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Figure 6
Part of the crystal structure of compound (II)[link], showing the formation of a chain of alternating fumarate ions and fumaric acid mol­ecules. Hydrogen bonds are drawn as dashed lines and, for the sake of clarity, the cations and the H atoms bonded to C atoms have been omitted. The atoms marked with an asterisk (*), a hash (#), a dollar sign ($) or an ampersand (&) are at the symmetry positions (1 − x, 1 − y, 1 − z), (1 − x, −y, 1 − z), (x, 1 + y, z) and (1 − x, 2 − y, 1 − z), respectively. The atoms O21 and O31 (without symmetry symbols) are components of the reference species at (x, y, z).

Journal logoCRYSTALLOGRAPHIC
COMMUNICATIONS
ISSN: 2056-9890
Volume 77| Part 1| January 2021| Pages 34-41
https://doi.org/10.1107/S2056989020015959
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