Interactions of calcium nitrate with pyranosides in water: a 13C NMR study

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
Kelei ZhuoJianji Wang

Abstract

The 13C NMR spectra of methyl alpha- and beta-D-galactopyranosides, and methyl alpha- and beta-D-glucopyranosides were recorded and show that the Delta(deltaC-4) values for methyl alpha- and beta-D-galactopyranosides increase most rapidly, whereas those for methyl alpha- and beta-D-glucopyranosides vary hardly with increasing molality of calcium nitrate. It can be concluded that ax-OH-4 interacts more strongly with Ca2+ than eq-OH-4 group, namely, the Ca2+ ion interaction with ax-OH-4 leads to a stronger deshielding of the C-4 atom. Compared with other C atoms, the chemical shifts of both C-1 and C-5 atoms in these two types of glycosides decrease relatively rapidly as molality of calcium nitrate increases, indicating that the nitrate ion attractions for these glycosides cause a relatively strong enhancing shielding effect of C-1 and C-5 atoms.

References

Sep 5, 1989·Biochemistry·G K FarberG A Petsko
May 3, 2005·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Pedro OrtizEdilso Reguera

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