Eight-coordinate mono- and dinuclear Dy(II) complexes containing a rigid equatorial plane and an anisobidentate carboxylate ligand in the axial position: synthesis, structure and magnetism - Université de Strasbourg Accéder directement au contenu
Article Dans Une Revue Dalton Transactions Année : 2024

Eight-coordinate mono- and dinuclear Dy(II) complexes containing a rigid equatorial plane and an anisobidentate carboxylate ligand in the axial position: synthesis, structure and magnetism

Résumé

A rigid pentadentate chelating ligand (H2L) has been utilized to synthesize a series of octacoordinate mononuclear complexes, [Dy(L)(Ph3PO)(OOCR)] (where R = C6H5 (1), C(CH3)3 (2), CF3 (3)) and a dinuclear complex, [Dy2(L)2(Ph3PO)2{(OOC)2C6H4}] (4) based on the highly anisotropic Dy(III) ion. All the complexes were structurally characterized by single-crystal X-ray diffraction studies. The complexes were formed by the coordination action of the dianionic pentadentate ligand [L]2−, one phosphine oxide, and carboxylate ligands. DC and AC magnetic measurements were performed on 1–4. Complexes 1–4 show SMM behaviour, under zero DC field for 1 and 4, and under 500 Oe and 1000 Oe DC fields for 2 and 3 respectively, with thermally activated, Raman, and Raman and quantum tunnelling dominant relaxation mechanisms for 1 and 2, 3 and 4, respectively.
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hal-04624977 , version 1 (25-06-2024)

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Pankaj Kalita, Kusum Kumari, Pawan Kumar, Vierandra Kumar, Saurabh Kumar Singh, et al.. Eight-coordinate mono- and dinuclear Dy(II) complexes containing a rigid equatorial plane and an anisobidentate carboxylate ligand in the axial position: synthesis, structure and magnetism. Dalton Transactions, 2024, 53 (25), pp.10521-10535. ⟨10.1039/D4DT00803K⟩. ⟨hal-04624977⟩
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