Iron/alkene reactions: a matrix isolation infrared and Moessbauer investigation

Journal Article · Wed Sep 28 00:00:00 EDT 1983 · Inorg. Chem.; (United States)

DOI:https://doi.org/10.1021/ic00162a010· OSTI ID:5581129

Parker, S F; Peden, C H.F.; Barrett, P H; Pearson, R G

The reactions of matrix-isolated iron atoms and clusters with the alkenes ethylene and propylene have been investigated by infrared and Moessbauer spectroscopies. In ethylene at low temperatures (<18 K) and with low iron concentrations (<1%) the major product is iron/ethylene comples (Fe(C/sub 2/H/sub 4/)). This is the only monoiron product formed, although unreacted iron atoms can be observed in pure ethylene at 4.2 K. Irradiation with the unfiltered output of a high-pressure Xe lamp causes the unreacted iron atoms to react to Fe(C/sub 2/H/sub 4/). At higher temperatures and iron concentrations additional products Fe/sub 2/(C/sub 2/H/sub 4/)/sub x/ (x = 1, 2) and Fe/sub p/(C/sub 2/H/sub 4/)/sub p/ (p > 2) are formed. Moessbauer spectra of iron/propylene complex (Fe/C/sub 3/H/sub 6/) at both 4.2 and 20 K are very similar to those of Fe/C/sub 2/H/sub 4/. Hence the products are similarly assigned to Fe(C/sub 3/H/sub 6/), Fe/sub 2/(C/sub 3/H/sub 6/)/sub 2/, and Fe/sub p/(C/sub 3/H/sub 6/)/sub p/ (p > 2). The Moessbauer spectra of the products indicate that the electronic configuration of the iron atoms in the alkene complexes is approximately (4s)/sup 1/(3d)/sup 7/, in agreement with theoretical work. The Moessbauer spectra of Fe(C/sub 2/H/sub 4/) and Fe(C/sub 3/H/sub 6/) are also consistent with the proposal that C/sub 2/H/sub 4/ and C/sub 3/H/sub 6/ are primarily sigma donors with only minimal d/sub ..pi../..--> pi..* back-bonding. 8 figures, 2 tables.

• Research Organization: Univ. of California, Santa Barbara
• DOE Contract Number: AM03-76SF00034
• OSTI ID: 5581129
• Journal Information: Inorg. Chem.; (United States), Vol. 22:20
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ETHYLENE
CHEMICAL REACTIONS
IRON
IRON COMPLEXES
CHEMICAL REACTION YIELD
PROPYLENE
ARGON
ATOMS
COVER GAS
DEPOSITION
EVAPORATION
EXCITATION
EXPERIMENTAL DATA
HELIUM
INFRARED SPECTRA
IRON 57
ISOTOPE EFFECTS
ISOTOPE ENRICHED MATERIALS
LOW TEMPERATURE
MATRIX ISOLATION
MATRIX MATERIALS
MOESSBAUER EFFECT
ORGANOMETALLIC COMPOUNDS
POWDERS
SODIUM CHLORIDES
STOICHIOMETRY
STRUCTURAL CHEMICAL ANALYSIS
TEMPERATURE DEPENDENCE
ULTRALOW TEMPERATURE
VERY HIGH TEMPERATURE
ALKALI METAL COMPOUNDS
ALKENES
CHLORIDES
CHLORINE COMPOUNDS
COMPLEXES
DATA
ELEMENTS
ENERGY-LEVEL TRANSITIONS
EVEN-ODD NUCLEI
FLUIDS
GASES
HALIDES
HALOGEN COMPOUNDS
HYDROCARBONS
INERT ATMOSPHERE
INFORMATION
INTERMEDIATE MASS NUCLEI
IRON ISOTOPES
ISOTOPES
MATERIALS
METALS
NONMETALS
NUCLEI
NUMERICAL DATA
ORGANIC COMPOUNDS
PHASE TRANSFORMATIONS
RARE GASES
SODIUM COMPOUNDS
SPECTRA
STABLE ISOTOPES
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENTS
YIELDS
400201* - Chemical &amp; Physicochemical Properties
400301 - Organic Chemistry- Chemical &amp; Physicochemical Properties- (-1987)
400500 - Photochemistry