Magnesium phosphandiides

Since the Mg-P bond is probably as ionic as the Li-P bond, it is expected that the structural features of their aggregates are very similar. However, structurally characterized magnesium phosphanides are scarce (44-46). Only recently have the first magnesium phosphandiides been prepared and structurally characterized (47, 48). 

In contrast to magnesium phosphandiides, analogous tin(II) derivatives possess more covalent metal-phosphorus bonds. This basic difference is also apparent for dilithium versus dicopper(I) phosphandiides (see Section II and III). It is, therefore, interesting to assess the structural and electronic features of such species in a similar way. To date, only three tin(II) phosphandiide derivatives have been prepared... 

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