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Characterization of B-H agostic compounds involved in the dehydrogenation of amine-boranes by group 4 metallocenes

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Abstract

For over a decade, amine-borane has been considered as a potential chemical hydrogen vector in the context of a search for cleaner energy sources. When catalyzed by organometallic complexes, the reaction mechanisms currently considered involve the formation of β-BH agostic intermediates. A thorough understanding of these intermediates may constitute a crucial step toward the identification of ideal catalysts. Topological approaches such as QTAIM and ELF revealed to be particularly suitable for the description of β-agostic interactions. When studying model catalysts, accurate theoretical calculations may be carried out. However, for a comparison with experimental data, calculations should also be carried out on large organo-metallic species, often including transition metals belonging to the second or the third row. In such a case, DFT methods are particularly attractive. Unfortunately, triple-ζ all electrons basis sets are not easily available for heavy transition metal elements. Thus, a subtle balance should be reached between the affordable level of calculations and the required accuracy of the electronic description of the systems. Herein we propose the use of B3LYP functional in combination with the LanL2DZ pseudopotential for the metal atom and 6-311++G(2d,2p) basis set for the other atoms, followed by a single point using the DKH2 relativistic Hamiltonian in combination with the B3LYP/DZP-DKH level, as a “minimum level of theory” leading to a consistent topological description of the interaction within the ELF and QTAIM framework, in the context of isolated (gas-phase) group 4 metallocene catalysts.

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  1. Sorbonne Universités, UPMC Univ. Paris 06, MONARIS, UMR 8233, Université Pierre et Marie Curie, 4 Place Jussieu, case courrier 49, F-75252, Paris Cedex 05, France

    Jingwen Zhu, Emilie-Laure Zins & Mohammad Esmaïl Alikhani

  2. CNRS, MONARIS, UMR 8233, Université Pierre et Marie Curie, 4 Place Jussieu, case courrier 49, F-75252, Paris Cedex 05, France

    Jingwen Zhu, Emilie-Laure Zins & Mohammad Esmaïl Alikhani

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  1. Jingwen Zhu
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This paper belongs to Topical Collection Festschrift in Honor of Henry Chermette

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Zhu, J., Zins, EL. & Alikhani, M.E. Characterization of B-H agostic compounds involved in the dehydrogenation of amine-boranes by group 4 metallocenes. J Mol Model 22, 294 (2016). https://doi.org/10.1007/s00894-016-3165-z

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