scholarly journals Photophysical properties and fluorosolvatochromism of D–π–A thiophene based derivatives

RSC Advances ◽  
2020 ◽  
Vol 10 (71) ◽  
pp. 43459-43471
Author(s):  
Hussain A. Z. Sabek ◽  
Ahmed M. M. Alazaly ◽  
Dina Salah ◽  
Hesham S. Abdel-Samad ◽  
Mohamed A. Ismail ◽  
...  
Keyword(s):  
Photophysical Properties ◽  
Fluorescence Emission ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
Solvation Models

Solvation-dependent photophysical properties of two push–pull thiophene-based compounds with donor–π–acceptor (D–π–A) structures were investigated using absorption, fluorescence emission and time resolved spectroscopy, and supported by different solvation models.

scholarly journals Photophysical Properties of Protoporphyrin IX, Pyropheophorbide-a, and Photofrin® in Different Conditions

2021 ◽  
Vol 14 (2) ◽  
pp. 138
Author(s):  
Bauyrzhan Myrzakhmetov ◽  
Philippe Arnoux ◽  
Serge Mordon ◽  
Samir Acherar ◽  
Irina Tsoy ◽  
...  
Keyword(s):  
Singlet Oxygen ◽  
Photophysical Properties ◽  
Protoporphyrin Ix ◽  
Fluorescence Emission ◽  
Solvent Polarity ◽  
Visible Absorption ◽  
Light Dosimetry ◽  
Time Resolved ◽  
Pyropheophorbide A ◽  
Influence Of Solvent

Photodynamic therapy (PDT) is an innovative treatment of malignant or diseased tissues. The effectiveness of PDT depends on light dosimetry, oxygen availability, and properties of the photosensitizer (PS). Depending on the medium, photophysical properties of the PS can change leading to increase or decrease in fluorescence emission and formation of reactive oxygen species (ROS) especially singlet oxygen (1O2). In this study, the influence of solvent polarity, viscosity, concentration, temperature, and pH medium on the photophysical properties of protoporphyrin IX, pyropheophorbide-a, and Photofrin® were investigated by UV-visible absorption, fluorescence emission, singlet oxygen emission, and time-resolved fluorescence spectroscopies.

Synthesis and photophysical properties of extended π conjugated naphthalimides

2017 ◽  
Vol 16 (4) ◽  
pp. 539-546 ◽  
Author(s):  
C. Rémy ◽  
C. Allain ◽  
I. Leray
Keyword(s):  
Charge Transfer ◽  
Dft Calculations ◽  
Photophysical Properties ◽  
Photoinduced Charge Transfer ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
Td Dft ◽  
Photoinduced Charge

A series of π conjugated naphthalimide derivatives were prepared. Compounds display efficient photoinduced charge transfer in solution which was rationalized by time-resolved spectroscopy and modelled by TD-DFT calculations.

Synthesis, characterization and photophysical properties of ferrocenyl and mixed sandwich cobaltocenyl ester linked meso-triaryl corrole dyads

2017 ◽  
Vol 21 (10) ◽  
pp. 646-657 ◽  
Author(s):  
B. Shivaprasad Achary ◽  
A. R. Ramya ◽  
Rajiv Trivedi ◽  
P. R. Bangal ◽  
L. Giribabu
Keyword(s):  
Transient Absorption ◽  
Photophysical Properties ◽  
Heavy Atom ◽  
Parent Compound ◽  
Fluorescence Emission ◽  
Soret Band ◽  
Transient Absorption Spectroscopy ◽  
Ferrocene Derivatives ◽  
Time Resolved ◽  
Design And Synthesis

We report here the design and synthesis of corrole-metallocene dyads consisting of a metallocene (either ferrocene (Dyad 1) or mixed sandwich [Formula: see text]-[C[Formula: see text]H[Formula: see text](COOH)]Co([Formula: see text]-C[Formula: see text]Ph[Formula: see text] (Dyad 2)) connected via an ester linkage at meso phenyl position. Both the dyads were characterized by [Formula: see text]H NMR, MALDI-TOF, UV-visible, fluorescence spectroscopies (steady-state, picosecond time-resolved), femtosecond transient absorption spectroscopy (fs-TA) and electrochemical methods. The absorption spectra of these dyads showed slight broadening and splitting of the Soret band that indicates a weak ground state interaction between the corrole macrocycle and metallocene part of the present donor–acceptor (D–A) system. However, in both the dyad systems, fluorescence emission of the corrole was quenched in polar solvents as compared to its parent compound 10-(4-hydroxyphenyl)-5,15-bis-(pentafluorophenyl ) corrole (Ph-Corr). The quenching was more pronounced in ferrocene derivatives than in cobaltocenyl derivatives. Transient absorption studies confirm the absence of photoinduced electron transfer from metallocene to correl for these dyad systems and the quenching of singlet state of corrole is found to enhance intersystem crossing due to heavy atom effect.

