Abstract
Two seven-coordinate cobalt(II) complexes with the molecular formulae [Co(L)(NO3)2(CH3CN)] (L = 2,2′-bipyridine, 1; L = 1,10-phenanthroline, 2) were prepared and magnetically characterized. X-ray single crystal diffraction shows that 1 exhibit the distorted pentagonal bipyramidal geometry around the central Co(II) ion, similar to 2. Magnetic anisotropies and single-molecule magnet behaviors of 1 and 2 have been studied by direct and alternating current magnetic measurements. The static magnetic data show the easy-plane magnetic anisotropies with positive zero-field splitting D value of 32.9(2) cm−1 for 1 and 31.4(2) cm−1 for 2, which are confirmed by theoretical calculations by CASPT2 and DDCI3 methods. Both 1 and 2 display the field-induced slow magnetic relaxation under 0.1 T applied dc field.
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