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Kumar P, Swain A, Acharya J, Li Y, Kumar V, Rajaraman G, Colacio E, Chandrasekhar V. Synthesis, Structure, and Zero-Field SMM Behavior of Homometallic Dy2, Dy4, and Dy6 Complexes. Inorg Chem 2022; 61:11600-11621. [PMID: 35849822 DOI: 10.1021/acs.inorgchem.2c01041] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The synthesis, structure, and magnetic properties of three DyIII complexes of different nuclearity, [Dy2(H2L)2(NO3)] [NO3]·2H2O·CH3OH (1), [Dy4(HL)2(piv)4(OH)2] (2), and [Dy6(H2L)3(μ3-OH)(μ3-CO3)3(CH3OH)4(H2O)8] 5Cl·3H2O (3) [(H4L) = 6-((bis(2-hydroxyethyl)amino)-N'-(2-hydroxybenzylidene)picolinohydrazide)], are described. This variety of complexes with the same ligand could be obtained by playing with the metal-to-ligand molar ratio, the type of DyIII salt, the kind of base, and the presence/absence of coligand. 1 is a dinuclear complex, while 2 is a tetranuclear assembly with a butterfly-shaped topology. 3 is a homometallic hexanuclear complex that exhibits a propeller-shaped topology. Interestingly, in this complex 3, three atmospheric carbon dioxide molecules are trapped in the form of carbonate ions, which assist in holding the hexanuclear complex together. All of the complexes reveal a slow relaxation of magnetization even in zero applied field. Complex 1 is a zero-field SMM with an effective energy barrier (Ueff) of magnetization reversal equal to 87(1) K and a relaxation time of τ0 = 6.4(3) × 10-9 s. Under an applied magnetic field of 0.1 T, these parameters change to Ueff = 101(3) K, τ0 = 2.5(1) × 10-9 s. Complex 2 shows zero-field SMM behavior with Ueff = 31(2) K, τ0 = 4.2(1) × 10-7 s or τ01 = 2(1) × 10-7 s, Ueff1 = 37(8) K, τ02 = 5(6) × 10-5 s, and Ueff2 = 8(4) by considering two Orbach relaxation processes, while 3, also a zero-field SMM, shows a double relaxation of magnetization [Ueff1 = 62.4(3) K, τ01 = 4.6(3) × 10-8 s, and Ueff1 = 2(1) K, τ02 = 4.6(2) × 10-5 s]. The ab initio calculations indicated that in these complexes, the Kramer's ground doublet is characterized by an axial g-tensor with the prevalence of the mJ = ±15/2 component, as well as that due to the weak magnetic coupling between the metal centers, the magnetic relaxation, which is dominated by the single DyIII centers rather than by the exchange-coupled states, takes place via Raman/Orbach or TA-QTM. Moreover, theoretical calculations support a toroidal magnetic state for complex 2.
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Affiliation(s)
- Pawan Kumar
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Abinash Swain
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Joydev Acharya
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Yanling Li
- Sorbonne Universit Institut Parisien de Chimie Molculaire, CNRS UMR 8232, 4 place Jussieu, 75252 Paris cedex 5, France
| | - Vierandra Kumar
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Gopalan Rajaraman
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Enrique Colacio
- Department of Inorganic Chemistry, University of Granada, 18071 Granada, Spain
| | - Vadapalli Chandrasekhar
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India.,Tata Institute of Fundamental Research Hyderabad, Gopanpally, Hyderabad 500 107, India
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2
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Pandit NR, Bej S, Banerjee P, Biswas B. Unveiling Role of Metals in Mononuclear Metal‐Complexes for Chemodosimetric Detection of S
2−
from aqueous medium: Experimental and DFT Corroboration with Real‐Field Application. ChemistrySelect 2022. [DOI: 10.1002/slct.202200307] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Nithun Ranjan Pandit
- Department of Chemistry Presidency University, 86/1 College Street Kolkata 700073 India
| | - Sourav Bej
- Surface Engineering & Tribology Group CSIR-Central Mechanical Engineering Research Institute Mahatma Gandhi Avenue Durgapur 713209 India
- Academy of Scientific & Innovative Research (AcSIR) AcSIR Headquarters CSIR-HRDC Campus Postal Staff College Area, Sector 19, Kamla Nehru Nagar Ghaziabad 201002 Uttar Pradesh India
| | - Priyabrata Banerjee
- Surface Engineering & Tribology Group CSIR-Central Mechanical Engineering Research Institute Mahatma Gandhi Avenue Durgapur 713209 India
- Academy of Scientific & Innovative Research (AcSIR) AcSIR Headquarters CSIR-HRDC Campus Postal Staff College Area, Sector 19, Kamla Nehru Nagar Ghaziabad 201002 Uttar Pradesh India
| | - Biplab Biswas
- Department of Chemistry Presidency University, 86/1 College Street Kolkata 700073 India
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3
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Sushila, Shivam K, Venugopalan P, Rani J, Tian H, Goswami S, Patra R. Design of Dinuclear Lanthanide Complexes from N
2
O
2
Donor Ligand for Single Molecule Magnets: Crystalline Architecture and Slow Magnetic Relaxation Studies. ChemistrySelect 2022. [DOI: 10.1002/slct.202103720] [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)
- Sushila
- Department of Chemistry and Centre for Advance Studies Panjab University Chandigarh India
| | - Kumar Shivam
- Amity Institute of Click Chemistry Research & Studies (AICCRS) Amity University Noida India
| | - Paloth Venugopalan
- Department of Chemistry and Centre for Advance Studies Panjab University Chandigarh India
| | - Jyoti Rani
- School of Advance Chemical Sciences Shoolini University Solan Himachal Pradesh India
| | - Haiquan Tian
- Shandong Provincial Key Laboratory of Chemical Energy Storage and Novel Cell Technology School of Chemistry and Chemical Engineering Liaocheng University Liaocheng 252059 P. R. China
| | - Soumyabrata Goswami
- Department of Chemistry Amity Institute of Applied Sciences Amity University Kolkata India
| | - Ranjan Patra
- Department of Chemistry and Centre for Advance Studies Panjab University Chandigarh India
- Amity Institute of Click Chemistry Research & Studies (AICCRS) Amity University Noida India
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4
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Wang L, Yao X, Zou X, Li J, Sun W, Li G. Salen-type mononuclear dysprosium complex displays significant performance of single-molecule magnet. CrystEngComm 2022. [DOI: 10.1039/d1ce01684a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Three salen-type mononuclear lanthanide complexes with general formula [Ln(5-NO2salcy)(NO3)(CH3OH)2] (Ln = Dy (1), Ho (2) and Er (3)) have been designed and synthesized by reactions of N,N'-bis(5-nitrosalicylaldehyde)ethane-1,2-cyclohexanediamine (5-NO2salcyH2) with various...
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An experimental and theoretical investigation of lanthanide complexes [Ln = Nd, Yb, Eu, Dy and tb] with 4-((2-hydroxy-naphthalen-1-yl)methylene amino)benzenesulfonamide ligand. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119955] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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6
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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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