Chiral metal complexes 43. Cobalt (III) complexes of novel asymmetric tetradentate and pentadentate aminopolypicolyl ligands

R. D. Gillard, P. D. Newman, R. S. Vagg*, P. A. Williams

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

The syntheses of the two novel chiral amines, N,N′-di(2-picolyl)-1R, 3S-diamino-1,2,2,-trimethylcyclopentane) (R,S-pictmcp) and 3S-di-(2-picolyl)-amino-N-(2-picolyl)hexahydroazepine (S-ahazterpy), and their complexes with Co(III) are reported. Coordination of the tetradentate R,S-pictmcp is shown to be highly stereoselective, with only the Δ-ß isomer of [Co(R,S-pictmcp)CO3]ClO4·2H2O being isolated. Assignment of stereochemistry was made using a combination of CD and NMR techniques. In the preparation of [Co(S-ahazterpy)ClO4)2·2H2O, containing the pentadentate polyamine, a single isomer (trans-equatorial was obtained. The yield, however, was low, and no inference is made to the extent of any stereoselectivity in this case. CD and NMR data are presented for both species and discssed in relation to assigned stereochemistries.

Original languageEnglish
Pages (from-to)79-84
Number of pages6
JournalInorganica Chimica Acta
Volume233
Issue number1-2
DOIs
Publication statusPublished - 1995

Keywords

  • Chiral complexes
  • Cobalt complexes
  • Polydentate aminopolypicolyl ligand complexes

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