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Synthesis, Magnetic and High-Field EPR Investigation of Two Tetranuclear NiII-Based Complexes
journal contribution
posted on 2019-10-18, 15:34 authored by Lívia
B. L. Escobar, Guilherme P. Guedes, Stéphane Soriano, Jonathan Marbey, Stephen Hill, Miguel A. Novak, Maria G. F. VazTwo tetranuclear
compounds with a cubane-like structure were synthesized
from a one-pot reaction between NiII and 2,2,6,6-tetramethyl-3,5-heptanedione
(Hdpm) for 1 or 4,4,4-trifluoro-1-phenyl-1,3-butanedione
(Hbta) for 2 in the presence of sodium methoxide. The
crystal structures of both compounds have been determined by single-crystal
X-ray diffraction, and their magnetic properties have been studied
by SQUID magnetometry as well as by high-field electron paramagnetic
resonance (HFEPR) spectroscopy. For 1, the temperature
dependence of the magnetic susceptibility can be fitted by taking
into account Ni···Ni ferromagnetic interactions, which
leads to an S = 4 ground-state spin. For 2, both antiferromagnetic and ferromagnetic interactions are present.
However, the latter are dominant, which also leads to an S = 4 ground-state spin, in good agreement with the HFEPR study.