The Structure around the Nitrite Ion in Concentrated Aqueous Solutions

Abstract

Abstract The hydration structure and intra-ionic geometry of NO2− in a 10 mol% NaNO2 solution in D2O have been determined by the time-of-flight neutron diffraction. Measurements were made with two solutions which are identical in all respects except for the isotopic substitution of nitrogen atom. It appears that there exist 3.7 ± 0.5 water molecules coordinated to NO2− with the intermolecular distance r(N···D) = 2.71 ± 0.02 Å. The intramolecular bond distance rNO and the root mean square amplitude lNO in NO2− have precisely been determined.