Ab initio Study of the Coordination Modes of the Tetrahydroborato Ligand: Structure of the [Cu(BH<inf>4</inf>)(PH<inf>3</inf>)<inf>n</inf>] (n = 1, 2, 3) Complexes

A. Jarid, A. Lledos, Y. Jean, F. Volatron

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Abstract

All‐electron ab initio calculations (MP4/MP2 level) have been performed on [Cu(BH4)(PH3)n] (n = 1, 2, 3) complexes. Full‐geometry optimizations were carried out in each case, and the stationary points were characterized by the diagonalization of the analytically calculated Hessian matrix. The η2 coordination mode, with a tetrahedral arrangement around the copper atom, is the most stable structure for n = 2, while for n = 3 a strongly nonlinear η1 coordination mode is preferred. These results are in agreement with the experimental data available on related complexes. For n = 1, for which there is no experimental data, the η3 structure turns out to be the most stable. The energy differences associated with some changes in the coordination mode (η1 → η2 for n = 3 and η3 → η2 for n = 1) are small. Finally, a mechanism for the exchange between terminal and bridging hydrogen atoms is proposed for each complex under study. Copyright © 1995 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim
Original languageEnglish
Pages (from-to)436-440
JournalChemistry – A European Journal
Volume1
Issue number7
DOIs
Publication statusPublished - 1 Jan 1995

Keywords

  • ab initio calculations
  • copper compounds
  • organometallic compounds
  • tetrahydroborato ligand
  • theoretical chemistry

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