An X-ray Crystallographic Study of 1,4-Di((E)-2-(p-tolyl)-1- diazenyl)piperazine

AbstractThe crystal structure of methyl 1,4-di[(E)-2-(p-tolyl)-1-diazenyl]piperazine (4) has been determined by single crystal X-ray diffraction analysis. The bis-triazene (4) adopts a normal chair conformation in the piperazine ring, with puckering parameters : φ 2 = −29(5)°, Q T = 0.534(2) A and θ 2 = 177.0(2)°. The crystal structure of 4 is compared with the structure of the triazene (2a) and the closely related bis-triazenes (3 and 5a). The piperazine ring of 2a and 4 adopt a typical chair conformation, whereas the piperazine ring of 3 adopts an unusual pseudo-boat conformation. Crystal data: 4 C 18 H 22 N 6 , triclinic, space group [FORMULA], a = 6.8925(2) A, b = 7.8574(3) A, c = 16.8856(8) A, α = 103.103(2)°, β = 90.528(2)°, γ = 101.776(2)° and V = 870.44 (6) A 3 , for Z = 2.Graphical AbstractThe crystal structure of 1,4-di[(E)-2-(p-tolyl)-1-diazenyl]piperazine has been determined by single crystal X-ray diffraction analysis[IMAGE]