Reactions of stable [PtCl2(η2-olefin)(α-di-imine)] complexes. Retention of the five-co-ordinate structure upon halogen exchange and ligand substitution with olefins, α-di-imines, and N,N′-disubstituted 1,2-diaminoethanes
- 1 January 1981
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 11,p. 2164-2171
- https://doi.org/10.1039/dt9810002164
Abstract
The axial halogen atoms as well as the equatorial η2-C2H4 and σ,σ-N,N′ chelate-bonded R–NCH–CHN–R or R–N(H)CH2CH2N(H)–R ligands (L–L) in five-co-ordinate [PtCl2(η2-C2H4)(σ,σ-N,N′–L–L)] can be replaced with retention of the trigonal-bipyramidal structure. Halogen exchange is initiated by formation of an ionic intermediate [PtCl(η2-C2H4)(L–L)]Cl. The reversible exchange of the equatorial ligands with olefins, α-di-imines, or 1,2-diamine ligands is proposed to proceed via five-co-ordinate intermediates. The selectivity observed in these exchange reactions is explained on the basis of the difference in steric constraints of the various olefins and bidentate ligands used.Keywords
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