TY - JOUR
T1 - Fusion of ferric citrate and zirconium hexafluoride
T2 - Synthesis, structure and magnetic properties of [Fe6O2Zr2F6(cit)4(H2O)10]
AU - Avisar, Shay
AU - Bogoslavsky, Benny
AU - Bino, Avi
N1 - Publisher Copyright:
© 2018 Elsevier B.V.
PY - 2018/7/1
Y1 - 2018/7/1
N2 - The introduction of hexafluorozirconium(IV), [ZrF6]2−, to a solution containing Fe(III) and citrate ions produced a rather unexpected condensation product, namely, [Fe6O2Zr2F6(cit)4(H2O)10] (1). X-ray crystal structure study has revealed that complex 1 is centrosymmetric, consisting of two FeZrO2 units interconnected to a central planar Fe4O2 core through fluoride and citrate bridges. The Fe⋯Fe separation within the Fe4O2 unit of 2.8952(6) Å is similar to that found in other planar or bent Fe4O2 cores found in discrete complexes. Magnetic susceptibility as a function of temperature has revealed that the compound is paramagnetic with a Curie-Weiss behavior over the temperature range 5–150 K. The derived values are C = 24.7 emu K/mol Oe and a θ value of −6.6(1) K, consistent with six independent HS d5 centers. Mössbauer spectra of compound 1·24H2O at 92 and 295 K exhibits one apparent symmetric broad doublet suggesting that there are at least two very similar sites, which cannot otherwise be resolved.
AB - The introduction of hexafluorozirconium(IV), [ZrF6]2−, to a solution containing Fe(III) and citrate ions produced a rather unexpected condensation product, namely, [Fe6O2Zr2F6(cit)4(H2O)10] (1). X-ray crystal structure study has revealed that complex 1 is centrosymmetric, consisting of two FeZrO2 units interconnected to a central planar Fe4O2 core through fluoride and citrate bridges. The Fe⋯Fe separation within the Fe4O2 unit of 2.8952(6) Å is similar to that found in other planar or bent Fe4O2 cores found in discrete complexes. Magnetic susceptibility as a function of temperature has revealed that the compound is paramagnetic with a Curie-Weiss behavior over the temperature range 5–150 K. The derived values are C = 24.7 emu K/mol Oe and a θ value of −6.6(1) K, consistent with six independent HS d5 centers. Mössbauer spectra of compound 1·24H2O at 92 and 295 K exhibits one apparent symmetric broad doublet suggesting that there are at least two very similar sites, which cannot otherwise be resolved.
UR - http://www.scopus.com/inward/record.url?scp=85046370932&partnerID=8YFLogxK
U2 - 10.1016/j.ica.2018.04.012
DO - 10.1016/j.ica.2018.04.012
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AN - SCOPUS:85046370932
SN - 0020-1693
VL - 479
SP - 161
EP - 164
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
ER -