The Effect of the "Inert" Counteranions in the Deprotonation of the Dihydrogen Complex trans-[FeH(η<sup>2</sup>-H<inf>2</inf>)(dppe) <inf>2</inf>]<sup>+</sup>: Kinetic and Theoretical Studies

Manuel G. Basallote, Maria Besora, Joaquín Durán, M. Jesús Fernández-Trujillo, Agustí Lledós, M. Angeles Máñez, Feliu Maseras

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36 Citations (Scopus)

Abstract

Kinetic studies indicate that trans-[FeH(H2)(dppe)2]+ reacts with an excess of NEt3 to form cis-[FeH2(dppe)2] in a single kinetic step. The second-order rate constant is strongly affected by the presence of added salts, an acceleration being observed with BF4- and PF6- salts and a deceleration with BPh4-. Theoretical calculations indicate that the role of the accelerating anions consists of the formation of ion pairs that provide a more effective reaction pathway for deprotonation. However, for the ionpair with the bulky BPh4- anion, steric crowding in the proximities of the dihydrogen ligand hinders the approach of the base, and the reaction is decelerated. Copyright © 2004 American Chemical Society.
Original languageEnglish
Pages (from-to)2320-2321
JournalJournal of the American Chemical Society
Volume126
Issue number8
DOIs
Publication statusPublished - 3 Mar 2004

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