A single-molecule magnet featuring a parallelogram [Dy4(OCH2–)4] core and two magnetic relaxation processes?

Dalton Transactions Pub Date: 2013-08-01 DOI: 10.1039/C3DT51785C

Abstract

An alkoxido-bridged tetranuclear Dy(III) complex, [Dy4(H3L)2(OAc)6]·2EtOH {1, H6L = 1,3-bis[tris(hydroxymethyl)methylamino]propane}, has been solvothermally synthesized and characterized. An X-ray crystallographic study revealed that complex 1 possesses a novel “parallelogram” [Dy4(OCH2–)4] core, and a new binding mode η3:η3:η1:η1:η1:η2:μ4 of the Bis-tris propane ligand was observed. Magnetic investigations indicated that it is a single-molecule magnet (SMM), showing two distinct magnetic relaxation processes with the energy barriers of 44 K and 107 K, respectively. Such a two-step magnetic relaxation process could be well described by the sum of two modified Debye functions.

Graphical abstract: A single-molecule magnet featuring a parallelogram [Dy4(OCH2–)4] core and two magnetic relaxation processes
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