Mössbauer Effect in Iron Pentacarbonyl and Related Carbonyls

Journal Article · Fri Feb 01 04:00:00 EST 1963 · Inorganic Chemistry

DOI:https://doi.org/10.1021/ic50005a040· OSTI ID:4734442

Herber, R. H.; Kingston, W. R.; Wertheim, G. K.

Four related iron carbonyls, Fe(CO)/sub 5/, Fe/sub 2/(CO)/sub 9/, Fe/sub 3/(CO)/sub 12/, and Fe(CO)/sub 4/I/sub 2/, were used as stationary absorb ers in a Mossbauer experiment in which Co/sup 57/, diffused into metallic chromium, was employed as a source. All four absorbers showed significant resonance absorption of the 14.4-kev gamma -ray of Fe/sup 57/ at 78 deg K. The observed isomer shifts were interpreted in terms of the chemical bonding in transition metal-carbonyl compounds. The two major Mossbauer parameters (isomer shift and quadrupole splitting) in the case of Fe(CO)/sub 5/ and Fe/sub 2/(CO)/sub 9/ were in agreement with a trigonal bipyramid structure and a (3,3,3) structure, respectively. The data for Fe/sub 3/(CO)/sub 12/ strongly suggested the linear (3,3,3,3) structure and could not be accounted for by the trigonal arrangement of the three iron atoms, which was proposed on the basis of x-ray data. The quidrupole splitting for Fe(CO)/sub 4/I/sub 2/ was essentially independent of temperature in the range 78 to 298 deg K, in contrast to the large temperature dependences, which were observed for some related Fe(II) compounds. The isomer shift was consistent with an assignment of 2+ for the oxidation state of iron in this compound.

• Research Organization: Rutgers Univ., New Brunswick, N.J.; and Bell Telephone Labs., Murray Hill, N.J.
• Sponsoring Organization: USDOE
• NSA Number: NSA-17-014260
• OSTI ID: 4734442
• Journal Information: Inorganic Chemistry, Journal Name: Inorganic Chemistry Journal Issue: 1 Vol. 2; ISSN 0020-1669
• Publisher: American Chemical Society (ACS)
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BINDING ENERGY
CARBONYLS
CHEMISTRY
CHROMIUM
COBALT 57
DIFFUSION
GAMMA RADIATION
IRON 57
IRON COMPOUNDS
IRON IODIDES
ISOMERS
LATTICES
MAGNETIC MOMENTS
MOESSBAUER EFFECT
NUCLEAR MAGNETIC RESONANCE
QUADRUPOLES
RADIATION SOURCES
SPECTRAL SHIFT
TEMPERATURE
TRANSITION METALS