| Title | Lanthanide dinuclear complexes constructed from mixed oxygen-donor ligands: the effect of substituent positions of the neutral ligand on the magnetic dynamics in Dy analogues |
| Authors | Zhu, Wen-Hua Li, Shan Gao, Chen Xiong, Xia Zhang, Yan Liu, Li Powell, Annie K. Gao, Song |
| Affiliation | Hubei Univ, Coll Chem & Chem Engn, Hubei Collaborat Innovat Ctr Adv Organ Chem Mat, Minist Educ,Key Lab Synth & Applicat Organ Funct, Wuhan 430062, Peoples R China. Peking Univ, Coll Chem & Mol Engn, State Key Lab Rare Earth Mat Chem & Applicat, Beijing Natl Lab Mol Sci, 5 Yiheyuan Rd, Beijing 100871, Peoples R China. Karlsruhe Inst Technol, Inst Inorgan Chem, Engesserstr 15, D-76131 Karlsruhe, Germany. Hubei Univ, Coll Chem & Chem Engn, Hubei Collaborat Innovat Ctr Adv Organ Chem Mat, Minist Educ,Key Lab Synth & Applicat Organ Funct, Wuhan 430062, Peoples R China. Gao, S (reprint author), Peking Univ, Coll Chem & Mol Engn, State Key Lab Rare Earth Mat Chem & Applicat, Beijing Natl Lab Mol Sci, 5 Yiheyuan Rd, Beijing 100871, Peoples R China. |
| Keywords | SINGLE-MOLECULE MAGNETS ION MAGNET SLOW RELAXATION BEHAVIOR LUMINESCENCE SYMMETRY DYSPROSIUM(III) BLOCKING EXCHANGE DILUTION |
| Issue Date | 2016 |
| Publisher | DALTON TRANSACTIONS |
| Citation | DALTON TRANSACTIONS.2016,45,(11),4614-4621. |
| Abstract | Two series of lanthanide dinuclear complexes with the general formulae, [Ln(n-PNO)(Bza)(3)(H2O)] {Bza = benzoic acid; n = 3, n-PNO = 3-picoline N-oxide, Dy(1) and Er(2); and n = 4, n-PNO = 4-picoline N-oxide, Nd(3), Eu(4), Gd(5), Tb(6), Dy(7), Er(8) and Y(9)} have been successfully synthesized by the hydrothermal method. Single-crystal X-ray diffraction experiments illustrate that the two series of compounds possess similar carboxylic ligand-bridged dinuclear structure and coordination geometry around the lanthanide ions despite the different methyl-substituent positions on the neutral ligand. Comparative studies of the Dy analogues in the static-field measurements reveal only a little difference with a small butterfly-shaped opening for complex 1 and a close hysteresis loop for 7 at 2.0 K. However, systematic investigations of the alternating-current (ac) measurements indicate that the different substituent positions of the picoline N-oxide ligand have a significant effect on the magnetic relaxation dynamics. A more substantial suppression of the quantum tunnelling of magnetization (QTM) effect and pronounced slow magnetic relaxation were observed in complex 7 as compared to 1 under both zero and a 1 kOe static field. |
| URI | http://hdl.handle.net/20.500.11897/437919 |
| ISSN | 1477-9226 |
| DOI | 10.1039/c5dt04850h |
| Indexed | SCI(E) EI |
| Appears in Collections: | å å¦ä¸ å å å·¥ç¨ å¦é ¢ 稀土材料化学与应用国家重点实验室 |
