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DC Field | Value | Language |
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dc.contributor.author | Rasamsetty, Amaleswari | - |
dc.contributor.author | Das, Chinmoy | - |
dc.contributor.author | Sañudo Zotes, Eva Carolina | - |
dc.contributor.author | Shanmugam, Maheswaran | - |
dc.contributor.author | Baskar, Viswanathan | - |
dc.date.accessioned | 2020-03-30T10:04:18Z | - |
dc.date.available | 2020-03-30T10:04:18Z | - |
dc.date.issued | 2017-12-07 | - |
dc.identifier.issn | 1477-9226 | - |
dc.identifier.uri | http://hdl.handle.net/2445/154387 | - |
dc.description.abstract | A series of three isostructural tetranuclear complexes with the general molecular formula [Ln4(µ3-OH)4(L)4(µ2-piv)4(MeOH)4] (Ln = Gd 1, Dy 2 and Ho 3; LH = [1,3-bis(o-methoxyphenyl)-propane-1,3-dione]) were isolated and unambiguously characterized by single crystal XRD. Under similar reaction conditions, simply changing the co-ligand from pivalate to 2,6-bis(hydroxymethyl)-p-cresol (LH'3) led to the isolation of dinuclear Ln(III) complexes with the general molecular formula [Ln2(L)4(µ2-LH'2)2]·4DMF (Ln =Gd 4, Dy 5 and Ho 6). Direct current magnetic susceptibility data studies on the polycrystalline sample of 1-6 and the results reveal the existence of weak antiferromagnetic exchange interactions between the lanthanide ions in 1 which is evident from the spin Hamiltonian (SH) parameters (J1 = −0.055 cm−1 and g = 2.01) extracted by fitting χMT(T). On the other hand, though complex 4 exhibits weak antiferromagnetic coupling ( J1 = −0.048 cm−1 and g = 1.99) between the Gd(III) ions, the χMT (T ) data of complexes 5 and 6 unambiguously disclose the presence of ferromagnetic interactions between Dy(III) and Tb(III) ions at lower temperature. Magnetization relaxation dynamics studies performed on 2 show frequency dependent out-of-phase susceptibility signals in the presence of an optimum external magnetic field of 0.5 kOe. In contrast, complex 5 shows slow magnetization relaxation with an effective energy barrier (Ueff) of 38.17 cm−1 with a pre-exponential factor (τ0) of 1.85 × 10−6 s. The magnetocaloric effect (MCE) of complexes 1 and 4 was extracted from the detailed magnetization measurement and the change in the magnetic entropy (−ΔSm) of 1 and 4 was found to be 25.57 J kg−1 K−1 and 12.93 J kg−1 K−1,respectively, at 3.0 K for ΔH = 70 kOe. | - |
dc.format.extent | 13 p. | - |
dc.format.mimetype | application/pdf | - |
dc.language.iso | eng | - |
dc.publisher | Royal Society of Chemistry | - |
dc.relation.isformatof | Versió postprint del document publicat a: https://doi.org/10.1039/c7dt00172j | - |
dc.relation.ispartof | Dalton Transactions, 2017, vol. 47, num. 5, p. 1726-1738 | - |
dc.relation.uri | https://doi.org/10.1039/c7dt00172j | - |
dc.rights | (c) Rasamsetty, Amaleswari et al., 2017 | - |
dc.source | Articles publicats en revistes (Química Inorgànica i Orgànica) | - |
dc.subject.classification | Terres rares | - |
dc.subject.classification | Imants | - |
dc.subject.classification | Magnetisme | - |
dc.subject.other | Rare earths | - |
dc.subject.other | Magnets | - |
dc.subject.other | Magnetism | - |
dc.title | Effect of coordination geometry on the magnetic properties of a series of Ln2 and Ln4 hydroxo clusters | - |
dc.type | info:eu-repo/semantics/article | - |
dc.type | info:eu-repo/semantics/acceptedVersion | - |
dc.identifier.idgrec | 682849 | - |
dc.date.updated | 2020-03-30T10:04:18Z | - |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | - |
Appears in Collections: | Articles publicats en revistes (Química Inorgànica i Orgànica) |
Files in This Item:
File | Description | Size | Format | |
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682849.pdf | 2.04 MB | Adobe PDF | View/Open |
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