Synthesis, structures and magnetic characterizations of isostructural tetranuclear Ln4 clusters (Ln = Dy, Ho, and Eu)

Bong Ho Koo, Kwang Soo Lim, Dae Won Ryu, Woo Ram Lee, Eui Kwan Koh, Chang Seop Hong

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

Isostructural tetranuclear clusters [Ln4(salen) 6]·xH2O [Ln = Dy, 1·5.5H2O; Ho, 2·4.6H2O; Eu, 3·5.2H2O; salen = N,N′-ethylenebis(salicylideneiminato)dianion] were prepared by self-assembling the corresponding lanthanide ions and a quadridentate Schiff base. Interestingly, the Ln ions are surrounded by the N- and O-donors of the Schiff bases, leading to seven- and eight-coordinate environments. The heptacoordinated Ln centers adopt a distorted capped trigonal prism, while the octacoordinated Ln atoms are in a dodecahedral disposition. The Dy complex exhibits slow magnetic relaxation, characteristic of a single-molecule magnet. Two relaxation modes in the Dy system are evident when Hdc = 1.4 kG is applied, which is attributable to the existence of the dissimilar coordination geometries around Dy. In comparison, the Ho and Eu analogues were magnetically inspected, displaying no typical slow magnetic relaxation. These findings elucidate that the metal component in the system plays a central role in the occurrence of the magnetization relaxation process. The pronounced long-range order may contribute to intrachain exchange couplings and through-space dipolar interactions between adjacent chains.

Original languageEnglish
Pages (from-to)7204-7209
Number of pages6
JournalDalton Transactions
Volume42
Issue number19
DOIs
Publication statusPublished - 2013 May 6

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Magnetic relaxation
Schiff Bases
Ions
Lanthanoid Series Elements
Exchange coupling
Magnets
Relaxation processes
Prisms
Magnetization
Metals
Atoms
Molecules
Geometry
disalicylaldehyde ethylenediamine

ASJC Scopus subject areas

  • Inorganic Chemistry

Cite this

Synthesis, structures and magnetic characterizations of isostructural tetranuclear Ln4 clusters (Ln = Dy, Ho, and Eu). / Koo, Bong Ho; Lim, Kwang Soo; Ryu, Dae Won; Lee, Woo Ram; Koh, Eui Kwan; Hong, Chang Seop.

In: Dalton Transactions, Vol. 42, No. 19, 06.05.2013, p. 7204-7209.

Research output: Contribution to journalArticle

Koo, Bong Ho ; Lim, Kwang Soo ; Ryu, Dae Won ; Lee, Woo Ram ; Koh, Eui Kwan ; Hong, Chang Seop. / Synthesis, structures and magnetic characterizations of isostructural tetranuclear Ln4 clusters (Ln = Dy, Ho, and Eu). In: Dalton Transactions. 2013 ; Vol. 42, No. 19. pp. 7204-7209.
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