Journal
INORGANIC CHEMISTRY
Volume 58, Issue 2, Pages 1191-1200Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.8b02637
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Funding
- National Natural Science Foundation of China [21661009, 51572050, 11774178]
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources (Guangxi Normal University) [CMEMR2017-A11]
- Guangxi Natural Science Foundation of China [2013GXNSFGA019008, 2015GXNSFDA139007]
- Innovation Project of Guangxi Graduate Education [XYCSZ2018068]
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To develop new lanthanide single-molecule magnets (SMMs), two new complexes of [Dy-2(MOH)(2)(HL1)(2)(NO3)(2)].2MeOH (1) and [Dy-6(mu(3)-OH)(2)(L-2)(2)(HL2)(2)(H2L2)(2)Cl-2(EtOH)(2)]Cl-2.3EtOH.CH3CN (2) were obtained by reacting Dy(NO)(3).6H(2)O with 3-amino1,2-propanediol in the presence of 2-hydroxynaphthaldehyde for 1 and by reacting DyCl3.6H(2)O with 1,1-di(hydroxymethy1)pethylamine in the presence of 2-hydroxynaphthaldehyde for 2, respectively, in which the Schiff base ligands of 3-(((2-hydroxynaphthaen-l-yl)methylene)amino)propane-1,2-diol (H3L1) and 2-(beta-naphthalideneamino)-2-(hydroxylmethyl)-1-propanol (H3L2) were in situ formed. The two Dy(III) ions in 1 are linked by two O-alkoxy atoms of two (HL1)(2-)ligands to build a dinuclear skeleton. Complex 2 presents a nearly planar hexanuclear skeleton constructed from four edge-shared triangular Dy-3 units with the two peripheral Dy-3 units consolidated by two mu(3)-O bridges and the two central Dy3 units consolidated by one mu(3)-O bridge. Obviously, they exhibit a different topological arrangement resulting from the linkage of the Schiff base ligands. Both of them are typical SMMs under zero dc fields, with a U-eff/k(B) value of 34 K for 1 and 40 K for 2, respectively. Multiple processes are involved in the relaxation processes of 1 and 2. The different SMM performances of the two titled complexes reveal a tuning effect of Schiff base ligands through tuning the coordination environments and topological arrangements of dysprosium(III) ions, which is supported by the theoretical calculations.
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