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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 (  2a  –  2d  ) having different terminal groups (H, F, Cl, and Br). The products (  3a  –  3d  ) were characterized by elemental and mass analyses, FT-IR, and  1  H,  13  C, and  31  P NMR spectroscopies. Furthermore, the structure of compound  3a  was also determined by X-ray crystallography. The thermal behaviors and the spectral properties of the new cyclotriphosphazene compounds (  3a  –  3d  ) were investigated and the results were compared in the series.

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