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

Kwang Soo Lim, Dong Won Kang, Jeong Hwa Song, Han Geul Lee, Mino Yang, Chang Seop Hong

Research output: Contribution to journalArticle

3 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)739-744
Number of pages6
JournalDalton Transactions
Volume46
Issue number3
DOIs
Publication statusPublished - 2017

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Charge density
Ions
Ligands
Magnetic relaxation
Lanthanoid Series Elements
Nitrates
Anions
Magnets
Magnetic anisotropy
Charge distribution
Anisotropy
Self assembly
Dilution
Molecules
Geometry
Water

ASJC Scopus subject areas

  • Inorganic Chemistry

Cite this

Slow relaxation dynamics of a mononuclear Er(iii) complex surrounded by a ligand environment with anisotropic charge density. / Lim, Kwang Soo; Kang, Dong Won; Song, Jeong Hwa; Lee, Han Geul; Yang, Mino; Hong, Chang Seop.

In: Dalton Transactions, Vol. 46, No. 3, 2017, p. 739-744.

Research output: Contribution to journalArticle

Lim, Kwang Soo ; Kang, Dong Won ; Song, Jeong Hwa ; Lee, Han Geul ; Yang, Mino ; Hong, Chang Seop. / Slow relaxation dynamics of a mononuclear Er(iii) complex surrounded by a ligand environment with anisotropic charge density. In: Dalton Transactions. 2017 ; Vol. 46, No. 3. pp. 739-744.
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