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Phosphazenes are inorganic polymers containing alternating phosphorus and nitrogen atoms in the backbone, represented by the general structure ([–N=P(R)_2–]_n). A characteristic feature of phosphazene chemistry is that the substituents attached to phosphorus can be varied extensively. When two or more different substituents are introduced into the same phosphazene polymer chain, the resulting materials are called mixed-substituent or mixed-substituted polyphosphazenes. These polymers are generally synthesized by first preparing a reactive polyphosphazene and then replacing its chlorine substituents by different nucleophiles. The most important starting material is poly(dichlorophosphazene), ([–NPCl_2–]_n). It is obtained by ______ ___ ____ _________ ___ __________ _____ ____ ___ _____ _______ ___.
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