• JOYDEB GOURA

      Articles written in Journal of Chemical Sciences

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

      PANKAJ KALITA JOYDEB GOURA PRAKASH NAYAK ENRIQUE COLACIO VADAPALLI CHANDRASEKHAR

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      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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