STEREOCHEMISTRY AND SEVEN COORDINATION

A method is described to calculate the equilibrium configuration of any number of identical particles restricted to a spherical surface and interacting with forces derivable from an inter-particle potential of the form r−n. It is shown that distributions of symmetry C2 are expected for seven particles when n is small. In certain cases, the model can be used to explain the shape of molecules of the type MXm. The importance of directed valence in these molecules is considered and the structure of IF7 discussed.