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Dynamics of p-nitroaniline molecules in FSM-type mesoporous silicas studied by solid-state NMR by Yoshihiko Komori; Shigenobu Hayashi is a Materials Science article available to read on EtoBox.
What is Dynamics of p-nitroaniline molecules in FSM-type mesoporous silicas studied by solid-state NMR about?
Dynamics of p-nitroaniline (pNA) in FSM-type mesoporous silicas was investigated by means of 2 H and 13 C solid-state NMR. Deuterated pNA (pNA-d) was loaded to FSM-16 (FSM) and modified FSM samples which were prepared by reactions of FSM with trimethylethoxysilane (C1FSM), n-octyltriethoxysilane (C8FSM) and 3-aminopropyltriethoxysilane (NH 2 FSM). 13 C MAS NMR spectra of the samples at room temperature showed four sharp signals assigned to pNA-d, indicating a fast motion of pNA-d at room temperature. Temperature dependence of 2 H NMR spectra exhibited the presence of two modes of motions, the isotropic motion and another motion such as a wobbling one (Motion I). Analysis of spin-lattice relaxation times (T 1 ) for 2 H spins demonstrated that the apparent activation energies of Motion I were 20 kJ mol À1 for FSM and 31-32 kJ mol À1 for C1FSM and NH 2 FSM. On the other hand, temperature dependence of T 1 of Motion I in C8FSM was complicated presumably because of the motion of alkyl chains of the reacted silylating agent. These results indicated that the dynamics of pNA molecules was varied with the surface properties of the mesopores.
Who reads Dynamics of p-nitroaniline molecules in FSM-type mesoporous silicas studied by solid-state NMR?
It is typically read by researchers, students, and practitioners in Materials Science.
- Author
- Yoshihiko Komori; Shigenobu Hayashi
- Publisher
- Elsevier Science; Elsevier ; Elsevier BV (ISSN 1387-1811)
- Published
- 2004
- Language
- EN
- Field
- Materials Science (Physical Sciences)