Crystal structures of two 1,2-bis-(1-aryl-3-methyltriazene-3-yl-)ethanes with aryl substituents of opposite polarity

The crystal and molecular structure of 1,2-bis-{1-(2-cyanophenyl)-3-methyltriazen-3-yl-}ethane (1) and 1,2-bis-{1-(2-methoxyphenyl)-3-methyltriazen-3-yl-}ethane (2) have been determined by single crystal X-ray diffraction analysis. Bis-triazene (1) exists as the "staggered" conformation in the solid state, with an anti-anti configuration around the N2-N3 bond of the triazene units, whereas 2 assumes a "gauche" conformation with the syn-syn configuration in the triazene units. Crystal data: 1 C₁₈H₁₈N₈, triclinic, space group P - 1, a = 6.108(2), b = 8.118(3), c = 9.600(4)Å, α = 101.37(7)°, β = 96.47(7)°, γ = 102.71(5)°, V = 449.1(3)ų, Z = 2; 2 C₁₈H₂₄N₆O₂, monoclinic, space group P 2₁/n, a = 13.119(5), b = 7.745(2), c = 19.201(2)Å, β = 96.47(7)°, V = 1910.3(9)ų, Z = 4.