Detailed Magnetic Studies on Co(N<sub>3</sub>)<sub>2</sub>(4-acetylpyridine)<sub>2</sub>: a Weak-Ferromagnet with a Very Big Canting Angle
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The magnetic properties of Co(N3)2(4acpy)2 have been thoroughly reexamined on both powder and well-oriented single crystal samples. This azido-bridged cobalt compound of (4, 4) layer shows a weak-ferromagnetic state below TC = 11.2 K. The magnetic axes were determined to be along the crystallographic a*, b, and c axes for the monoclinic space group P21/c. The easy axis lies along the b-axis, the canting is along the a*-axis, and the hard axis is along the c-axis. Strong anisotropy due to the oriented moments in the ordered state and/or the single-ion anisotropy of Co2+ exists in the whole temperature range from 2 to 300 K. Below TC, very big spontaneous magnetization was observed and was attributed to the very big canting angle (15° at 2 K). A possible spin configuration was then proposed to explain the experimental results. The origin of the big spin canting was discussed, and a weak-ferromagnetic approach toward molecular magnets with big spontaneous magnetization was proposed accordingly.
