A novel triphenylamine derivative, 2-（4-aminophenyl）-3-（4-（diphenylamino）phen- yl） acrylonitrile （L）, was synthesized and characterized by NMR spectra and X-ray diffraction analysis. Compound L crystallizes in monoclinic, space group P21/n with a = 17.120（12）, b = 6.753（5）, c = 20.380（15） A, β = 113.043（8）°, Mr = 387.47, V= 2168（3）A3, Z= 4, Dc = 1.187 g/cm3, μ = 0.071 mm-1, F（000） = 816, R = 0.0475 and wR = 0.1410 for 16102 observed reflections （I 〉 2σ（I））. In the crystal structure, compound L was found to form antiparallel dimer stacks due to its specific intermolecular interactions, including C-H...N and N-H...π interactions. Fluorescence and thermal studies indicate that compound L has good optical properties and thermal stability.
Indolocarbazole derivatives have been reported to be promising organic semicon- ductor candidates and electroluminescent （EL） materials. One novel indolocarbazole derivative, 2,8-acetyl-5,11-dihexyl-6,12-（di-p-tolyl）-5,11-indolo[3,2-b]carbazole （YK4）, has been synthesized, and its crystal structure has also been carefully studied. YK4 is triclinic, space groups Pi with a = 9.409（5）, b = 13.974（5）, c = 15.488（5） A, α = 90.281（5）, β = 105.456（5）, Z= 93.728（5）°, M,. = 688.94, V= 1958.1（14） A3, Z = 2, Dc.= 1.168 g/cm-3,μ = 0.070 mm-1, F（000） = 740, Rint = 0.0475, R （I〉 20（/）） = 0.1146, wR （I〉 20（/）） = 0.2186, R（all data） = 0.2192 and wR （all data） = 0.2701. Like other indolo[3, 2-b]carbazole derivatives which were introduced in the 5- and 11-positions, the intermolecular short contacts are localized between the pendant groups and acetyl groups of the neighboring indolocarbazole molecules. The molecule of YK4 possesses poor face-to-face π-π stacking between two adjacent molecules in the crystal. The calculated bond lengths and bond angles of YK4 also proved the result of crystallography.
