On the origin of dinitrogen hydrogenation promoted by [(η5- C5Me4H)2Zr]22, η22-N2)

Jaime A. Pool, Wesley H. Bernskoetter, Paul J. Chirik

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85 Scopus citations

Abstract

The origin of the hydrogenation of the dinitrogen ligand in [(η5-C5Me4H)2Zr]2222-N2) has been investigated by a combined computational and experimental study. Density functional theory calculations on the zirconocene dinitrogen complex demonstrate significant imido character in the zirconium nitrogen bonds, arising from effective π-back-bonding from the low-valent zirconium and the side-on bound N2 ligand. The twisted ground-state structure of the N2 complex is a key requirement for nitrogen hydrogenation, as calculations on the model complex [(η5-C5H5)2Zr]2222-N2) reveal reduced overlap as the dihedral angle between the zirconocene wedges approaches 0°. Experimentally, isotopic labeling studies on the microscopic reverse are consistent with a 1,2-addition mechanism for nitrogen hydrogenation.

Original languageEnglish (US)
Pages (from-to)14326-14327
Number of pages2
JournalJournal of the American Chemical Society
Volume126
Issue number44
DOIs
StatePublished - Nov 10 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • Biochemistry
  • Catalysis
  • Colloid and Surface Chemistry

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