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Exploring the Slow Relaxation of the Magnetization in Co III ‐Decorated {Dy III 2 } Units
Author(s) -
Funes Alejandro V.,
Carrella Luca,
Rentschler Eva,
Alborés Pablo
Publication year - 2016
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201602681
Subject(s) - magnetization , triethanolamine , relaxation (psychology) , multiplet , field (mathematics) , chemistry , crystal (programming language) , analytical chemistry (journal) , magnetic susceptibility , condensed matter physics , crystallography , magnetic field , nuclear magnetic resonance , physics , spectral line , psychology , social psychology , mathematics , chromatography , quantum mechanics , astronomy , computer science , pure mathematics , programming language
We have prepared and structurally characterized a new member of the butterfly‐like {Co III 2 Dy III 2 } single‐molecule magnets (SMMs) through further Co III decoration, with the formula [Co III 4 Dy III 2 (OH) 2 (teaH) 2 (tea) 2 (Piv) 6 ] (teaH 3 =triethanolamine; Piv=trimethylacetate or pivalate). Direct current (DC) susceptibility and magnetization measurements were performed allowing the extraction of possible crystal‐field parameters. A simple electrostatic modeling shows reasonable agreement with experimental data. Alternating current (AC) susceptibility measurements under a zero DC field and under small applied fields were performed at different frequencies (i.e., 10–1500 Hz) and at low temperatures (i.e., 2–10 K). Multiple magnetization relaxation pathways are observed. Comparison with previously reported {Co III 2 Dy III 2 } complex measurements allows an overall discussion about the origin of the dynamic behavior and its relationship with crystal‐field split ground multiplet sublevels.