期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 5, 期 36, 页码 9488-9495出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7tc02786a
关键词
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资金
- National Natural Science Foundation of China [21373162, 21673180, 21727805, 21673181, 21605121, 21671003, 21473135]
- Natural Science Foundation of Jiangsu Province of China [BK20151542]
Based on isomeric ligands, (2,4'-Hpcad = N-3-(2-pyridoyl)-4-pyridinecarboxamidrazone and 2,3'-Hpcad = N-3-(2-pyridoyl)-3-pyridinecarboxamidrazone), two carboxylate-bridged centrosymmetric Dy-III dimers, [Dy-2(2,4'-pcad)(2)(C2H3O2)(4)(H2O)(2)].4H(2)O (1) and [Dy-2(2,3'-pcad)(2)(C2H3O2)(4)(H2O)(2)] (2), were obtained, where Dy-III ions adopted a monocapped square antiprism coordination geometry, but exhibiting different distortions. Fine-tuning the structure on using isomeric ligands had a significant impact on the magnetic properties of compounds 1 and 2. Magnetic studies revealed that 1 and 2 exhibit slow magnetic relaxation behaviours under a zero direct-current field exhibiting effective energy barriers (U-eff) of 53.5 K and 132.6 K, respectively, wherein compound 2 possesses the highest U-eff in nine-coordinated Dy-2 compounds. Ab initio calculations of compound 2 for magnetic interactions, magnetic axes inclination and charge distribution around Dy-III ions revealed simultaneous optimization of f-f interactions between the Dy-III ions and the stronger ligand field axis of individual Dy-III ion, which realizes excellent performance of 2. These findings demonstrate an efficient approach to enhancing the magnetic anisotropy barrier on using isomeric ligands.
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