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The Role of Solvent on the Mechanism of Proton Transfer to Hydride Complexes: The Case of the [W~3~PdS~4~H~3~(dmpe)~3~(CO)]^+^ Cubane Cluster by Andrés G. Algarra; Manuel G. Basallote; Marta Feliz; M. Jesús Fernández‐Trujillo; Rosa Llusar; Vicent S. Safont is a Chemistry article available to read on EtoBox.

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The kinetics of reaction of the [W(3)PdS(4)H(3)(dmpe)(3)(CO)](+) hydride cluster (1(+)) with HCl has been measured in dichloromethane, and a second-order dependence with respect to the acid is found for the initial step. In the presence of added BF(4) (-) the second-order dependence is maintained, but there is a deceleration that becomes more evident as the acid concentration increases. DFT calculations indicate that these results can be rationalized on the basis of the mechanism previously proposed for the same reaction of the closely related [W(3)S(4)H(3)(dmpe)(3)](+) cluster, which involves parallel first- and second-order pathways in which the coordinated hydride interacts with one and two acid molecules, and ion pairing to BF(4) (-) hinders formation of dihydrogen bonded adducts able to evolve to the products of proton transfer. Additional DFT calculations are reported to understand the behavior of the cluster in neat acetonitrile and acetonitrile-water mixtures. The interaction of the HCl molecule with CH(3)CN is stronger than the W-H...HCl dihydrogen bond and so the reaction pathways operating in dichloromethane become inefficient, in agreement with the lack of reaction betw

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Author

Andrés G. Algarra; Manuel G. Basallote; Marta Feliz; M. Jesús Fernández‐Trujillo; Rosa Llusar; Vicent S. Safont

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Ltd.; Wiley (ISSN 0947-6539)

Published

2010

Language

EN

Field

Chemistry (Physical Sciences)