Thiophene Derivatives with Donor-π-Acceptor Structures for Enhanced Light-Absorption Properties and Efficient Cationic Polymerization upon Green-Light Irradiation

A high performance phenyl-free LED photoinitiator for cationic or hybrid photopolymerization and its application in LED cationic 3D printing

In this work, a high performance LED photoinitiator, 1,3-bis(1-methyl-1H-pyrrol-2-yl)prop-2-en-1-one (BMO), without a benzene ring was synthesized through a one-step aldehyde–ketone condensation reaction.

New violet to yellow light sensitive diketo pyrrolo–pyrrole photoinitiators: high performance systems with unusual bleaching properties and solubility in water

New high performance photoinitiating systems for visible light exhibiting excellent bleaching properties and water solubility are proposed.

Photoinduced Electron Transfer Reactions for Macromolecular Syntheses

Photochemical reactions, particularly those involving photoinduced electron transfer processes, establish a substantial contribution to the modern synthetic chemistry, and the polymer community has been increasingly interested in exploiting and developing novel photochemical strategies. These reactions are efficiently utilized in almost every aspect of macromolecular architecture synthesis, involving initiation, control of the reaction kinetics and molecular structures, functionalization, and decoration, etc. Merging with polymerization techniques, photochemistry has opened up new intriguing and powerful avenues for macromolecular synthesis. Construction of various polymers with incredibly complex structures and specific control over the chain topology, as well as providing the opportunity to manipulate the reaction course through spatiotemporal control, are one of the unique abilities of such photochemical reactions. This review paper provides a comprehensive account of the fundamentals and applications of photoinduced electron transfer reactions in polymer synthesis. Besides traditional photopolymerization methods, namely free radical and cationic polymerizations, step-growth polymerizations involving electron transfer processes are included. In addition, controlled radical polymerization and "Click Chemistry" methods have significantly evolved over the last few decades allowing access to narrow molecular weight distributions, efficient regulation of the molecular weight and the monomer sequence and incredibly complex architectures, and polymer modifications and surface patterning are covered. Potential applications including synthesis of block and graft copolymers, polymer-metal nanocomposites, various hybrid materials and bioconjugates, and sequence defined polymers through photoinduced electron transfer reactions are also investigated in detail.

Branched and linear A2–D–A1–D–A2isoindigo-based solution-processable small molecules for organic field-effect transistors and solar cells

A₂–D–A₁–D–A₂type small molecules were synthesized, providing a solar cell efficiency of 1.9% and hole mobility of 3.7 × 10⁻³cm²V⁻¹s⁻¹.

One/two-photon-sensitive photoacid generators based on benzene oligomer-containing D–π–A-type aryl dialkylsulfonium salts

D–π–A type photoacid generators with a benzene-oligomer as π-conjugated systems show high photoacid generation efficiency (Φ_H+max > 0.7) and good photoinitiated polymerization abilities by 365 nm and 780 nm excitation.