Magnetic Properties of the Single Crystals of Layered Cu(II) and Co(II) Complexes with 3-Imidazoline Nitroxides

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 (HL 1 ) and 4-(2′-methoxycarbonyl-2′-oxoethylidene)-2,2,5,5-tetramethyl-3-imidazoline-1-oxyl (HL 2 ) have been investigated by the static magnetic sus...

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Bibliographic Details
Published in:Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals Molecular crystals and liquid crystals, 1999-09, Vol.334 (1), p.405-414
Main Authors: Shvedenkov, Yuri, Ikorskii, Vladimir, Romanenko, Galina, Fursova, Elena, Ovcharenko, Victor
Format: Article
Language:English
Subjects:
ferromagnetic ordering
magnetic susceptibility
single crystal
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Summary: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 (HL 1 ) and 4-(2′-methoxycarbonyl-2′-oxoethylidene)-2,2,5,5-tetramethyl-3-imidazoline-1-oxyl (HL 2 ) have been investigated by the static magnetic susceptibility method. It was found that bulk ferromagnetic ordering is inherent in layered CuL 1 2 and α-CuL 2 2 at ∼ 5 K. Easy magnetization axes were determined for both compounds. At the same time, the complex β-CuL 2 2 , possessing a molecular structure, does not show noticeable anisotropy in the region 2-300 K. For the layered complex CoL 1 2 , the magnetic transition temperature, if any, is lower than 2 K. In the whole range 2-300 K, the single crystals of CoL 1 2 show a rather high anisotropy of magnetic susceptibility.
ISSN:1058-725X
DOI:10.1080/10587259908023338