from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A univalent radical, PH4, derived from phosphine.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. the tetravalent positively-charged phosphorus cation R4P+

from the GNU version of the Collaborative International Dictionary of English

  • n. The hypothetical radical PH4, analogous to ammonium, and regarded as the nucleus of certain derivatives of phosphine.

from The Century Dictionary and Cyclopedia

  • n. A hypothetical compound, analogous to ammonium, formed by the union of four atoms of hydrogen and one of phosphorus (PH4).


from The American Heritage® Dictionary of the English Language, 4th Edition

phosph(o)- + (amm)onium.


  • When cotton sleepwear has been treated with flame retardants, this typically is done with tetrakis hydroxymethyl phosphonium THP salts, which are said to be both effective and safe from a general health stand-point.


  • The phosphonium salts are of but little importance.

    An Elementary Study of Chemistry

  • Thus we have phosphonium chloride (PH_ {4} Cl) analogous to ammonium chloride

    An Elementary Study of Chemistry

  • If a small quantity of water is used, a larger deposit of yellow phosphorus is formed, together with a considerable quantity of phosphonium iodide.

    Scientific American Supplement, No. 841, February 13, 1892

  • In one of their recent studies, to be presented this coming week at the AIChE annual meeting, the team synthesized and prepared a quaternary-phosphonium functionalized hydroxide exchange membrane (TPQPOH152) with typical thickness of 50-100 µm.

    Green Car Congress

  • Yan and his group switched from the QAOH to the quaternary-phosphonium-hydroxide (QPOH), opening up the potential to solve the low hydroxide-conductivity problem and thus improve the HEMFC performance drastically.

    Green Car Congress

  • The researchers suggest that the high hydroxide-conductivity and high-performance of HEMFC indicate that the quaternary-phosphonium functionalized TPQPOH152

    Green Car Congress


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