Synthesis, optical, and structural properties of bisphenol-bridged aromatic cyclic phosphazenes

Abstract

Phenoxy- and naphthoxy-substituted bisphenol-bridged cyclic phosphazenes were synthesized in 2 steps andtheir thermal, photophysical, and electrochemical properties were investigated. The structures of the cyclic phosphazenecompounds were determined by ESI-MS mass spectrometry and 1 H, 13 C, and 31P NMR spectroscopies. The photophysical studies of phenoxy- and naphthoxy-substituted bridged cyclophosphazenes were investigated by means of absorptionand fluorescence spectroscopies in different solvents. Thermal and electrochemical properties of the target compoundswere also studied. Furthermore, the excimer emissions through intramolecular interactions in solution and in solid statewere investigated by fluorescence spectroscopy and the theoretical calculations were performed in detail using DFT.