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Phosphonium salt
A phosphonium salt is a salt containing the phosphonium (PH4+) ion such as phosphonium iodide (PH4+I-). More commonly, phosphonium refers to a quaternary organic derivative such as tetraphenylphosphonium chloride, (C6H5)4P+ Cl- and tetramethylphosphonium iodide, [P(CH3)4]+I-.

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