期刊
RUSSIAN CHEMICAL BULLETIN
卷 60, 期 5, 页码 809-815出版社
SPRINGER
DOI: 10.1007/s11172-011-0129-4
关键词
cobalt; semiquinolates; nitroxides; X-ray diffraction analysis; valence tautomerism; magnetochemistry
资金
- Russian Foundation for Basic Research [08-03-00038, 08-03-00025, 09-03-12108]
- Council on Grants at the President of the Russian Federation [MK-3112.2011.3]
- Presidium of the Russian Academy of Sciences [7.16]
- Ural Branch of the Russian Academy of Sciences [47]
- Siberian Branch of the Russian Academy of Sciences [47]
Heterospin complexes based on cobalt semiquinolate with stable nitroxides of composition [Co(SQ)(2)(NIT)(2)]center dot 8CH(2)Cl(2), [Co(SQ)(2)(NIT)(2)]center dot 4MeCN, [Co(SQ)(2)(IN)(2)]center dot 5Me(2)CO, [Co(SQ)(2)(IN)(2)]center dot 4MeCN, and [Co(SQ)(2)(IN)(2)]center dot 2CH(2)Cl(2)center dot C6H14, where SQ is 3,6-di-tert-butyl-o-benzosemiquinolate, NIT is 4,4,5,5-tetramethyl-2-(1-methyl-1H-imidazol-5-yl)-4,5-dihydro-1H-imidazole-3-oxide-1-oxyl, and IN is the imine analog of NIT, viz., 4,4,5,5-tetramethyl-2-(1-methyl-1H-imidazol-5-yl)-4,5-dihydro-1H-imidazole-1-oxyl, were synthesized. The characteristic feature of these compounds is that they contain two different types of paramagnetic organic ligands. The X-ray diffraction study showed that the solid phases of the complexes have a molecular structure. According to the data from thermomagnetic analysis (2-350 K), all complexes exhibit effects of valence tautomerism at similar to 20 A degrees C. It was found that incorporated solvent molecules have an effect on the magnetic anomaly temperature.
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