Nickel(II) Complexes of Chiral Tripodal N,O,S-Ligands: Square-Planar vs. pseudo-Octahedral Coordination in the Solid State and in Solution, Metal-Induced Racemization of the Ligand
✍ Scribed by Berkessel, Albrecht ;Seidel, Lutz ;Bats, Jan W. ;Bolte, Michael ;Neumann, Thomas
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1997
- Tongue
- English
- Weight
- 683 KB
- Volume
- 130
- Category
- Article
- ISSN
- 0009-2940
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✦ Synopsis
The complexation behavior of three chiral, tripodal N,O,Sligands with nickel(I1) salts was examined. It was found that the coordination mode of the ligands (bidentate N,O and N,S; tridentate N,O,S) and of the central nickel ion (square-planar vs. pseudo-octahedral) is not simply an intrinsic property of the ligand-metal combination, but also a function of the counter ions and of the solvent of crystallization. In the case of one ligand, a diamagnetic square-planar and a paramagnetic pseudo-octahedral form could be switched back and forth, by just changing the solvent of crystallization from methanol to ethanol. By using an enantiomerically pure tripodal N,O,S-Bgand, a metal induced racemization was unveiled which would have otherwise remained undetected.