Versuche zur Berechnung der Fluoreszenzspektren organischer Farbstoffe

1980 ◽  
Vol 35 (4) ◽  
pp. 428-430 ◽  
Author(s):  
Walter Fabian
Keyword(s):  
Fluorescence Spectra ◽  
Organic Dyes ◽  
Fluorescent State ◽  
Variation Procedure

Abstract Attempts to Calculate the Fluorescence Spectra of Organic dyes Within the scope of the PPP-approximation a β-variation procedure is used to calculate the fluorescence spectra of some organic dyes and to estimate geometry changes upon excitation into the fluorescent state.

Fluorescence spectra of organic dyes in solution: a time dependent multilevel approach

2011 ◽  
Vol 13 (6) ◽  
pp. 2160-2166 ◽  
Author(s):  
Vincenzo Barone ◽  
Julien Bloino ◽  
Susanna Monti ◽  
Alfonso Pedone ◽  
Giacomo Prampolini
Keyword(s):  
Fluorescence Spectra ◽  
Organic Dyes ◽  
Time Dependent ◽  
Multilevel Approach

Dye Mixing Effects on Photocatalytic Water Splitting Activity on Dye-Modified KTaO3 Catalyst

2010 ◽  
Vol 132 (2) ◽  
Author(s):  
Hidehisa Hagiwara ◽  
Hiroshige Matsumoto ◽  
Tatsumi Ishihara
Keyword(s):  
Photocatalytic Activity ◽  
Water Splitting ◽  
Photoelectron Spectroscopy ◽  
Fluorescence Spectra ◽  
Organic Dyes ◽  
Energy Conversion Efficiency ◽  
Central Metal ◽  
X Ray ◽  
Mixing Effects ◽  
Positive Effect

Dye mixing effects on water splitting activity of KTaO3 photocatalyst modified by various porphyrinoids was investigated. Photocatalytic activity of dye-modified KTaO3 catalyst is greatly improved by mixing various porphyrinoids, in which transition metals such as Cr, Fe, and Co are used as central metal. Pentametylene bis[4-(10, 15, 20-triphenyl porphine-5-yl) benzoate]-dizinc(II) (Zn-TPP dimer) showed positive effect on photocatalytic activity, and H2 and O2 formation rates are 365 μmol g−cat.−1 h−1 and 152 μmol g−cat.−1 h−1, respectively. On the other hand, the combination of chloroprotoporphyrinato iron (III) (chlorohemin) with Cr-phthalocyanine (CrPc) is the most effective for increasing water splitting activity, and the formation rates of H2 and O2 are 2.12 mmol g−cat.−1 h−1 and 1.11 mmol g−cat.−1 h−1, respectively. Energy conversion efficiency of this photocatalyst is estimated to be approximately 0.05%. From X-ray photoelectron spectroscopy measurement and cyclic voltammetry of organic dyes, it is suggested that the electronic state of the dye mixture is modified compared with that of a single dye. Energy transfer between mixing dyes is observed in the fluorescence spectra of dye-modified KTaO3 photocatalysts. Recombination of photoexited charge in KTaO3 is clearly suppressed by dye mixing, thus improvement of photocatalytic activity is attributed to the lengthening of excitation lifetime. This study reveals that mixing porphyrinoid dyes is an effective method for increasing water splitting activity of dye-modified KTaO3 photocatalysts.

scholarly journals Study the Absorption and Fluorescence Spectra of Some Organic Dyes

2019 ◽  
Vol 14 (4) ◽  
pp. 7270-7276
Author(s):  
Afrah M. AL-Hussainey ◽  
Salar Hussein Ibrahem ◽  
Talib M. Abbas
Keyword(s):  
Fluorescence Spectra ◽  
Organic Dyes ◽  
Absorption And Fluorescence Spectra

scholarly journals Investigation of Five Organic Dyes in Ethanol and Butanol for Two-Color Laser-Induced Fluorescence Ratio Thermometry

