title: N-N bond cleavage of mid-valent Ta(IV) hydrazido and hydrazidium complexes relevant to the Schrock cycle for dinitrogen fixation.
abstract: Chemical reduction of the Ta(V) hydrazido chloride 1 generates the open-shell, mononuclear Ta(IV) hydrazido complex 2, which upon N-methylation yields the corresponding structurally characterized Ta(IV) hydrazidium 6. Chemical reduction of 6 results in N-N bond cleavage to generate a cis/trans mixture of the [Ta(V),Ta(V)] bis(μ-nitrido) product 7 in tetrahydrofuran and the mononuclear Ta(V) parent imide 8 in toluene. These results serve to establish an important foundation for the pursuit of a group-5 metal variant of the Schrock cycle for dinitrogen fixation.
authors.affiliation: Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA.
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Keane
authors.forename: Peter Y
authors.initials: PY
authors.lastname: Zavalij
authors.forename: Lawrence R
authors.initials: LR
authors.lastname: Sita
mesh_terms: D006834:Hydrazines / Q000737:chemistry*; D008958:Models, Molecular; D015394:Molecular Structure; D009584:Nitrogen / Q000737:chemistry*; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D013635:Tantalum / Q000737:chemistry*
chemical_list: D006834:Hydrazines; D009942:Organometallic Compounds; D013635:Tantalum; D009584:Nitrogen