524713-75-5Relevant academic research and scientific papers
Metalated 1,3-azaphospholes: η1-(1H-1,3-Benzazaphosphole-P)M(CO)5 and μ2-[(1,3-Benzazaphospholide-P)(cyclopentadienide)nickel] complexes
Heinicke, Joachim,Gupta, Nidhi,Singh, Shreeyukta,Surana, Anushka,Kuehl, Olaf,Bansal, Raj K.,Karaghiosoff, Konstantin,Vogt, Martin
, p. 2869 - 2876 (2002)
1H-1,3-Benzazaphospholes react with M(CO)5(THF) (M = Cr, Mo, W) to give thermally and relatively air stable η1-(1H-1,3-Benzazaphosphole-P)M(CO)5 complexes. The 1H- and 13C-NMR-data are in accordance with the preservation of the phosphaaromatic π-system of the ligand. The strong upfield 31P coordination shift, particularly of the Mo and W complexes, forms a contrast to the downfield-shifts of phosphine-M(CO)5 complexes and classifies benzazaphospholes as weak donor but efficient acceptor ligands. Nickelocene reacts as organometallic species with metalation of the NH-function. The resulting ambident 1,3-benzazaphospholide anions prefer a μ2-coordination of the η5-CpNi-fragment at phosphorus to coordination at nitrogen or a η3-heteroallyl-η5-CpNi-semisandwich structure. This is shown by characteristic NMR data and the crystal structure analysis of a η5-CpNi-benzazaphospholide. The latter is a P-bridging dimer with a planar Ni2P2 ring and trans-configuration of the two planar heterocyclic phosphido ligands arranged perpendicular to the four-membered ring.
