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ISOMERS OF TRIS(2-METHYL-1,3-PROPANEDIAMINE)COBALT(III)‐A COMPLEX OF A PROCHIRAL SINAMBIC LIGAND

1981; Taylor & Francis; Volume: 11; Issue: 1 Linguagem: Inglês

10.1080/00958978108080659

1029-0389

J D. Mather, Robert E. Tapscott,

Organometallic Complex Synthesis and Catalysis

Abstract The complex ion [Co(metn)3]3+ (metn=2-methyl-1,3-propanediamine) has been synthesized and the facial and meridional isomers have been separated by column chromatography and identified by 13C and 1H NMR spectroscopy. This is the first reported separation of isomers of a tris complex where the isomerism is due to the presence of prochiral ligands with enantiotopic donor atoms (prochiral “sinambic” ligands). The 13C and visible spectra indicate a large contribution from conformers containing skew-boat chelate rings in solution. An incomplete (owing to disorder) crystal structure shows a tris-(skew-boat) conformer for the cationic complex present in fac-[Co(metn)3] Cl3.