Balance between Triplet States in Photoexcited Orthogonal BODIPY Dimers

被引：53

作者：

Kandrashkin, Yuri E. ^{[1
]}

Wang, Zhijia ^{[2
]}

Sukhanov, Andrei A. ^{[1
]}

Hou, Yuqi ^{[2
]}

Zhang, Xue ^{[2
]}

Liu, Ya ^{[2
]}

Voronkova, Violeta K. ^{[1
]}

Zhao, Jianzhang ^{[2
]}

机构：

[1] RAS, Zavoisky Phys Tech Inst, FRC Kazan Sci Ctr, Sibirsky Tract 10-7, Kazan 420029, Russia

[2] Dalian Univ Technol, Sch Chem Engn, State Key Lab Fine Chem, E-208 West Campus,2 Ling Gong Rd, Dalian 116024, Peoples R China

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2019年 / 10卷 / 15期

基金：

俄罗斯基础研究基金会;

关键词：

TIME-RESOLVED EPR; RADICAL-ION PAIRS; SINGLET OXYGEN; EXCITED-STATES; CHARGE RECOMBINATION; RATIONAL DESIGN; PHOTOSENSITIZERS; FLUORESCENCE; GENERATION; DERIVATIVES;

D O I：

10.1021/acs.jpclett.9b01741

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The intersystem crossing (ISC) and the triplet states in two representative BODIPY orthogonal dimers were studied with time-resolved electron paramagnetic resonance (TREPR) spectroscopy. The electron spin polarization (ESP) of the triplet state of the dimers, accessed with spin-orbit charge-transfer ISC, is different from that of the monomer (spin-orbit coupling-induced ISC). The TREPR spectra show that the triplet state initially formed by charge recombination is localized on either of two subunits, with different preference and ESP patterns. On the basis of the relative orientation of the respective zero field splitting principal axes, the T-x state on one subunit and the T-z state on another subunit in the dimer are overpopulated. The balance between the two triplet states is confirmed by the temperature dependency of the population ratio. No quintet state was detected with TREPR down to 20 K; thus, the recently proposed singlet fission ISC mechanism is excluded.

引用

页码：4157 / 4163

页数：13

共 45 条

[31]

Salikhov KM., 1984, Spin Polarization and Magnetic Effects in Radical Reactions

[32] Exploiting Charge-Transfer States for Maximizing Intersystem Crossing Yields in Organic Photoredox Catalysts [J].

Sartor, Steven M. ;

McCarthy, Blaine G. ;

Pearson, Ryan M. ;

Miyake, Garret M. ;

Damrauer, Niels H. .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2018, 140 (14) :4778-4781

[33] Precise determination of the orientation of the transition dipole moment in a Bodipy derivative by analysis of the magnetophotoselection effect [J].

Toffoletti, Antonio ;

Wang, Zhijia ;

Zhao, Jianzhang ;

Tommasini, Matteo ;

Barbon, Antonio .

PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 2018, 20 (31) :20497-20503

[34] Near-IR Absorbing BODIPY Derivatives as Glutathione-Activated Photosensitizers for Selective Photodynamic Action [J].

Turan, Ilke Simsek ;

Cakmak, Fatma Pir ;

Yildirim, Deniz Cansen ;

Cetin-Atalay, Rengul ;

Akkaya, Engin U. .

CHEMISTRY-A EUROPEAN JOURNAL, 2014, 20 (49) :16088-16092

[35]

Turro N. J., 2009, Principles of Molecular Photochemistry: An Introduction

[36] Time-resolved EPR study of photoexcited triplet-state formation in electron-donor-substituted acridinium ions [J].

vanWilligen, H ;

Jones, G ;

Farahat, MS .

JOURNAL OF PHYSICAL CHEMISTRY, 1996, 100 (09) :3312-3316

[37] Insights into the Efficient Intersystem Crossing of Bodipy-Anthracene Compact Dyads with Steady-State and Time-Resolved Optical/Magnetic Spectroscopies and Observation of the Delayed Fluorescence [J].

Wang, Zhijia ;

Sukhanov, Andrey A. ;

Toffoletti, Antonio ;

Sadiq, Farhan ;

Zhao, Jianzhang ;

Barbon, Antonio ;

Voronkova, Violeta K. ;

Dick, Bernhard .

JOURNAL OF PHYSICAL CHEMISTRY C, 2019, 123 (01) :265-274

[38] Increasing the anti-Stokes shift in TTA upconversion with photosensitizers showing red-shifted spin-allowed charge transfer absorption but a non-compromised triplet state energy level [J].

Wang, Zhijia ;

Zhao, Jianzhang ;

Di Donato, Mariangela ;

Mazzone, Gloria .

CHEMICAL COMMUNICATIONS, 2019, 55 (10) :1510-1513

[39] Bodipy-Anthracene Dyads as Triplet Photosensitizers: Effect of Chromophore Orientation on Triplet-State Formation Efficiency and Application in Triplet-Triplet Annihilation Upconversion [J].

Wang, Zhijia ;

Zhao, Jianzhang .

ORGANIC LETTERS, 2017, 19 (17) :4492-4495

[40] Transient EPR [J].

Weber, Stefan .

eMagRes, 2017, 6 (02) :255-270

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