Metal-binding hydrazone photoswitches for visible light reactivity and variable relaxation kinetics

2017 ◽  
Vol 16 (11) ◽  
pp. 1604-1612 ◽  
Author(s):  
Kacey C. Hall ◽  
Andrew T. Franks ◽  
Rory C. McAtee ◽  
Michael S. Wang ◽  
Vivian I. Lu ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Visible Light ◽  
Binding Affinity ◽  
Blue Light ◽  
Metal Binding ◽  
Relaxation Kinetics ◽  
Photostationary State ◽  
State Composition

Photoactive aroylhydrazones demonstrate variability in UVA, UVC and blue light photoreactivity, photostationary state composition, photoisomer thermal stability, and relative iron(iii) binding affinity in ways that may inform metal-gated photoswitching applications.

scholarly journals First thermal studies on visible-light-switchable negative T-type photochromes of a nitrile-rich series

RSC Advances ◽  
2021 ◽  
Vol 11 (34) ◽  
pp. 21097-21103
Author(s):  
Mikhail Yu. Belikov ◽  
Mikhail Yu. Ievlev
Keyword(s):  
Thermal Stability ◽  
Visible Light ◽  
Temperature Effect ◽  
Thermal Studies ◽  
First Time ◽  
Thermal Stability Of

The temperature effect on the thermal stability of both the initial and photoinduced forms of nitrile-rich T-type photochromes was studied for the first time.

Blue-light-emitting carbazole derivates with high thermal stability

2009 ◽  
Vol 32 (2) ◽  
pp. 398-401 ◽  
Author(s):  
Zhiyong Yang ◽  
Zhenguo Chi ◽  
Lin Zhou ◽  
Xiqi Zhang ◽  
Meina Chen ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Blue Light ◽  
High Thermal Stability ◽  
Light Emitting

Blue Light Driven Free-Radical Polymerization using Arylazo Sulfones as Initiators

2021 ◽  
Author(s):  
Andrea Nitti ◽  
Angelo Martinelli ◽  
Fabrice Batteux ◽  
Stefano Protti ◽  
Maurizio Fagnoni ◽  
...  
Keyword(s):  
Free Radical ◽  
Visible Light ◽  
Radical Polymerization ◽  
Blue Light ◽  
Room Temperature ◽  
Free Radical Polymerization

The polymerization of a broad range of electron-poor olefins has been achieved under free-radical conditions by using arylazo sulfones as visible light photoinitiators. The process proceeds smoothly at room temperature...

scholarly journals Coumarins as Powerful Photosensitizers for the Cationic Polymerization of Epoxy-Silicones under Near-UV and Visible Light and Applications for 3D Printing Technology

Molecules ◽  
2020 ◽  
Vol 25 (9) ◽  
pp. 2063 ◽  
Author(s):  
Mira Abdallah ◽  
Akram Hijazi ◽  
Frédéric Dumur ◽  
Jacques Lalevée
Keyword(s):  
3D Printing ◽  
Visible Light ◽  
Blue Light ◽  
Laser Diode ◽  
Cationic Polymerization ◽  
High Performance ◽  
Printing Technology ◽  
3D Printing Technology ◽  
Visible Irradiation

In this study, eight coumarins (coumarins 1–8) are proposed as near-UV and blue light sensitive photoinitiators/photosensitizers for the cationic polymerization (CP) of epoxysilicones when combined with 4-isopropyl-4’-methyldiphenyliodonium tetrakis(pentafluorophenyl)borate (IOD). Among these coumarins, four of them (coumarins 1, 2, 6 and 8) have never been reported in the literature, i.e., these structures have been specifically designed to act as photoinitiators for silicones upon near UV and visible irradiation. Good final reactive epoxy function conversions (FCs) and also high rates of polymerization (Rp) were achieved in the presence of the newly proposed coumarin-based systems. The polymers generated from the photopolymerization of epoxysilicones can be considered as attractive candidates for several applications such as: elastomers, coatings, adhesives, and so on. The goal of this study focuses also on the comparison of the new proposed coumarins with well-established photosensitizers i.e., 1-chloro-4-propoxythioxanthone (CPTX), 9,10-dibutoxyanthracene (DBA) or some commercial coumarins (Com. Coum). As example of their high performance, the new proposed coumarins were also used for laser write experiments upon irradiation with a laser diode at 405 nm in order to develop new cationic 3D printing systems.

scholarly journals Synthesis of (Z)-Cinnamate Derivatives via Visible-Light-Driven E-to-Z Isomerization

SynOpen ◽  
2019 ◽  
Vol 03 (04) ◽  
pp. 103-107 ◽  
Author(s):  
Penghua Shu ◽  
Haichang Xu ◽  
Lingxiang Zhang ◽  
Junping Li ◽  
Hao Liu ◽  
...  
Keyword(s):  
Visible Light ◽  
Organic Synthesis ◽  
Blue Light ◽  
Large Scale ◽  
Practical Approach ◽  
Efficient Synthesis ◽  
Synthetic Methodology ◽  
Visible Light Driven ◽  
Large Scale Synthesis

(Z)-Cinnamate derivatives are prevalent in natural bioactive products and in organic synthesis. Herein, we report a practical approach toward the efficient synthesis of (Z)-cinnamate derivatives via visible-light-driven isomerization. When E-isomers of cinnamate derivatives were irradiated with blue light in the presence of 1 mol% Ir2(ppy)4Cl2 (ppy = 2-phenylpyridine), Z-isomers were readily obtained in good yields. This strategy allows the large-scale synthesis of (Z)-cinnamate derivatives with simple purification. This convenient, mild, and green synthetic methodology was subsequently applied to the synthesis of coumarins.

Sign in / Sign up

Export Citation Format

Share Document