In chemistry, pyrophosphates are phosphorus oxyanions that contain two phosphorus atoms in a P-O-P linkage. A number of pyrophosphate salts exist, such as disodium pyrophosphate (Na2H2P2O7) and tetrasodium pyrophosphate (Na4P2O7), among others. Often pyrophosphates are called diphosphates. The parent pyrophosphates are derived from partial or complete neutralization of pyrophosphoric acid. The pyrophosphate bond is also sometimes referred to as a phosphoanhydride bond, a naming convention which emphasizes the loss of water that occurs when two phosphates form a new P-O-P bond, and which mirrors the nomenclature for anhydrides of carboxylic acids. Pyrophosphates are found in ATP and other nucleotide triphosphates, which are very important in biochemistry.
Pyrophosphates are prepared by heating phosphates, hence the name pyro-phosphate (from the Ancient Greek: πῦρ, πυρός, romanized: pyr, pyros, lit. 'fire'[1]). More precisely, they are generated by heating phosphoric acids to the extent that a condensation reaction occurs.
Pyrophosphates are generally white or colorless. The alkali metal salts are water-soluble.[2] They are good complexing agents for metal ions (such as calcium and many transition metals) and have many uses in industrial chemistry. Pyrophosphate is the first member of an entire series of polyphosphates.[3]
The term pyrophosphate is also the name of esters formed by the condensation of a phosphorylated biological compound with inorganic phosphate, as for dimethylallyl pyrophosphate. This bond is also referred to as a high-energy phosphate bond.
https://en.wikipedia.org/wiki/Pyrophosphate
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| Names | |
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| Other names Diphosphate or dipolyphosphate |
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