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Organo Phosphonates

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  • Phosphonates are anthropogenic complexing agents containing one or more C–PO(OH)2 groups.

  • Phosphonates are molecules with a characteristic C–PO3H2 group.

  • They are used in numerous technical and industrial applications as chelating agents and scale inhibitors.

  • Phosphonates are similar to phosphates except that they have a carbon–phosphorous (C–P) bonding place of the carbon–oxygen phosphorous (C–O–P) linkage.

  • Phosphonates are quite common among different organisms, from prokaryotes to eubacteria and fungi, mollusks, insects and others but the biological role of the natural Phosphonates is still poorly understood.

  • Phosphonates are very stable and breakdown of uncomplexed Phosphonates requires long timescales and severe chemical conditions.

  • Growing an Organophosphonate film on SiO2/Si by self assembly is a straightforward process.

  • Ni(II) interacted with various mixed Organophosphonate ligands: a) imino bis(methylphosphonic acid), b) N-(phosphonomethyl) glycine, and c) N-(phosphonomethyl) iminodiacetic acid.

  • Metal Organophosphonates offer a new class of layered structures where the organic groups are covalently attached to the inorganic backbone and consist of a sequence of alternating inorganic and organic layers.

  • The most commonly used Phosphonates are structural analogues to the well-known aminopolycarboxylates such as ethylene diamine tetracetate (EDTA) and nitrilotriacetate (NTA).

  • Phosphonates are used The standard method for the determination of Phosphonates is ion-chromatography followed by post column reaction with Fe(III) and detection of the Fe(III)-complexes at 300–330nmas chelating agents in many applications, e.g. in pulp, paper and textile industry.

  • In detergent applications there are  four Phosphonates are used.  those are HEDP (1-hydroxyethylene 1,1-diphosphonic acid), ATMP (aminotrimethylene- phosphonic acid), EDTMP (ethylenediaminetetra(
    methylenephosphonic acid)) and DTPMP (diethylenetriamine-pentamethylenephosphonic acid).

  • Phosphonates have largely replaced inorganic phosphates in water treatment processes.
     

 

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