Paper
An X-ray Crystallographic Study of the Related Triazenes, 1,4-Di[(E)-2-(2-nitrophenyl)-1-diazenyl]piperazine and Methyl 4-{(E)-2-(4-methylpiperazino)-1-diazenyl}benzoate
Published Apr 9, 2008 · Vanessa Renee Little, H. Jenkins, K. Vaughan
Journal of Chemical Crystallography
13
Citations
0
Influential Citations
Abstract
The crystal structures of methyl 4-{(E)-2-(4-methylpiperazino)-1-diazenyl}benzoate (2a) and 1,4-di[(E)-2-(2-nitrophenyl)-1-diazenyl]piperazine (3a) have been determined by single crystal X-ray diffraction analysis. The bis-triazene (3a) adopts an unusual pseudo-boat conformation in the piperazine ring, with a dihedral angle of 52.20(0.06)° between the two planes defined within the piperazine ring. The crystal structures of 2a and 3a are compared with the structure of the triazene (4) and the closely related bis-triazene (5). The piperazine ring of 2a adopts a typical chair conformation, whereas the piperazine ring of 3a adopts an unusual boat conformation. Crystal data: 2a C13H18N4O2, monoclinic, space group P21/n, a = 13.849(3) Å, b = 6.577(1) Å, c = 14.904(3) Å, α = 90°, β = 96.098(3)°, γ = 90° and V = 1,349.8(4) Å3, for Z = 4. 3a C16H16N8O4, triclinic, space group P-1, a = 7.6066(6) Å, b = 8.3741(7) Å, c = 14.507(1) Å, α = 78.673(1)°, β = 81.877(1)°, γ = 73.445(1)° and V = 865.0(1) Å3, for Z = 2.Index abstract The crystal structures of methyl 4-{(E)-2-(4-methylpiperazino)-1-diazenyl}benzoate (2a) and 1,4-di[(E)-2-(2-nitrophenyl)-1-diazenyl]piperazine (3a) have been determined by single crystal X-ray diffraction analysis.
The crystal structures of methyl 4-(E)-2-(4-methylpiperazino)-1-diazenyl-benzoate (2a) and 1,4-di[(E)-2-(2-nitrophenyl)-1-diazenyl]piperazine (3a
Full text analysis coming soon...