Exploring the Slow Relaxation of the Magnetization in CoIII‐Decorated {DyIII2} Units. Issue 40 (16th August 2016)

• Record Type: Journal Article
• Authors: Funes, Alejandro V.; Carrella, Luca; Rentschler, Eva; Alborés, Pablo
• Is Part Of: Chemistry. Volume 22:Issue 40(2016)
• Page Start: 14308
• Page End: 14318
• Publication Date: 2016-08-16
• Subjects: dysprosium -- coordination complex -- lanthanides -- magnetic properties -- single-molecule magnets; Chemistry -- Periodicals; 540
• DOI: 10.1002/chem.201602681
• Languages: English
• ISSNs: 0947-6539

Abstract

Abstract: 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 ] (teaH3 =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. Abstract : Singular magnetic : The single‐molecule magnet behavior in [Dy III 2 Co III 2 ] and related [Dy III 2 Co III 4 ] complexes has been explored through experimental direct current (DC) and alternating current (AC) magnetometer techniques (see figure) and is discussed in terms of a simple electrostatic picture.