Adsorption and Photoadsorption States of Benzene Derivatives on Titanium Oxide Studied by NMR

作者：Yuzawa Hayato; Aoki Masanori; Itoh Hideaki; Yoshida Hisao^*

来源：Journal of Physical Chemistry Letters, 2011, 2(15): 1868-1873.

DOI：10.1021/jz200621w

Solid-state NMR spectroscopy revealed the adsorption state of benzene derivatives on TiO2. All of the carbons of adsorbed benzene derivatives exhibited each chemical shift higher than the corresponding carbons of the molecules in the CCl4 solution. This result indicates that the electrons of the adsorbed molecules were withdrawn by TiO2. For the adsorbed benzene, only one narrow signal was observed, indicating that the benzene ring faced parallel to the TiO2 surface and was mobile. On the other hand, for the adsorbed benzene derivatives, the change of the chemical shift was different from carbon to carbon, showing that these benzene rings were inclined at various angles to the TiO2 surface. In addition, the chemical shift was further changed by photoirradiation only for the adsorbed anisole and phenol on the TiO2, indicating that they further changed in the angle and in the interaction strength. These results also demonstrated that the NMR is an efficient analytical method to reveal the adsorption states.

• 出版日期2011-8-4