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Figure 10
Butane-1,4-diammonium dibromide polymorph found by USPEX (space group: P21/c, Z = 2). (a) Representation of the network, with a view from the a axis; (b) Br coordination environment, with a view from the b axis. For clarity, H atoms are not shown in (b). The C4H14N22+ molecular ion has six flexible angles, and the unit cell of the stable polymorph contains 44 atoms.

Journal logoSTRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS
ISSN: 2052-5206
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