Synthesis, structure, and properties of niobium and tantalum imido complexes bearing pyrazolato ligands. Crystal structures of Ta(Nt-Bu)(t-Bu_2Pz)_3, Ta(Ni-Pr)(t-Bu_2Pz)_3, Ta(Nt-Bu)(Me_2Pz)_3(py), adn Ta(Nt-Bu)(t-Bu_2Pz)_2(Cl)(py)

摘要

A series of tantalum and niobium imido complexes containing pyrazolato ancillary ligands has been synthesized by salt methathesis reactions with alkylimidotrichlorobis(pyridine)metal starting materials. The complexes M(Nt-Bu)(t-Bu_2Pz)_3 (M = Nb, Ta), Ta(Ni-Pr)(t-Bu_2Pz)_3, Ta(Nt-Bu)(Me_2Pz)_3(py), and M(Nt-Bu)(t-Bu_2Pz)_2(Cl)(py) (M = Nb, Ta) were prepared and completely characterized. The crystal and molecular structures of Ta(Nt-Bu)(t-Bu_2Pz)_3, Ta(Ni-Pr)(t-BGu_2Pz)_3, Ta(Nt-Bui)(Me_2Pz)_3(py), and Ta(Nt-Bu)(t-Pu_2Pz)_2(Cl)(py) are described. The potential use of tantalum imido pyrazolato complexes as precursors for the growth of tantalum nitride films by CVD techniques is discussed.