Glycine

• Formula : $C_2H_5NO_2$
• Space group : $P12_1/n1$, $P2_1/n$, nb 14
  • 1 inversion centre
  • 1 glide plane with normal along b, located at y=1/4 and a diagonal translation 1/2,1/2
  • 1 screw axis along b located x=1/4,z=1/4
• Parameters : $a=4.925A$, $b=11.433A$, $c=5.378A$
• Angles : $\alpha=88.851^{\circ}$, $\beta=111.967^{\circ}$, $\gamma=90.033^{\circ}$

a	b

c	d

A unit cell of alpha_glycine viewed along the a) $\bb a$ axis, b) $\bb b$ axis, c) $\bb c$ axis and in d) 3D view. The multiplicity is 4.

In solid state, glycine is in zwitterionic form with a positive charge at the nitrogen site and a negative charge at the oxygen site.

Frame intensities

a	b

top:excitation error and bottom : experimental intensities. a) Main reflections (maximum intensity above 500). b) Experimental reflection intensities with maximum intensity between 100 and 500

Experimental integrated intensities

a	b

a) Distribution of experimental integrated reflections as function of resolution. b) Average experimental integrated intensity.

a	b

a) beams used for dynamical refinement. b) Fo vs Fc after dynamical refinement.

Bloch wave simulations

a	b	c	d

Rocking curves at a few selected thicknesses for strong reflection a)

a	b