Dominance of Cyclobutadienyl Over Cyclopentadienyl in the Crystal Field Splitting in Dysprosium Single-Molecule Magnets.
Dominance of Cyclobutadienyl Over Cyclopentadienyl in the Crystal Field Splitting in Dysprosium Single-Molecule Magnets.
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镝单分子磁体中,环丁二烯基相对于环戊二烯基在晶体场分裂中的主导地位
DOI:
10.1002/anie.202200525
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发表时间:
2022-04-19
影响因子:
16.6
通讯作者:
Layfield, Richard A.
中科院分区:
文献类型:
--
作者:
Durrant, James P.;Day, Benjamin M.;Tang, Jinkui;Mansikkamaki, Akseli;Layfield, Richard A.
关键词:
Replacing a monoanionic cyclopentadienyl (Cp) ligand in dysprosium single‐molecule magnets (SMMs) with a dianionic cyclobutadienyl (Cb) ligand in the sandwich complexes [(η4‐Cb′′′′)Dy(η5‐C5Me4 t Bu)(BH4)]− (1), [(η4‐Cb′′′′)Dy(η8‐Pn†)K(THF)] (2) and [(η4‐Cb′′′′)Dy(η8‐Pn†)]− (3) leads to larger energy barriers to magnetization reversal (Cb′′′′=C4(SiMe3)4, Pn†=1,4‐di(tri‐isopropylsilyl)pentalenyl). Short distances to the Cb′′′′ ligands and longer distances to the Cp ligands in 1–3 are consistent with the crystal field splitting being dominated by the former. Theoretical analysis shows that the magnetic axes in the ground Kramers doublets of 1–3 are oriented towards the Cb′′′′ ligands. The theoretical axiality parameter and the relative axiality parameter Z and Z rel are introduced to facilitate comparisons of the SMM performance of 1–3 with a benchmark SMM. Increases in Z and Z rel when Cb′′′ replaces Cp signposts a route to SMMs with properties that could surpass leading systems. Cyclobutadienyl ligands produce stronger crystal field splitting than cyclopentadienyl ligands in dysprosium organometallic sandwich complexes, leading to improved performance as single‐molecule magnets.
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影响因子:
21.8
作者:
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通讯作者:
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影响因子:
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影响因子:
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作者:
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通讯作者:
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影响因子:
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作者:
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通讯作者:
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