Abstract
AbstractThe cover picture shows the structural changes in tertiary carboxamide groups induced by coordination of the electrically neutral nitrogen atom to a metal ion. Changing the hybridization from sp2 to sp3 results in pyramidalization at the nitrogen atom. This is expressed by the parameter χN which ranges from 0° (sp2) to 60° (sp3). Werner complexes with relatively weak M–Namide bonds are known with χN values between 30° and 47°. Full sp3 hybridization with complete lifting of the resonance and a value of 58° for χN is achieved in a complex in which the copper(II) ion is in the centre of the tetraazamacrocyclic amide ligand tert‐butoxycarbonyl‐alanyl‐cyclam. Details of its synthesis and structure are discussed in the article by R. Alsfasser et al. on p. 2357 ff.
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