Synthesis, crystal structure, and magnetic properties of a new one-dimensional chain antiferromagnet Co(ox)(bib)•H2O (ox = oxalate; bib=1,4-bis(imidazole-1-yl)benzene)

A new one-dimensional (1D) chain antiferromagnet Co(ox)(bib)center dot H2O (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 X-ray 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.

Automated summary

A new one-dimensional antiferromagnet Co(ox)(bib)center dot H2O has been successfully synthesized and characterized. The magnetic susceptibility and heat capacity results indicate that this material exhibits good one-dimensional magnetism.