Issue 78, 2015

Slow magnetic relaxation of a three-dimensional metal–organic framework featuring a unique dysprosium(iii) oxalate layer

Abstract

A novel lanthanide metal–organic framework was yielded by a hydrothermal reaction of 5-chloro-6-hydroxypyridine-3-carboxylic acid (5-Cl-6-HOPy-3-CO2H) and Dy2O3 in the presence of oxalic acid [H2(OX)], namely, {[Dy2(1H-5-Cl-6-Opy-3-CO2)2(OX)2(H2O)]·2H2O} (1, 1H-5-Cl-6-Opy-3-CO2 = 1-hydro-5-chloro-6-oxopyridine-3-carboxylate, which was formed by the autoisomerization of single deprotonated 1H-5-Cl-6-HOpy-3-CO2 anion). The dysprosium(III) ions are bridged by oxalate anions to construct an interesting 4-connected layer network with a Schälfli topology symbol of (32·52) (3·53), such layers are connected with each other by the 1H-5-Cl-6-HOpy-3-CO2 anions to form a three-dimensional framework. Magnetic investigations indicated that 1 is a field-induced single-molecule magnet, displaying two-step thermal magnetic relaxation, with an effective thermal barrier of 37.6 K. Surprisingly, a zigzag chain-like gadolinium(III) complex, {[Gd(1H-5-Cl-6-Opy-3-CO2)2(OX)0.5(H2O)3]·6H2O} (2), was isolated using Gd2O3 instead of Dy2O3 owing to the lanthanide contraction effect. Notebaly, a unique F-shaped (H2O)6 supramolecular aggregate exists in the crystal structure of 2.

Graphical abstract: Slow magnetic relaxation of a three-dimensional metal–organic framework featuring a unique dysprosium(iii) oxalate layer

Supplementary files

Article information

Article type
Paper
Submitted
17 Jūn. 2015
Accepted
16 Jūl. 2015
First published
16 Jūl. 2015

RSC Adv., 2015,5, 63186-63192

Slow magnetic relaxation of a three-dimensional metal–organic framework featuring a unique dysprosium(III) oxalate layer

C. Liu, D. Zhang and D. Zhu, RSC Adv., 2015, 5, 63186 DOI: 10.1039/C5RA11621J

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