Optics ◽  
2019 ◽  
Vol 1 (1) ◽  
pp. 1-17 ◽  
Author(s):  
Yogeshwar Nath Mishra ◽  
Ajeth Yoganantham ◽  
Matthias Koegl ◽  
Lars Zigan
Keyword(s):  
Rhodamine B ◽  
Fluorescence Spectra ◽  
Rhodamine 6G ◽  
Organic Dyes ◽  
Laser Induced Fluorescence ◽  
Eosin Y ◽  
Temperature Dependent ◽  
Spectral Bands ◽  
Sulforhodamine 101 ◽  
Fluorescence Thermometry

In this article, we compare absorption and temperature-dependent fluorescence spectra of five organic dyes for 2c-LIF (two-color laser-induced fluorescence) thermometry in ethanol and butanol. The dyes fluorescein, eosin Y, rhodamine B, rhodamine 6G, and sulforhodamine 101 individually mixed in ethanol and butanol were studied at liquid temperatures of 25–65 °C. The self-absorption spectral bands are analyzed along with intensity ratios and the respective sensitivities for one-dye and two-dye 2c-LIF thermometry are deduced. For one-dye 2c-LIF, rhodamine B showed the highest sensitivity of 2.93%/°C and 2.89%/°C in ethanol and butanol, respectively. Sulforhodamine 101 and rhodamine 6G showed the least sensitivities of 0.51%/°C and 1.24%/°C in ethanol and butanol, respectively. For two-dye 2c-LIF, rhodamine B/sulforhodamine 101 exhibited the highest temperature sensitivities of 2.39%/°C and 2.54%/°C in ethanol and butanol, respectively. The dye pair eosin Y/sulforhodamine 101 showed the least sensitivities of 0.15%/°C and 0.27%/°C in ethanol and butanol, respectively.

scholarly journals Synthesis of Catechol Derived Rosamine Dyes and Their Reactivity toward Biogenic Amines

Molecules ◽  
2021 ◽  
Vol 26 (16) ◽  
pp. 5082
Author(s):  
Filipe Monteiro-Silva ◽  
Carla Queirós ◽  
Andreia Leite ◽  
María T. Rodríguez ◽  
María J. Rojo ◽  
...  
Keyword(s):  
Biogenic Amines ◽  
Fluorescence Spectra ◽  
Color Change ◽  
Organic Dyes ◽  
Photophysical Properties ◽  
Primary Amines ◽  
Spectral Changes ◽  
Yellow Color ◽  
Acetonitrile Solutions ◽  
Probe Response

Functional organic dyes play a key role in many fields, namely in biotechnology and medical diagnosis. Herein, we report two novel 2,3- and 3,4-dihydroxyphenyl substituted rosamines (3 and 4, respectively) that were successfully synthesized through a microwave-assisted protocol. The best reaction yields were obtained for rosamine 4, which also showed the most interesting photophysical properties, specially toward biogenic amines (BAs). Several amines including n- and t-butylamine, cadaverine, and putrescine cause spectral changes of 4, in UV–Vis and fluorescence spectra, which are indicative of their potential application as an effective tool to detect amines in acetonitrile solutions. In the gas phase, the probe response is more expressive for spermine and putrescine. Additionally, we found that methanolic solutions of rosamine 4 and n-butylamine undergo a pink to yellow color change over time, which has been attributed to the formation of a new compound. The latter was isolated and identified as 5 (9−aminopyronin), whose solutions exhibit a remarkable increase in fluorescence intensity together with a shift toward more energetic wavelengths. Other 9-aminopyronins 6a, 6b, 7a, and 7b were obtained from methanolic solutions of 4 with putrescine and cadaverine, demonstrating the potential of this new xanthene entity to react with primary amines.

