Abstract
A series of new iron(II) complexes that contain cyclic diphosphine ligands with pendant amine bases, P2 RN2 R′, have been synthesized and characterized (where P 2 RN2 R′ are substituted 1,5-diaza-3,7-diphosphacyclooctanes). These compounds include [Fe(P 2 PhN2 Ph)(CH3CN) 4](BF4)2 (5), cis-[Fe(P2 PhN2 Ph)2(CH3-CN) 2](BF4)2 (6a), cis-[Fe(P2 PhN2 Bz)2(CH3CN) 2](BF4)2 (6b), cis-[Fe(P2 CyN2 Bz)2(CH3CN) 2](BF4)2 (6c), trans[HFe(P2 PhN2 Ph)2(CH3CN)](BF 4) (7), and cis-Fe(P2 PhN2 Ph)2(Cl)2 (8). The molecular structures of 5, 6b, and 7 have been confirmed by X-ray diffraction studies. For all complexes the cyclic diphosphine ligands contain one six-membered ring in a chair conformation and one six-membered ring in a boat conformation. For complex 7, the two rings that are in boat conformations result in N-H distances between the pendant amine nitrogens and the hydride ligand of 2.6 to 2.7 Å. Protonation of the pendant bases in complex 7 has been found to form several products. A structural assignment for a dominant protonated isomer has been assigned on the basis of 1H, 31P, and 15N NMR spectroscopic techniques.
| Original language | English |
|---|---|
| Pages (from-to) | 5003-5009 |
| Number of pages | 7 |
| Journal | Organometallics |
| Volume | 26 |
| Issue number | 20 |
| DOIs | |
| Publication status | Published - Sep 24 2007 |
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ASJC Scopus subject areas
- Inorganic Chemistry
- Organic Chemistry
Cite this
Syntheses and structural characterizations of iron(II) complexes containing cyclic diphosphine ligands with positioned pendant nitrogen bases. / Jacobsen, George M.; Shoemaker, Richard K.; McNevin, Michael J.; Dubois, M. Rakowski; Dubois, Daniel L.
In: Organometallics, Vol. 26, No. 20, 24.09.2007, p. 5003-5009.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Syntheses and structural characterizations of iron(II) complexes containing cyclic diphosphine ligands with positioned pendant nitrogen bases
AU - Jacobsen, George M.
AU - Shoemaker, Richard K.
AU - McNevin, Michael J.
AU - Dubois, M. Rakowski
AU - Dubois, Daniel L.
PY - 2007/9/24
Y1 - 2007/9/24
N2 - A series of new iron(II) complexes that contain cyclic diphosphine ligands with pendant amine bases, P2 RN2 R′, have been synthesized and characterized (where P 2 RN2 R′ are substituted 1,5-diaza-3,7-diphosphacyclooctanes). These compounds include [Fe(P 2 PhN2 Ph)(CH3CN) 4](BF4)2 (5), cis-[Fe(P2 PhN2 Ph)2(CH3-CN) 2](BF4)2 (6a), cis-[Fe(P2 PhN2 Bz)2(CH3CN) 2](BF4)2 (6b), cis-[Fe(P2 CyN2 Bz)2(CH3CN) 2](BF4)2 (6c), trans[HFe(P2 PhN2 Ph)2(CH3CN)](BF 4) (7), and cis-Fe(P2 PhN2 Ph)2(Cl)2 (8). The molecular structures of 5, 6b, and 7 have been confirmed by X-ray diffraction studies. For all complexes the cyclic diphosphine ligands contain one six-membered ring in a chair conformation and one six-membered ring in a boat conformation. For complex 7, the two rings that are in boat conformations result in N-H distances between the pendant amine nitrogens and the hydride ligand of 2.6 to 2.7 Å. Protonation of the pendant bases in complex 7 has been found to form several products. A structural assignment for a dominant protonated isomer has been assigned on the basis of 1H, 31P, and 15N NMR spectroscopic techniques.
AB - A series of new iron(II) complexes that contain cyclic diphosphine ligands with pendant amine bases, P2 RN2 R′, have been synthesized and characterized (where P 2 RN2 R′ are substituted 1,5-diaza-3,7-diphosphacyclooctanes). These compounds include [Fe(P 2 PhN2 Ph)(CH3CN) 4](BF4)2 (5), cis-[Fe(P2 PhN2 Ph)2(CH3-CN) 2](BF4)2 (6a), cis-[Fe(P2 PhN2 Bz)2(CH3CN) 2](BF4)2 (6b), cis-[Fe(P2 CyN2 Bz)2(CH3CN) 2](BF4)2 (6c), trans[HFe(P2 PhN2 Ph)2(CH3CN)](BF 4) (7), and cis-Fe(P2 PhN2 Ph)2(Cl)2 (8). The molecular structures of 5, 6b, and 7 have been confirmed by X-ray diffraction studies. For all complexes the cyclic diphosphine ligands contain one six-membered ring in a chair conformation and one six-membered ring in a boat conformation. For complex 7, the two rings that are in boat conformations result in N-H distances between the pendant amine nitrogens and the hydride ligand of 2.6 to 2.7 Å. Protonation of the pendant bases in complex 7 has been found to form several products. A structural assignment for a dominant protonated isomer has been assigned on the basis of 1H, 31P, and 15N NMR spectroscopic techniques.
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U2 - 10.1021/om700601h
DO - 10.1021/om700601h
M3 - Article
VL - 26
SP - 5003
EP - 5009
JO - Organometallics
JF - Organometallics
SN - 0276-7333
IS - 20
ER -