Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5273840 | Tetrahedron Letters | 2012 | 6 Pages |
This Letter describes the synthesis of a C3-symmetrical tris-ACE-(6,6â²-bipyridyl)-α-CyD via 'one-pot' Staudinger-Aza-Wittig reaction (SAW). Metal complexation behavior was investigated by UV-vis and Circular Dichroism. Coordination of 6,6â²-bipyridyl units with CuII and NiII cations, spontaneously generates a strong exciton coupling-type positive Cotton effect proving the formation of a Î-helix with a left-handed screw propeller (M).
Graphical abstractA heterotritopic α-cyclodextrin tripod has been synthesized by the Staudinger-Aza-Wittig (SAW) reaction. Complexation properties and conformational events upon coordination with 'hard' to 'borderline' transition metals have been analyzed. Spontaneous formation of selective Î-helicity has been observed via the coordination with CuII and NiII cations.Download full-size image