Issue 44, 2014

A family of novel Mn3Ln4 clusters displaying single-molecule magnet behavior

Abstract

Using 3-methyloxysalicylaldoxime (mosaoH2) and N-methyl diethanolamine (N-mdeaH2) as coligands, a family of heptanuclear Mn/Ln heterometallic compounds [MnIIMnIII2LnIII4(mosao)2(mosaoH)4(piv)4(N-mdea)4xMeCN [Ln = Dy(1), Tb(2) and Y(3), pivH = pivalic acid] have been prepared. The crystal structures of 1–3 were obtained, and their core consists of two MnIIILn23-OR)2 (RO2− = N-mdea2−) triangles linked to a central MnII atom. A dc magnetic susceptibility study reveals that single-ion effects of the Ln ions are dominant in compounds 1 and 2. As for compound 3, which contains diamagnetic Y ions, the magnetic interactions between Mn ions via oximate NO bridges are revealed to be ferromagnetic. Fitting of the χmT vs. T data gives g = 1.96 and J = 1.12 cm−1, affording a S = 13/2 ground state. All of the three compounds exhibit frequency-dependent out-of-phase ac susceptibility signals indicative of slow magnetization relaxation and potential SMM behavior. Among them, 1 and 3 display the out-of-phase χ′′m peak maximum above 2.0 K. Fitting of the ac susceptibility data to the Arrhenius law gives an energy barrier Ueff = 9.27/13.83 K for 1 and 3, respectively.

Graphical abstract: A family of novel Mn3Ln4 clusters displaying single-molecule magnet behavior

Supplementary files

Article information

Article type
Paper
Submitted
18 Jun 2014
Accepted
12 Sep 2014
First published
15 Sep 2014

Dalton Trans., 2014,43, 16737-16744

Author version available

A family of novel Mn3Ln4 clusters displaying single-molecule magnet behavior

H. Chen, C. Ma, M. Hu, H. Wen and C. Chen, Dalton Trans., 2014, 43, 16737 DOI: 10.1039/C4DT01816H

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