Asymmetric synthesis of chiral-at-metal complexes with pentadentate bis(oxazoline) ligands

Michael Seitz
2005
A number of novel chiral, pentadentate bis(oxazoline)-pyridine-ligands and the corresponding metal complexes were synthesized. Especially the mononuclear complexes of late transition metals (Mn-Zn) were analyzed with respect to their structures in the solid and the solution state by e.g. NMR-, UV- and CD-spectroscopy. Complex formation proved to be highly diastereoselective in almost every case with regard to the configuration at the stereogenic metal center. A number of coordination geometries
more » ... could be observed, e.g. trigonal-bipyramidal, octahedral and pentagonal-bipyramidal. On the basis of CD-spectroscopy it was possible to establish a predictive model for both coordination geometry and absolute configuration at the metal center of unknown metal complexes in solution. Besides the mononuclear complexes, polynuclear cadmium-compounds could be characterized in the solid state, constituting one of the first examples of one-dimensional, homochiral helices with exclusively bridging halogens (Cl, Br).
doi:10.5283/epub.10273 fatcat:wvyvl6cyqfcj5niz3bpx7deplm