The stable crystalline form ofp-azoxyanisole is assigned to space group P21/a (C~h) with four molecules in the unit cell having parameters a= 15-776, b= 8.112, e= 11-018 A and b'= 114"57 °. The crystal structure was refined by full-matrix least-squares to a final R value of 0.091 using 2507 reflections measured with a manually operated single-crystal diffractometer. The molecules are arranged in the unit cell with their long axes approximately perpendicular to the (100) plane. The angle between the normals to the two benzene rings is 22.6 °, and the -N=N- bond conformation departs from the planar trans position by approximately 4"2 °.
Krigbaum, W. R.; Chatani, Yozo; and Barber, Patrick G., "The Crystal Structure of p-Azoxyanisole" (1970). Chemistry and Physics Faculty Publications. 7.
Acta Cryst. (1970). B26, 97