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Thiophosphoryl Nitride, SPN

Thiophosphoryl Nitride or Nitrilomonothiophosphoric Acid, SPN, was obtained by gradually heating together, from 180° to 328° C., P2S5 and NH4Cl in the quantities required by the equation

P2S5 + 2NH4Cl = 2SPN + 2HCl + 3H2S

It resulted also on heating amido- and imido-thiophosphates in a vacuum. It was a white powder, fairly stable to aqueous reagents, but hydrolysed by water at 140° C., thus

SPN + 4H2O = H3PO4 + H2S + NH3

On strong heating it gave P3N5 (q.v.).

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