trans-bent double bond

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Planar double bond (e.g. between two carbon atoms) and trans-bent double bond (e.g. between two tin atoms) with an angle of inclination α.

The trans-bent double bonds are double bonds that are not "as usual" (z. B. carbon Chemie) are planar, but is inclined ( pyramidal structure between the element E and the radicals R).

In the 14th group of the periodic table , a trend from the planar double bond to the trans-bent double bond can be observed. During double-bonded carbon is coordinated only planar (almost), are at the silicon both planar, as well as trans-bent structures known (yielding can conclude that in the case of the silicon bonds are both energetically similar). In the case of germanium and tin , only trans-bent structures have so far been theoretically predicted and discovered. The bond angle α usually increases from germanium to tin.

Individual evidence

  1. ^ Jean Paul Malrieu, Georges Trinquier: Trans-bending at double bonds. Occurrence and extent . In: Journal of the American Chemical Society . 111, No. 15, 1989, pp. 5916-5921. doi : 10.1021 / ja00197a061 .
  2. ^ R. Alsfasser, Christoph Janiak, Thomas M. Klapötke, Hans-Jürgen Meyer: Moderne Anorganische Chemie . Ed .: Erwin Riedel. 3. Edition. de Gruyter, 2007, ISBN 978-3-11-019060-1 , p. 133-135 .