Abstract
Treatment of the bis(diisopropylphosphino)pyridine iron dichloride, ( iPrPNP)FeCl2 (iPrPNP = 2,6-(iPr 2PCH2)2(C5H3N)), with 2 equiv of NaBEt3H under an atmosphere of dinitrogen furnished the diamagnetic iron(II) dihydride dinitrogen complex, (iPrPNP)FeH 2(N2). Addition of 1 equiv of PhSiH3 to ( iPrPNP)FeH2(N2) resulted in exclusive substitution of the hydride trans to the pyridine to yield the silyl hydride dinitrogen compound, (iPrPNP)FeH(SiH2Ph)N2, which has been characterized by X-ray diffraction. The solid-state structure established a distorted octahedral geometry where the hydride ligand distorts toward the iron silyl. Both (iPrPNP)FeH2(N2) and (iPrPNP)FeH(SiH2Ph)N2 form η2-dihydrogen complexes upon exposure to H2. The iron hydrides and the η2-H2 ligands are in rapid exchange in solution, consistent with the previously reported "cis" effect, arising from a dipole/induced dipole interaction between the two ligands. Taken together, the spectroscopic, structural, and reactivity studies highlight the relative electron-donating ability of this pincer ligand as compared to the redox-active aryl-substituted bis(imino)pyridines.
Original language | English (US) |
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Pages (from-to) | 7252-7260 |
Number of pages | 9 |
Journal | Inorganic Chemistry |
Volume | 45 |
Issue number | 18 |
DOIs | |
State | Published - Sep 4 2006 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Inorganic Chemistry
- Physical and Theoretical Chemistry