Synthesis, Structure and Solid-Phase Transformations of Fe Nitrosyl Complex Na₂[Fe₂(S₂O₃)₂(NO)₄] · 4H₂O

Author： Sanina N. Aldoshin S. Rudneva T. Golovina N. Shilov G. Shul’ga Yu. Martynenko V. Ovanesyan N.

ISSN： 1070-3284

Source： Russian Journal of Coordination Chemistry, Vol.31, Iss.5, 2005-05, pp. : 301-306

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Abstract

Binuclear iron nitrosyl complex Na₂[Fe₂(S₂O₃)₂(NO)₄] · 4H₂O (I) was synthesized by the reaction of iron(II) sulfate with sodium thiosulfate in the flow of NO gas. According to X-ray diffraction data, the [Fe₂(S₂O₃)₂(NO)₄]²⁻ anion has binuclear centrosymmetric structure with Fe atoms bonded by the µ-S atoms of thiosulfate groups. The isomeric shift for complex I δ=0.168(1) mm/s and quadrupole splitting ∆E _Q=1.288 mm/s at T=80 K. When heated, complex I transforms to Na₂[Fe₂(S₂O₃)₂(NO)₄] (II), whose unit cell parameters found by X-ray diffraction method differ from those of complex I. The process of transformation of I to II was studied by calorimetric method. Complex I transforms to complex II without chemical decomposition, which was confirmed by IR and mass spectroscopy data.