251932-28-2Relevant academic research and scientific papers
Synthesis and characterization of niobium(IV) and tantalum(V) guanidinates and benzamidinates: Molecular structure of the first Nb(IV) guanidinate NbCl2{CyNC(N(SiMe3)2)NCy}2
Decams, Jean Manuel,Hubert-Pfalzgraf, Liliane G.,Vaissermann, Jacqueline
, p. 2885 - 2890 (2008/10/09)
The reactions between niobium pentachloride or NbCl4(THF)2 and [(Et2N)2TaCl3]2 with various lithium guanidinates or benzamidinates were investigated. [NbCl2{RNCR′NR}2] [R=Cy (Cyclohexyl), R′=N(SiMe3)2 (1); R=SiMe3, R′=p-tolyl (2)] [TaCl3{Me3SiNC(p-tolyl)NSiMe3}2] (3) and [(Et2N)2TaCl2{RNCR′NR}] [R=SiMe3, R′=p-tolyl (4) and R=Cy, R′=N(SiMe3)2 (5)] were isolated and characterized by elemental analyses, FT-IR and 1H NMR or ESR spectroscopy. The molecular structure of 1 corresponds to a centrosymmetric, monomeric [NbCl2{CyNC(N(SiMe3)2)NCy}2] species as established by X-ray diffraction studies with the chloride ligands in trans positions. The guanidinate ligand displays a symmetrical σ,σ′-coordination behaviour (Nb-N 2.161(8) A av.) Elsevier Science Ltd.
