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Issue 3, 2017
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Slow relaxation dynamics of a mononuclear Er(III) complex surrounded by a ligand environment with anisotropic charge density

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Abstract

Two sets of isostructural mononuclear compounds, [Ln(LOMe)2(H2O)2](PF6) [1, Ln = Er; 3, Ln = Gd; LOMe = CpCo{P(O)(O(CH3))2}3] and Ln(LOMe)2(NO3) (2, Ln = Er and 4, Ln = Gd), are synthesized by self-assembly of the respective lanthanide ions and tripodal chelate ligands. The Ln ions are encircled by two LOMe ligands, and two water molecules or one nitrate anion. Each octacoordinated Ln center adopts a distorted square antiprism geometry. The Er complex (2) chelated by a nitrate anion shows slow dynamics in magnetic relaxation, diagnostic of a single-ion magnet. Quantum tunneling in 2 is effectively blocked by application of an external field. Weak intermolecular magnetic interactions occur in 2, and are supported by the magnetic behavior of 4. Chemical dilution of Er with the diamagnetic Y ion can nullify magnetic interactions and suppress quantum tunneling. Generation of slow relaxation dynamics in the Er system is related to the anisotropic charge distribution supplied by the coordination of ligands with different charge densities, as observed in the Dy analogue. This suggests that magnetic anisotropy arises in a coordination system when an anisotropic lanthanide ion (Dy and Er) is surrounded by a ligand environment with anisotropic charge density, resulting in slow magnetic relaxation.

Graphical abstract: Slow relaxation dynamics of a mononuclear Er(iii) complex surrounded by a ligand environment with anisotropic charge density

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Publication details

The article was received on 14 Nov 2016, accepted on 13 Dec 2016 and first published on 13 Dec 2016


Article type: Paper
DOI: 10.1039/C6DT04326G
Citation: Dalton Trans., 2017,46, 739-744
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    Slow relaxation dynamics of a mononuclear Er(III) complex surrounded by a ligand environment with anisotropic charge density

    K. S. Lim, D. W. Kang, J. H. Song, H. G. Lee, M. Yang and C. S. Hong, Dalton Trans., 2017, 46, 739
    DOI: 10.1039/C6DT04326G

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