manganese and cobalt complexes: Synthesis, structures and magnetic properties. Polyhedron 2019. [DOI: 10.1016/j.poly.2019.01.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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9
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de Souza MS, Briganti M, Reis SG, Stinghen D, Bortolot CS, Cassaro RAA, Guedes GP, da Silva FC, Ferreira VF, Novak MA, Soriano S, Totti F, Vaz MGF. Magnetic Cationic Copper(II) Chains and a Mononuclear Cobalt(II) Complex Containing [Ln(hfac) 4] - Blocks as Counterions. Inorg Chem 2019; 58:1976-1987. [PMID: 30644737 DOI: 10.1021/acs.inorgchem.8b02929] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Four new heterospin compounds with molecular formula {[Cu2(hfac)3(TlTrzNIT)2][Ln(hfac)4]} n·C7H16 (LnIII = Gd (1), Tb (2), or Dy (3)) and [Co(hfac)(TlTrzNIT)2][Dy(hfac)4] (4), where hfac is hexafluoroacetylacetonato and TlTrzNIT is the nitronylnitroxide radical 1-( m-tolyl)-1 H-1,2,3-triazole-4-(4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide), were obtained. All structures were determined by single-crystal X-ray diffraction. In compounds 1-3, the TlTrzNIT radical is bridge-coordinated to copper(II) ions, leading to positively charged copper(II)-radical chains containing [Ln(hfac)4]- as counterions. In compound 4, the cobalt(II) ion is coordinated to two TlTrzNIT radicals and one hfac ligand in bidentate mode leading to a mononuclear cationic complex that contains [Dy(hfac)4]- as counterion. Magnetic measurements of all complexes were performed. Magnetic data were fit considering the contributions of the copper(II)-radical chain and a paramagnetic gadolinium(III) ion for 1. The sign and magnitude of the magnetic coupling constants extracted from the fit were confirmed by density functional theory calculations. The obtained spin topology shows an alternated ferro-antiferromagnetic chain. Field-induced single molecule magnet behavior was observed for the Dy derivatives 3 and 4, in agreement with CASSCF calculations performed for the latter system.
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Affiliation(s)
- Mateus S de Souza
- Instituto de Química , Universidade Federal Fluminense , Niterói , Rio de Janeiro , 24020-150 , Brazil
| | - Matteo Briganti
- Department of Chemistry "Ugo Schiff" and INSTM RU University of Florence , 50019 Sesto Fiorentino , Italy
| | - Samira G Reis
- Instituto de Química , Universidade Federal Fluminense , Niterói , Rio de Janeiro , 24020-150 , Brazil
| | - Danilo Stinghen
- Instituto de Química , Universidade Federal Fluminense , Niterói , Rio de Janeiro , 24020-150 , Brazil
| | - Carolina S Bortolot
- Instituto de Química , Universidade Federal Fluminense , Niterói , Rio de Janeiro , 24020-150 , Brazil
| | - Rafael A A Cassaro
- Instituto de Química , Universidade Federal do Rio de Janeiro , Rio de Janeiro , 21941-909 , Brazil
| | - Guilherme P Guedes
- Instituto de Química , Universidade Federal Fluminense , Niterói , Rio de Janeiro , 24020-150 , Brazil
| | - Fernando C da Silva
- Instituto de Química , Universidade Federal Fluminense , Niterói , Rio de Janeiro , 24020-150 , Brazil
| | - Vitor F Ferreira
- Instituto de Química , Universidade Federal Fluminense , Niterói , Rio de Janeiro , 24020-150 , Brazil
| | - Miguel A Novak
- Instituto de Física , Universidade Federal do Rio de Janeiro , Rio de Janeiro , 21941-972 , Brazil
| | - Stéphane Soriano
- Instituto de Física , Universidade Federal Fluminense , Niterói , Rio de Janeiro , 24020-140 , Brazil
| | - Federico Totti
- Department of Chemistry "Ugo Schiff" and INSTM RU University of Florence , 50019 Sesto Fiorentino , Italy
| | - Maria G F Vaz
- Instituto de Química , Universidade Federal Fluminense , Niterói , Rio de Janeiro , 24020-150 , Brazil
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