601454-30-2

Upstream product

• 110677-45-7 N-(4-formylphenyl)carbazole 

Downstream Products

• 1221728-45-5 4-[3,6-bis(phenylethynyl)-9H-carbazol-9-yl]benzaldehyde 
• 1221728-44-4 4-[3,6-bis[[4-(dimethylamino)phenyl]ethynyl]-9H-carbazol-9-yl]benzaldehyde 

Relevant academic research and scientific papers

meso-borneol- andmeso-carbazole-substituted porphyrins: multifunctional chromophores with tunable electronic structures and antitumor activities

Herein, a series of fiveC2symmetric H2porphyrins withmeso-borneol andmeso-carbazole units have been synthesized and isolated. An analysis of the electronic structures was carried out by spectroscopic investigations and electrochemica

Tuning the HOMO energy levels of organic dyes for dye-sensitized solar cells based on Br-/Br3- electrolytes

A series of novel metal-free organic dyes TC301-TC310 with relatively high HOMO levels were synthesized and applied in dye-sensitized solar cells (DSCs) based on electrolytes that contain Br-/Br3- and I-/I3-. The effects of additive Li+ ions and the HOMO levels of the dyes have an important influence on properties of the dyes and performance of DSCs. The addition of Li+ ions in electrolytes can broaden the absorption spectra of the dyes on TiO2 films and shift both the LUMO levels of the dyes and the conduction band of TiO2, thus leading to the increase of Jsc and the decrease of Voc. Upon using Br-/Br3- instead of I-/I3-, a large increase of Voc is attributed to the enlarged energy difference between the redox potentials of electrolyte and the Fermi level of TiO2, as well as the suppressed electron recombination. Incident photon to current efficiency (IPCE) action spectra, electrochemical impedance spectra, and nanosecond laser transient absorption reveal that both the electron collection yields and the dye regeneration yields (Φr) depend on the potential difference (the driving forces) between the oxidized dyes and the Br-/Br 3- redox couple. For the dyes for which the HOMO levels are more positive than the redox potential of Br-/Br3 - sufficient driving forces lead to the longer effective electron-diffusion lengths and almost the same efficient dye regenerations, whereas for the dyes for which the HOMO levels are similar to the redox potential of Br-/Br3-, insufficient driving forces lead to shorter effective electron-diffusion lengths and inefficient dye regenerations. A new middleman: The Br-/Br3- redox mediator was proved to be a promising alternative to I-/I 3- for application in dye-sensitized solar cells (see graphic). Studies show that the energy gap between the HOMO level of the dye and the potential of the Br-/Br3- redox mediator influences their charge-transfer processes and solar-energy conversion efficiency.

Rigid dendritic gelators based on oligocarbazoles

The first rigid dendritic gel with strong emission based on oligocarbazole was reported. It is interesting that the second generation of dendron exhibited gelation ability under ultrasound, and two-component gel could be formed from the first generation o

Effect of the electron donor/acceptor orientation on the fluorescence transduction efficiency of the d-pet effect of carbazole-based fluorescent boronic acid sensors

We have synthesized three new carbazole-based fluorescent boronic acid sensors to investigate the fluorescence transduction efficiency of the novel d-PET effect, in which the fluorophore acts as the electron donor and the protonated amine/boronic acid group as the electron acceptor of the photoinduced electron transfer process (PET). Aryl ethynyl groups are attached at the 3,6-position of carbazole (aryl = 4-dimethylaminophenyl for sensor 1 or phenyl for sensor 2). Sensor 3 is without 3,6-substitutions. The phenylboronic acid moiety is attached at the 9-position (N-atom) of the carbazole in these sensors. We found that 1 and 3 are d-PET sensors (fluorophore as the electron donor, supported by DFT/TDDFT calculations), which show diminished emission at acidic pH but intensified emission at neutral/basic pH, which is in stark contrast to the normal a-PET (fluorophore as the electron acceptor) sensors, e.g., 2, which shows intensified emission at acidic pH but diminished emission at neutral pH. The fluorescence modulation efficiency of the d-PET effect of the new sensors, i.e., the emission intensity enhancement upon switching from acidic pH to neutral pH, is up to 10-fold, which is greatly improved compared to our previous d-PET sensors (ca. 3-fold). The efficient d-PET effect of the new sensors is attributed to the proper orientation of the electron donor/acceptor; i.e., the dipole moment and the transition moment (the direction of PET) of the new sensors are oriented in the same direction, and the dipole moment values of the new sensors along the vector direction of the PET are larger than that of the reported d-PET sensors. Selective recognition of α-hydroxyl carboxylic acids, such as tartaric acid, was achieved with the d-PET sensors, and a novel fluorescence transduction profile of enhancement/ diminishment for chemoselectivity was observed. Herein we propose that the orientation of the electron donor/acceptor may significantly affect the fluorescence modulation efficiency of the PET effect; this discovery will be important for the future design of PET sensors with improved fluorescence transduction efficiencies.

Synthesis and characterization of subporphyrins with dendritic carbazole arms

A series of novel dendritic carbazole-functionalized subporphyrins, T(Cz-Gn)SubPs (n = 1-3), have been synthesized from pyridine-tri(pyrrol-1-yl) borane and the corresponding aldehydes. This study has demonstrated that intramolecular energy transfer from