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CAS: 1611002-32-4
MF: C13H13N5O3
MW: 287.27402
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Jinkui Tang

Changchun Institute of Applied Chemistry
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Unique Y-shaped lanthanide aggregates and single-molecule magnet behaviour for the Dy4 analogue
Co-reporter: Shufang Xue, Yun-Nan Guo, Lang Zhao, Peng Zhang and Jinkui Tang  
pp: 1564-1570
Publication Date(Web):08 Oct 2013
DOI: 10.1039/C3DT52444B
The assembly of N′-(amino-(pyrimidin-2-yl)methylene)-o-vanilloyl hydrazine ligands (H2L, Scheme 1) with different lanthanide perchlorates produces novel Y-shaped tetranuclear complexes, [Ln4(μ3-OH)(L2−)4(H2O)6]·(ClO4)3·6H2O, where Ln = Tb (1), Dy (2) and Ho (3). The formation of this unprecedented Y-shaped topology is largely ascribed to the versatility of the mixed-donor hydrazone ligands in terms of their potential denticity. Analysis of the susceptibility data shows that only the Dy-based molecule features SMM-like behaviour. The synthetic methodology of employing H2L and related ligands has provided a very promising route towards new families of magnetic coordination clusters with novel metal topologies and properties.
Unique Y-shaped lanthanide aggregates and single-molecule magnet behaviour for the Dy4 analogue
Co-reporter: Shufang Xue, Yun-Nan Guo, Lang Zhao, Peng Zhang and Jinkui Tang
pp: NaN1570-1570
Publication Date(Web):2013/10/08
DOI: 10.1039/C3DT52444B
The assembly of N′-(amino-(pyrimidin-2-yl)methylene)-o-vanilloyl hydrazine ligands (H2L, Scheme 1) with different lanthanide perchlorates produces novel Y-shaped tetranuclear complexes, [Ln4(μ3-OH)(L2−)4(H2O)6]·(ClO4)3·6H2O, where Ln = Tb (1), Dy (2) and Ho (3). The formation of this unprecedented Y-shaped topology is largely ascribed to the versatility of the mixed-donor hydrazone ligands in terms of their potential denticity. Analysis of the susceptibility data shows that only the Dy-based molecule features SMM-like behaviour. The synthetic methodology of employing H2L and related ligands has provided a very promising route towards new families of magnetic coordination clusters with novel metal topologies and properties.
Tuning the Magnetic Interactions and Relaxation Dynamics of Dy2 Single-Molecule Magnets
Co-reporter: Shufang Xue;Dr. Yun-Nan Guo;Dr. Liviu Ungur;Dr. Jinkui Tang;Dr. Liviu F. Chibotaru
pp: 14099-14106
Publication Date(Web):
DOI: 10.1002/chem.201501866

Abstract

Efficient modulation of single-molecule magnet (SMM) behavior was realized by deliberate structural modification of the Dy2 cores of [Dy2(a′povh)2(OAc)2(DMF)2] (1) and [Zn2Dy2(a′povh)2(OAc)6]⋅4 H2O (2; H2a′povh=N′-[amino(pyrimidin-2-yl)methylene]-o-vanilloyl hydrazine). Compound 1 having fourfold linkage between the two dysprosium ions shows high-performance SMM behavior with a thermal energy barrier of 322.1 K, whereas only slow relaxation is observed for compound 2 with only twofold connection between the dysprosium ions. This remarkable discrepancy is mainly because of strong axiality in 1 due to one pronounced covalent bond, as revealed by experimental and theoretical investigations. The significant antiferromagnetic interaction derived from bis(μ2-O) and two acetate bridging groups was found to be crucial in leading to a nonmagnetic ground state in 1, by suppressing zero-field quantum tunneling of magnetization.