The novel bis(?3-oxo) tetranuclear trichloracetate cluster, [Fe4O2(CCl3COO)8(THF)2(DMF)(H2O)]?THF (1), has been synthesised and subsequently characterised by X-ray structure analysis, magnetic measurements and infra red (IR). The structure of cluster is “butterfly” type. The Fe···Fe separation has the value of 2.883(1) - 3.441(7) Å. The coordination number of iron (III) is 6. Magnetic studies reveal the presence of an antiferromagnetic exchange in the parallelogram skeletons of the tetranuclear species. Using the spin Hamiltonian H = -2Jwb(?1?2 + ?2?3 + ?3?4 + ?4?1) - 2Jbb?2?4v+ g??(?1z + ?2z +?3z + ?4z)B, the fitting parameters Jbb = - 14.3 cm-1, Jwb = - 32.1 cm-1 , g = 2.07, ?param. -5 impur. = 4.2 %, ?Curie-Weiss const. = -0.5 K and R = 6.8·10 were obtained.
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Author Name: Denis Prodius, Valeriu Mereacre, Sergiu Shova, Maria Gdaniec, Yurii Simonov, Lorenzo Sorace, Andrea Caneschi, Nicolae Stanica, Ion Geru, Constantin Turta
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Keywords: {Fe4O2} core; Homotetranuclear carboxylate; Crystal structure; Antiferro magnetic exchange .
ISSN: 1857-1727
EISSN: 2345-1688
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