Fluorescence properties of fluorenylidene bridged cyclotriphosphazenes bearing aryloxy groups

Add time:08/25/2019    Source:sciencedirect.com

The synthesis and characterization of the first series of aryloxy full-substituted fluorenylidene open chain and bridged cyclotriphosphazene derivatives (13–18) are reported in this study. The synthetic route utilized includes the reaction of penta-substituted cyclotriphosphazenes (5, 7, 9) with 4,4′-(9-fluorenylidene)diphenol (FDP) (11) and 4,4′-(9-fluorenylidene)dianiline (FDA) (12) to give bridged compounds (13, 15–17) and open chain compounds (14 and 18). The structural investigations of the compounds were verified by elemental analyses, mass spectrometry, UV–Vis, FT-IR, 1H and 31P NMR techniques, and X-ray crystallography (for 13 and 18). The fluorescence behavior of the studied cyclotriphosphazene derivatives were also examined in THF solution. Compound 16 showed a high emission among the studied compounds to investigate its metal sensing properties. This compound showed high selectivity for copper (Cu2+) and iron (Fe2+/Fe3+) ions in solution.

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