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Complexes of Co(III) with l-sorbose and phenanthroline

✍ Scribed by Andrei Blaskó; Clifford A. Bunton; Exequiel Moraga; Sergio Bunel; Carmen Ibarra

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
695 KB
Volume
278
Category
Article
ISSN
0008-6215

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✦ Synopsis

L-Sorbose and two molecules of 1,10-phenanthroline form a complex with Co(III) which has the A configuration about Co(III), based on CD and ORD spectra. The ]H NMR signals of a-L-sorbopyranose and its mixed Co(III)(phen) 2 complex have been assigned. Signals of H-6 and H-6' of the sugar are shifted strongly upfield because of shielding by the aromatic residues, but shifts are much smaller for H-1 and H-I'. These observations are consistent with molecular modelling with MM2 parameters, which predicts that the most stable complex is the A diastereomer with complexation at positions 1 and 2. The characteristics of the NMR spectra and the predicted structure of the complex differ from those of the corresponding complex of D-fructose.

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