scholarly journals Orthogonally Aligned Cyclic BODIPY Arrays with Long-lived Triplet Excited States as Efficient Heavy-Atom-Free Photosensitizers

2021 ◽  
Author(s):  
Zhaoyang Zhu ◽  
Xue Zhang ◽  
Xing Guo ◽  
Qing-Hua Wu ◽  
Zhongxin Li ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Energy Transfer ◽  
Excited State ◽  
Excited States ◽  
Heavy Atom ◽  
Triplet Excited State ◽  
Transfer Processes ◽  
Excited State Lifetimes ◽  
Triplet Excited States

Photosensitizers with long triplet excited state lifetimes are key to their efficient electron transfer or energy transfer processes. Herein, we report a novel class of cyclic trimeric BODIPY arrays which...

Preparation of Bodipy–ferrocene dyads and modulation of the singlet/triplet excited state of bodipy via electron transfer and triplet energy transfer

2016 ◽  
Vol 4 (14) ◽  
pp. 2843-2853 ◽  
Author(s):  
Xueyan Wu ◽  
Wenting Wu ◽  
Xiaoneng Cui ◽  
Jianzhang Zhao ◽  
Mingbo Wu
Keyword(s):  
Electron Transfer ◽  
Energy Transfer ◽  
Excited State ◽  
Excited States ◽  
Singlet Excited State ◽  
Triplet Excited State ◽  
Triplet Energy ◽  
Triplet Excited States ◽  
Triplet Energy Transfer

Bodipy–ferrocene dyads were prepared for reversible electrochemical switching of the singlet excited state (fluorescence), as well as the triplet excited states of Bodipy.

Some triplet energy-transfer reactions initiated by photoexcitation of triplet excited state of dibenz[a,h]anthracene to the higher triplet excited states

2003 ◽  
Vol 44 (32) ◽  
pp. 6117-6120 ◽  
Author(s):  
Xichen Cai ◽  
Michihiro Hara ◽  
Kiyohiko Kawai ◽  
Sachiko Tojo ◽  
Mamoru Fujitsuka ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Excited State ◽  
Excited States ◽  
Transfer Reactions ◽  
Triplet Excited State ◽  
Triplet Energy ◽  
Triplet Excited States ◽  
Triplet Energy Transfer

Competitive Marcus-Type Electron Transfer and Energy Transfer from the Higher Triplet Excited State

2004 ◽  
Vol 108 (50) ◽  
pp. 10941-10948 ◽  
Author(s):  
Masanori Sakamoto ◽  
Xichen Cai ◽  
Michihiro Hara ◽  
Sachiko Tojo ◽  
Mamoru Fujitsuka ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Energy Transfer ◽  
Excited State ◽  
Triplet Excited State

Studies of energy-transfer and electron-transfer processes involving the 3A2u excited states of binuclear rhodium isocyanide complexes

1980 ◽  
Vol 102 (22) ◽  
pp. 6761-6764 ◽  
Author(s):  
Steven J. Milder ◽  
Robert A. Goldbeck ◽  
David S. Kliger ◽  
Harry B. Gray
Keyword(s):  
Electron Transfer ◽  
Energy Transfer ◽  
Excited States ◽  
Transfer Processes ◽  
Electron Transfer Processes

scholarly journals Divergent Photocatalytic Reactions of α-Ketoesters Under Triplet Sensitization and Photoredox Conditions

2020 ◽  
Author(s):  
Jian Zheng ◽  
Xiao Dong ◽  
Tehshik Yoon
Keyword(s):  
Electron Transfer ◽  
Energy Transfer ◽  
Transition Metal ◽  
Excited States ◽  
Reactive Intermediates ◽  
Organic Substrates ◽  
Reaction Conditions ◽  
Electron Transfer Pathways ◽  
Photocatalytic Reactions ◽  
Triplet Excited States

The long-lived triplet excited states of transition metal photocatalysts can activate organic substrates via either energy- or electron-transfer pathways, and the rates of these processes can be influenced by rational tuning of the reaction conditions. The characteristic reactive intermediates that are generated by each of these activation modalities, however, are distinct and can exhibit very different reactivity patterns. Herein, we show that the photocatalytic reactions of benzoylformate esters with alkenes can be directed towards either Paternò–Büchi cycloadditions under conditions that favor energy transfer or allylic functionalization reactions under superficially similar conditions that favor electron transfer. These studies provide a framework for designing other divergent photocatalytic methods that produce different sets of reaction outcomes under photoredox and triplet sensitization conditions.

scholarly journals Bifurcation of excited state trajectories toward energy transfer or electron transfer directed by wave function symmetry

2021 ◽  
Vol 118 (4) ◽  
pp. e2018521118
Author(s):  
Paola S. Oviedo ◽  
Luis M. Baraldo ◽  
Alejandro Cadranel
Keyword(s):  
Electron Transfer ◽  
Wave Function ◽  
Energy Transfer ◽  
Excited State ◽  
Excited States ◽  
Transient Absorption ◽  
Transient Absorption Spectroscopy ◽  
Differential Behavior ◽  
Donor Acceptor ◽  
Kinetic Barriers

This work explores the concept that differential wave function overlap between excited states can be engineered within a molecular chromophore. The aim is to control excited state wave function symmetries, so that symmetry matches or mismatches result in differential orbital overlap and define low-energy trajectories or kinetic barriers within the excited state surface, that drive excited state population toward different reaction pathways. Two donor–acceptor assemblies were explored, where visible light absorption prepares excited states of different wave function symmetry. These states could be resolved using transient absorption spectroscopy, thanks to wave function symmetry-specific photoinduced optical transitions. One of these excited states undergoes energy transfer to the acceptor, while another undertakes a back-electron transfer to restate the ground state. This differential behavior is possible thanks to the presence of kinetic barriers that prevent excited state equilibration. This strategy can be exploited to avoid energy dissipation in energy conversion or photoredox catalytic schemes.

Energy transfer in diiodoBodipy-grafted upconversion nanohybrids

Nanoscale ◽  
2016 ◽  
Vol 8 (1) ◽  
pp. 204-208 ◽  
Author(s):  
Laura Francés-Soriano ◽  
Marta Liras ◽  
Agnieszka Kowalczyk ◽  
Artur Bednarkiewicz ◽  
Maria González-Béjar ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Excited State ◽  
Excited States ◽  
Transfer Processes

The Yb3+ excited state can decay via two competitive energy transfer processes: sensitization of IBDP after absorption of a second NIR photon and population of Er3+ excited states.

scholarly journals Tuning the singlet-triplet energy gap: a unique approach to efficient photosensitizers with aggregation-induced emission (AIE) characteristics

2015 ◽  
Vol 6 (10) ◽  
pp. 5824-5830 ◽  
Author(s):  
Shidang Xu ◽  
Youyong Yuan ◽  
Xiaolei Cai ◽  
Chong-Jing Zhang ◽  
Fang Hu ◽  
...  
Keyword(s):  
Excited State ◽  
Excited States ◽  
Energy Gap ◽  
Intersystem Crossing ◽  
Triplet Excited State ◽  
Triplet Energy ◽  
Aggregation Induced Emission ◽  
Unique Approach ◽  
Triplet Excited States

The efficiency of the intersystem crossing process can be improved by reducing the energy gap between the singlet and triplet excited states (ΔEST), which offers the opportunity to improve the yield of the triplet excited state.

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