CRYSTAL-STRUCTURE OF L-LEUCINE NITRATE

L-leucine nitrate, C6H14NO2+ . NO3-, M = 194.187, triclinic, P1, a = 5.662(6), h = 8.445(4), c = 10.867(6) angstrom, alpha = 75.79(4), beta = 95.45(6), gamma = 99.82(6)-degrees, V = 495.57 angstrom3, D(m) = 1.307 gm/cc (flotation), D(c) = 1.301 gm/cc, Z = 2, mu = 1.06 cm-1, lambda(MoKalpha) = 0.71073 angstrom, F(000) = 208, T = 293 K. The structure was solved by direct, Fourier and difference Fourier methods, refined to R = 0.045 and wR = 0.050 for 1934 observed reflections with intensity greater than 3sigma(I). Since the structure has a pseudo 2(1)-axis parallel to the a-axis, all the hydrogen atoms were located by geometric consideration and fixed at their calculated positions. The pseudo-symmetry is present even at the final stage of refinement. All available hydrogen atoms are involved in hydrogen bonding.