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phosphide
In chemistry, a phosphide is a compound containing the P3- ion or its equivalent. Many different phosphides are known, with widely differing structures. Most commonly encountered on the binary phosphides, i.e. those materials consisting only of phosphorus and a less electronegative element. Numerous are polyphosphides, which are solids consisting of anionic chains or clusters of phosphorus. Phosphides are known with the majority of less electronegative elements with the exception of Hg, Pb, Sb, Bi, Te, and Po.〔Von Schnering, H.G. and Hönle , W. (1994) "Phosphides - Solid-state Chemistry" in ''Encyclopedia of Inorganic Chemistry''. R. Bruce King (ed.). John Wiley & Sons ISBN 0-471-93620-0〕 Finally, some phosphides are molecular.
==Binary mono-phosphides==
Examples are the group 1 include . Notable examples include aluminium phosphide (AlP) and calcium phosphide (Ca3P2), which used as pesticides, exploiting their tendency to release toxic phosphine upon hydrolysis. Magnesium phosphide (Mg3P2) also is moisture sensitive. Indium phosphide (InP) and GaP are used as a semi-conductors, often in combination of related arsenides. Copper phosphide (Cu3P) illustrates a rare stoichiometry for a phosphide. These species are insoluble in all solvents - they are 3-dimensional solid state polymers. For those with electropositive metals, the materials hydrolyze:
:Ca3P2 + 6 H2O → 3 Ca(OH)2 + 2 PH3
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