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Ionic Liquid Bulk and Interface Properties: Electronic by Till Cremer

By Till Cremer

In this thesis, until Cremer investigates the majority houses of ionic beverages (IL), the IL/vacuum interface and the IL/solid interface. For those experiences the writer basically makes use of angle-resolved X-ray photoelectron spectroscopy lower than ultrahigh vacuum stipulations. ILs signify a category of fabrics with exact physico-chemical houses. Many functions reap the benefits of the super low vapor strain of aprotic ILs to manufacture everlasting, non-volatile liquid coatings on reliable fabrics. the writer specializes in matters concerning skinny IL coatings, specifically bearing on new catalytic options similar to the supported ionic liquid part (SILP) and good catalyst with ionic liquid layer (SCILL) platforms. until Cremer offers a few primary contributions to the hot box of "Ionic Liquid floor and Interface Science". Highlights are his effects bearing on anion/cation-interactions and the expansion of ultrathin layers of ionic beverages on a variety of substrates within the context of supported ionic liquid catalysis. His effects have considerably contributed to the current point of figuring out within the box and hence he's writer and coauthor of ten guides at the subject in high-ranked journals.

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Additional resources for Ionic Liquid Bulk and Interface Properties: Electronic Interaction, Molecular Orientation and Growth Characteristics

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Differentiation into squares and circles relate to discussion in the text. c Correlation of Chetero 1s BE with Kamlet-Taft parameter β (values for [C8C1Im]Cl, [C8C1Im]Br and [C8C1Im][FAP] are unpublished data from the Spange group, remaining values from Ref. 1) with the hydrogen atom at C2 contributing strongest (see also next section) [6, 13, 26, 27, 69]. To study the possible influence of H-bonding on the Chetero 1s BE discussed in the preceding paragraph, two representative ILs, namely [C8C1C1Im]Br and [C8C1C1Im][Tf2N], in which a methyl group in C2-position replaces the most acidic proton, were measured.

As mentioned in the introduction, this signal corresponds to the five carbon atoms bound to the nitrogen atoms of the imidazolium ring. 0 eV). They correspond to the perfluorated carbon atoms of the anions with specific local electronic environments (see also Table A3 in the Appendix). 4a shows a close-up of the cation-related C 1s signals focusing on the region including only Calkyl and Chetero. Inspection of this figure and of the fit results in Table A3 reveals that the Chetero peak is subject to a differential shift with respect to the Calkyl peak, depending on the nature of the anion.

In this case excess charges very close to the integer values of +1e for the cation and −1e for the anion are expected. Thus, the observed highest BE values of the ring signals for the large and weakly coordinating anions indicate a situation where no charge transfer occurs. For the smaller and more strongly coordinating anions, which are closer to the imidazolium ring, the much more localized charge is transferred from the anion to the cation, leading to a less positively charged ring and in turn to lower XPS BEs.

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