A catalyst don’t appear in the overall stoichiometry of the reaction it catalyzes, Quality Control of: 9H-Pyrido[2,3-b]indole, but it must appear in at least one of the elementary reactions in the mechanism for the catalyzed reaction. 244-76-8, Name is 9H-Pyrido[2,3-b]indole, molecular formula is C11H8N2. In a Conference Paper, authors is Byeon, Sung Yong，once mentioned of 244-76-8
Blue host materials for phosphorescent organic light-emitting diodes (PHOLEDs) were synthesized with carbazole as a donor moiety and a-carboline as an accepter moiety to assign bipolar property. Synthesized carbazole-carboline core was modified with benzonitrile, phenyl and carbazole to control charge transport property. The host materials showed high triplet energy above 2.85 eV, and their highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital energy levels (LUMO) were -5.90/-2.79, -5.90/-2.72 and -5.89/-2.67 eV, respectively, depending on the substituent of the core structure. Maximum quantum efficiencies of 23.4%, 19.6% and 17.4% were obtained with low driving voltage in blue PHOLEDs using the new host materials.
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Reference：
Indole alkaloid derivatives as building blocks of natural products from Bacillus thuringiensis and Bacillus velezensis and their antibacterial and antifungal activity study,
Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles