Bimanes 22. Flexible fluorescent molecules. Solvent effects on the photophysical properties of syn-bimanes (1,5-diazabicyclo[3.3.0]octa-3,6-diene-2,8-diones)

1986 ◽  
Vol 90 (22) ◽  
pp. 5552-5557 ◽  
Author(s):  
Edward M. Kosower ◽  
Rina Giniger ◽  
Annette Radkowsky ◽  
David Hebel ◽  
Alan Shusterman
Keyword(s):  
Solvent Effects ◽  
Photophysical Properties ◽  
Fluorescent Molecules

Probing the Structural Features and the Micro-heterogeneity of Various Deep Eutectic Solvents and their Water Dilutions by the Photophysical Behaviour of Two Fluorophores

2020 ◽  
Author(s):  
Matteo Tiecco ◽  
Irene Di Guida ◽  
Pier Luigi Gentili ◽  
Raimondo Germani ◽  
Carmela Bonaccorso ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Transient Absorption ◽  
Photophysical Properties ◽  
Deep Eutectic Solvents ◽  
Structural Features ◽  
Solvation Dynamics ◽  
Structured Systems ◽  
Reduced Viscosity ◽  
Bond Network ◽  
Fluorescent Molecules

<div><div><div><p>The structural features of a series of diverse Deep Eutectic Solvents (DESs) have been investigated and characterized by means of two fluorescent probes. The spectral and photophysical properties of the latter are strictly dependent on the experienced environment, so that they can provide insights into the polarity, viscosity, hydrogen-bond network, and micro-heterogeneity of the various DESs.</p><p>In fact, the investigated DESs exhibit a variety of properties with regards to their hydrophilicity, acidity, and hydrogen-bond ability, and these details were deeply probed by the two fluorescent molecules. The effect of the addition of water, which is a key strategy for tuning the properties of these structured systems, was also tested. In particular, the excited state dynamics of the probes, measured by femtosecond-resolved transient absorption, proved instrumental in understanding the changes in the structural properties of the DESs, namely reduced viscosity and enhanced heterogeneity, as the water percentage increases. Differences between the various DESs in terms of both local microheterogeneity and bulk viscosity also emerged from the peculiar multi-exponential solvation dynamics undergone by the excited states of the probes.</p></div></div></div>

Probing the Structural Features and the Micro-heterogeneity of Various Deep Eutectic Solvents and their Water Dilutions by the Photophysical Behaviour of Two Fluorophores

2020 ◽  
Author(s):  
Matteo Tiecco ◽  
Irene Di Guida ◽  
Pier Luigi Gentili ◽  
Raimondo Germani ◽  
Carmela Bonaccorso ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Transient Absorption ◽  
Photophysical Properties ◽  
Deep Eutectic Solvents ◽  
Structural Features ◽  
Solvation Dynamics ◽  
Structured Systems ◽  
Reduced Viscosity ◽  
Bond Network ◽  
Fluorescent Molecules

<div><div><div><p>The structural features of a series of diverse Deep Eutectic Solvents (DESs) have been investigated and characterized by means of two fluorescent probes. The spectral and photophysical properties of the latter are strictly dependent on the experienced environment, so that they can provide insights into the polarity, viscosity, hydrogen-bond network, and micro-heterogeneity of the various DESs.</p><p>In fact, the investigated DESs exhibit a variety of properties with regards to their hydrophilicity, acidity, and hydrogen-bond ability, and these details were deeply probed by the two fluorescent molecules. The effect of the addition of water, which is a key strategy for tuning the properties of these structured systems, was also tested. In particular, the excited state dynamics of the probes, measured by femtosecond-resolved transient absorption, proved instrumental in understanding the changes in the structural properties of the DESs, namely reduced viscosity and enhanced heterogeneity, as the water percentage increases. Differences between the various DESs in terms of both local microheterogeneity and bulk viscosity also emerged from the peculiar multi-exponential solvation dynamics undergone by the excited states of the probes.</p></div></div></div>

scholarly journals Absolute quantum yield measurements of fluorescent proteins using a plasmonic nanocavity

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Daja Ruhlandt ◽  
Martin Andresen ◽  
Nickels Jensen ◽  
Ingo Gregor ◽  
Stefan Jakobs ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Fluorescent Proteins ◽  
Photophysical Properties ◽  
Dark State ◽  
Absolute Quantum Yield ◽  
Yield Values ◽  
Calibration Free ◽  
Protein Ensembles ◽  
Fluorescent Molecules ◽  
Absolute Quantum

