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Issue 14, 2017
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Embedding 1D or 2D cobalt–carboxylate substrates in 3D coordination polymers exhibiting slow magnetic relaxation behaviors: crystal structures, high-field EPR, and magnetic studies

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Abstract

By utilizing well-designed bifunctional ligands derived from 1H-imidazole-4,5-dicarboxylic acid, magnetic coordination polymers (CPs) that exhibit slow magnetic relaxation at the low temperature regions were constructed and further structurally characterized. In 1, 1D cobalt–carboxyl chains were stabilized in the final structure. In contrast, by adjusting the length of the substituted arms on imidazole-4,5-dicarboxylic acid, a novel 3D CP, 2 containing 2D 63 cobalt–carboxyl layer was obtained. A combination of Quantum Monte Carlo (QMC) simulations and the first-principles Density functional theory (DFT) calculations showed that compound 2 features weak ferro- and antiferro-magnetic coupling mechanisms with two different super-exchange paths of −/+/− for synanti carboxylate bridges and −/−/− for synsyn carboxylate bridges. Through HF-EPR measurements performed on polycrystalline samples over the frequency range of 60–260 GHz and field range of 0–12 T, the effective g-values of 1 and 2 were all larger than 2.00, and the signs of their D values were probably positive.

Graphical abstract: Embedding 1D or 2D cobalt–carboxylate substrates in 3D coordination polymers exhibiting slow magnetic relaxation behaviors: crystal structures, high-field EPR, and magnetic studies

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Publication details

The article was received on 16 Jan 2017, accepted on 13 Mar 2017 and first published on 13 Mar 2017


Article type: Paper
DOI: 10.1039/C7DT00168A
Citation: Dalton Trans., 2017,46, 4786-4795
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    Embedding 1D or 2D cobalt–carboxylate substrates in 3D coordination polymers exhibiting slow magnetic relaxation behaviors: crystal structures, high-field EPR, and magnetic studies

    N. Mao, B. Zhang, F. Yu, X. Chen, G. Zhuang, Z. Wang, Z. Ouyang, T. Zhang and B. Li, Dalton Trans., 2017, 46, 4786
    DOI: 10.1039/C7DT00168A

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