Chapter 2: Isotopes in the FTIR investigations of solid surfaces
Published:27 Jun 2014
K. Hadjiivanov, M. Mihaylov, D. Panayotov, E. Ivanova, and K. Chakarova, in Spectroscopic Properties of Inorganic and Organometallic Compounds: Techniques, Materials and Applications, Volume 45, ed. R. Douthwaite, S. Duckett, and J. Yarwood, The Royal Society of Chemistry, 2014, vol. 45, ch. 2, pp. 43-78.
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In this chapter the recent achievements in the use of isotopically labelled molecules for characterization of surfaces by FTIR and other vibrational spectroscopy techniques is reviewed. A brief theoretical background is provided where special attention is paid on the deviations of the experimental results from the theory. Then the application of D-, 13C-, 15N- and 18O-labelling is consecutively considered. For deuterium we first discuss the properties of surface OD groups and then the use of deuterated molecular probes (D2, CHD2OH, C2D5OH, C6D12). When describing 13C-labelled compounds the application of 13CO and 13C18O is compared and then other labelled compounds (13CO2, D13CN, 13CH3OH, etc.) are considered. In the next section 15N2, NO isotopologues, (15NH2)2CO and aminoacids are discussed. For 18O-labelling we first consider the use of surfaces enriched to 18O, then different O2 adsorption and finally, H218O and C18O. In all cases the application of isotopic labelling for clarifying the mechanisms of catalytic reactions is also considered.