On the structure of tetracoordinated organocobalt complexes of the type [CoR2L2]

Guillermo Muller, Joaquim Sales, Jordi Vinaixa

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A series of square-planar organocobalt complexes of the type [CoR2L2] (R = 2,3,4,6-C6,HCl4 and 2,3,6-C6H2Cl3, L = PEtPh2, PEt2Ph, and PEt3; R = 2,3,5,6-C6HCl4, and 2,6-C6H3Cl2, L = PEt2Ph, PEt3, and 1 2dpe) have been prepared in which the electronegativities of the ligand R vary progressively. The reaction of o-C6H4ClMgBr with [CoCl2L2] (L = PEtPh2 PEt2Ph, γ-pic or 1 2bipy) did not give air stable compounds at room temperature, but the solutions obtained at -78°C appear to contain square-planar species for L = PEtPh2, PEt2Ph, and γ-pic, and tetrahedral for L2 = bipy. The tendency towards square-planar or tetrahedral structures for the compounds [CoR2L2] depends on the following factors in order of importance: (i) when the neutral ligand is a phosphine a square-planar structure is adopted; (ii) when L is an aromatic amine, bulky ortho substituents on R favour a square-planar structure; and (iii) a tetrahedral geometry is favoured by bidentate amine ligands. The electronegativity of the organic group R seems to be less important.

Idioma originalAnglès
Pàgines (de-a)255-261
Nombre de pàgines7
RevistaJournal of Organometallic Chemistry
Estat de la publicacióPublicada - 25 de set. 1984
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