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Sodium trimetaphosphate , with formula Na3P3O9, is a metaphosphate of sodium. It has the empirical formula NaPO3. It is the sodium salt of trimetaphosphoric acid. It is a colourless solid that finds specialised applications in food and construction industries. STMP is prepared by heating samples sodium polyphosphate.
Although drawn with a particular resonance structure, the trianion has D3d symmetry. Hydrolysis of the ring leads to the acyclic sodium triphosphate:
The main reactions of the triphosphate anion is ring-opening by nucleophiles, including amines.
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