Extended x-ray absorption fine structure studies of the hydrolytic polymerization of iron(III). I. Structural characterization of the. mu. -dihydroxo-octaaquodiiron(III) dimer

Journal Article · Wed May 10 00:00:00 EDT 1978 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja00478a074· OSTI ID:6673629

Morrison, T I ^[1]; Reis, Jr, A H; Knapp, G S; Fradin, F Y; Chen, H; Klippert, T E

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1. Argonne National Lab., IL

Aqueous solutions of Fe(III) hydrolyze over a range of pH forming dimer and polymer complexes. The existence of the dihydroxo-bridged Fe(III) dimer ..mu..-dihydroxo-octaaquodiiron ((H/sub 2/O)/sub 4/Fe(OH)/sub 2/Fe(OH/sub 2/)/sub 4/)/sup 4 +/ (I) in low pH solutions has been postulated to be the predominant species. Structural data, based on the extended x-ray absorption fine structure, demonstrates the existence of the postulated dimer I. The structure is proposed in which each Fe(III) is octahedrally coordinated to two OH/sup -/ ligands and to four H/sub 2/O molecules. Bond angles were evaluated for the postulated planar ring. (JSR)

• OSTI ID: 6673629
• Journal Information: J. Am. Chem. Soc.; (United States), Vol. 100:10
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
IRON
HYDROLYSIS
IRON COMPLEXES
STRUCTURAL CHEMICAL ANALYSIS
AQUEOUS SOLUTIONS
DIMERIZATION
DIMERS
PH VALUE
X RADIATION
CHEMICAL REACTIONS
COMPLEXES
DECOMPOSITION
DISPERSIONS
ELECTROMAGNETIC RADIATION
ELEMENTS
IONIZING RADIATIONS
LYSIS
METALS
MIXTURES
POLYMERIZATION
RADIATIONS
SOLUTIONS
SOLVOLYSIS
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENTS
400201* - Chemical & Physicochemical Properties