Results 91 to 100 of about 9,652 (250)

Efficient Green Light‐Induced Photoclick Reactions Enabled by Triplet–Triplet Annihilation Photon Upconversion

Angewandte Chemie, EarlyView.
A general strategy for 9,10‐phenanthrenequinone‐electron‐rich alkene (PQ‐ERA) photoclick reactions via triplet–triplet annihilation upconversion (TTA‐UC) under low‐intensity green light is reported. A TTA‐UC system of PdOEP (sensitizer) and DPA (annihilator) mixed with reactants generates UV/blue photons overlapping the absorption of PQ derivatives ...
Qingxin Luan, Mei Sang, Yuxin He, Hao Yang, Anna M. Doze, Lili Hou, Youxin Fu, Ben L. Feringa   +7 more
wiley   +2 more sources

Extending El Sayed's Rule by 1(n,π*)–3(n,π*) Rotation via Intramolecular Secondary Interaction Enables Room‐Temperature Circularly Polarized Phosphorescence in Solution

Angewandte Chemie, EarlyView.
Weak but skilled: Our results highlight the crucial role of intramolecular secondary interactions to induce an efficient ISC between formally identical 1(n,π*) and 3(n,π*) states in chiral thionated phthalimide derivatives. This unprecedented type of inter‐system crossing (ISC) extends the usual thinking of the El‐Sayed principle and enables the ...
Oscar Charpentier, Marie Guesdon, Catherine Demangeat, Maher Hojorat, Joseph Young, Emrys W. Evans, Vincent Dorcet, Nicolas Galland, Denis Jacquemin, Ludovic Favereau   +9 more
wiley   +2 more sources

Oxygen‐Tolerant, Controlled Synthesis of Degradable and Water‐Soluble Poly(Vinyl Amide)s via Radical Ring‐Opening Copolymerization of Cyclic Dithiothreitol

Angewandte Chemie, EarlyView.
Oxygen‐tolerant photoinduced electron/energy transfer reversible addition–fragmentation chain transfer (PET‐RAFT) polymerization enables the controlled radical ring‐opening (rROP) copolymerization of cyclic dithiothreitol (cDTT) with less‐activated vinyl monomers, affording degradable polymers with predictable molecular weights, low dispersities, and ...
Alessandro Magro, Ivan O. Levkovsky, Hironobu Murata, Francesca Lorandi, Edmondo M. Benetti, Krzysztof Matyjaszewski   +5 more
wiley   +2 more sources

Beyond Radical Emitters: Hot‐Exciton Electroluminescence From Singlet Diradicaloids

Angewandte Chemie, EarlyView.
The first hot‐exciton mechanism in a singlet diradicaloid is demonstrated in a polychlorinated Thiele hydrocarbon‐based organic light‐emitting transistor. Reverse intersystem crossing involving the T2 and bright singly excited states enables electroluminescence beyond the 25% spin‐statistical limit, leading to remarkable external quantum efficiency ...
Mario Prosa, Eugenio Lunedei, Michele Orza, Davide Mesto, Roberto Cantoni, Francesco Reginato, Angela Punzi, Arthur R. J. Barreto, Yasi Dai, Benedetta Carlotti, Fabrizia Negri, Stefano Toffanin, Davide Blasi   +12 more
wiley   +1 more source

Anti-solvatochromic fluorescence enhancement via the suppression of S1-T2 intersystem crossing by polarity

Next Materials
Attenuated fluorescence of organic fluorescent probes is typically observed in hydrophilic environments due to solvatochromic fluorescence quenching, where the brightness decreases along with increasing solvent polarity.
Hao Li, Juanjuan Zhang, Yue-Tong Fang, Yu-Min Wang, Gui-Yuan Wu, Zhenggang Lan, Zhou Lu   +6 more
doaj   +1 more source

Facile Synthetic Access Towards Sulfur- and Selenium-Functionalized Boron-Based Multiresonance TADF Emitters

Molecules
Thermally activated delayed fluorescence (TADF) materials with high photoluminescence quantum yields and a fast reverse intersystem crossing (RISC) are of the highest interest for organic light-emitting diodes (OLEDs). In the past decade, triaryl boranes
Zeynep Güven, Hadi Dolati, Leo Wessel, René Frank   +3 more
doaj   +1 more source

Near Infrared Photoswitching by Direct Excitation—A Next Frontier

Angewandte Chemie International Edition, EarlyView.
Molecular photoswitches finally enter the spectral realm of near‐infrared for their direct excitation. This minireview summarizes the current state‐of‐the‐art, the design principles for achieving such low‐energy light responsiveness, and the unique applications that are unlocked by it.
Diptiprava Sahoo, Elias Ciekalski, Henry Dube   +2 more
wiley   +1 more source

Reverse intersystem crossing mechanisms in doped triangulenes

Physical Chemistry Chemical Physics
Electronic structure calculations suggest that reverse intersystem crossing in B and N-doped triangulenes can occur via both direct (spin–orbit coupling) and mediated (spin–vibronic coupling) mechanisms.
Asier E. Izu, Jon M. Matxain, David Casanova   +2 more
openaire   +3 more sources

Activation of Metal Complexes With Ultrasound Waves for Targeted Anticancer Therapy

Angewandte Chemie International Edition, EarlyView.
Ultrasound enables non‐invasive activation of metal‐based therapeutics deep within tumors. Acoustic cavitation can drive sonodynamic reactive oxygen species generation or mechanochemical metal–ligand bond dissociation, enabling controlled release of bioactive payloads.
Félix Grosjean, Nicolás Montesdeoca, Gilles Berger, Johannes Karges   +3 more
wiley   +1 more source

Atomic‐iodine‐substituted polydiacetylene nanospheres with boosted intersystem crossing and nonradiative transition through complete radiative transition blockade for ultraeffective phototherapy

Aggregate
The energy dissipation pathways of a photosensitizer for phototherapies, including photodynamic therapy (PDT) and photothermal therapy (PTT), compete directly with that of its fluorescence (FL) emission.
Dan Zhao, Lingling Zhang, Mingming Yin, Zhenyan He, Fang Fang, Minle Zhan, Sidan Tian, Fanling Meng, Liang Luo   +8 more
doaj   +1 more source