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

Boca R.; Stolarova M.; Falvello L. R.Tomas M.Titis J.Cernak J.

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

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The complex {Dy-2(PDOA)(3)(H2O)(6)center dot 2H(2)O}(n) (1) (H(2)PDOA = 1,2-phenylenedioxydiacetic acid) was prepared from aqueous solution. Its crystal structure, built up of {-Dy-O-C-O-}(n) 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-DC = 0.2 T with two (LF and HF) relaxation channels. The LF relaxation time at B-DC = 0.2 T and T = 1.85 K is as slow as tau(LF) = 46 ms whereas the HF channel is tau(HF) = 1.4 ms. The mole fraction of the LF species is x(LF) = 0.76 at 1.85 K and it escapes progressively on heating. In the dinuclear analogue Dy-2(PDOA)(3)(H2O)(6)center dot 3.5H(2)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.

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《Dalton transactions: An international journal of inorganic chemistry》 |2017年第16期|5344-5351|共8页
作者
Boca R.; Stolarova M.; Falvello L. R.Tomas M.Titis J.Cernak J.;
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作者单位

Univ SS Cyril & Methodius, FPV, Dept Chem, Trnava 91701, Slovakia;

PJ Safarik Univ Kosice, Inst Chem, Dept Inorgan Chem, Kosice 04154, Slovakia;

Univ Zaragoza, CSIC, Inst Ciencia Mat Aragon, Dept Quim Inorgan, E-50009 Zaragoza, SpainUniv Zaragoza, CSIC, Dept Quim Inorgan, ISQCH, Pedro Cerbuna 12, E-50009 Zaragoza, Spain;

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正文语种英语
中图分类化学;无机化学;
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Slow magnetic relaxations in a ladder-type Dy(III) complex and its dinuclear analogue

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