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.
In this study,linear absorption,single-photon excited fluorescence,fluorescence quantum yields,fluorescence lifetime and two-photon excited fluorescence of a series of triphenylamine derivatives (L1,L2,L3 and L4) have been measured.L1 and L3 are D--A type dyes,while L2 and L4 are D--D--A type dyes (D=donor,A=acceptor).The investigated compounds consist of triphenylamine-bearing donor-substituted and/or systematically extended-conjugated length,which are designed to gain insight into the effect of the ethoxyl unit and-linkage length on the linear and nonlinear optical properties.The influence of solvent polarity on the photophysical properties was investigated.Employing time-dependent density functional theory (TD-DFT) calculations,the structure-property relationships are discussed.
A novel pyridine-contained a-cyanostilbenzene Schiff base, （Z）-3-（4-butoxy- phenyl）-2-（4-（（E）-pyridin-2-yl-methyleneamino）phenyl）acrylonitrile （L）, has been synthesized and characterized by 1H NMR, 13C NMR, FT-IR spectra and single-crystal X-ray diffraction. Single-crystal data show that compound L belongs to the triclinic system, space group P1, with a = 8.759（4）, b = 10.779（4）, c = 12.594（5） A, a= 65.873（4）, β = 88.332（5）, 7= 73.800（5）°, M,. = 381.46, V= 1037.2（7） A3, Z = 2, Dc = 1.221 g/cm-3,μ = 0.076 mm-1, F（000） = 404, gint = 0.0311, R （I〉 20（I）） = 0.0484, wR （I 〉 20（I）） = 0.1544, R （all data） = 0.0484, wR （all data） = 0.1692, completeness to theta = 25.000 being 99.0% and GOF = 1.179. There are two kinds of intermolecular hydrogen bonds and one kind of C-H……π weak interaction between adjacent molecules. Compound L can be used as a candidate for desirable devices with high performance due to its good thermal stability and excellent optical performance.
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.
A novel carbazole quaternary ammonium compound（abbreviated as T_2） had been synthesized and characterized by ~1H NMR, ^（13）C NMR and Mass spectrometry. The single-crystal structure has been determined by X-ray single-crystal diffraction. The electrochemical and two-photon absorption properties of T_2 were systematically studied by cyclic voltammetry and Z-scan determination methods, respectively. The results suggested that T_2 had a good oxidation-reduction and excellent nonlinear optical property. The two-photon absorption（TPA） value has a maximum corresponding to cross section σ = 7963.3 GM（Goeppert-Mayer units） at 700 nm, indicating potential applications in nonlinear optical materials. Furthermore, attributing to the excellent water solubility and low cytotoxicity, the compound was explored on its primary application in biological imaging.
Researches on a-cyanostilbene derivatives demonstrated them to be promising AIE or AIEE structural molecules and potential photoelectric materials. One novel a-cyanostilbene derivative, namely （E）-2-（4-butoxyphenyl）-3-（4-（diethylamino）phenyl）acrylonitrile （BPDPA）, has been designed, synthesized and characterized. The crystalline structure of BPDPA has been studied in detail. The single-crystal X-ray diffraction revealed BPDPA crystallizes in triclinic space group Pi, with a = 12.860（5）, b = 13.327（5）, c = 15.016（5）А, a = 72.650（5）, β = 66.969（5）, Y = 62.897（5）°, Mr = 696.95, V= 2085.6（13） A3, Z = 2, Dc = 1.110 g/cm-3, p = 0.068 mm1, F（000） = 752, Rint = 0.0264, R（I〉 2σ（/）） = 0.0649, wR（l〉 2σ（/） = 0.1724, R（all data） = 0.1321, wR （all data） = 0.2158, completeness to theta = 25.00 is 99.4% and GOF = 1.067. Like most reported a-cyanostilbene derivatives, BPDPA possesses a somewhat twisted molecular structure. UV-Vis and FL measurements showed an obviously bathochromic effect of BPDPA with increasing the polarity of the solvents.
