An application of the Difference-Patterson method

Abstract

The Difference-Patterson (D-P) technique is applied to a complicated example, namely, the isomorphous crystals, di-p-tolyl telluride and di-p-tolyl selenide, whose structures have been recently reported. It is shown that the D-P method can be confidently applied in general to isomorphous crystals, even though the replaceable atoms may slightly differ in their positions. Also, Buerger's vector set method is applied to the Patterson projections of the di-p-tolyl selenide alongb-andc-axes. It is shown that Buerger's method can be profitably used when there is no appreciable overlap in the projection and if the heavy atoms or the replaceable atoms do not have special values for their parameters.