scholarly journals Synthesis and Photophysical Properties of Fluorescent 6-Aryl-D-π-A Coumarin Derivatives

ACS Omega ◽  
2021 ◽  
Author(s):  
Andrea Cocco ◽  
Paola Caria ◽  
Giuseppina Sanna ◽  
Luigi Stagi ◽  
Enzo Cadoni ◽  
...  
Keyword(s):  
Photophysical Properties ◽  
Coumarin Derivatives

Photophysical properties of coumarin derivatives incorporated in MCM-41

2006 ◽  
Vol 68 (1) ◽  
pp. 33-37 ◽  
Author(s):  
Dongmei Li ◽  
Wenjuan Zhao ◽  
Xuedong Sun ◽  
Jinlong Zhang ◽  
Masakazu Anpo ◽  
...  
Keyword(s):  
Photophysical Properties ◽  
Coumarin Derivatives ◽  
Mcm 41

Effects of phenothiazine and phenoxazine on photophysical properties of coumarin derivatives

2019 ◽  
Vol 74 (1) ◽  
pp. 305-310 ◽  
Author(s):  
Yuling Zhao ◽  
Yanyan Wang ◽  
Xinyu Li ◽  
Yanmei Li ◽  
Youjia Wang ◽  
...  
Keyword(s):  
Photophysical Properties ◽  
Coumarin Derivatives

Revisiting the photophysical properties and excited singlet-state dipole moments of several coumarin derivatives

2011 ◽  
Vol 79 (3) ◽  
pp. 428-436 ◽  
Author(s):  
Lamine Cisse ◽  
Abdoulaye Djande ◽  
Martine Capo-Chichi ◽  
François Delatre ◽  
Adama Saba ◽  
...  
Keyword(s):  
Singlet State ◽  
Dipole Moments ◽  
Photophysical Properties ◽  
Excited Singlet State ◽  
Coumarin Derivatives ◽  
Excited Singlet

scholarly journals Mono vs. Difunctional Coumarin as Photoinitiators in Photocomposite Synthesis and 3D Printing

Catalysts ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1202
Author(s):  
Mahmoud Rahal ◽  
Haifaa Mokbel ◽  
Bernadette Graff ◽  
Joumana Toufaily ◽  
Tayssir Hamieh ◽  
...  
Keyword(s):  
Molecular Weight ◽  
3D Printing ◽  
High Molecular Weight ◽  
Photophysical Properties ◽  
Glass Fibers ◽  
General Rule ◽  
Point Of View ◽  
Polymerization Process ◽  
Coumarin Derivatives ◽  
Acrylate Monomers

This work is devoted to investigate three coumarin derivatives (Coum1, Coum2, and Coum3), proposed as new photoinitiators of polymerization when combined with an additive, i.e., an iodonium salt, and used for the free radical polymerization (FRP) of acrylate monomers under mild irradiation conditions. The different coumarin derivatives can also be employed in three component photoinitiating systems with a Iod/amine (ethyl 4-dimethylaminobenzoate (EDB) or N-phenylglycine (NPG)) couple for FRP upon irradiation with an LED @ 405 nm. These compounds showed excellent photoinitiating abilities, and high polymerization rates and final conversions (FC) were obtained. The originality of this work relies on the comparison of the photoinitiating abilities of monofunctional (Coum1 and Coum2) vs. difunctional (Coum3) compounds. Coum3 is a combined structure of Coum1 and Coum2, leading to a sterically hindered chemical structure with a relatively high molecular weight. As a general rule, a high molecular weight should reduce the migration of initiating molecules and favor photochemical properties such as photobleaching of the final polymer. As attempted, from the efficiency point of view, Coum3 can initiate the FRP, but a low reactivity was observed compared to the monofunctional compound (Coum1 and Coum2). Indeed, to study the photochemical and photophysical properties of these compounds, different parameters were taken into account, e.g., the light absorption and emission properties, steady state photolysis, and fluorescence quenching. To examine these different points, several techniques were used including UV-visible spectroscopy, real-time Fourier Transform Infrared Spectroscopy (RT-FTIR), fluorescence spectroscopy, and cyclic voltammetry. The photochemical mechanism involved in the polymerization process is also detailed. The best coumarins investigated in this work were used for laser writing (3D printing) experiments and also for photocomposite synthesis containing glass fibers.

scholarly journals Individual control of singlet lifetime and triplet yield in halogen-substituted coumarin derivatives

RSC Advances ◽  
2020 ◽  
Vol 10 (45) ◽  
pp. 27096-27102
Author(s):  
Katrin E. Oberhofer ◽  
Mikayel Musheghyan ◽  
Sebastian Wegscheider ◽  
Martin Wörle ◽  
Eleonora D. Iglev ◽  
...  
Keyword(s):  
Dft Calculations ◽  
Absorption Spectroscopy ◽  
Transient Absorption ◽  
Photophysical Properties ◽  
Transient Absorption Spectroscopy ◽  
Coumarin Derivatives ◽  
Individual Control

The photophysical properties of three 3-diethylphosphonocoumarin derivatives are studied by transient absorption spectroscopy and DFT calculations.

Photophysical Properties of Coumarin Derivatives in Solvents

1999 ◽  
Vol 15 (12) ◽  
pp. 1076-1081 ◽  
Author(s):  
Dai Zhao-Hua ◽  
◽  
Wu Shi-Kang
Keyword(s):  
Photophysical Properties ◽  
Coumarin Derivatives

Study of Photophysical Properties on Newly Synthesized Coumarin Derivatives

2017 ◽  
Vol 27 (6) ◽  
pp. 2223-2229 ◽  
Author(s):  
Ashok H. Sidarai ◽  
Vani R. Desai ◽  
Shirajahammad M. Hunagund ◽  
Mahantesha Basanagouda ◽  
Jagadish S. Kadadevarmath
Keyword(s):  
Photophysical Properties ◽  
Coumarin Derivatives
Sign in / Sign up

Export Citation Format

Share Document