C. Xu et al., INFRARED-SPECTRA OF ALUMINUM CARBONYL-COMPLEXES IN SOLID ARGON, Journal of the Chemical Society. Faraday transactions, 89(9), 1993, pp. 1291-1298
Citations number
16
Categorie Soggetti
Chemistry Physical","Physics, Atomic, Molecular & Chemical
Infrared spectra of aluminium carbonyl complexes generated in argon ma
trices by co-condensation of aluminium atoms and carbon monoxide have
been observed and analysed. AlCO, aluminium monocarbonyl, was isolated
and clearly identified. It is characterized by a carbonyl force const
ant (F(CO) almost-equal-to 14 mdyn angstrom-1) markedly smaller than i
n Al(CO)2 (15.5 mdyn angstrom-1), thus contradicting earlier studies c
oncluding that an AlCO complex should be unbound or, at most, a weak v
an der Waals complex. The new features in the low-frequency region for
the previously characterized AI(CO)2 species are analysed based on a
harmonic force field. The experimental results are consistent with the
prediction of an aluminium dicarbonyl structure of C2v symmetry with
bent Al-C=O groups. The existence of isocarbonyl structures could not
be confirmed, but the bimetallic species Al2CO and Al2(CO)4 were ident
ified.