6,12-Bis(hex-yloxy)-5H,11H-indolo[3,2-b]carbazole.

The title compound, C30H36N2O2, was prepared in a twofold Cadogan cyclization. The mol-ecule is located about a center of inversion. The indolocarbazole skeleton is essentially planar [maximum deviation = 0.028 (2) Å], the C-N bond lengths are nearly identical and the C-C bond lengths of the pyrrole unit are significantly longer than those of the benzene subunits.

5,11-Dimethyl-6,12-dimeth-oxy-indolo[3,2-b]carbazole.

The title compound, C(22)H(20)N(2)O(2), was prepared in a twofold Cadogan cyclization followed by double N-methyl-ation. The crystal structure is characterized by a zigzag arrangement of centrosymmetric mol-ecules. The indolocarbazole framework is essentially planar [maximum deviation = 0.028 (2) Å] and the meth-oxy groups are orthogonal to this plane [C-C-O-C torsion angle = -88.2 (2)°]. The lengths of the C-N bonds are nearly identical and all C-C bonds of the pyrrole subunit are significantly longer than the C-C bonds in the benzene rings.

1,4-Dihex-yloxy-2,5-bis-(2-nitro-phen-yl)benzene.

The title compound, C(30)H(36)N(2)O(6), was prepared via twofold Suzuki coupling of a diboronic acid with bromo-nitro-benzene. The mol-ecule is located on a crystallographic inversion centre. The lateral benzene ring and the central ring make a dihedral angle of 48.75 (14)° and the nitro group is twisted by 41.47 (13)° out of the plane of the benzene ring. The nitro and hex-yloxy groups are in close proximity and the hex-yloxy chain adopts an all-anti conformation.

2,7-Bis(2-nitro-phen-yl)-9-octyl-9H-carbazole.

The title compound, C(32)H(31)N(3)O(4), was obtained in a Suzuki coupling of carbazole diboronic acid and bromo-nitro-benzene. In the crystal, the mol-ecule adopts a non-symmetric conformation. The carbazole ring system is approximately planar [maximum deviation from the least-squares plane = 0.039 (2) Å]. The planes of the carbazole unit and the benzene rings subtend dihedral angles of 48.42 (7) and 41.81 (6)°. The dihedral angles between the planes of the nitro-phenyl rings and the nitro groups are 44.34 (19) and 61.64 (15)°. The crystal is built from two strands of parallel mol-ecules with inter-digitated octyl chains. These strands are symmetry related by a twofold screw axis.