Synthesis, spectral characterization and crystal structure of 4-(4,5-dicyano-1-H-imidazolyazo)-N,N-diethylaniline

The synthesis, crystal structure analysis and characterization of 4-(4,5-dicyano-1-H-imidazolyazo)-N,N-diethylaniline (C15H15N7, DIAA) were reported. Both the effects of pH value and solvent polarity upon the absorption properties of the compound were presented. The compound DIAA is monoclinic in C2/c with a = 20.793(4) Å, b = 14.008(3) Å, c = 15.771(3) Å, β = 102.79(3)°, V = 4479.6(15) Å3, Dcalc = 1.143 g/cm3 and Z = 8. Crystal stacking scheme indicates the hydrogen bonds and intermolecular π⋯π stacking interactions; the azo molecules arrange in a head-to-tail fashion along the ac plane due to the strong ‘push–pull’ electron system.