Chemistry Journal of Moldova

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

Author(s):

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


Field: Inorganic and coordination chemistry
Type: Research paper
Issue: 2006 Volume 1, no.1
Pages: 77-83
Keywords:

{Fe4O2} core; Homotetranuclear carboxylate; Crystal structure; Antiferromagnetic exchange.


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Abstract (JPEG)

DOI:
dx.doi.org/10.19261/cjm.2006.01(1).09

Graphical Abstract:
 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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