Fakultäten
M. Seitz, A. Kaiser, S. Stempfhuber, M. Zabel, O. Reiser, Inorg. Chem. 2005, 44, 4630-4636
Web edition: http://dx.doi.org/10.1021/ic050014b
New metal complexes with pentagonal-bipyramidal geometry have been synthesized with the chiral, pentadentate bisoxazoline ligand (R,R)-1, including the metal ions magnesium(II), iron(II) and cadmium(II).
M. Seitz, S. Stempfhuber, M. Zabel, M. Schütz, O. Reiser, Angew. Chem. 2005, 117, 246-249; Angew. Chem. Int. Ed. 2005, 44, 242-245
Web edition: http://dx.doi.org/10.1002/anie.200460843
Δ2 or Λ2, this is here the question! Depending on the heteroatom X the pentadentate bis(oxazoline) ligand will fold around a zinc(II) ion exclusively in the Δ2- or Λ2-configuration, both, in solution as well as in the solid state.
M. Seitz, A. Kaiser, S. Stempfhuber, M. Zabel, O. Reiser, J. Am. Chem. Soc. 2004, 126, 11426-11427
Web edition: http://dx.doi.org/10.1021/ja0469784
A chiral, nonracemic pentadentate pyridine bis(oxazoline) ligand forms unprecedented P-helical inorganic organic hybrid polymers with cadmium halides. The one-dimensional chains consist of Λ2-configured pentagonal-bipyramidal cadmium complexes with metal-centered chirality bridged by [CdX4]2- tetrahedra via shared halide atoms. In the solid state, the overalll helicity exhibits strongly directed orientation parallel to the crystallographic axis a.
M. Seitz, A. Kaiser, D.R. Powell, A.S. Borovik, O. Reiser, Adv. Synth. Catal. 2004, 346, 737-741
Web edition: http://dx.doi.org/10.1002/adsc.200404020
The first example of new pentadentate bis(oxazolines) has been synthesized using a modular approach that readily provides access to this ligand class. This ligand allows the controlled transfer of carbon-centered to octahedral, metal-centered chirality, as demonstrated both, in the solid state as well as in solution. The characteristic CD-band has been identified for dicationic, octahedral transition-metal complexes with Δ2-configuration.
Peter Kreitmeier - 28.06.2011 20:00
