Structural and fluorescence properties of the 2,2′-methylenediphenoxy and 1,1′-methylenedi-2-naphthoxy cyclotriphosphazene derivatives

• The new 2,2′-Methylenediphenoxy and 1,1′-Methylenedi-2-naphthoxy cyclotriphosphazene derivatives were synthesized.
• Spiro-, ansa, open-chain forms of 2,2’-methylenediphenoxy, and 1,1’-methylenedi-2-naphthoxy cyclotriphosphazene derivatives were obtained.
• All five structures (4, 5, 7, 9 and 10) were found in monoclinic system, C2/c, P21/n or P21/c space groups.
• The fluorescence behaviour of the studied cyclotriphosphazene derivatives were also examined.

In the present work, the partially or fully substituted spiro-, ansa, open-chain forms of 2,2’-methylenediphenoxy, 1,1’-methylenedi-2-naphthoxy cyclotriphosphazene derivatives and their spectral properties were reported. The reactions of hexachlorocyclotriphosphazene [trimer, N3P3Cl6, (1)] with 2,2’-methylenediphenol (2) and 1,1’-methylenedi-2-naphthol (3) in THF produced new cyclotriphosphazene compounds (4–11). All these compounds (4–11) were fully characterized by elemental analysis, FT-IR, MALDI-TOF mass spectrometry, UV Vis, 1H, 13C and 31P NMR spectroscopy. The molecular structures of 4, 5, 7, 9 and 10 were also determined by X-ray crystallography. All five structures were found in monoclinic system, C2/c, P21/n or P21/c space groups. The fluorescence behaviour of the studied cyclotriphosphazene derivatives (9–11) were also examined in THF solution. Compound 11 showed the highest fluorescence emission behaviour that of compounds 4–10.

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