CCB Colloquium presentation by Dr. Balaji Jagirdar, Indian Institute of Science, Bangalore, India.
Host: Alan Goldman
Talk Title: "Hydrogen: Our Efforts Towards its Activation, Cleavage, Generation, and Storage"
Abstract: The study of the binding of H2 to a metal center and its subsequent activation has been intensively pursued. The σ-coordination and the heterolytic activation of H-X (X = Si, B) bonds of silanes and borane-Lewis base adducts have close resemblances to those of H2 and are quite significant since they serve as models for the activation and functionalization of the C-H bond of methane and other alkanes. The partial oxidation of methane in natural gas to a liquid fuel, for example, methanol, is one of the holy grails in the field of catalysis.1 Research efforts towards the activation of H-H and other σ-bonds using certain superelectrophilic metal complexes will be discussed.2
In addition, hydrogen with a calorific value that is three times as large as that of the liquid hydrocarbons and also its clean burning nature, clearly holds immense potential to become an energy source of the future.3a Storage of H2 in large quantities for on-board applications remains a major impediment for its widespread usage in the so-called hydrogen economy. A safe way of hydrogen storage for on-board applications is in the chemical form. In this regard, amine-boranes, in particular, ammonia-borane (H3N·BH3, AB) considered a promising solid state hydrogen storage material with a potential capacity of 19.6 wt % of H2 has been attracting a great deal of attention in recent times.3b Hydrogen release from AB can be accomplished by various routes. In this presentation, our efforts on the release of hydrogen from amine-boranes and storage of hydrogen in nanomaterials will also be discussed.4
1. Arndtsen, B. A.; Bergman, R. G.; Mobley, T. A.; Peterson, T. H. Acc. Chem. Res. 1995, 28, 154.
2. Nagaraja, C. M.; Parameswaran, P.; Jemmis, E. D.; Jagirdar, B. R. J. Am. Chem. Soc. 2007, 129, 5587.
3. (a) Schlapbach, L.; Züttel, A. Nature 2001, 414, 353; (b) Stephens, F. H.; Pons, V.; Baker, R. T. Dalton Trans. 2007, 2613.
4. (a) Kalidindi, S. B.; Indirani, M.; Jagirdar, B. R. Inorg. Chem. 2008, 47, 7424; (b) Kalidindi, S. B.; Vernekar, A. A.; Jagirdar, B. R. Phys. Chem. Chem. Phys. 2009, 11, 770; (c) Kalidindi, S. B.; Jagirdar, B. R. Inorg. Chem. 2009, 48, 4524.