𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Complexes of cobalt(III) with d-fructose and phenanthroline

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

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
816 KB
Volume
268
Category
Article
ISSN
0008-6215

No coin nor oath required. For personal study only.

✦ Synopsis

D-Fructose and 1,10-phenanthroline form complexes with Co(III). Configurations about Co(III) are assigned from the CD and ORD spectra of the separated A and A diastereomers, and A strongly predominates in the mixture. Most of the 1H NMR signals of the complexes are shifted strongly upfield, relative to those of D-fructose, due to shielding by aromatic residues, and the effect is especially strong for hydrogens at positions 1 and 6. Signals of the fructose residue are assigned for the A diastereomer and coupling constants estimated, but only some of the signals can be assigned for the A diastereomer. The marked changes in chemical shifts on formation of the complexes from fructose are rationalized in terms of predicted conformations based on molecular-mechanics calculations with MM2 parameters, which predict the higher stability of the A over the A diastereomer, and also complexation at positions 2 and 3.

📜 SIMILAR VOLUMES

Complexes of cobalt(III) with d-glucosam
Complexes of cobalt(III) with d-glucosamine and amines
✍ Sergio Bunel; Carmen Ibarra; Exequiel Moraga; Víctor Calvo; Andrei Blaskó; Cliff 📂 Article 📅 1993 🏛 Elsevier Science 🌐 English ⚖ 712 KB

ABSTRACX o-Gl~amine and ammonia, 1,2\_ethylenediamine, or l,lO-phenanthroline form complexes with Co(IID \*. The complexes are: [Co@IH,)s~H,O .o-glucosamine]3+, [Co(en)Z.o-glucosamine]2' and [Co(phen),.o-glucosamine]'+. Formation of the last two complexes is stereospecific with Co(III), with predom

Complexes of Co(III) with l-sorbose and
Complexes of Co(III) with l-sorbose and phenanthroline
✍ Andrei Blaskó; Clifford A. Bunton; Exequiel Moraga; Sergio Bunel; Carmen Ibarra 📂 Article 📅 1995 🏛 Elsevier Science 🌐 English ⚖ 695 KB

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