Effect of pressure on the crystal structure of l-serine-I and the crystal structure of l-serine-II at 5.4 GPa

Moggach, S.A.; Allan, D.R.; Morrison, C.A.; Parsons, S.; Sawyer, L.

doi:10.1107/S0108768104031787

Acta Crystallographica Section B
Acta Crystallographica
Section B STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS

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Figure 6
Space-filling plots showing R-type graph sets which occur in L-serine phases I and II as a function of pressure. The top, middle and bottom rows correspond to the L-serine-I at ambient pressure, L-serine-I at 4.8 GPa and L-serine-II at 5.4 GPa, respectively. On the left of the diagram (a), (d) and (g) are all R₃³(11) motifs which occur in the A-layers (cf. Fig. 1

); the hole in this small ring does not become very much smaller with increasing pressure. In the middle column of the diagram (b) and (e) show R³₃(13) motifs, which also occur in the A-layers (cf. Fig. 1

). Note that the hole in the middle of the ring is significantly smaller at 4.8 GPa than at ambient pressure. At 5.4 GPa (h) the R³₃(13) motif of form I has been converted into R²₃(13) in form II. On the right of the figure (c), (f) and (i) show the R³₄(14) rings. Although the hole in the middle of this ring does not close-up in form I between ambient (c) and 4.8 GPa (f), it does in L-serine-II at 5.4 GPa (i).

STRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS

ISSN: 2052-5206

Volume 61| Part 1| January 2005| Pages 58-68

doi:10.1107/S0108768104031787

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