Some features of photoluminescence of polymethine dyes in photoconducting polymers

2002 ◽  
Vol 384 (1) ◽  
pp. 33-41
Author(s):  
N. A. Davidenko ◽  
N. G. Kuvshinsky ◽  
V. G. Syromyatnikov ◽  
S. L. Studzinsky ◽  
N. A. Derevyanko ◽  
...  
2014 ◽  
Vol 59 (3) ◽  
pp. 326-330 ◽  
Author(s):  
S.Yu. Vyshnevskyy ◽  
◽  
I.M. Dmitruk ◽  
A.P. Naumenko ◽  
Yu.L. Bricks ◽  
...  

2019 ◽  
Author(s):  
Chi-Yun Lin ◽  
Matthew Romei ◽  
Luke Oltrogge ◽  
Irimpan Mathews ◽  
Steven Boxer

Green fluorescent protein (GFPs) have become indispensable imaging and optogenetic tools. Their absorption and emission properties can be optimized for specific applications. Currently, no unified framework exists to comprehensively describe these photophysical properties, namely the absorption maxima, emission maxima, Stokes shifts, vibronic progressions, extinction coefficients, Stark tuning rates, and spontaneous emission rates, especially one that includes the effects of the protein environment. In this work, we study the correlations among these properties from systematically tuned GFP environmental mutants and chromophore variants. Correlation plots reveal monotonic trends, suggesting all these properties are governed by one underlying factor dependent on the chromophore's environment. By treating the anionic GFP chromophore as a mixed-valence compound existing as a superposition of two resonance forms, we argue that this underlying factor is defined as the difference in energy between the two forms, or the driving force, which is tuned by the environment. We then introduce a Marcus-Hush model with the bond length alternation vibrational mode, treating the GFP absorption band as an intervalence charge transfer band. This model explains all the observed strong correlations among photophysical properties; related subtopics are extensively discussed in Supporting Information. Finally, we demonstrate the model's predictive power by utilizing the additivity of the driving force. The model described here elucidates the role of the protein environment in modulating photophysical properties of the chromophore, providing insights and limitations for designing new GFPs with desired phenotypes. We argue this model should also be generally applicable to both biological and non-biological polymethine dyes.<br>


2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Heinz Mustroph

Abstract Oxonol dyes are classified as anionic polymethine dyes, which cover a wide variety of structural types. The name of the class originates from the oxygen atoms which terminate each end of the polymethine chains that form the backbone of their structure. In technically useful dyes, these oxygen atoms tend to be substituents of heterocycles. The main technical application of water soluble oxonol dyes was in silver halide photography as filter dyes and antihalation dyes. Lipophilic oxonol dyes are used in bio-analysis and medical diagnostics to stain cells, bacteria or liposomes for example. Their main bioanalytical usage is in the determination of membrane potentials in eukaryotic cells and prokaryotic bacteria.


2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Heinz Mustroph

Abstract Merocyanine dyes belong to the class of neutral polymethine dyes, where one terminal component is typically found in cyanine dyes and the second obtained from an active methylene compound. The different electron acceptor/donator abilities of the two terminal components have a marked impact on the electronic structure of a merocyanine dye and its equilibrium structure and electronic spectra. Their first technical application was spectral sensitization in silver halide photography. Today they have numerous of applications in textile dyeing and as membrane potential sensitive fluorescent dyes.


1990 ◽  
Vol 26 (10) ◽  
pp. 1179-1185 ◽  
Author(s):  
Y. L. Briks ◽  
A. D. Kachkovskii ◽  
N. N. Romanov
Keyword(s):  

1967 ◽  
Vol 6 (2) ◽  
pp. 173-174
Author(s):  
O. L. Lebedev ◽  
Yu. M. Gryaznov ◽  
A. A. Chastov ◽  
A. V. Kazymov

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