Hexa­kis­(urea-κO)zinc(II) dinitrate at 110 and 250 K: uniaxial negative thermal expansion

Smeets, S.; Lutz, M.

doi:10.1107/S0108270111000023

Acta Crystallographica Section C
Acta Crystallographica
Section C STRUCTURAL CHEMISTRY

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Figure 2
A schematic representation of the hydrogen bonding in (Ia). Dashed lines indicate intermolecular hydrogen bonds. Each colour represents a different set of symmetry operations, i.e. darkest grey (red in the electronic version of the paper): (x, y, z) and (−x, y, −z + $[{1\over 2}]$ ); second-darkest grey (green): (−x + $[{1\over 2}]$ , −y + $[{1\over 2}]$ , −z) and (x + $[{1\over 2}]$ , −y + $[{1\over 2}]$ , z − $[{1\over 2}]$ ); second-lightest grey (orange): (x + $[{1\over 2}]$ , y + $[{1\over 2}]$ , z) and (−x + $[{1\over 2}]$ , y + $[{1\over 2}]$ , −z + $[{1\over 2}]$ ); lightest grey (pink): (−x, −y, −z) and (x, −y, z − $[{1\over 2}]$ ). Nitrates are shown in blue. The view is along the crystallographic c axis. (A dynamic version of this figure can be found in the Supplementary material for this paper.)

STRUCTURAL
CHEMISTRY

ISSN: 2053-2296

Volume 67| Part 2| January 2011| Pages m50-m55

doi:10.1107/S0108270111000023

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