Correlation between slow magnetic relaxation and the coordination structures of a family of linear trinuclear Zn(ii)-Ln(iii)-Zn(ii) complexes (Ln = Tb, Dy, Ho, Er, Tm and Yb)

Moe Maeda, Shiori Hino, Kei Yamashita, Yumiko Kataoka, Motohiro Nakano, Tomoo Yamamura, Takashi Kajiwara

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43 Citations (Scopus)

Abstract

Six linear trinuclear [Ln{Zn(L)(AcO)}2]BPh4 complexes (H2L denotes the Schiff-base ligand formed by a condensation reaction between ethylenediamine and two equivalents of o-vanillin), including Ln = Tb (1), Dy (2), Ho (3), Er (4), Tm (5) and Yb (6) were synthesized and were confirmed to be isostructural via X-ray crystallographic analyses. The Ln(iii) ion in each complex is deca-coordinated by four equatorial oxygen donors from the methoxo groups of the Schiff-base ligands, two oxygen donors from the acetate anions and four axial oxygen donors from the phenoxo groups of the Schiff-base ligands. AC susceptibility measurements, with an oscillating frequency of 10 to 10000 Hz, revealed that 1, 2, 4 and 6 show slow magnetic relaxation under a 1000 Oe DC bias field, which occurs via a single process, as confirmed by the semi-circular Cole-Cole plots. These complexes are considered to be field-induced single-molecule magnets under these conditions. The presence or absence of the slow magnetic relaxation process is discussed by correlating the characteristic magnetic anisotropy of each Ln(iii) ion with the ligand field anisotropy.

Original languageEnglish
Pages (from-to)13640-13648
Number of pages9
JournalDalton Transactions
Volume41
Issue number44
DOIs
Publication statusPublished - 2012 Nov 28

ASJC Scopus subject areas

  • Inorganic Chemistry

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