Pressure-enhanced surface interactions between nano-TiO2 and ionic liquid mixtures probed by high pressure IR spectroscopy
文献情報
Hai-Chou Chang, Jyh-Chiang Jiang, Meng-Hsiu Kuo, Ding-Tsai Hsu, Sheng Hsien Lin
The pressure-dependent interactions between the ionic liquid mixture ([MPI][I1.5]) and nano-TiO2 surfaces have been studied up to 2.5 GPa. The results of infrared spectroscopic profiles of [MPI][I1.5] and [MPI][I1.5]–nano-TiO2 indicated that no appreciable changes in the C–H stretching bands with the addition of nano-TiO2 were observed under ambient pressure. As the pressure was elevated to 0.7 GPa, the C–H stretching absorption of [MPI][I1.5] underwent band-narrowing and red-shifts in frequency. In contrast to the results of [MPI][I1.5], the spectra of [MPI][I1.5]–nano-TiO2 do not show dramatic changes under high pressures. A possible explanation for this observation is the formation of certain pressure-enhanced C–H⋯nano-TiO2 interactions around the imidazolium C–H and alkyl C–H groups. As imidazolium C–H⋯I− is replaced by the weaker imidazolium C–H⋯polyiodide, the splitting of the imidazolium C–H stretching bands was observed. The experimental results indicate that both nano-TiO2 and polyiodides are capable of disturbing the self-assembly of ionic liquids. This study suggests the possibility to tune the efficiency of dye-sensitized solar cells via a high pressure method.
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Physical Chemistry Chemical Physics

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lohepta[1,2-a]naphthalen-5-one structure (3R,4aR,7aS,9aR,10S,11R,13aR,13bS,15aS,15bR)-3,11-Dihydroxy-10-(hydroxymethyl)-4,4,7a,10,13a,15b-hexamethyl-1,2,3,4,4a,7,7a,8,9,9a,10,11,12,13,13a,13b,14,15,15a,15b-icosahydro-5H-naphtho[2',1':4,5]cyc
lohepta[1,2-a]naphthalen-5-one structure](https://static.chemtradehub.com/structs/538/53800-21-8-9f18.webp)

![5-Bromo-3-isopropyl-1H-pyrrolo[2,3-b]pyridine structure 5-Bromo-3-isopropyl-1H-pyrrolo[2,3-b]pyridine structure](https://static.chemtradehub.com/structs/125/1256819-54-1-8620.webp)
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