Journal ArticleDOI
Electron spin dynamics in excited state photochemistry: recent development in the study of intersystem crossing and charge transfer in organic compounds
Muhammad Imran,Xue Zhang,Zhijia Wang,Xi Chen,Jianzhang Zhao,Antonio Barbon,Violeta K. Voronkova +6 more
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TLDR
In this article, the electron spin dynamics in organic molecular systems are discussed, including electron-spin selective intersystem crossing (ISC) as well as charge separation (CS) and charge recombination (CR) of the organic molecular system.Abstract:
Electron spin dynamics are crucial to photochemical and photophysical processes. However, to a large extent, they are neglected in routine photochemistry studies. Herein, we summarized the recent developments of electron spin dynamics in organic molecular systems. The electron-spin selective intersystem crossing (ISC) as well as charge separation (CS) and charge recombination (CR) of the organic molecular system are discussed, including ISC of the compounds with twisted π-conjugation frameworks and CR-induced ISC in compact orthogonal electron donor–acceptor dyads. We found that the electron spin polarization (ESP) of the triplet state formed in these systems is highly dependent on the molecular structure and geometry. The zero-field-splitting (ZFS) D and E parameters of the triplet state of series chromophores determined with time-resolved electron paramagnetic resonance (TREPR) spectroscopy are presented. Some unanswered questions in related areas are raised, which may inspire further theoretical investigations. The examples demonstrate that the study of electron spin dynamics is not only important in fundamental photochemistry to attain in-depth understanding of the ISC and the charge transfer processes, but is also useful for designing new efficient organic molecular materials for applications including photodynamic therapy, organic light-emitting diodes, and photon upconversion.read more
Citations
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Journal ArticleDOI
Charge Transfer, Intersystem Crossing, and Electron Spin Dynamics in a Compact Perylenemonoimide-Phenoxazine Electron Donor-Acceptor Dyad.
Huaiman Cao,Ivan V. Kurganskii,Junhong Pang,Ruomeng Duan,Jianzhang Zhao,Matvey V. Fedin,Ming-De Li,Chen Li +7 more
TL;DR: In this article, the spin-orbit charge transfer-induced intersystem crossing (SOCT-ISC) was studied in the orthogonal electron donor-acceptor dyad with phenoxazine (PXZ) and perylene-3,4-dicarboximide (PMI) as the electron acceptor.
Journal ArticleDOI
Application of time-resolved electron paramagnetic resonance spectroscopy in the mechanistic study of thermally activated delayed fluorescence (TADF) materials
Xi Chen,Xiao Xiao,Jianzhang Zhao +2 more
TL;DR: Triplet exciton harvesting is crucial in organic light emitting diodes (OLEDs) because the triplet states produced by electron and hole recombination is up to 75% of the total excitons as mentioned in this paper .
Journal ArticleDOI
Charge Separation and Intersystem Crossing in Homo- and Hetero-Compact Naphthalimide Dimers.
Wen-Ting Tian,A. A. Sukhanov,Laura Bussotti,Junhong Pang,Jianzhang Zhao,Violeta K. Voronkova,Mariangela Di Donato,Ming-De Li +7 more
TL;DR: In this paper , photo-induced symmetry-breaking charge transfer (SBCT) and charge recombination (CR)-induced intersystem crossing (ISC) were studied for homo-dimer homo and hetero-dimers.
Book ChapterDOI
Light-induced pulsed dipolar EPR spectroscopy for distance and orientation analysis.
TL;DR: Light-induced pulsed dipolar spectroscopy (LiPDS) as mentioned in this paper has been proposed to measure the electron spin-spin dipolar interaction, therefore they require the presence of at least two paramagnetic centers, which are often stable radicals.
Journal ArticleDOI
Modulating the intersystem crossing mechanism of anthracene carboxyimide-based photosensitizers via structural adjustments and application as a potent photodynamic therapeutic reagent.
Hui Liang,Liting Tang,Jiaxing He,Jianqing Li,Zeduan Chen,Shuqing Cai,Junhong Pang,Zafar Mahmood,Wen-Cheng Chen,Ming-De Li,Zujin Zhao,Yanping Huo,Shaomin Ji +12 more
TL;DR: In this paper , a series of compact anthracene carboxyimide (ACI) based donor-acceptor dyads were prepared by substituting bulky aryl donor moieties with various electron-donating ability to study the triplet-excited state properties.
References
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