Synthesis and Reactions with CO and C2H4 of Cobalt(I) Complexes Containing Trimethylphosphine and Chelating o-Diphenylphosphanyl- phenolate Ligands
نویسندگان
چکیده
In tetracoordinate cobalt(I) halide compounds CoX(Ph2P OH)(PMe3)2 (X = Cl, Br) o-phosphanylphenols Ph2P OH are coordinated as phosphane ligands. In the presence of base chelating anions Ph2P O give rise to pentacoordinate complexes Co(Ph2 P O)(PMe3)3. Molecular structures are presented for both types of compounds. The five-membered chelate ring in Co(Ph2P O)(PMe3)3 is resistant to protonation, and ring-opening is not observed in the presence of CO or C2H4. Replacing one of the trimethylphosphanes by one of the -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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