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Ultima descărcare din IBN: 2017-03-17 10:01 |
SM ISO690:2012 PRODIUS, Denis, MERIAKRE, V., SHOVA, Sergiu, GDANIEC, Maria, SIMONOV, Yurii A., SORACE, Lorenzo, CANESCHI, Andrea, STANICA, Nicolae, GERU, Ion, TURTA, Constantin. The synthesis and study of tetranuclear cluster [Fe4O2(CCl3COO)8(THF)2(DMF)(H2O)]⋅THF. In: Chemistry Journal of Moldova, 2006, nr. 1(1), pp. 77-83. ISSN 1857-1727. DOI: https://doi.org/10.19261/cjm.2006.01(1).09 |
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Chemistry Journal of Moldova | |
Numărul 1(1) / 2006 / ISSN 1857-1727 /ISSNe 2345-1688 | |
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DOI: https://doi.org/10.19261/cjm.2006.01(1).09 | |
Pag. 77-83 | |
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Rezumat | |
The novel bis(µ3-oxo) tetranuclear trichloracetate cluster, [Fe4
O2(CCl3 COO)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 = -2J wb(Ŝ1 Ŝ2 Ŝ2 Ŝ3 Ŝ3 Ŝ4 Ŝ4 Ŝ1) - 2J bbŜ2 Ŝ4v gµβ(Ŝ1z Ŝ2z Ŝ3z Ŝ4z)B, the fitting parameters J bb = - 14.3 cm-1, J wb = - 32.1 cm-1 , g = 2.07, ρparam.impur. = 4.2 %, ΘCurie-Weiss const. = -0.5 Kand R= 6.8·10-5 were obtained.
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Cuvinte-cheie {Fe4 O2} core, Homotetranuclear carboxylate, Antiferromagnetic exchange, crystal structure |
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