Molecular Design of UV–vis Absorption and Emission Properties in Organic Fluorophores: Toward Larger Bathochromic Shifts, Enhanced Molar Extinction Coefficients, and Greater Stokes Shifts

2013 ◽  
Vol 117 (32) ◽  
pp. 16584-16595 ◽  
Author(s):  
Xiaogang Liu ◽  
Zhaochao Xu ◽  
Jacqueline M. Cole
Keyword(s):  
Molecular Design ◽  
Organic Fluorophores ◽  
Extinction Coefficients ◽  
Absorption And Emission ◽  
Emission Properties ◽  
Stokes Shifts ◽  
Molar Extinction Coefficients

π-Extension of a 4-ethoxy-1,3-thiazole via aryl alkyne cross coupling: synthesis and exploration of the electronic structure

2015 ◽  
Vol 14 (11) ◽  
pp. 2097-2107 ◽  
Author(s):  
Stefanie H. Habenicht ◽  
Stefan Schramm ◽  
Mingming Zhu ◽  
Robert R. A. Freund ◽  
Teresa Langenstück ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Cross Coupling ◽  
Extinction Coefficients ◽  
Twofold Increase ◽  
Stokes Shifts ◽  
Molar Extinction Coefficients

π-Extension of 4-ethoxy-1,3-thiazolesviaaryl coupling resulted in a twofold increase of molar extinction coefficients and larger Stokes’ shifts.

Absorption and emission properties of a europium(II) cryptate in aqueous solution

1982 ◽  
Vol 90 (4) ◽  
pp. 265-268 ◽  
Author(s):  
N. Sabbatini ◽  
M. Ciano ◽  
S. Dellonte ◽  
A. Bonazzi ◽  
V. Balzani
Keyword(s):  
Aqueous Solution ◽  
Absorption And Emission ◽  
Emission Properties

Optical absorption and emission properties of Nd3+-doped fluorophosphates glass for broadband fiber amplifier applications

2003 ◽  
Author(s):  
Ju H. Choi ◽  
Frank G. Shi ◽  
Alfred A. Margaryan ◽  
Ashot Margaryan ◽  
Wytze E. van der Veer
Keyword(s):  
Optical Absorption ◽  
Fiber Amplifier ◽  
Absorption And Emission ◽  
Emission Properties

ASSOCIATION OF CERIC IONS WITH SULPHATE (A SPECTRAL STUDY)

1951 ◽  
Vol 29 (10) ◽  
pp. 828-837 ◽  
Author(s):  
T. J. Hardwick ◽  
E. Robertson
Keyword(s):  
Spectral Study ◽  
Association Constants ◽  
Extinction Coefficients ◽  
Ceric Ion ◽  
Molar Extinction Coefficients

Ceric ion has been shown to associate with sulphate ion to form successively Ce(SO4++, Ce(SO4)2, and Ce(SO4)3−. The association constants relating these species have been determined at 25 °C. The molar extinction coefficients of each associated complex have been found between 395 and 430 mμ. Migration experiments bear out the results qualitatively.

Synthesis and characterization of meso-to-meso directly linked porphyrin-diazaporphyrin triads

2018 ◽  
Vol 22 (09n10) ◽  
pp. 814-820
Author(s):  
Yingying Jia ◽  
Ling Xu ◽  
Bangshao Yin ◽  
Mingbo Zhou ◽  
Jianxin Song
Keyword(s):  
Nickel Complex ◽  
High Resolution Mass Spectrometry ◽  
Dihedral Angles ◽  
X Ray Diffraction ◽  
Extinction Coefficients ◽  
X Ray ◽  
H Nmr ◽  
First Time ◽  
Molar Extinction Coefficients

Beginning with 5,10,15-triarylporphyrin-nickel complex, five meso-to-meso directly linked porphyrin-diazaporphyrin triads were successfully prepared for the first time through a series of reactions including formylation via Vilsmeier–Haack reaction, condensation with pyrrole, bromination with [Formula: see text]-Bromosuccinimide (NBS), oxidation with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone (DDQ), metal-templated cyclization of dibromodipyrrin-metal complexes with NaN[Formula: see text] and demetalization. All these triads were comprehensively characterized by [Formula: see text]H NMR, high-resolution mass spectrometry and UV-vis absorption. In addition, the structure of compound 6Ni was unambiguously determined by X-ray diffraction analysis, which showed that the two dihedral angles are both 86.65 (4)[Formula: see text] between each mean plane of porphyrin and that of central diazaporphyrin The UV-vis absorption spectra disclosed that the longest wavelengths of Soret bands and Q bands for these triads were observed at 429 and 642 nm, respectively. In contrast to diazaporphyrin-porphyrin dyads, diazaporphyrin dimers and diazaporphyrin monomers reported previously the molar extinction coefficients, particularly for triad 8Ni are much higher.

scholarly journals Quantification of acidic sites of nanoscopic hydroxylated magnesium fluorides by FTIR and 15N MAS NMR spectroscopy

RSC Advances ◽  
2015 ◽  
Vol 5 (109) ◽  
pp. 89659-89668 ◽  
Author(s):  
Felix Hemmann ◽  
Iker Agirrezabal-Telleria ◽  
Christian Jaeger ◽  
Erhard Kemnitz
Keyword(s):  
Nmr Spectroscopy ◽  
Mas Nmr ◽  
New Method ◽  
Extinction Coefficients ◽  
Surface Sites ◽  
Acidic Sites ◽  
Molar Extinction Coefficients

A new method is described for the calculation of molar extinction coefficients for quantitative FTIR measurements of acidic surface sites.

