Chiral metal complexes. 48. Stereoselectivity in ternary Co(III) complexes of N,N′-di (2S-pyrrolidin-2-yl)-1R, 2R-diaminocyclohexane

Michael A. Cox, Frederick S. Stephens, Robert S. Vagg, Peter A. Williams*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

The ternary complexes Δ-β1-, Δ-β2- and Δ-β2-[Co(S,R,R,S-pychxn)(S-ala)]2+ have been synthesised and characterised using electronic and CD spectroscopy and X-ray diffraction methods (S,R,R,S-pychxn = N,N′-di(2S-pyrrolidin-2-yl)-1R, 2R-diaminocyclohexane; S-alaH = S-alanine). A single-crystal X-ray structural study of the diperchlorate monohydrate salt of the Δ-β1 diastereoisomer has been undertaken. The complex is orthorhombic, space group P212121, with a = 9.607(3), b = 11.803(5) c = 23.936(7)Å, Z = 4. The structure was refined by full-matrix least-squares methods to R = 0.061 and Rw = 0.060 for 2648 reflections with I > 3σ(I). Both nitrogen atoms of the coordinated pyrrolidyl groups adopt S configurations but the two internal nitrogen donors have opposite configurations, with that at the fold of the tetradendate being R. It is apparent that S,R,R,S-pychxn is not stereospecific in its coordination to octahedral transition metal ions, as has been previously claimed.

Original languageEnglish
Pages (from-to)291-301
Number of pages11
JournalJournal of Coordination Chemistry
Volume41
Issue number4
DOIs
Publication statusPublished - 1997

Keywords

  • aminoacid
  • cobalt(III)
  • stereochemistry
  • tetradentate
  • x-ray structure

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