79887-17-5Relevant articles and documents
Alkyloxy modified pyrene fluorophores with tunable photophysical and crystalline properties
Kapf, Andreas,Eslahi, Hassan,Blanke, Meik,Saccone, Marco,Giese, Michael,Albrecht, Marcel
, p. 6361 - 6371 (2019/04/25)
Novel alkyloxy modified 2,7-di-tert-butyl-4,5,9,10-tetra(arylethynyl)pyrenes were prepared through a straightforward Sonogashira coupling approach. Optical properties such as quantum yields and absorption/emission spectra of the fluorophores were investigated by UV/Vis and fluorescence measurements. Aggregation induced excimer formation of the chromophores in polar solvents and in the solid state was proved by the presence of a characteristic bathochromically shifted emission band and a decrease of the emission capability. These results strongly indicate the unexpected observation that the excimer formation of adjacent pyrene rings is not prevented by the introduction of bulky tert-butyl substituents. Single-crystal X-ray and computational analyses reveal the co-planar alignment of adjacent molecules and the presence of π-π-stacking in the molecular packing of the pyrene polyaromatics. Furthermore, fluorescence, DSC and POM measurements indicate that the aggregation behaviour, the thermal characteristics and the crystalline properties are significantly influenced by changing structural features of the attached functional groups at the periphery of the pyrene core.
Ullazine Donor–π bridge-Acceptor Organic Dyes for Dye-Sensitized Solar Cells
Zhang, Yanbing,Cheema, Hammad,McNamara, Louis,Hunt, Leigh Anna,Hammer, Nathan I.,Delcamp, Jared H.
supporting information, p. 5939 - 5949 (2018/03/28)
A series of four ullazine-donor based donor–π bridge-acceptor (D–π–A) dyes have been synthesized and compared to a prior ullazine donor-acceptor (D–A) dye as well as a triphenylamine donor with an identical π–bridge and acceptor. The D–π–A ullazine series demonstrates an unusually uniform-in-intensity panchromatic UV/Vis absorption spectrum throughout the visible region. This is in part due to the introduction of strong high-energy bands through incorporation of the ullazine building block as shown by computational analysis. The dyes were characterized on TiO2 films and in DSC devices. Performances of 5.6 % power conversion efficiency were obtained with IPCE onsets reaching 800 nm.
MACROCYCLIC BROAD SPECTRUM ANTIBIOTICS
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Paragraph 00791; 00899, (2018/09/12)
Provided herein are antibacterial compounds, wherein the compounds in some embodiments have broad spectrum bioactivity. In various embodiments, the compounds act by inhibition of bacterial type 1 signal peptidase (SpsB), an essential protein in bacteria. Pharmaceutical compositions and methods for treatment using the compounds described herein are also provided.