The cover shows the coat of arms of the city of Mainz and two ends of the formula of a new “trimesogen.” Heraldry as source of chemical inspiration? The “Wheel of Mainz” as liquid crystal? A ludicrous, by no means scientific question? Certainly not! The study of the structure-property relationships of new compounds and their directed synthesis (molecular engineering, molecular design) is one of the fascinating problems of modern organic chemistry. The wheel of Mainz has, at first glance, nothing to do with liquid crystal research. However, if one is concerned with the molecular combination of disk- and rod-shaped mesogens one cannot avoid this historical geometry. The translation of the structure of the “Wheel of Mainz” into a molecular structure is reported on by H. Ringsdorf et al. on page 1249.
The cover illustration prompts the editor to take this opportunity of inviting readers and authors to the forthcoming University Lecturers' Conference (March 13–16, 1988) in Mainz, when Angewandte Chemie will celebrate its centenary.