期刊
JOURNAL OF MATERIALS CHEMISTRY C
卷 4, 期 33, 页码 7798-7808出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6tc02234k
关键词
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资金
- National Natural Science Foundation of China [21373162, 21473135, 21073142, 21203149, 21173168]
- Natural Science Foundation of Shanxi Province [2015JQ2053, 11JS110, 2013JM2002, SJ08B09]
- open funding of Wuhan National High Magnetic Field Centre
- NSF [DMR-1157490]
- State of Florida
- US Department of Energy
Based on the 1H-3-(3-pyridyl)-5-(3'-pyridyl)-1,2,4-triazole (3,3'-Hbpt) ligand, {[Co(3,3'-Hbpt)(2)(SCN)(2)]center dot 2H(2)O}(n) (1) and {[Ni(3,3'-Hbpt)(2)(SCN)(2)]center dot 2H(2)O}(n) (2) have been prepared and structurally determined by single-crystal X-ray crystallography. The Co(II)/Ni(II) ions are bridged by the curved 3,3'-Hbpt ligands to generate helix chains, further forming a two-dimensional (2D) sheet in which Co(II)/Ni(II) ions are spatially separated from each other by a long spacer 3,3'-Hbpt ligand. Alternating-current magnetic susceptibility measurements show that the individual octahedral Co(II) ions in 1 exhibit field-induced slow magnetic relaxation, dominated by a Raman-like process. Compound 1 exhibits a very large positive axial anisotropy parameter (D = +70.1 cm(-1)) and a small transverse anisotropy parameter (vertical bar E vertical bar = 0.7 cm(-1)) by analysis of direct current magnetic data, which are further confirmed by high-field electron paramagnetic resonance (HF-EPR) spectroscopy and ab initio calculations. Furthermore, the semiconducting behaviors of 1 and 2 were also studied, which could be used as wide-gap semiconductors.
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