Synthesis, Photophysical Properties and Photoinduced Intermolecular Electron Transfer of a Novel Aryl Benzyl Ester Dendritic Axially Substituted Silicon (IV) Phthalocyanine

2014 ◽  
Vol 998-999 ◽  
pp. 99-102 ◽  
Author(s):  
Xiu Qin Chen ◽  
Dong Dong Ma ◽  
Su Juan Pan ◽  
Yu Hua Wang ◽  
Kui Zhi Chen ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Photophysical Properties ◽  
Dendritic Structure ◽  
Fluorescence Emission ◽  
Benzyl Ester ◽  
Intermolecular Electron Transfer ◽  
Time Resolved ◽  
H Nmr ◽  
Methoxycarbonyl Group ◽  
Photoinduced Intermolecular Electron Transfer

An aryl benzyl ester dendritic axially substituted silicon (IV) phthalocyanine, a di-{3,5-di-(4-methoxycarbonyl group benzyloxy) benzyloxy) benzyloxy} axially substituted silicon (IV) phthalocyanine (DSiPc) was synthesized. Its structure was characterized by elemental analysis, 1H NMR, IR and ESI-MS. The photophysical property of DSiPc was studied by steady and time-resolved spectroscopic methods. The steric hindrance of dendritic structure can reduced the aggregation efficiently. The photoinduced intermolecular electron transfer between this novel macromolecule and benzoquinone was studied. The results showed that the fluorescence emission of this dendritic phthalocyanine could be quenched by BQ. Therefore, this novel dendritic phthalocyanine was an effective new electron donor and transmission complex could be used as a potential artificial photosynthesis system.

STEADY STATE AND TIME RESOLVED SPECTROSCOPIC STUDY OF CONFINED DYE INSIDE γ-CD IN PRESENCE OF Au NANOPARTICLES

2011 ◽  
Vol 10 (04n05) ◽  
pp. 867-871
Author(s):  
TAPASI SEN ◽  
AMITAVA PATRA
Keyword(s):  
Steady State ◽  
Spectroscopic Study ◽  
Au Nanoparticles ◽  
Light Harvesting ◽  
Photophysical Properties ◽  
Photoluminescence Quenching ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
Potential Applications

The photophysical properties of the confined dye inside the γ-CD in presence of Au nanoparticles have been studied by steady state and time resolved spectroscopy. It is found that the photoluminescence quenching of C480 dye increases from 26% to 49% due to confinement of dye inside γ-CD. The designing of such new optical based materials having coumarin 480 dye inside the γ-CD in presence of Au nanoparticles may have potential applications for light harvesting system.

scholarly journals Verzögerte Fluoreszenz von Mischkristallen aus Benzophenon und aromatischen Kohlenwasserstoffen / Delayed Fluorescence of Benzophenone-Aromatic Hydrocarbon Mixed Crystals

1973 ◽  
Vol 28 (1) ◽  
pp. 45-50
Author(s):  
H. Dreeskamp ◽  
M. Zander
Keyword(s):  
Aromatic Hydrocarbon ◽  
Aromatic Hydrocarbons ◽  
Fluorescence Emission ◽  
Delayed Fluorescence ◽  
Mixed Crystals ◽  
Time Resolved ◽  
Triplet Excitation ◽  
Time Resolved Spectroscopy

The earlier observation of delayed fluorescence in mixed crystals of aromatic hydrocarbons in benzophenone is studiedby time-resolved spectroscopy using methyl-coronene, pentaphene, anthanthrene and 1.8.9-peri-naphto-xanthene besides naphthalene as guests. Host-guest triplet annihilation is identified as the mechanism of delayed fluorescence. Naphthalene as an additional guest component acts as trap for the triplet excitation of the host and further increases the delay of fluorescence emission.

Insights into the effect of donor ability on photophysical properties of dihydroindeno[2,1-c]fluorene-based imide derivatives

2018 ◽  
Vol 20 (11) ◽  
pp. 7514-7522 ◽  
Author(s):  
Guiying He ◽  
Li-Li Zhou ◽  
Hongwei Song ◽  
Zhuoran Kuang ◽  
Xian Wang ◽  
...  
Keyword(s):  
Steady State ◽  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Photophysical Properties ◽  
Time Resolved ◽  
Time Resolved Spectroscopy ◽  
Donor Ability

The photophysical properties of dihydroindeno[2,1-c]fluorene-based imide (DHIFI) derivatives were investigated by steady-state and time-resolved spectroscopy as well as quantum chemical calculations.

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