Phosphide

Phosphide is an ion. Its chemical formula is sometimes P^3-, but it does not always have that formula. It is a reducing agent. Phosphides (chemical compounds having the phosphide ion in them) react with acids to make phosphine gas. Sodium phosphide is an example. Some phosphides are semiconductors and are not ionic with P^3- ions. They are less reactive. Some metals form alloys with phosphorus to make phosphides. If it is ionic, then the phosphorus is in the -3 oxidation state.

Phosphide Media

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  A portion of the structure of Cu
  3P, highlighting the highly crosslinked nature common to many transition metal phosphides (Cu = orange, P = purple).

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  Coordination environment around Cu in Cu
  3P. Two pairs of Cu atoms are eclipsed.

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  Structure of terminal phosphido complexes of Mo.