Sinusoidal ribbon waves in the crystal structure of bis(4-aminophenyl)disulfide

The crystal structure of the compound bis(4-aminophenyl)disulfide was determined by single crystal X-ray crystallography. The S-S distance is 2.074(1) Angstrom, and the S-S-C angles are 104.5(1) and 104.7(1)degrees, respectively. The C-SS-C torsion angle is 80.2(1)degrees. In the crystal structure, the disulfide molecules are connected head-to-tail by weak N-H ... N hydrogen bonding to form a polymeric chain and two such strands are linked by N-H ... S bonding (S ... H distance, 2.79(2) Angstrom) to look like sinusoidal ribbon waves when viewed down the c-axis. The N ... N and N ... H distances are 3.160(4) and 2.36(2) Angstrom, respectively. (C) 1998 Elsevier Science Ltd.