Supplementary material
Acta Cryst.
(2011). C
67
[
doi:10.1107/S0108270111000023
]
Hexakis(urea-
O
) zinc(II) dinitrate at 110 and 250 K: uniaxial negative thermal expansion
S. Smeets
and
M. Lutz
Interactive version of text figure
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A dynamic representation of the hydrogen bonding in (I
a
) as shown in Fig. 2
.