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The crystal structures of diammonium fumarate, 2NH4+.C4H2O42−, (I) and bis(isopropylammonium) fumarate, 2C3H7NH3+.C4H2O42−, (II), have been determined. The intermolecular N-H...O hydrogen bonds form a three-dimensional network in (I), whereas two-dimensional sheets are formed in (II) and separated by layers of isopropyl groups. The N...O distances are 2.790 (1)–2.903 (1) Å in (I) and 2.747 (1)–2.807 (1) Å in (II). Differences between the solid-state photoreactivities of the fumaric acid ions in (I) and (II) are rationalized based on the crystal structures.

Supporting information

cif

Crystallographic Information File (CIF)
Contains datablocks global, I, II

hkl

Structure factor file (CIF format)
Contains datablock I

hkl

Structure factor file (CIF format)
Contains datablock II

CCDC references: 129807; 129808

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