956511-07-2Relevant academic research and scientific papers
Dinitrogen coordination and cleavage promoted by a vanadium complex of a σ,π,σ-donor ligand
Vidyaratne, Indu,Crewdson, Patrick,Lefebvre, Emeric,Gambarotta, Sandro
, p. 8836 - 8842 (2007)
The deprotonation of the tripyrrole MeTPH2 [MeTPH2 = 2,5-[(2-pyrrolyl)(C6H5)2C] 2(MeNC4H2)], containing one N-methylated pyrrolyl ring, was carried out with 2 equiv of KH. The corresponding dipotassium salt reacted with VCl3(THF)3 to afford the complex [(MeTP)VCl(THF)]·THF (1). While the two lateral pyrrolide rings are σ-bonded, the central one is perpendicularly oriented in a sort of π-fashion. However, the bond distances clearly indicated that only the quaternized N atom is forming a bonding contact. Subsequent reduction of 1 with Na yielded the corresponding divalent complex [(MeTP)V(THF)]·(C 7H8)0.5 (2) where the central N-methylated ring adopted a more regular π-orientation. When treated with a strong Lewis acid (AlMe3), THF was extracted from the vanadium coordination sphere, forming the dinuclear dinitrogen complex [(MeTP)V(μ-N2)] 2·(C7H8)2.9 (3). Reduction of 3 with potassium graphite gave cleavage of dinitrogen, affording the mixed-valent nitride-bridged complex [(MeTP)V(μ-N)]2·(THF) (4).
