Bis-phenoxido and bis-acetato bridged heteronuclear {CoIIIDyIII} single molecule magnets with two slow relaxation branches. Issue 17 (5th April 2016)

• Record Type: Journal Article
• Authors: Hazra, Susanta; Titiš, Ján; Valigura, Dušan; Boča, Roman; Mohanta, Sasankasekhar
• Is Part Of: Dalton transactions. Volume 45:Issue 17(2016)
• Page Start: 7510
• Page End: 7520
• Publication Date: 2016-04-05
• Subjects: Chemistry, Inorganic -- Periodicals; Chemistry, Physical and theoretical -- Periodicals; Chemistry, Inorganic -- Periodicals; 546.05
• DOI: 10.1039/c6dt00848h
• Languages: English
• ISSNs: 1477-9226

Abstract

Abstract : Crystal structures and single molecule magnetic behaviour of two bis(μ-phenoxido)–bis(μ-acetato) {Co III Dy III } complexes, derived from the hexadentate Schiff base N, N ′-ethylenebis(3-ethoxy- or 3-methoxysalicylaldimine), are described. Abstract : Two bis-μ-phenoxido–bis-μ-acetato heterobimetallic {Co III Dy III } complexes1 and2, formulated as [Co III Dy III L(μ-OAc)2 (NO3 )2 ] derived from the comparable hexadentate Schiff bases N, N ′-ethylenebis(3-ethoxysalicylaldimine) and N, N ′-ethylenebis(3-methoxysalicylaldimine) were synthesized and X-ray structure analysis confirms their nearly identical structures. These are the first examples of bis(μ-phenoxido)–bis(μ-carboxylato) {Co III Dy III } systems. The AC susceptibility measurements show that both complexes exhibit a field-induced slow magnetic relaxation with two relaxation branches. While the high-frequency process spans the usual range of the relaxation time for analogous single molecule magnets ( τ 0 ∼ 10 −7 s), the low-frequency branch is as slow as τ ∼ 0.1 s at T = 1.9 K and B = 0.2 T.