Bibliographic Details
| Title: |
Nickel(II) complexes with Schiff-base ligands derived from epimeric pyranose backbones as 2,3-chelators: modeling the coordination chemistry of chitosan |
| Authors: |
Burkhardt, Anja1, Görls, Helmar1, Plass, Winfried sekr.plass@uni-jena.de |
| Source: |
Carbohydrate Research. May2008, Vol. 343 Issue 7, p1266-1277. 12p. |
| Subjects: |
Ligands (Biochemistry), Physical & theoretical chemistry, Organic compounds, Glucosamine |
| Abstract: |
Abstract: 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 4 C 1 chair conformation, whereas the mannopyranose ring adopts the O S 5 screw-boat conformation. Dimeric units of complex cations are formed by intermolecular hydrogen bonding which are further assembled by π-stacking affording one-dimensional chains with a twofold screw symmetry. [Copyright &y& Elsevier] |
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| Database: |
Engineering Source |
