engleski

In-situ Temperature Dependent Infrared Spectroscopy of Ammonia Borane Dehydrogenation

Infrared spectroscopy (IR) is one of the commonly employed experimental methods for the study of hydrogen sorption performance of complex hydrides, but its full power is not well recognised. It is used almost exclusively as supporting routine. However, infrared spectra give a unique insight into the system at molecular level and they are very rich in contained information. Furthermore, it enables a simple and accurate insight in changes at molecular level. For example, detection of phase changes is enabled by simple and straightforward analysis of perturbation-dependent (where perturbation can be temperature, pressure etc.) transmission baseline, while molecular background of these transitions are obtained by the analysis of other spectral features. An elegant way to identify mutual changes among the involved functional groups is 2D correlation analysis, which enables more focused and detailed insight into particular process. Also, IR spectroscopy is well recognised as one of the most powerful experimental techniques for investigation of hydrogen bonding. The power of this technique will be illustrated here on the example of dehydrogenation of ammonia borane, where dihydrogen bonding plays a crucial role and some important mechanistic aspects remained still unexplained.

Infrared Spectroscopy; Hydrogen Storage; Ammonia Borane; Complex Hydrides; Dehydrogenation

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