Crystal structure of DL-alanine nitrate

Abstract

Abstract DL-alanine nitrate (C3H8NO2)+(NO3)−, M = 152.11, monoclinic, P21/c, a = 7.648(1) Å, b = 5.631(1) Å, c = 16.335(3) Å, β = 94.42(1)°, V = 701(1) Å3, Dm = 1.45 (flotation), Dc = 1.44, Z = 4, μ(MoKα ) = 1.3 cm−1, λ(MoKα ) = 0.70926 Å. The crystal structure was solved by direct methods and refined to an R value of 0.062 and wR of 0.063 for 680 unique reflections with I > 3σ(I). The intensity data seem to have suffered from secondary extinction effects. Alanine molecules exist in cationic form with protonation of the carboxylic group. The hydrogen-bonded chains run along the c-direction at x = ¼ and ¾ planes.