AbstractOne of the key photophysical properties of fluorescent proteins that is most difficult to measure is the quantum yield. It describes how efficiently a fluorophore converts absorbed light into fluorescence. Its measurement using conventional methods become particularly problematic when it is unknown how many of the proposedly fluorescent molecules of a sample are indeed fluorescent (for example due to incomplete maturation, or the presence of photophysical dark states). Here, we use a plasmonic nanocavity-based method to measure absolute quantum yield values of commonly used fluorescent proteins. The method is calibration-free, does not require knowledge about maturation or potential dark states, and works on minute amounts of sample. The insensitivity of the nanocavity-based method to the presence of non-luminescent species allowed us to measure precisely the quantum yield of photo-switchable proteins in their on-state and to analyze the origin of the residual fluorescence of protein ensembles switched to the dark state.

SOLVENT EFFECTS ON PHOTOPHYSICAL PROPERTIES OF ORGANIC DYES IN THE POLYMER MATRIX

2020 ◽  
Vol 42 (2) ◽  
pp. 104-113
Author(s):  
T.V. Bezrodna ◽  
◽  
V.I. Bezrodnyi ◽  
A.M. Negriyko ◽  
L.F. Kosyanchuk ◽  
...  
Keyword(s):  
Polymer Matrix ◽  
Solvent Effects ◽  
Organic Dyes ◽  
Photophysical Properties

Porphyrazines with oligo(ethylene oxide) thio alkoxy chains: Synthesis, aggregation, photophysics, and complexation with redox-active ions

2004 ◽  
Vol 08 (08) ◽  
pp. 1055-1061 ◽  
Author(s):  
Dennis P. Piet ◽  
Harald Veldhuis ◽  
Han Zuilhof ◽  
Ernst J. R. Sudhölter
Keyword(s):  
Phase Transitions ◽  
Liquid Phase ◽  
Ethylene Oxide ◽  
Solvent Effects ◽  
Photophysical Properties ◽  
Redox Couple ◽  
Aggregate Formation ◽  
Isotropic Liquid ◽  
Liquid Crystallinity ◽  
Redox Active

A series of new porphyrazines with oligo(ethylene oxide) thioalkoxy side chains has been synthesized. Study of the phase transitions reveals the absence of liquid crystallinity. Due to the ethylene oxide moieties, the solubility in a variety of solvents is dramatically increased. This allowed the first study of solvent effects on the photophysical properties (absorption and emission) in water and chloroform. The complexation of the porphyrazines with the redox couple LiI / I 2 has been studied. No effect on the aggregate formation has been observed in solution, while in a film incorporation of an increased amount of LiI / I 2 leads to a disturbance of the aggregates. At temperatures up to 100°C the porphyrazine - LiI / I 2 complexes are stable in the liquid phase, but from 115°C onwards, small crystallites of LiI are formed in the isotropic liquid.

The effect of methylation on the intrinsic photophysical properties of simple rhodamines

2019 ◽  
Vol 21 (20) ◽  
pp. 10261-10271 ◽  
Author(s):  
Jocky C. K. Kung ◽  
Adam Forman ◽  
Rebecca A. Jockusch
Keyword(s):  
Gas Phase ◽  
Solvent Effects ◽  
Photophysical Properties

Gas-phase studies of progressively methylated rhodamines display unexpected photophysical trends that are obscured in solution, revealing key solvent effects.

SOLVENT EFFECTS ON THE PHOTOPHYSICAL PROPERTIES OF DIBUCAINE: A QUINOLINE ANALOGUE

1987 ◽  
Vol 45 (s1) ◽  
pp. 749-755 ◽  
Author(s):  
C. T. Lin ◽  
M. Malak ◽  
G. Vanderkooi ◽  
W. R. Mason
Keyword(s):  
Solvent Effects ◽  
Photophysical Properties

Detailed photophysical properties of a functionalized ruthenium(II) polypyridyl complex: through-space solvent effects

2001 ◽  
Vol 25 (3) ◽  
pp. 458-464 ◽  
Author(s):  
Andrew C. Benniston ◽  
Philip R. Mackie ◽  
Louis J. Farrugia ◽  
Graeme Smith ◽  
Simon J. Teat ◽  
...  
Keyword(s):  
Solvent Effects ◽  
Photophysical Properties ◽  
Polypyridyl Complex
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