Douglas W. Hammerstroem, J. Braddock-Wilking, N. Rath
Feb 15, 2017
Citations
1
Influential Citations
8
Citations
Journal
Journal of Organometallic Chemistry
Abstract
Abstract A series of six luminescent 2,7-alkynyl(aryl)-3,6-dimethoxy-9,9-diphenylgermafluorenes were synthesized from the corresponding 2,7-dibromo-3,6-dimethoxy-9,9-diphenylgermafluorene utilizing a palladium-catalyzed Sonogashira cross-coupling reaction to incorporate different alkynyl(aryl) groups at the 2,7-positions of the germafluorene ring. The new germafluorenes show an intense absorption band centered between 371 and 388 nm and moderate to strong emission in solution between 401 and 443 nm (ΦF = 0.65–0.83) as well as emission from the solid-state. Germafluorenes 4a–4f were characterized by multinuclear 1H and 13C{1H} NMR, EA, DSC, TGA, UV–Vis, and fluorescence spectroscopy. TGA and DSC studies of germafluorenes 4a–4f showed high thermal stability. The molecular structures of four of the germafluorenes, 4c–4f were determined by X-ray crystallography.