547701-34-8Relevant academic research and scientific papers
Tuning low-coordinate metal environments: High spin d5-d7 complexes supported by bis(phosphinimino)methyl ligation
Evans, David J.,Hill, Michael S.,Hitchcock, Peter B.
, p. 570 - 574 (2003)
Treatment of FeCl2 with the lithium derivative of [CH2(Ph2P=NC6H2Me3- 2.4.6)2] in THF and crystallisation from Et2O gave the 'ate' complex [{CH(Ph2PNC6H2Me3- 2.4.6)2}Fe(μ-Cl)2Li(THF)(OEt2)] in which the iron is four-coordinate and the chlorides bridge to lithium. Treatment of [M{N(SiMe3)}2] (M = Mn, Fe, Co) with [CH2 (Ph2P=NC6H2Me3-2.4.6)2] in toluene afforded the complexes [{CH(Ph2PNC6 H2Me3-2.4.6)2} MN(SiMe3)2] which all feature essentially planar N(1)-N(2) -N(3)-M coordination. The carbanionic character of the bis(phosphinimino)methyl ligand results in close C(1)-M contacts in both the Mn and Co complexes effectively raising the coordination number to four. The analogous iron compound is strictly three-coordinate as demonstrated by X-ray crystallography and 57Fe Moessbauer. However protonolysis of this compound with Ph3COH yields the iron alkoxide [{CH(Ph2PNC6 H2Me3-2.4.6)2} FeOCPh3] that features a close C(1)-Fe contact of 2.375 A. Although the iron centre in this complex is only marginally pyramidalised by this contact, its 57Fe Moessbauer spectrum indicates a significant perturbation to the local electronic environment at the metal.
