Magnetic properties of composites based on the intercalation of ZnII and CuII bimetallic macrocyclic complexes in the MnPS3 phase
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2017
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Asymmetric macrocyclic complexes of the type [M2LCl2]$xH2O have been obtained and intercalated using the
potassium precursor phase K0.4Mn0.8PS3$H2O (M: ZnII or CuII; LH2: macrocyclic ligand derived from 2-
hydroxy-5-methyl-1,3-benzenedicarbaldehyde and two different amines, namely, ethylenediamine and o phenylenediamine). The intercalation of the layered phase K0.4Mn0.8PS3$H2O by the macrocyclic species
was carried out by a microwave-assisted reaction and enabled the partial exchange of the hydrated
potassium ions located in the interlayer space to obtain the composites K0.32[Zn2L]0.04Mn0.8PS3 (1) and
K0.24[Cu2L]0.08Mn0.8PS3 (2). These magnetic materials were studied by DC and AC magnetization
measurements and electron paramagnetic resonance (EPR) spectroscopy. In comparison with the
potassium precursor, both composites gave rise to broader and less intense spontaneous magnetization
curves at low temperatures. The composite K0.32[Zn2L]0.04Mn0.8PS3 (1) exhibited spontaneous magnetization
in the form of one broad asymmetric maximum at 27 K. However, K0.24[Cu2L]0.08Mn0.8PS3 (2) had two
defined maxima at 24 and 12 K. The observation of a maximum in the imaginary part of the AC
susceptibility data implies the existence of a spin canting phenomenon that would be responsible for the
spontaneous magnetization. The EPR results are qualitatively consistent with the magnetization data and
reveal that exchange narrowing effects were responsible for the narrowing and broadening of the line shapes.
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FUENTEALBA, P. et al. Magnetic properties of composites based on the intercalation of Zn II and Cu II bimetallic macrocyclic complexes in the MnPS 3 phase. RSC Advances, London, v. 7, n. 53, p. 33305-33313, 2017. DOI: 10.1039/c7ra05089e. Disponível em: https://pubs.rsc.org/en/content/articlepdf/2017/ra/c7ra05089e. Acesso em: 25 maio 2023.