TY - JOUR
T1 - Effect of bridging ligands on magnetic behavior in dinuclear dysprosium cores supported by polyoxometalates
AU - Huo, Yu
AU - Chen, Yan-Cong
AU - Wu, Si-Guo
AU - Liu, Jun-Liang
AU - Jia, Jian-Hua
AU - Chen, Wen-Bin
AU - Wang, Bao-Lin
AU - Zhang, Yi-Quan
AU - Tong, Ming-Liang
PY - 2019
Y1 - 2019
N2 - A family of dinuclear dysprosium cores bridged by different ligands within a polyoxometalates (POMs) framework, (TBA)8.5H1.5[(PW11O39)2Dy2X2(H2O)2]·6H2O (X = OH (1), F (2), OAc (3); TBA = tetra-n-butylammonium), was successfully synthesized and structurally characterized. Magnetic studies indicate that the bridging ligands can significantly affect the magnetic behaviors, with 1 and 3 showing antiferromagnetic coupling and 2 bridged by fluoride ions showing ferromagnetic interaction. 1 and 2 behaved as singlemolecule magnets (SMMs) with the thermally activated energy barrier of 98(5) and 74(6) cm−1 under zero dc filed, respectively, whereas no SMM behavior was observed for 3 bridged by two μ-η1 :η2 -acetato ligands. Notably, the low-temperature fluorescence spectra of 1−3 provide valuable information on the energy levels, which are consistent with the anisotropic barriers determined by magnetic measurements. These results offer an insight into the magneto-optical correlation. Furthermore, the effective energy barrier of 1 reaches a breakthrough among all POM-based SMMs.
AB - A family of dinuclear dysprosium cores bridged by different ligands within a polyoxometalates (POMs) framework, (TBA)8.5H1.5[(PW11O39)2Dy2X2(H2O)2]·6H2O (X = OH (1), F (2), OAc (3); TBA = tetra-n-butylammonium), was successfully synthesized and structurally characterized. Magnetic studies indicate that the bridging ligands can significantly affect the magnetic behaviors, with 1 and 3 showing antiferromagnetic coupling and 2 bridged by fluoride ions showing ferromagnetic interaction. 1 and 2 behaved as singlemolecule magnets (SMMs) with the thermally activated energy barrier of 98(5) and 74(6) cm−1 under zero dc filed, respectively, whereas no SMM behavior was observed for 3 bridged by two μ-η1 :η2 -acetato ligands. Notably, the low-temperature fluorescence spectra of 1−3 provide valuable information on the energy levels, which are consistent with the anisotropic barriers determined by magnetic measurements. These results offer an insight into the magneto-optical correlation. Furthermore, the effective energy barrier of 1 reaches a breakthrough among all POM-based SMMs.
UR - https://hdl.handle.net/1959.7/uws:65991
U2 - 10.1021/acs.inorgchem.8b02788
DO - 10.1021/acs.inorgchem.8b02788
M3 - Article
SN - 0020-1669
VL - 58
SP - 1301
EP - 1308
JO - Inorganic Chemistry
JF - Inorganic Chemistry
IS - 2
ER -