Structure of the monosodium salt of D-glucose 6-hydrogenphosphate

Abstract

Na⁺.C₆H₁₂O ₉P^-, M_r=282.1,monoclinic,P2₁,a=5·762([), b=7·163(2), c=12.313 Å, β=99.97(1)⁰, U=500.5ų ,Z=2,D_m=1.86,D_x=1.87 Mgm^-3,Cu Ka,λ=1.5418Å,μ=3.3mm^-1, F(OOO) = 292, T = 300 K, final R for 922 observed reflections is 0·042. The phosphate ester bond P-O(6), is 1·575 (5) Å, slightly shorter than the P-O bond in monopotassium phosphoenolpyruvate [1.612(6)Å] [Hosur & Viswamitra (1981). Acta Cryst. B37, 839-843]. The pyranose sugar ring takes a ⁴C₁ chair conformation. The conformation about the exocyclic C(5)-C(6) bond is gauche-trans. The endocyclic C-O bonds in the glucose ring are nearly equal with C(5)-O(5) = 1.436(9)Å. The sodium ion has seven near neighbours within a distance of 2·9 Å. The crystal structure is stabilized by hydrogen bonds between the 0 atoms of symmetry­ related molecules.