Abstract
The adsorption of trimethylphosphine on dehydrated and partially dehydrated CoX zeolites does not give trimethylphosphine coordination complexes. The reflectance spectra can be interpreted as due to complexes with three lattice oxygens and one extra lattice ligand coordinated to Co 2+ along the trigonal axis of the zeolite. On fully dehydrated CoX zeolites the strength of the extra lattice ligand is equal to the strength of the lattice oxygens with 10 D q = 4993 ± 52 cm −1. For partially dehydrated CoX the extra lattice ligand strength is 14–20% larger than the lattice oxygens ligand strength. The exact chemical identification of this extra lattice ligand was not possible. On CoY zeolites low spin square pyramidal [Co(PMe 3) 5] 2+ complexes are formed together with complexes which are probably of the form [Co(O l) 3PMe 3] 2+. The former can only be synthesized in excess PMe 3, the latter are thermally stable up to ∼390°K. In every case, these complexation reactions are hampered by chemisorption on the surface.
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