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Octanuclear {Ln8} complexes: magneto-caloric effect in the {Gd8} analogue

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Abstract

Two neutral, isostructural, octanuclear, LnIII complexes, [Ln8(HL)6(L)2(μ3-OH)4(μ2-OH)2(H2O)4].solv (Ln = Gd(III), (1Gd) and Dy(III), (2Dy) have been synthesized using LnIII nitrate salts and a o-vanillin-supported multi-dentate ligand, N'-(2-hydroxy-3-methoxy-5-nitrobenzylidene)-2-(hydroxyamino) propanehydrazide (H3L) in the presence of tetramethyl ammonium hydroxide. The complexes were structurally characterized by single crystal X-ray diffraction studies. The complexes are held by the cumulative coordination action of six [HL]2−, two [L]3− chelating ligands, H2O and hydroxide ligands. Magneto-structural analysis of complexes 1Gd and 2Dy reveals the presence of intramolecular antiferromagnetic interactions between the LnIII ions. Magneto-caloric effect was analysed for the complex 1Gd which shows a maximum in the change of molar entropy (–ΔSm) of magnitude 25.5 J kg–1 K–1 at T = 3 K and an applied field change ΔB = 5 T.

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Authors and Affiliations

  1. School of Chemical Sciences, National Institute of Science Education and Research, HBNI, Bhubaneswar, Jatni, Khurda, 752 050, Odisha, India

    PANKAJ KALITA, JOYDEB GOURA & PRAKASH NAYAK

  2. Centre for Interdisciplinary Sciences, Tata Institute of Fundamental Research, Gopanpally, Hyderabad, 500 046, India

    PANKAJ KALITA & VADAPALLI CHANDRASEKHAR

  3. Departamento de Química Inorgánica, Facultad de Ciencias, Universidad de Granada, Avenida de Fuentenueva s/n, 18071, Granada, Spain

    ENRIQUE COLACIO

  4. Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, 208 016, India

    JOYDEB GOURA & VADAPALLI CHANDRASEKHAR

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KALITA, P., GOURA, J., NAYAK, P. et al. Octanuclear {Ln8} complexes: magneto-caloric effect in the {Gd8} analogue. J Chem Sci 133, 82 (2021). https://doi.org/10.1007/s12039-021-01920-7

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