Carboxyl derivatives of phosphazenes

The review describes the modern methods of synthesis and chemical modification of carboxylcontaining phosphazenes. The possibility of their use in the synthesis of polyamides, epoxy resins, star-shaped and structured polymers, hydrogels, and metal complexes is considered. Carboxyl-containing phosphazenes and their derivatives are of great interest for medicine, electronics, photonics, and design of multipurpose hightech composite materials, offering wide opportunities for further research and application.