Oxygen binding to [Pd(L)(L′)] (L= NHC, L′ = NHC or PR 3, NHC = N -heterocyclic carbene). Synthesis and structure of a paramagnetic trans -[Pd(NHC)21-O2) 2] complex

Xiaochen Cai, Subhojit Majumdar, George C. Fortman, Catherine S.J. Cazin, Alexandra M.Z. Slawin, Charles Lhermitte, Rajeev Prabhakar, Meaghan E. Germain, Taryn Palluccio, Steven P. Nolan, Elena V. Rybak-Akimova, Manuel Temprado, Burjor Captain, Carl D. Hoff

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43 Scopus citations

Abstract

The reactivity of a number of two-coordinate [Pd(L)(L′)] (L = N-heterocyclic carbene (NHC) and L′ = NHC or PR3) complexes with O2 has been examined. Stopped-flow kinetic studies show that O2 binding to [Pd(IPr)(P(p-tolyl)3)] to form cis-[Pd(IPr)(P(p-tolyl)3)(η2-O2)] occurs in a rapid, second-order process. The enthalpy of O2 binding to the Pd(0) center has been determined by solution calorimetry to be -26.2(1.9) kcal/mol. Extension of this work to the bis-NHC complex [Pd(IPr)2], however, did not lead to the formation of the expected diamagnetic complex cis-[Pd(IPr)22-O2)] but to paramagnetic trans-[(Pd(IPr)21-O2)2], which has been fully characterized. Computational studies addressing the energetics of O2 binding have been performed and provide insight into reactivity changes as steric pressure is increased.

Original languageEnglish (US)
Pages (from-to)1290-1293
Number of pages4
JournalJournal of the American Chemical Society
Volume133
Issue number5
DOIs
StatePublished - Feb 9 2011

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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