Synthesis, characterization, and properties of 7,7′-bis(3,6-di-tert-butylcarbazol-N-yl)-substituted fluorenyl-oligothiophenes
摘要:
A series of new 7,7'bis(3,6-di-tert-butylcarbazol-N-yl)-substituted fluorenyl-oligothiophenes bearing 0-, 2-, 4-, 6-, and 8-thiophene rings, namely BCFTn, were synthesized using palladium catalyzed Stille dimerization coupling reactions of their corresponding brominated thiophenes. The relationship between the chemical structure and the properties of these oligomers was evaluated. With respect to the electronic properties, the longest wavelength absorptions, emissions, and also the oxidation potentials can be tuned by varying the conjugation length of the oligothiophene segments. The terminal carbazole and fluorene moieties of the resulting materials are beneficial for their morphology, conjugation length, and solubility. (C) 2012 Published by Elsevier Ltd.
Synthesis and Properties of Ethyl, Propyl, and Butyl Hexa-alkyldisilanes and Tetrakis(tri-alkylsilyl)silanes
作者:Mohammed A. K. Ahmed、David S. Wragg、Ola Nilsen、Helmer Fjellvåg
DOI:10.1002/zaac.201400276
日期:2014.11
unidentified product(s) was obtained. For R = n-propyl a mixture of [(CH3CH2CH)3Si]2 (hexa-n-propyldisilane), [(CH3CH2CH2)2Si]4, (octa-n-propyltetra-cyclo-silane), [(CH3CH2CH2)3Si]4Si tetrakis(tri-n-propylsilyl)silane} (2)], and other unidentified product(s) was obtained. From this mixture only 2, a new and previously unreported compound, was purified. 2 is the second compound of this type to be reported