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Figure 1
(a) The room-temperature I2 and (b) the low-temperature Pn21m structure of (I)[link] (view parallel to [100]). All x values of corresponding atoms differ by approximately 0.25 (before and after the transition, see Fig. 4[link]). The two structures differ significantly only in the shaded range (location of one-half of the amide groups). In (b), atom Na2 is positioned exactly behind Na1.

Journal logoSTRUCTURAL
CHEMISTRY
ISSN: 2053-2296
Volume 64| Part 8| July 2008| Pages m300-m304
doi:10.1107/S0108270108022427
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