2010/01/01 by Catalin Maxim, Lorenzo Sorace, Panchanana Khuntia +7 · 1 citation
Chemistry · Materials Science · Physics and Astronomy · #Magnetism in coordination complexes #Metal-Catalyzed Oxygenation Mechanisms #Organometallic Complex Synthesis and Catalysis #cond-mat.mes-hall #cond-mat.mtrl-sci #physics.chem-ph
paper · pdf · doi:10.1039/b924505g
published as Dalton Transaction 39, 4838 (2010)
openalex publication_date 2010/01/01 · arxiv created 2010/06/03 · arxiv updated 2010/06/04 · openalex created_date 2019/06/27 · openalex updated_date 2026/07/28
Three isostructural cyanido-bridged heptanuclear complexes, [Cu(II)(saldmen)(H₂O)₆M(III)(CN)₆]-(ClO₄)₃·8H₂O (M= Fe(III) 2; Co(III), 3; Cr(III) 4), have been obtained by reacting the dinuclear copper(II) complex, [Cu₂(saldmen)₂(μ-H₂O)(H₂O)₂](ClO₄)₂·2H₂O 1, with K₃[Co(CN)₆], K₄[Fe(CN)₆], and K₃[Cr(CN)₆], respectively (Hsaldmen is the Schiff base resulting from the condensation of salicylaldehyde with N,N-dimethylethylenediamine). A unique octameric water cluster, with bicyclo[2,2,2]octane-like structure, is sandwiched between the heptanuclear cations in 2, 3 and 4. The cryomagnetic investigations of compounds 2 and 4 reveal ferromagnetic couplings of the central Fe(III) or Cr(III) ions with the Cu(II) ions (J(CuFe) = +0.87 cm⁻¹, J(CuCr) = +30.4 cm⁻¹). The intramolecular Cu···Cu exchange interaction in 3, across the diamagnetic cobalt(III) ion, is -0.3 cm⁻¹. The solid-state ¹H-NMR spectra of compounds 2 and 3 have been investigated.