Key points are not available for this paper at this time.
Abstract From the point of view of crystal structure the ordinary form of azobenzene definitely belongs to the dibenzyl series of structures, which have now been accurately determined (Robertson 1934, 1935; Robertson and Woodward 1937, 1938). This isomorphism is in itself sufficient to decide the trans-configuration of the molecule in the ordinary form of azobenzene; but in the meantime the hitherto unknown cis-form has been isolated by Hartley (1938) and an account of its crystal structure given (Robertson 1939). The present paper summarizes the results of a detailed analysis of the trans-form.
Lange et al. (Tue,) studied this question.