Synthesis, characterization, and spectroscopic properties of the new type of aminoquinoline-modified cyclotriphosphazenes

Abstract

The aminolysis reactions of hexachlorocyclotriphosphazene, [N₃P₃Cl₆] (1a) and dispiro-2,2′-biphenoxydichlorocyclotriphosphazene [N₃P₃Cl₂[(2,2′-biphenoxy)₂] (1b) with 6-aminoquinoline (2) were carried out to examine the spectroscopic properties of cyclotriphosphazene derivatives combined with 6-aminoquinoline. For the first time, two new aminoquinoline-substituted cyclotriphosphazene derivatives (3a, b) were obtained in this study. Both compounds (3a, b) have been characterized by elemental analysis, FT-IR analysis, MALDI-TOF mass spectrometry, ¹³C, ¹H, and ³¹P NMR spectroscopies. The molecular structure of 3b has been confirmed by single crystal X-Ray crystallography. The crystal structure of 3b was investigated in detail to determine the remarkable intermolecular interactions. Furthermore, the photophysical properties of compounds 3a and 3b were determined by using UV/vis and fluorescence spectroscopies.

Graphical Abstract

Keywords:

• Cyclophosphazene
• amine
• spectroscopy
• quinoline
• crystal structure