The chemistry of iron has an active area of research, particularly in the fields of catalysis and biochemistry. This review includes eighty-five double salts of iron and over eight hundred and fifty heterobinuclear iron compounds of known crystal structure. The heterometal atoms include non -transition and transition metals, as well as lanthanides and actinides. Correlations between structural parameters, heterometal and ligand donor atoms are developed and an overall summary of the metal -metal distances is given.
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The title compound, (NH 4 ) 2 [FeCl 5 H 2 O] has been prepared by reaction between iron(III) chloride and ammonium chloride which was formed by hydrolysis of isonicotinamide or thionicotinamide in ethanol. The characterization was based on elemental analysis and infrared spectra. The crystal structure of the title compound has been refi ned by single crystal X-ray diffraction method at 293 K. Crystals are orthorhombic, Pnma, with unit cell parameters: a = 13.760(1) Å, b = 9.960(1) Å, c = 7.060(1) Å, Z = 4 and R = 3.5 %. The iron(III) atom in [FeCl 5 2-ion is approximately octahedrally coordinated by fi ve Cl atoms and one O atom of H 2 O molecule. This distortion is caused by the extensively hydrogen-bonded lattice. Structural parameters and IR spectra of similar compounds are compared and discussed.
Triphenylphosphine oxide, OP(C6H5)3, can be conveniently prepared by oxidation of triphenylphosphine, P(C6H5)3, by oxygen under the catalytic effect of iron compounds such as FeX3 FeX3[OP(C6H5)3]2, (X = Cl, Br, NCS), or FeCl3[P(C6H5)32]. The highest catalytic effect was observed in the case of the complexes containing the bromo or thiocyanato ligands. The oxidation in acetonitrile solution is quantitative and selective at 30 - 70 °C and atmospheric pressure of oxygen gas.
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