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

Abstract

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