Crystallochromy
WebOct 10, 2009 · Quantum chemical ab initio calculations are performed at MP2 and B3LYP levels of theory and 6-311 ++G** basis set in order to determine the changes in the geometrical parameters and IR-spectroscopic characteristics as a result of Npy protonation. The observed crystallochromy effect is discussed as well. WebCrystallochromy of perylene pigments: Influence of an ... - Idsia. EN. English Deutsch Français Español Português Italiano Român Nederlands Latina Dansk Svenska Norsk …
Crystallochromy
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WebJul 4, 2024 · We demonstrate crystallochromy in that small changes in the packing structure give rise to dramatically different absorption spectra. Through a remarkable comparison between squaraines in poly ... 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. X-Ray crystallographic analysis reveals that the difference in solid-state color arises owing to diffe …
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... WebMay 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 …
WebCrystallography is the experimental science of determining the arrangement of atoms in crystalline solids. Crystallography is a fundamental subject in the fields of materials …
WebAug 30, 2013 · The crystallochromy of the red and yellow solids of tetracenes was theoretically investigated using the transition-density-fragment interaction combined with …
WebJul 13, 2012 · Tuning the Solid‐State Optical Properties of Tetracene Derivatives by Modification of the Alkyl Side‐Chains: Crystallochromy and the Highest Fluorescence Quantum Yield in Acenes Larger than Anthracene. Chitoshi Kitamura. E-mail address: [email protected]‐hyogo.ac.jp. iris paper folding heartWebTetracene 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 … porsche dealerships near atlantaWebAs demonstrated in a recent model study of several perylene pigments crystallizing in the monoclinic space group P 21/c, the optical properties in the crystalline phase are … iris paper folding peacockWebAug 30, 2013 · The crystallochromy of the red and yellow solids of tetracenes was theoretically investigated using the transition-density-fragment interaction combined with … iris paper folding heart patternWebAbstract 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... porsche dealerships north carolinaWebMay 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. porsche delaware - newarkWebWhen we searched the literature, we stumbled upon a nice term “crystallochromy,” which defined as the dependence of solid-state color on molecular packing. This term was first brought by a BASF group [ 7 ], who studied a series … porsche delayed production