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    • Abstract

       

      Two neutral, isostructural, octanuclear, LnIII complexes, [Ln8(HL)6(L)23-OH)42-OH)2(H2-O)4].solv (Ln = Gd(III), (1Gd) and Dy(III), (2Dy) have been synthesized using LnIII nitrate salts and a ovanillin-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 structurallycharacterized by single crystal X-ray diffraction studies. The complexes are held by the cumulativecoordination action of six [HL]2-, two [L]3- chelating ligands, H2O and hydroxide ligands. Magnetostructuralanalysis of complexes 1Gd and 2Dy reveals the presence of intramolecular antiferromagneticinteractions between the LnIII ions. Magneto-caloric effect was analysed for the complex 1Gd which shows amaximum in the change of molar entropy (–ΔSm) of magnitude 25.5 J kg–1 K–1 at T = 3 K and an applied fieldchange ΔB = 5 T.

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    • Author Affiliations

       

      PANKAJ KALITA1 2 JOYDEB GOURA1 3 PRAKASH NAYAK1 ENRIQUE COLACIO4 VADAPALLI CHANDRASEKHAR2 3

      1. School of Chemical Sciences, National Institute of Science Education and Research, HBNI, Bhubaneswar, Jatni, Khurda 752 050, Odisha, India
      2. Centre for Interdisciplinary Sciences, Tata Institute of Fundamental Research, Gopanpally, Hyderabad 500 046, India
      3. Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208 016, India
      4. Departamento de Quı´mica Inorga´nica, Facultad de Ciencias, Universidad de Granada, Avenida de Fuentenueva s/n, 18071 Granada, Spain
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  • Journal of Chemical Sciences | News

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