Raman And Fluorescence Spectra Observed in Laser Microprobe Measurements of Several Compositions in the Ln-Ba-Cu-O System

1990 ◽  
Vol 48 (2) ◽  
pp. 278-279
Author(s):  
Edgar S. Etz ◽  
Thomas D. Schroeder ◽  
Winnie Wong-Ng
Keyword(s):  
Fluorescence Spectra ◽  
Single Phase ◽  
X Ray Diffraction ◽  
Ceramic Powders ◽  
Conventional Solid State Reaction ◽  
X Ray ◽  
Raman Microprobe ◽  
Methods Of Synthesis ◽  
Compositional Homogeneity ◽  
Processing Techniques

We are investigating by Raman microprobe measurements the superconducting and related phases in the LnBa2Cu3O7-x (for x=0 to 1) system where yttrium has been replaced by several of the lanthanide (Ln = Nd,Sm,Eu,Ho,Er) elements. The aim is to relate the observed optical spectra (Raman and fluorescence) to the compositional and structural properties of these solids as part of comprehensive materials characterization. The results are correlated with the methods of synthesis, the processing techniques of these materials, and their superconducting properties. Of relevance is the substitutional chemistry of these isostructural systems, the differences in the spectra, and their microanalytical usefulness for the detection of impurity phases, and the assessment of compositional homogeneity. The Raman spectra of most of these compounds are well understood from accounts in the literature.The materials examined here are mostly ceramic powders prepared by conventional solid state reaction techniques. The bulk samples are of nominally single-phase composition as determined by x-ray diffraction.

Quantum Dot Bioconjugates as Energy Donors in Fluorescence Resonance Energy Transfer Assays

2003 ◽  
Vol 773 ◽  
Author(s):  
Aaron R. Clapp ◽  
Igor L. Medintz ◽  
J. Matthew Mauro ◽  
Hedi Mattoussi
Keyword(s):  
Energy Transfer ◽  
Quantum Dot ◽  
Organic Dyes ◽  
Resonance Energy Transfer ◽  
Resonance Energy ◽  
Genetically Engineered ◽  
Molar Ratio ◽  
Binding Assays ◽  
Specific Sequence ◽  
Donor Acceptor

AbstractLuminescent CdSe-ZnS core-shell quantum dot (QD) bioconjugates were used as energy donors in fluorescent resonance energy transfer (FRET) binding assays. The QDs were coated with saturating amounts of genetically engineered maltose binding protein (MBP) using a noncovalent immobilization process, and Cy3 organic dyes covalently attached at a specific sequence to MBP were used as energy acceptor molecules. Energy transfer efficiency was measured as a function of the MBP-Cy3/QD molar ratio for two different donor fluorescence emissions (different QD core sizes). Apparent donor-acceptor distances were determined from these FRET studies, and the measured distances are consistent with QD-protein conjugate dimensions previously determined from structural studies.

Semiconductor Quantum Dots for Multicolor Fluorescence Imaging and Spectroscopy of Single Cancer Cells

2003 ◽  
Vol 773 ◽  
Author(s):  
Xiaohu Gao ◽  
Shuming Nie ◽  
Wallace H. Coulter
Keyword(s):  
Quantum Dots ◽  
Cancer Cells ◽  
Fluorescence Imaging ◽  
Organic Dyes ◽  
Fluorescent Proteins ◽  
Single Cells ◽  
Quantitative Imaging ◽  
Semiconductor Quantum Dots ◽  
Single Cancer ◽  
Imaging And Spectroscopy

AbstractLuminescent quantum dots (QDs) are emerging as a new class of biological labels with unique properties and applications that are not available from traditional organic dyes and fluorescent proteins. Here we report new developments in using semiconductor quantum dots for quantitative imaging and spectroscopy of single cancer cells. We show that both live and fixed cells can be labeled with multicolor QDs, and that single cells can be analyzed by fluorescence imaging and wavelength-resolved spectroscopy. These results raise new possibilities in cancer imaging, molecular profiling, and disease staging.

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