Addition and elimination reactions of H2 in ruthenaborane clusters: a computational study

Rabaa, Hassan ; Ghosh, Sundargopal ; Sundholm, Dage ; Halet, Jean-Francois ; Saillard, Jean-Yves (2014) Addition and elimination reactions of H2 in ruthenaborane clusters: a computational study Journal of Organometallic Chemistry, 761 . pp. 1-9. ISSN 0022-328X

Full text not available from this repository.

Official URL:

Related URL:


Ruthenaborane clusters have been modelled by performing density functional theory calculations using the B3LYP functional. The calculations gain insights into hydrogen storage and the H–H bond activation by ruthenaboranes. To study the nature of the chemical bond of H2 molecules attached to ruthenaboranes, we carried out structural optimizations for different ruthenaborane clusters and determined transition state structures for their hydrogenation addition/elimination reactions. Calculations of the reaction pathways yielded different transition-state structures involving molecular hydrogen bonded to the cluster or formation of metal hydrides. The H–H bond of H2 seems to be activated by the ruthenaborane clusters as activation energies of 24–42 kcal/mol were calculated for the H2 addition reaction. The calculated Gibbs free energy for the H2 addition reaction is 14–27 kcal/mol. The calculated activation energies and the molecular structures of the [(C5Me5)Ru2B10H16], [(C5Me5)Ru2B8H14] and [(C5Me5)Ru2B8H12] clusters with different degree of hydrogenation are compared. The mechanisms of the H2 addition and elimination reactions of the studied clusters suggest that they might be useful as hydrogen storage materials due to their ability to activate the H–H bond. They also serve as an example of the ability of hypoelectronic metallaboranes to reversibly or irreversibly bind hydrogen.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Ruthenaborate Clusters; DFT; Structure Optimization; Hydrogenation–Dehydrogenation Mechanism; Activation of H–H Bond
ID Code:108914
Deposited On:31 Jan 2018 12:20
Last Modified:31 Jan 2018 12:20

Repository Staff Only: item control page