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Crystal structure at 110 K of (R)-1-phenylethylammonium hydrogen maleate-water (1/0.25), and a study of the conformation of 1-phenylethylammonium ions

The title compound crystallizes in the orthorhombic space group C2 with a=39.191, b=5.624, c=11.247A, and β=95.750°, Z=8,. Using 3182 reflections the structure was refined to R=0.027 and R w =0.032. A short asymmetric intramolecular hydrogen bond is observed in both crystallographically independent anions; the two O-O distances are 2.42 and 2.44A. One of the hydrogen maleate ions displays a significant twist of the carboxylic groups relative to the double bond. The two (R)-1-phenylethylammonium ions are virtually identical. The water molecule links one of the cations to one of the anions