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Ferro- and antiferromagnetic interactions in polymeric and molecular complexes of Cu(hfac)2 with 1-oxoazin-2-yl-substituted nitronyl nitroxides |
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| Authors: | Oleg N ChupakhinEvgeny V Tretyakov Irina A UtepovaMikhail V Varaksin Galina V RomanenkoArtem S Bogomyakov Sergey L VeberVictor I Ovcharenko |
| Institution: | a Postovsky Institute of Organic Synthesis, Ural Branch of the Russian Academy of Sciences, S. Kovalevskoy Str., 20/22, 620990 Ekaterinburg, Russian Federation b International Tomography Center, Siberian Branch, Russian Academy of Sciences, Institutskaya Str., 3a, 630090 Novosibirsk, Russian Federation c Ural Federal University, 19 Mira Str., 620002 Ekaterinburg, Russian Federation |
| Abstract: | Solid heterospin compounds based on Cu(hfac)2 complexes with a new group of nitronyl nitroxides bearing different azine-N-oxide substituents at position 2 of the 2-imidazoline ring (Ln) were studied. The major factor responsible for the change in the magnetic characteristics of the Cu(hfac)2L1] complex with triazine nitronyl nitroxide with temperature was shown to be the specific pairwise packing of heterospin molecules with the dominant antiferromagnetic exchange between the radical fragments of adjacent molecules. For complexes of Cu(hfac)2 with 1-oxoazin-2-yl-substituted nitronyl nitroxides L2 and L4, 7-membered metallocycles were obtained, although they form rarely. It was shown that polymer chains formed in the solid complex with spin-labeled pyrazine-N-oxide (Cu(hfac)2)3(L3)2] due to the cross-linking of {(Cu(hfac)2)2(L3)2} binuclear fragments via the bridging Cu(hfac)2]. |
| Keywords: | Nitronyl nitroxides Azine-N-oxides Copper complexes |
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