In:
Dalton Transactions, Royal Society of Chemistry (RSC), Vol. 50, No. 35 ( 2021), p. 12275-12286
Abstract:
Two series of heterometallic Ln III –Cu II compounds containing a butterfly-like tetranuclear metal core were synthesized and characterized by X-ray diffraction and magnetometry. The structures of the new compounds were shown to depend on the nature of the hydroxide used for the synthesis. The reactions of copper( ii ) and lanthanide( iii ) salts with Hpiv (Hpiv is trimethylacetic acid) and LiOH in a MeCN–EtOH mixture afford the molecular complexes [Ln 2 Cu 2 (μ 3 -OH) 2 (piv) 8 (H 2 O) 4 ]·4EtOH (1Ln, Ln = Gd, Tb, Dy, Ho, Yb), whereas the similar reactions using NaOH instead of LiOH give the 1D coordination polymers [Na 2 Ln 2 Cu 2 (μ 3 -OH) 2 (piv) 10 (EtOH) 2 ]·EtOH (2Ln, Ln = Gd, Tb, Dy, Ho, Yb). Acc ording to ac susceptibility measurements, the Dy III –Cu II compounds (1Dy and 2Dy) exhibit slow relaxation of magnetization indicative of single-molecule magnet (SMM) behavior. In the series of Yb III –Cu II compounds, only complex 2Yb shows frequency-dependent out-of-phase ac susceptibility signals. This is the first reported example of carboxylate-based Yb III –Cu II compound displaying slow magnetic relaxation.
Type of Medium:
Online Resource
ISSN:
1477-9226
,
1477-9234
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2021
detail.hit.zdb_id:
1472887-4
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