Cover Picture

The cover picture shows in the center an electron-density map of the molecular container compound cucurbit7]uril. The polarizability inside the cavity of this host can be explored through solvatochromic effects on the absorption spectra (bottom right) when probed by the inclusion of an azo chromophore guest (top left). This novel method allows insight into the inner phase of supermolecules. More details about this process is described by Marquiz and Nau on pp. 4387 ff.