Slow magnetic relaxations in a ladder-type Dy(iii) complex and its dinuclear analogue

The complex {[Dy (PDOA) (H O) ]·2H O} (1) (H PDOA = 1,2-phenylenedioxydiacetic acid) was prepared from aqueous solution. Its crystal structure, built up of {-Dy-O-C-O-} chains interlinked by PDOA ligands yielding a ladder-like arrangement, was determined at 173 K. 1 exhibits slow magnetic relaxation...

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2017-04, Vol.46 (16), p.5344-5351
Main Authors: Boča, R, Stolárová, M, Falvello, L R, Tomás, M, Titiš, J, Černák, J
Format: Article
Language:English
Subjects:
Analogue
Channels
Ligands
Magnetic fields
Magnetic permeability
Magnetic properties
Magnetic relaxation
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Summary:The complex {[Dy (PDOA) (H O) ]·2H O} (1) (H PDOA = 1,2-phenylenedioxydiacetic acid) was prepared from aqueous solution. Its crystal structure, built up of {-Dy-O-C-O-} chains interlinked by PDOA ligands yielding a ladder-like arrangement, was determined at 173 K. 1 exhibits slow magnetic relaxation under a small magnetic field B = 0.2 T with two (LF and HF) relaxation channels. The LF relaxation time at B = 0.2 T and T = 1.85 K is as slow as τ(LF) = 46 ms whereas the HF channel is τ(HF) = 1.4 ms. The mole fraction of the LF species is x = 0.76 at 1.85 K and it escapes progressively on heating. In the dinuclear analogue [Dy (PDOA) (H O) ]·3.5H O (2) one PDOA ligand forms a bis(chelate) bridge between the two Dy(iii) atoms yielding a local structure analogous to that in 1; however its AC susceptibility data show slightly different quantitative characteristics of the single-molecule magnetic behaviour.
ISSN:1477-9226
1477-9234
DOI:10.1039/c7dt00069c