2D and 3D Cu(hfac)2 complexes with nitronyl nitroxide biradicals

Eugene Tretyakov, Sergei Fokin, Galina Romanenko, Vladimir Ikorskii, Sergei Vasilevsky, Victor Ovcharenko

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52 Citations (Scopus)


Reactions between Cu(hfac)2 and nitronyl nitroxide biradicals 1,4-bis[4-(4,4,5,5-tetramethyl-3-oxide-1-oxyl-4,5-dihydro-1H-imidazol-2-yl) pyrazol-1-yl]butane (L4) and 1,8-bis[4-(4,4,5,5-tetramethyl-3-oxide- 1-oxyl-4,5-dihydro-1H-imidazol-2-yl)pyrazol-1-yl]octane (L8) gave respectively a framework compound [Cu(hfac)2]2L 4 and a layered polymer compound [Cu(hfac)2] 2L8. The framework of [Cu(hfac)2] 2L4 consists of 66-membered condensed metallocycles. Inside the framework, the structure has macrohelixes (pitch ∼25 Å) extending along the [001] crystallographic direction. All the helixes have the same direction of winding; the crystals, therefore, are optically active, the structure corresponding either to P-isomer (P41212) or to M-isomer (P43212). The long distances between the Cu atoms and the O atoms of the coordinated >N-O groups (Cu-O 2.351-2.467 Å) are responsible for ferromagnetic exchange interactions in Cu 2+-O-.N< and >N-.O-Cu2+-O- .N< exchange clusters.

Original languageEnglish
Pages (from-to)3671-3678
Number of pages8
JournalInorganic Chemistry
Issue number9
Publication statusPublished - 1 May 2006
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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