Chemistry Journal of Moldova: General, Industrial and Ecological Chemistry (Jun 2006)

THE SYNTHESIS AND STUDY OF TETRANUCLEAR CLUSTER [Fe4O2(CCl3COO)8(THF)2(DMF)(H2O)]⋅THF

  • Denis Prodius,
  • Valeriu Mereacre,
  • Sergiu Shova,
  • Maria Gdaniec,
  • Yurii Simonov,
  • Lorenzo Sorace,
  • Andrea Caneschi,
  • Nicolae Stanica,
  • Ion Geru,
  • Constantin Turta

Journal volume & issue
Vol. 1, no. 1
pp. 77 – 83

Abstract

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The novel bis(μ3-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(Ŝ1Ŝ2 + Ŝ2Ŝ3 + Ŝ3Ŝ4 + Ŝ4Ŝ1) - 2JbbŜ2Ŝ4v+ gμβ(Ŝ1z + Ŝ2z +Ŝ3z + Ŝ4z)B, the fitting parameters Jbb = - 14.3 cm-1, Jwb = - 32.1 cm-1 , g = 2.07, ρparam. -5 impur. = 4.2 %, ΘCurie-Weiss const. = -0.5 K and R = 6.8·10 were obtained.

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