Magnesium Peroxyphosphate

Description

Magnesium peroxyphosphate has remained unknown and little to no publications concerning this salt are available on the scientific literature. Like the other alkaline earths, magnesium peroxyphosphates could be prepared by both solid-state or solution methods. The two sets of compounds would likely differ. For the monoperoxyphosphates, one would get MgHPO5 for the former method and perhaps a hydrate for an aqueous solution. The question of degree of hydration remains unknown.
In the solution method, one could use the acid, H3PO5 or the potassium salt K2HPO5. Whether the solution should be acidic or basic is not known. Like the other alkaline earths, it is probably best to prepare the acid in a nonaqueous solution like carbon tetrachloride and then add the potassiumcompound for the basic solution:
P2O5 + 2H2O2 +H2O ? 2H3PO5
2H3PO5 + KOH ? K2HPO5
To either of these is added the magnesium compound to form the monoperoxyphosphate:
Mg(OH)2 + K2PO5 ? MgHPO5 +H2O
For the diperoxy compounds, the potassium monoperoxyphosphate compound is transformed to the diperoxyphosphate compound, in a nonaqueous solution at low temperature:
K2HPO5 + P2O5 ? K2P2O8
For magnesium, the probable compounds that will be formed are:
MgHPO5 or Mg2P2O8
Other possible compounds are:
Mg(H2PO5)2 Mg(H2P2O8)2