The J-like structures of azobenzene-containing amphiphiles, C10AzoC5N+Br- and C8AzoC5N+Br-.

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Totally synthetic azobenzene-containing amphiphiles C10AzoC5N+Br− and C8AzoC5N+Br− (C31H50N3O3Br and C29H46N3O3Br respectively) were crystallized from their solutions by the solvent-evaporation method. Both crystals are triclinic, with the space group of P\bar1 and Z=2. The unit cell dimensions of the former crystal are a=3.233(5), b=0.854(2), c=0.608(1) nm, α=106.96(8), β=86.6(1), and γ=88.3(1)°. Those of the latter crystal are a=3.0098(6), b=0.8553(2), c=0.6084(1) nm, α=72.99(1), β=92.57(2), and γ=95.64(2)°. The crystal structure of C10AzoC5N+B− was solved by the direct method and refined by the block-diagonal least-squares method: R=0.082 for 2927 observed reflections (2θ<120°, Cu Kα, λ=0.15418 nm). On the other hand, that of C8AzoC5N+Br− was refined by the full-matrix least-squares method: R=0.058 for 2993 reflections (2θ<120°, Cu Kα). The molecular and crystal structures of these compounds are quite similar to those of the homologous compounds, C12AzoC5N+Br− and C6AzoC5N+Br−. That is, the CnAzoC5N+Br− molecules incline about 30° to the bilayer surface to pack in a tail-to-tail fashion. The azobenzene chromophore has a pronounced planarity which makes possible the parallel stacking of adjacent phenyl groups.
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