Nickel(II) complexes with Schiff-base ligands derived from epimeric pyranose backbones as 2,3-chelators: modeling the coordination chemistry of chitosan.

@article{Burkhardt2008NickelIICW,
  title={Nickel(II) complexes with Schiff-base ligands derived from epimeric pyranose backbones as 2,3-chelators: modeling the coordination chemistry of chitosan.},
  author={Anja Burkhardt and Helmar Görls and Winfried Plass},
  journal={Carbohydrate research},
  year={2008},
  volume={343 7},
  pages={
          1266-77
        }
}
Two mononuclear nickel(II) complexes with Schiff-base ligands derived from the epimeric sugars glucosamine and mannosamine have been synthesized. The X-ray crystal structure reveals a distorted octahedral geometry at the nickel(II) ions with an N4O2 donor set and the rare 2,3-chelation of the donor atoms of the carbohydrate backbone. Upon complexation only the glucopyranose ring maintains the 4C1 chair conformation, whereas the mannopyranose ring adopts the OS5 screw-boat conformation. Dimeric… CONTINUE READING