Abstract
The organically templated (C 4H 12N 2)[Fe IIFe III(HPO 3) 2F 3] compound has been synthesized under mild solvothermal conditions. The crystal structure has been determined from X-ray single-crystal diffraction data. The compound crystallizes in the P2 1/ n monoclinic space group, with the unit-cell parameters a = 12.935(1), b = 6.4476(7), c = 15.693(2) Å, β = 105.630(9)° and Z = 4. The crystal structure consists of [Fe IIFe III(HPO 3) 2F 3] 2− chains formed by a central chain built of [Fe(2)O 4F 2] edge-sharing octahedra, and two side chains formed by alternating [Fe(1)O 3F 3] octahedra and [HP(1)O 3] tetrahedra. The piperazinium cations are placed between the chains linked by ionic and hydrogen interactions. The IR and Raman spectra show the existence of two phosphite crystallographically independent. From the diffuse reflectance spectrum the D q parameter for the iron(II) cations has been calculated ( D q = 820 cm −1). The Mössbauer spectrum in the paramagnetic state shows the simultaneous presence of Fe 2+ and Fe 3+. The magnetic measurements indicate the existence of antiferromagnetic interactions.
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