Abstract
Nickel(ii) complexes prepared from d- and l-arabinose (d-ara and l-ara) and 1,2-diaminoethane (en), [Ni(en-d-ara)2](ClO4)2•2H2O 1 and [Ni(en-l-ara)2](ClO4)2•2H2O 2 (where en-d-ara is 1-((2-aminoethyl)amino)-1-deoxy-d-arabinose) were synthesized and characterized by absorption spectroscopy, circular dichroism (CD), and X-ray crystallography. The CD spectra of 1 and 2 in the d–d transition region indicate a C2 chiral configuration around the metal centre. X-ray crystallography of 1 revealed that two 1-((2-aminoethyl)amino)-1-deoxy-d-arabinose ligands coordinate to the nickel atom in nearly C2 symmetry, through the C(2) hydroxy group of the arabinose moiety and two nitrogen atoms of the diamine in a meridional mode. This results in a Λ-C2-helical configuration around the metal centre. The arabinose ring adopts the rare α-1C4 chair conformation and the carbohydrate–chelate ring conformation is δ.
Original language | English |
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Pages (from-to) | 265-268 |
Number of pages | 4 |
Journal | Australian Journal of Chemistry |
Volume | 62 |
Issue number | 3 |
Publication status | Published - 2009 |
Keywords
- biomolecules
- carbohydrates
- conformation
- glycosides
- nickel
- transition metal complexes