Crystal structure and mass spectrum of µ₃-oxo-hexakis(µ-trimethyl-acetato)-trismethanoltri-iron(III) chloride, a trinuclear basic iron(III) carboxylate

Abstract

The crystal structure of the title compound has been determined by single-crystal X-ray diffraction photography, and refined isotropically by the method of least squares to R 0.1 16, based on 552 independent reflections. There are two molecules in a hexagonal unit cell, space group P63, with a = 10-43(3) and c = 22.79(5) 8. The structure consists of cations [Fe,0(pi~)~(MeOH),]+ (piv = CMe,*CO,) lying on the three-fold axes, with chloride ions on the screw axes. The cation is analogous to that in the chromium(iii) and iron(iii) basic acetates, except for the rigorous three-fold symmetry and the fact that the central oxygen atom is displaced 0.24 8 from the Fe, plane. The mass spectrum i s unusual in showing peaks due to ions containing more than three iron atoms, e.g. Fe,O(piv),+ which appears in greater abundance than any trinuclear ion.

Synthesis, structures, and magnetic properties of binuclear carboxylate complexes with NiII and NiIII atoms

“…from the three first sequentially located pairs (0.735 A for the Ni(3)Ni(4)Ni (5) and Ni(3a)Ni(4a)Ni(5a) planes). In contrast, the tfidentate O atom in the known trinuclear ~t3-oxo complexes of transition metals is located in the M 3 plane (for R = CMe 3, see, for example, Refs.…”

An Octanuclear FeIII Compound Featuring a New Type of Double Butterfly Iron–Oxo Core

“…The distance from an iron center to the O alkoxo atom (Fe1 À O3 2.082 ) is longer than to a bridging O alkoxo atom (Fe3ÀO4 and Fe4ÀO4 av 1.991 ), and comparable to that for MeOH bound to Fe III in a basic carboxylate. [11] It is therefore concluded that an alcohol molecule is coordinated to Fe1 and hydrogen bonded to a monodentate carboxylate.…”

First triangular carboxylate cluster with the Fe(II)Fe(II)Fe(II) metal core

“…1). In contrary to the known [Fe 3 O(OOCR) 6 L 3 ] þ species with the Fe(III) atoms [3][4][5][6], the Fe 3 O fragment in complex I is non-planar (the O atom protrudes from the Fe 3 plane at 0.226 A). The potassium cation interacts with the triangle iron anion via the KÁ Á ÁO(OOCR) contacts (2.748(4)-3.059(4) A).…”