X-Ray crystal structure of the dye 4-( N,N-bis-(β-hydroxyethyl) amino) azobenzene

Abstract

The crystal structure of 4-( N, N-bis-(β-hydroxyethyl)amino)azobenzene was determined through the use of X-ray diffractometer data. The structure was solved via direct methods and refined by least squares to R = 0.0594 for a data set consisting of 1610 unique reflections. The azobenzene skeleton of the dye is essentially planar, with a dihedral angle of 10.3° between the planes defined by the two aromatic rings. The geometry about the azo linkage, and some key bond lengths of this dye, are compared to the corresponding values for some previously reported azobenzenes.