Goel A.,Medicinal and Process Chemistry Division |
Goel A.,Academy of Scientific and Innovative Research |
Sharma A.,Medicinal and Process Chemistry Division |
Rawat M.,Indian Institute of Technology Kanpur |
And 2 more authors.
Journal of Organic Chemistry | Year: 2014
A series of fluorescent teraryls and quateraryls were prepared from a ketene-S,S-acetal under mild conditions. These compounds exhibited blue, sky-blue and green color emissions both in the solid state and in a solution with good quantum yields, positive solvatochromic behavior, and reversible oxidation and reduction properties. The electronic characteristics of teraryl 6a and quateraryls 9a,b were examined by time-dependent density functional theory (TDDFT) calculations. Light-emitting devices were fabricated from teraryl 6a and quateraryls 9a,b as dyes and the configuration of ITO/PEDOT:PSS (40 nm)/NPB (20 nm)/ dye (50 nm)/BCP (7 nm)/ LiF (0.7 nm)/Al (200 nm), which exhibited electroluminescence maxima of 455, 480, and 525 nm, respectively. These devices operated at a substantially low turn-on voltage (3 and 4 V) and exhibited maximum luminance efficiencies of 0.62, 0.57, and 1.9 cd/A and brightnesses of 59, 160, and 1284 cd/m2, respectively. © 2014 American Chemical Society.
Samala S.,Medicinal and Process Chemistry Division |
Mandadapu A.K.,Medicinal and Process Chemistry Division |
Saifuddin M.,Medicinal and Process Chemistry Division |
Kundu B.,Medicinal and Process Chemistry Division |
And 2 more authors.
Journal of Organic Chemistry | Year: 2013
A simple and efficient one-pot protocol for the synthesis of NH-carbazoles has been described. The strategy comprises a one-pot reaction involving the treatment of 2-alkynyl indoles with arylacetylenes in the presence of an Au-Ag combination catalyst. The salient feature of the strategy involves sequential activation of terminal and internal alkynes leading to the cascade hydroarylation of terminal alkynes and 6-endo-dig carbocyclization reactions. The generality of the method has been demonstrated by using a series of 2-alkynyl indoles and arylacetylenes. © 2013 American Chemical Society.