Abstract
The crystal structure of a 1 : 1 complex of adenin-9-ylethylamine and phenylacetic acid, C7H10N6·C8H8O2, has been determined by the X-ray method. The crystal is orthorhombic, space group P212121, with unit-cell dimensions of a=7.050 (2), b=11.835 (4) and c=18.711 (7) A. The structure was solved by the direct method and refined by the blockdiagonal least-squares method to give a final R value of 0.037. In this complex, a salt bridge exists between the anionic carboxyl group of phenylacetic acid and the cationic amino group of adenin-9-ylethylamine. No specific interaction between the adenine and benzene rings was observed. The component molecules are held together by a three-dimensional framework of hydrogen bonds around the twofold screw axis to form an infinite helical array in the a direction.
