Lanthanoid-olefin complex formation: a matrix-isolation ultraviolet-visible and infrared study of the direct synthesis of (C/sub 2/H/sub 4/)/sub n/Eu using europium atoms

Journal Article · Tue Mar 01 04:00:00 EST 1988 · Organometallics; (United States)

DOI:https://doi.org/10.1021/om00093a028· OSTI ID:5129558

Andrews, M P; Wayda, A L

Eu(C/sub 2/H/sub 4/)/sub n/ complexes have been synthesized at 12 K by codepositing Eu atoms with ethylene, neat or doped in Ar or Xe. UV-visible absorption spectroscopy of the highest stoichiometry product revealed a broad, intense visible transition centered at 537 nm. The complex is unstable above 50 K, consistent with the absence of any evidence for reaction in 77 K metal vapor reactions. Optical spectroscopy of the products formed in dilute matrices indicated the formation of a lower stoichiometry Eu-C/sub 2/H/sub 4/ complex. This was confirmed by infrared studies of absorption in the coupled ..gamma..(C=C)delta(CH/sub 2/) region. Under high dilution conditions, a matrix split 11981182 cm/sup -1/ doublet is assigned to a monoethylene europium ..pi.. complex. Matrix-annealing experiments combined with EuC/sub 2/H/sub 4/ reactions in C/sub 2/H/sub 4/rare-gas matrices of increasing C/sub 2/H/sub 4/ concentration trace the conversion of Eu(C/sub 2/H/sub 4/) to the highest stoichiometry species absorbing at 1233 cm/sup -1/. In general, the Eu(C/sub 2/H/sub 4/)/sub n/ IR spectra are similar to those of matrix-isolated group VIII (8-10) and IB (11) ethylene ..pi.. complexes.

• Research Organization: AT and T Bell Labs., Murray Hill, NJ (USA)
• OSTI ID: 5129558
• Journal Information: Organometallics; (United States), Journal Name: Organometallics; (United States) Vol. 7:3; ISSN ORGND
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTROSCOPY
ALKENES
CHEMICAL PREPARATION
COMPLEXES
DATA
EUROPIUM COMPLEXES
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
INFRARED SPECTRA
MATRIX ISOLATION
NUMERICAL DATA
ORGANIC COMPOUNDS
RARE EARTH COMPLEXES
SPECTRA
SPECTROSCOPY
STOICHIOMETRY
SYNTHESIS
ULTRAVIOLET SPECTRA
VISIBLE SPECTRA