Journal
NANO RESEARCH
Volume 16, Issue 2, Pages 3552-3557Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s1227-1-022-5206-5
Keywords
1,4-bis(imidazole-1-yl)benzene; antiferromagnetic; cobalt; chain structure; oxalate
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A new one-dimensional chain antiferromagnet Co(ox)(bib)·H2O 1 has been successfully synthesized and characterized. The compound exhibits a good 1D magnetism with strong antiferromagnetic interactions along the spin chains. However, no long-range order is observed due to weak interchain interactions.
A new one-dimensional (1D) chain antiferromagnet Co(ox)(bib)center dot H2O 1 (ox = oxalate; bib = 1,4-bis(imidazole-1-yl)benzene) has been successfully synthesized under hydrothermal condition and characterized by single crystal X-ray crystallography, powder Xray diffraction, thermogravimetric analysis, Fourier transform infrared (FTIR) spectroscopy, magnetic susceptibility, and heat capacity measurements. The Co-II ion is connected by oxalate ions in trans -configuration to form 1D Co-II-ox-Co-II spin chains, which are further separated by the long organic molecule bib. The magnetic susceptibility curve shows that 1 exhibits a feature of broad maximum around 29 K, indicating strong antiferromagnetic interactions with short spin -spin correlations along the spin chains. However, no long-range order is observed due to the negligible interchain interactions through bib ligand and weak hydrogen bonds, which is further confirmed by the heat capacity data. The intrachain interaction J of -8.4 K is estimated. Both magnetic susceptibility and heat capacity results indicate that 1 exhibits a good 1D magnetism.
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