Bis(cyclopentadienyl) titanium dinitrogen chemistry: Synthesis and characterization of a side-on bound haptomer

Tamara E. Hanna, Wesley H. Bernskoetter, Marco W. Bouwkamp, Emil Lobkovsky, Paul J. Chirik

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The titanocene dinitrogen complex [(η5-C5H 2-1,2,4-Me3)2Ti]22, η22-N2) (1-N2) has been prepared both by dihydrogen reductive elimination from the in situ generated monohydride derivative and by alkali metal reduction of the corresponding monoiodide. In the solid state, 1-N2 contains a side-on bound N 2 ligand with an N-N bond length of 1.216(3) Å, consistent with a significant contribution from a two-electron-reduced diazenido ([N 2]2-) fragment. Attempts to maintain side-on coordination of the N2 ligand but increase the wedge dihedral by introducing isopropyl or tert-butyl substituents induced a change in hapticity to end-on and a less activated bridging dinitrogen ligand. The ansa-titanocene dinitrogen complexes rac-[Me2Si(η5-C5H 2-2-SiMe3-4-tBu)2Ti] 2211-N 2)(4-N2) and [Me2Si(η5-C 5Me4)(η5-C5H33- tBu)Ti]221, η1-N2) (5-N2) have also been prepared and crystallographically characterized and shown to have weakly activated, end-on dinitrogen ligands. The latter example coordinates two additional equivalents of N2 upon cooling under a dinitrogen atmosphere in pentane solution.

Original languageEnglish (US)
Pages (from-to)2431-2438
Number of pages8
Issue number9
StatePublished - Apr 23 2007
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry


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