Abstract
Single crystals of Cu(II) and Co(II) complexes with stable nitroxides 4-(2′-ethoxycarbonyl-2′-oxoethylidene)-2,2,5,5-tetramethyl-3-imidazoline-1-oxyl (HL1) and 4-(2′-methoxycarbonyl-2′-oxoethylidene)-2,2,5,5-tetramethyl-3-imidazoline-1-oxyl (HL2) have been investigated by the static magnetic susceptibility method. It was found that bulk ferromagnetic ordering is inherent in layered CuL1 2 and α-CuL2 2 at ∼ 5 K. Easy magnetization axes were determined for both compounds. At the same time, the complex β-CuL2 2, possessing a molecular structure, does not show noticeable anisotropy in the region 2–300 K. For the layered complex CoL1 2, the magnetic transition temperature, if any, is lower than 2 K. In the whole range 2–300 K, the single crystals of CoL1 2 show a rather high anisotropy of magnetic susceptibility.
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