Abstract
A novel octairon(III) citrate complex, (Him)9[Fe8(μ3-O)2(μ2-OH)2(cit)6(CH3CO2)2(im)2](ClO4)·13H2O has been obtained from DMF solution, by reacting ferric perchlorate, citric acid and imidazole in a 1 ∶ 1 ∶ 5 ratio. This compound crystallizes in the monoclinic space group P21/n with a = 15.271(1), b = 19.940(1), c = 44.197(1) Å, β = 91.965(1)°, V = 13450.2(9) Å3 and Z = 4. The complex consists of two equivalent tetranuclear units, which are not symmetrically related and are linked together by two of the six tetraionized citrate ligands. The iron(III) ions are antiferromagnetically coupled. Assumption of a four S = 5/2 spin system based on H = −2Σi < j JijSiSj leads to satisfactory agreement with the experimental magnetic behavior, with g = 2.0 and J13 = J23 = −32.1 cm−1, J12 = J14 = −14.5 cm−1, J24 = J34 = −11.1 cm−1.
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