Abstract
Two mononuclear cobalt(II) complexes containing four equatorial 4‐benzylpyridine and two axial chlorido and/or thiocyanato ligands {[Co[L]4X2]; X = Cl or NCS} possess easy plane magnetic anisotropy, as determined by magnetic susceptibility and magnetization analyses, and confirmed by ab initio calculations (D = +106 and +95 cm–1). AC susceptibility measurements show a slow magnetic relaxation with two or three relaxation branches. The low‐frequency pathway occurs at about 1–10 Hz, and it disappears progressively upon heating. The high‐frequency mode exists at frequency ranges above 500 Hz. The characteristics of these field‐induced single‐molecule magnets strongly depend upon the applied magnetic field, which causes a prolongation of the low‐frequency relaxation time and a shortening of the high‐frequency one. At 1.0 T and 1.9 K the relaxation time for the low‐frequency pathway is as slow as 756 or 164 ms for X = Cl or X = NCS, respectively.
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