Vanillinato-Substituted Monospirocyclotriphosphazenes: Synthesis, Spectroscopic and Crystallographic Characterizations, and Thermal Properties

The reactions of one equimolar amount of monospirocyclotriphosphazenes bearing 2,2′-dioxybiphenyl with one, two, three and four equimolar amounts of potassium vanillinate were used to produce the vanillinato-substituted monospirocyclotriphosphazenes. The structures of new phosphazene derivatives were characterized by means of elemental analysis, IR and NMR ( 1 H, 13 C, and 31 P) spectroscopic techniques. The molecular and crystal structures of mono and tetra vanillinato-substituted monospirocyclotriphosphazenes were examined using X-ray crystallography. The thermal degradation properties of all new compounds were determined using thermal gravimetric analysis (TGA) techniques.