Angewandte Chemie International Edition

Cover Picture (Angew. Chem. Int. Ed. Engl. 4/1991)

The title picture shows a representation of the electron localization function (ELF) for the example molecule, Sn₂H₄. This new parameter can be used to give an excellent graphical description of bonds and electron pairs. The calculated electron density (drawn as a cloud) is color-coded according to its magnitude: the regions of highest electron localization are white and the lowest blue. The background and the cores of the Sn atoms are black. The plane displayed in the cover picture includes the tin atoms and bisects the H-Sn-H angle of Sn,H,. The H nuclei are situated above and below the plane. Further examples of the potential of this graphical ELF representation are discussed by A. Savin, A. D. Becke, E. Flad, R. Nesper, H. Preuss, and H. G. von Schnering on page 409.

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