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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
Author(s) -
Berkessel Albrecht,
Seidel Lutz,
Bats Jan W.,
Bolte Michael,
Neumann Thomas
Publication year - 1997
Publication title -
chemische berichte
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 0009-2940
DOI - 10.1002/cber.19971300713
Subject(s) - chemistry , racemization , octahedron , ligand (biochemistry) , nickel , crystallography , crystallization , metal , stereochemistry , coordination complex , crystal structure , organic chemistry , biochemistry , receptor
The complexation behavior of three chiral, tripodal N,O,S‐ligands with nickel(II) 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‐ligand, a metal induced racemization was unveiled which would have otherwise remained undetected.