fosfesterit

Fosfesterit, known in English as phosphate esters, are esters of phosphoric acid formed by reaction with one or more alcohol groups. They encompass mono-, di-, and triesters, depending on how many hydroxyl groups of the phosphoric acid are substituted. In biology, phosphate diesters are central to the backbone of nucleic acids, linking nucleotides through phosphodiester bonds.

Chemically, phosphate esters are prepared by esterification of phosphoric acid or related phosphorus reagents with alcohols under dehydration conditions, often using catalysts or chlorophosphate intermediates. They are diverse in structure and properties, ranging from colorless liquids to solids, with a wide spectrum of boiling points and hydrophobicities. They tend to hydrolyze in water or under basic or acidic conditions, releasing alcohols and phosphoric acid or its derivatives.

Common examples include triethyl phosphate, triphenyl phosphate, and tricresyl phosphate, as well as a broad class of dialkyl and diaryl phosphates. They are widely used as plasticizers for polyvinyl chloride and other polymers, lubricants and solvents, and as flame retardants and stabilizers in various materials. Their functionality is linked to the ability of the phosphate group to accommodate multiple alkyl or aryl substituents, altering polarity, flexibility, and thermal properties of host matrices.

Safety and environmental considerations vary by specific ester. Some phosphate esters can be irritants or pose toxicity concerns; certain flame-retardant esters are regulated due to persistence or health effects. Proper handling and disposal follow specific product safety guidelines.