Di-Iron Aza Diphosphido Complexes: Mimics for the Active Site of Fe-Only Hydrogenase, and Effects of Changing the Coordinating Atoms of the Bridging Ligand in [Fe<sub>2</sub>{μ-(ECH<sub>2</sub>)<sub>2</sub>NR}(CO)<sub>6</sub>]
作者:Pankaj Das、Jean-François Capon、Frédéric Gloaguen、François Y. Pétillon、Philippe Schollhammer、Jean Talarmin、Kenneth W. Muir
DOI:10.1021/ic048772+
日期:2004.12.1
The bis(phosphido)-bridged complex [Fe-2(mu-PPhH)(2)(CO)(6)] (1) undergoes double deprotonation to give the phosphorus-centered dianionic derivative [Fe-2(mu-PPh)(2)(CO)(6)](2-) (2) which in turn reacts with the tertiary base RN(CH2Cl)(2) to give [Fe-2(PPhCH2)(2)NR}-(CO)(6)] (3) in moderate yield. Treatment of 3 with HBF4.Et2O affords the N-protonated species [Fe-2(PPhCH2)(2)NHR}(CO)(6)] BF4 (4). The structural changes to the heavy atom skeleton of 3 arising from protonation are slight, the most obvious being a ca. 0.03 Angstrom lengthening of the N-C bonds.The bis(phosphido)-bridged complex [Fe-2(mu-PPhH)(2)(CO)(6)] (1) undergoes double deprotonation to give the phosphorus-centered dianionic derivative [Fe-2(mu-PPh)(2)(CO)(6)](2-) (2) which in turn reacts with the tertiary base RN(CH2CI)(2) to give [Fe-21(PPhCH2)(2)NR}-(CO)(6)] (3) in moderate yield. Treatment of 3 with HBF4.Et2O affords the N-protonated species [Fe-2(PPhCH2)(2)NHR}(CO)(6)] BF4 (4). The structural changes to the heavy atom skeleton of 3 arising from protonation are slight, the most obvious being a ca. 0.03 Angstrom lengthening of the N-C bonds.