phosphonium ion

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The ion PH4+, or the corresponding organic derivatives of the type R3PH+, RPH3+. The phosphonium ion PH4+ is formally analogous to the ammonium ion NH4+ but PH3 has a much lower proton affinity than NH3 and reaction of PH3 with acids is necessary for the production of phosphonium salts.

Subjects: Chemistry.

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