Synthesis of new cyclotriphosphazene derivatives bearing Schiff bases and their thermal and absorbance properties.

In this study, a series of cyclotriphosphazene derivatives containing a Schiff base (3a-3d) were synthesized by the reactions of hexachlorocyclotriphosphazene (1) with bis-aryl Schiff bases ( - ) having different terminal groups (H, F, Cl, and Br). The products ( - ) were characterized by elemental and mass analyses, FT-IR, and H, C, and P NMR spectroscopies. Furthermore, the structure of compound was also determined by X-ray crystallography. The thermal behaviors and the spectral properties of the new cyclotriphosphazene compounds ( - ) were investigated and the results were compared in the series.