EXPERIMENTAL STUDIES OF SOLUTION PROCESSES: VI. EFFECT OF SOLVENT ON INFRARED ABSORPTION SPECTRA

1960 ◽  
Vol 38 (10) ◽  
pp. 1921-1926 ◽  
Author(s):  
P. A. D. De Maine ◽  
L. H. Daly ◽  
M. M. De Maine
Keyword(s):  
Infrared Absorption ◽  
Experimental Studies ◽  
Absorption Data ◽  
Frequency Shifts ◽  
Extinction Coefficients ◽  
Effect Of Solvent ◽  
Solution Processes ◽  
Pure Substances ◽  
Infrared Absorption Spectra ◽  
Molar Extinction Coefficients

Here are reported infrared absorption data between 4000 cm−1 and 700 cm−1 near 19 °C for methanol, n-propanol, isopropanol, cyclohexanol, benzyl alcohol, diethyl ether, anisole, 1,4-dioxane, diisopropyl ether, nitromethane, acetone, p-xylene, benzene, and hexane as pure substances and in carbon tetrachloride solution. Band frequencies accurate to within 1 cm−1 are reported. Except for the 3340 cm−1 band in dilute MeOH solutions no frequency shifts were observed even with gross changes of the electrical properties of the solutions. Molar extinction coefficients at absorption maxima are discussed briefly.

One- and two-photon absorption and emission properties of heteroaromatic bichromophores

2008 ◽  
Author(s):  
Alessandro Abbotto ◽  
Luca Bellotto ◽  
Renato Bozio ◽  
Camilla Ferrante ◽  
Ilaria Fortunati ◽  
...  
Keyword(s):  
Photon Absorption ◽  
Absorption And Emission ◽  
Emission Properties ◽  
Two Photon Absorption ◽  
Two Photon

Synthesis of Galloyl-Coenzyme A Thioester

1982 ◽  
Vol 37 (9) ◽  
pp. 778-783 ◽  
Author(s):  
Georg G. Gross
Keyword(s):  
Absorption Band ◽  
Hydroxamic Acid ◽  
Uv Spectra ◽  
Iron Complex ◽  
Difference Spectra ◽  
Extinction Coefficients ◽  
Thioester Bond ◽  
Maximal Absorption ◽  
Major Absorption Band ◽  
Molar Extinction Coefficients

Galloyl-CoA, a potential intermediate in the biosynthesis of gallotannins, has been prepared via N-succinimidyl 4-O-β-ᴅ-glucosidogallate and 4-O-β-ᴅ-glucosidogalloyl-CoA. Besides a major absorption band at 261 nm, the UV-spectra of the purified thioester and its corresponding 4-O-glucoside contain a longer wavelenght absorption band due to the thioester linkage at 305 nm (galloyl-CoA) or at 290 nm (shoulder, glucosidogalloyl-CoA). The molar extinction coefficients ε of the two thioesters were determined via the iron-complex of 4-O-β-ᴅ-glucosidogalloyl hydroxamic acid; ε261-values of 19.5 × 106 [cm2 mol-1] and 21.5 × 106 [cm2 mol-1] were calculated for galloyl-CoA and its glucoside, respectively. Difference spectra, i.e. absorbance before esterolysis and after, revealed maximal absorption of the thioester bond at 310 nm (⊿ε = 7.4 × 106 [cm2 mol-1]) for galloyl-CoA and at 282 nm (⊿ε = 7.2 × 106 [cm2 mol-6]) for glu- cosidogalloyl-CoA. The two thioesters were further characterized by determining their half-lifes during hydroxylaminolysis and alkaline hydrolysis.

New Z-chalcones obtained from aloe-emodin: Synthesis, characterization and photophysical properties

2019 ◽  
Vol 43 (3-4) ◽  
pp. 101-106
Author(s):  
Nieves Canudas ◽  
Manuel Moreno ◽  
Sara Pekerar ◽  
Carlos Gámez ◽  
Estefania Sucre ◽  
...  
Keyword(s):  
Potassium Hydroxide ◽  
Room Temperature ◽  
Photophysical Properties ◽  
Emission Spectra ◽  
Nmr Studies ◽  
Extinction Coefficients ◽  
Chalcone Derivatives ◽  
Aloe Emodin ◽  
Aldehyde Derivative ◽  
Molar Extinction Coefficients

Three new Z-chalcone derivatives were synthesized under stereoselective conditions by condensation between an aldehyde derivative (prepared from aloe-emodin) and an acetophenone, using potassium hydroxide in dimethyl sulfoxide/H2O at room temperature. The Z configuration of the chalcone derivatives was established by nuclear magnetic resonance (NMR) studies. Photophysical properties related to the UV-Vis absorption/emission spectra and molar extinction coefficients (ε) in different solvents were determined.

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