ic5008044_si_003.cif (48.42 kB)
New Families of Hetero-tri-spin 2p−3d−4f Complexes: Synthesis, Crystal Structures, and Magnetic Properties
Version 2 2016-02-25, 18:36
Version 1 2016-02-17, 06:21
dataset
posted on 2016-02-25, 18:36 authored by Lívia
B. L. Escobar, Guilherme P. Guedes, Stéphane Soriano, Nivaldo L. Speziali, Alessandro
K. Jordão, Anna Claudia Cunha, Vitor F. Ferreira, Catalin Maxim, Miguel
A. Novak, Marius Andruh, Maria G. F. VazIn this work we report the synthesis, crystal structures, and magnetic
behavior of 2p–3d–4f heterospin systems containing the
nitroxide radical 4-azido-2,2,6,6-tetramethylpiperidine-1-oxyl radical
(N3tempo). These compounds were synthesized through a one-pot
reaction by using [Cu(hfac)2], [Ln(hfac)3] (hfac
= hexafluoroacetylacetonate, Ln = DyIII, TbIII or GdIII), and the N3tempo radical. Depending
on the stoichiometric ratio used, the synthesis leads to penta- or
trimetallic compounds, with molecular formulas [Cu3Ln2(hfac)8(OH)4(N3tempo)]
(Ln = Gd, Tb, Dy) and [CuLn2(hfac)8(N3tempo)2(H2O)2] (Ln = Gd,
Dy). The magnetic properties of all compounds were investigated by
direct current (dc) and alternating current (ac) measurements. The
ac magnetic susceptibility measurements of TbIII- and DyIII-containing compounds of both families revealed slow relaxation
of the magnetization, with magnetic quantum tunneling in zero field.
