Synthesis and reactions with CO and C2H4 of Cobalt(I) complexes containing trimethylphosphine and chelating o-Diphenylphosphanylphenolate ligands

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Inst. Anorganische Chem. Tech. U., PetersenStraße 18, D-64285 Darmstadt, Germany [1 ]
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Z. Naturforsch. Sect. B J. Chem. Sci. | / 3卷 / 307-314期
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Ground state - Isomers - Ligands - Cobalt compounds - Synthesis (chemical);
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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 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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