1-[2-(p-Tolyl)-1-diazenyl]-3-({3-[2-(p-tolyl)-1-diazenyl] perhydrobenzo[d]imidazol-1-yl}methyl)perhydrobenzo[d]imidazole: synthesis,characterization and X-ray crystal structure

摘要

1-[2-(p-Tolyl)-1-diazenyl]-3-({3-[2-(p-tolyl)-1-diazenyl]perhydrobenzo[d]imidazol-1-yl}methyl)perhydrobenzo[d]imidazole(1) has been synthesized by reactionof a mixture of 1,2-diaminocyclohexane and formaldehyde withp-toluene diazonium chloride inaqueous solution. The product has been characterized by IR and NMRspectroscopy and elemental analysis. A crystal grown from solution ina mixed solvent system of ethyl acetate and hexanes was analyzed byX-ray crystallography. The solution of the crystal structure of(1) is important in establishing theconnectivity of this molecule and other compounds of similarstructure. The crystal structure of (1) is compared with the previously reportedstructure of the p-cyano analogue(2). Compounds (1) and (2)differ principally in the relative orientation of the heterocyclicrings; in (1), the molecule has adistinct V-shape, whereas compound (2) adopts a more extended conformation.Significant conjugation within the triazene moieties is evident inboth (1) and (2), as manifested in the N465=N andN–N bond lengths. The conjugation is greater in (2) due to the extended conjugation through tothe nitrile group. The title compound (1){C29H40N8}crystallizes in the monoclinic, space group C2/c, with lattice constants: a = 30.532(6) Å,b =5.9050(12) Å, c= 15.463(3) Å, α = 90°,β = 99.94(3)°, γ = 90°,V =2746.0(10) Å3, Z = 4, D c =1.209 mg m−3,F(000) = 1076, R 1 = 0.0785,wR 2= 0.1877.