Journal of the Chinese Chemical Society p. 368 - 375 (2016)
Update date:2022-08-30
Topics:
Badiei, Alireza
Yadavi, Marzieh
Shayesteh, Alireza
Jafari, Maryam
Ziarani, Ghodsi Mohammadi
Fluorene-di-ammonium-functionalized mesoporous silica (FDMS) was prepared through post synthesis grafting method of SBA-15. The obtained material was characterized by means of small and wide angle X-ray diffraction, nitrogen adsorption-desorption, Fourier transform infrared spectroscopy, Raman spec- troscopy, thermo gravimetric analysis and elemental analysis. The results showed that the original structure of SBA-15 is preserved after the post grafting procedure. Surface area, pore size and pore volume de- creased by attaching functional groups to the pore surface. The grafted amount of fluorene on the surface of SBA-15 was 0.50 mmol with yield about 40.6 %. The emission spectra of FDMS was studied in acid me- dia and discussed in details. Computational studies were performed in order to obtain a detailed electronic description of the mechanism of FDMS fluorescence by H+ as well as studying the structure and bonding in the (FDMS)H+. The structural change between FDMS and protonated form can serve as an effective candidate for pH-indicator, and might be used as acid-dependent molecular-sensor models for advanced applications in optical sensors in the future.
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