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Mechanism of magnetisation relaxation in M III 2 Dy III 2 (M = Cr, Mn, Fe, Al) “butterfly” complexes: How important are the transition metal ions here?

Peng, Y.; Singh, M. K.; Mereacre, V.; Anson, C. E.; Rajaraman, G.; Powell, A. K.

Abstract:
We describe the synthesis, characterisation and magnetic studies of four tetranuclear, isostructural “butterfly” heterometallic complexes: [MIII 2 LnIII 2 (m3-OH)2(p-Me-PhCO2)6(L)2] (H2 L ¼ 2,20-((pyridin-2-ylmethyl)azanediyl)bis(ethan-1-ol), M ¼ Cr, Ln ¼ Dy (1), Y (2), M ¼ Mn, Ln ¼ Dy (3), Y (4)), which extend our previous study on the analogous 5 {Fe2Dy2}, 6 {Fe2Y2} and 7 {Al2Dy2} compounds. We also present data on the yttrium diluted 7 {Al2Dy2}: 8 {Al2Dy0.18Y1.82}. Compounds dc and ac magnetic susceptibility data reveal single-molecule magnet (SMM) behaviour for complex 3 {Mn2Dy2}, in the absence of an external magnetic field, with an anisotropy barrier Ueff of 19.2 K, while complex 1 {Cr2Dy2}, shows no ac signals even under applied dc field, indicating absence of SMM behaviour. The diluted sample 8 {Al2Dy0.18Y1.82} shows field induced SMM behaviour with an anisotropy barrier Ueff of 69.3 K. Furthermore, the theoretical magnetic properties of [MIII 2 LnIII 2 (m3-OH)2(p-Me-PhCO2)6(L)2] (M ¼ Cr, 1 or Mn, 3) and their isostructural complexes: [MIII 2 DyIII 2 (m3-OH)2(p-Me-PhCO2)6(L)2] (M ¼ Fe, 5 or Al, 7) are discussed and compared. To understand the experimental observations for this family, DFT and ab initio CASSCF + RASSI-SO calculations were performed. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000095855
Veröffentlicht am 26.06.2019
Coverbild
Zugehörige Institution(en) am KIT Institut für Anorganische Chemie (AOC)
Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 2041-6520, 2041-6539
KITopen-ID: 1000095855
Erschienen in Chemical science
Band 10
Heft 21
Seiten 5528-5538
Vorab online veröffentlicht am 16.04.2019
Nachgewiesen in Scopus
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