|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|5273840||1385499||2012||6 صفحه PDF||سفارش دهید||دانلود رایگان|
This Letter describes the synthesis of a C3-symmetrical tris-ACE-(6,6â²-bipyridyl)-Î±-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).
A heterotritopic Î±-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.
Journal: Tetrahedron Letters - Volume 53, Issue 16, 18 April 2012, Pages 2082-2087