Abstract
The cover picture shows the influence of pressure on the 1H NMR signals (right) of the protons of the p-xylyl bridge in the Ag+ complex of the CHIRAGEN ligand depicted in light blue color. The doubling of the signal is due to the presence of two circular helicates, a hexamer (top left) and a tetramer (top right), both with predetermined absolute configurations. Increasing pressure shifts the equilibrium from the hexamer to the tetramer. The reaction volume has a remarkably large negative value. The study of this equilibrium system is described in more detail by A. von Zelewsky and A. Merbach et al. on p. 533 ff.
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