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In tetracoordinate cobalt(I) halide compounds CoX(Ph 2 P⌒O H)(PMe 3 ) 2  (X = CI, Br) o-phos-phanylphenols PhaP⌒OH are coordinated as phosphane ligands. In the presence of base chelat­ ing anions Ph 2 P⌒O -  give rise to pentacoordinate com plexes Co(Ph 2 P⌒O)(PMe 3 ) 3 . Molecular structures are presented for both types of compounds. The five-membered chelate ring in Co(Ph 2 P⌒O)(PMe 3 ) 3  is resistant to protonation, and ring-opening is not observed in the presence of CO or C 2 H 4 . Replacing one of the trimethylphosphanes by one of the π-acceptor ligands affords fluxional complex molecules which upon cooling attain definite ground-state geometries out of a multitude of possible isomers.

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Synthesis and Reactions with CO and C 2 H 4  of Cobalt(I) Complexes Containing Trimethylphosphine and Chelating o-Diphenylphosphanyl- phenolate Ligands