“…Longer-chain species, such as [C1 3 P=N-PC1 2 =N-PC1 3 ]®[PC1 6 P, are formed by successive chain-building steps with ammonium chloride and phosphorus pentachloride, 145 and these compounds can also be identified by 31 P NMR spectra. For example, the triphosphazene salt shown above yields a triplet spectrum; one-of these lines is resolvable to a doublet (PC1 3 ), one to a triplet (PC1 2 ), and one is unresolved (PC1 6 0 ).…”