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Abstract
The crystal structures of diammonium fumarate, 2NH 4 + .C 4 H 2 O 4 2- , (I), and bis(isopropylammonium) fumarate, 2C 3 H 7 NH 3 + .C 4 H 2 O 4 2- , (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) separated by layers of isopropyl groups. The N...O distances are 2.790 (1)-2.903 (1) A in (I) and 2.747 (1)-2.807(1)A in (II). Differences between the solid-state photoreactivities of the fumaric acid ions in (I) and (II) are rationalized based on the crystal structures.
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