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Examination of the conformational restraints to a chiral diimine bridged 2,2′-bipyridine

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<mark>Journal publication date</mark>23/08/2004
<mark>Journal</mark>Tetrahedron Asymmetry
Issue number16
Volume15
Number of pages6
Pages (from-to)2527-2532
Publication StatusPublished
<mark>Original language</mark>English

Abstract

The synthesis of a new bis(2,2′-bipyridine), bridged by a Schiff base cyclohexane moiety is described. Surprisingly, this compound does not appear to form discrete oligonuclear metal complexes on the addition of zinc(II) and iron(II) cations. In order to rationalise this behaviour, the compound's conformation has been explored using a combination of circular dichroism, X-ray crystallography and DFT calculations, indicating that at least two energy barriers need to be overcome to orientate the ligand in a suitable conformation to permit the formation of coordination helicates with control over the metal centred stereochemistry.