Crystallochromy
WebJun 21, 2011 · Tetracene octaesters, which were prepared by twofold [2+2+2] cocyclization, were isolated as red, orange, and orange-yellow solids for the methyl, ethyl, and propyl ester derivatives, respectively.... WebMar 1, 2024 · Cromology’s Brands. Cromology brings together almost thirty brands, about twenty of which benefit of a strong awareness in their respective countries. All Brands. …
Crystallochromy
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WebOct 25, 2016 · This factor may be attributed to the crystal structure of the pigments because it has been shown that visible reflectance (color) of perylene pigments is related to the crystal structure and their subsequent intermolecular interactions. 16 This property is known as crystallochromy and is well investigated in perylene pigments. 16, 17 However, to … WebMay 17, 2010 · The photophysical properties exhibit crystallochromy ranging from yellow to red and different fluorescence quantum yields depending on the length of the alkyl side chain. The isopropyl derivative achieved the highest quantum yield ever reported among tetracenes. Details are discussed in the article by C. Kitamura et al. on p. 3033 ff.
WebOct 1, 1994 · A Theoretical Study of Crystallochromy. Quantum Interference Effects in the Spectra of Perylene Pigments Journal of the American Chemical Society … WebApr 1, 2011 · Crystallochromy in perylene pigments has already been investigated [22, 23]. Slight changes in the molecule structure can lead to a great change in the visual …
WebJan 4, 2011 · ChemInform Abstract: Octaalkyl Tetracene‐1,2,3,4,7,8,9,10‐octacarboxylates: Synthesis by Twofold [2 + 2 + 2] Cocyclization and Crystallochromy. WebJan 18, 2010 · We synthesized a series of 1,4,7,10-tetraalkyltetracenes using a new 2,6-naphthodiyne precursor and 2,5-dialkylfurans as starting materials (alkyl=methyl to hexyl). Surprisingly, the solid-state...
WebAbstract We synthesized a series of 1,4,7,10‐tetraalkyltetracenes using a new 2,6‐naphthodiyne precursor and 2,5‐dialkylfurans as starting materials (alkyl=methyl to hexyl). Surprisingly, the solid...
list of invasive proceduresWebTetracene octaesters, which were prepared by twofold [2+2+2] cocyclization, were isolated as red, orange, and orange-yellow solids for the methyl, ethyl, and propyl ester … im berg cottbusWebAlkyl-Engineered Dual-State Luminogens with Pronounced Odd–Even Effects: Quantum Yields with up to 48% Difference and Crystallochromy with up to 22 nm Difference Author: Yuanye Yin, Aixiang Ding, Felicia He, Chengyuan Wang, Lin Kong, Jiaxiang Yang Source: Journal of physical chemistry 2024 v.126 no.15pp. 2921-2929 ISSN: 1520-5207 Subject: imber grove esherWebcrystallochromy effects are derived from the unique crystal-packing patterns. The fluorescence quantum yields in the so-lid state probably depend on the relative positional relation-ship of the nearest neighboring molecules in one column as well as the crystal rigidity. among acenes. Furthermore, the fluorescence quantum list of invasive species in georgiaWebMay 1, 2000 · Solution spectra of perylenetetracarboxylic dianhydride (PTCDA) show an equilibrium between monomers and dimers, with fluorescence exclusively from monomers and absorption from both. The dimer absorption follows closely the spectrum of PTCDA stacks in crystalline films, which indicate strong coupling to a molecular vibration and … imberg showWebApr 8, 2024 · The odd–even effect in FLQY is over 26% alternation, and a maximum of 48% difference in FLQY was observed between the compounds C1 and C2 with a methyl and … im bereich human resourcesWebJul 1, 2003 · Many organic colorants show crystallochromy, i.e. the dependence of color on crystal packing. [ 46] This dependence has various reasons. Firstly, the molecules in the crystals may exist as different tautomers or may adopt different conformations. imberg thomas