1247053-58-2

Upstream product

• 626-05-1 2,6-Dibromopyridine 
• 98-80-6 phenylboronic acid 
• 39774-26-0 2-bromo-6-phenylpyridine 
• 60511-85-5 11,12-dihydroindolo[2,3-a]carbazole 

Relevant academic research and scientific papers

Synthesis, Structure, and Chiroptical Properties of Indolo- and Pyridopyrrolo-Carbazole-Based C2-Symmetric Azahelicenes

Treatment of 11,12-bis(1,1’-biphenyl-3-yl or 6-phenylpyridin-2-yl)-substituted 11,12-dihydro-indolo[2,3-a]carbazole with an oxidizing system of Pd(II)/Ag(I) induced effective double dehydrogenative cyclization to afford the corresponding π-extended azahelicenes. The optical resolutions were readily achieved by a preparative chiral HPLC. It was found that the pyridopyrrolo-carbazole-based azahelicene that contains four nitrogen atoms exhibits ca. 6 times larger dissymmetry factors both in circularly dichroism (CD) and circularly polarized luminescence (CPL), |gCD| and |gCPL| values being 1.1×10?2 and 4.4×10?3, respectively, as compared with the parent indolocarbazole-based azahelicene. Theoretical calculations at the RI-CC2 level were employed to rationalize the observed enhanced chiroptical responses. The (chir)optical properties of the former helicene was further tuned by a protonation leading to remarkable red-shift with a considerable enhancement of the |gCPL| value.

MATERIAL FOR USE IN PHOSPHORESCENT DEVICE AND ORGANIC ELECTROLUMINESCENT DEVICE USING SAME

Provided is an organic electroluminescent device (organic EL device), in which the luminous efficiency of the device is improved, driving stability is sufficiently ensured, and the construction of the device is simple. This organic EL device is an organic electroluminescent device, including a light-emitting layer between an anode and a cathode laminated on a substrate, in which the light-emitting layer contains a phosphorescent light-emitting dopant and an indolocarbazole compound as a host material. Examples of the indolocarbazole compound include a compound represented by the following formula (1). It should be noted that in the formulae: a ring A and a ring B are represented by the formulae (1a) and (1b), respectively; Ar's each represent an aromatic hydrocarbon group or an aromatic heterocyclic group; R's each represent a hydrogen atom, an alkyl group, or a cycloalkyl group; X represents a methine group or a nitrogen atom; A represents an aromatic hydrocarbon group, an alkyl group, a cycloalkyl group, or a group represented by the formula (1c); and n represents 0 or 1.