Synthesis And Properties Of Cyclotriphosphazene Derivatives With Tetrazole And Oxadiazole Groups

Cyclotriphosphazene derivatives can be widely used in catalysis, medicine, agriculture, fire-retardant and many other areas beause of their special properties. Tetrazole derivatives can be widely used in national defense technology, medicine, and agriculture. Oxadiazole derivatives have special biological and optical activity, can be used as pesticides, antibacterial agents, medicine, inhibitors, and electronic transport materials in organic light emitting device(OLED).In this thesis, we introduced tetrazole groups into cyclotriphosphazenes to obtain hexakis-(4-tetrazolylphenyloxy)cyclotriphosphazene(A2) with six tetrazole groups and tri-(5-tetrazolyl-biphenyl-2,2-dioxy)cyclotriphosphazene(B4) with three tetrazole groups. In the basis of A2 and B4, we prepared the hexakis-(4-cyanoethyltetrazolylphenyloxy)- cyclotriphosphazene(A3) with cyanoethyltetrazole groups, and the crosslinked polymers poly[hexakis-(4-(5-phenyl-2-oxadiazol)-phenyloxy)cyclotriphosphazene](A4), poly[tri-(5- (5-phenyl-2-oxadiazol)biphenyl-2,2-dioxy)cyclotriphosphazene] (B5) with oxadiazole groups. Their structures were characterized by FT-IR, 1HNMR, 13CNMR, 31PNMR and MS. Moreover, the optical and acidic properties of A2 were researched systematically. Its UV- Vis spectrum showed that its maximun absorption peak is at 246.5nm and acid-base titration result showed the ratio of it reacting with NaOH in neutralization is about 1:5.Besides, the state of aggregation, specific surface area and optical activity of A4 and B5 were compared. From the FS-SEM images and BET tests, A4 assembled as spherical particles with size distribution of 10-15μm, the specific surface area of it is 10.44 m~2/g. B5 formed the porous structure with pore size distribution of 10-50 nm, the specific surface area of it is 59.76 m~2/g. From the fluorescence spectrums, the maximun excitation wavelength of A4 and B5 are 368 nm and 387 nm, belonging to ultraviolet light. The maximun emission wavelength of A4 and B5 are 427 nm and 468 nm, so they have the high excitation levels. From the fluorescence microscopy images, the fluorescence of A4 is observable whereas the fluorescence of B5 is week for its dark colour.