Article
Chemistry, Multidisciplinary
Cherumannil Femina, M. Shanthil, Pookkottu K. Sajith, Reji Thomas
Summary: This study reports the synthesis and photophysical properties of donor-acceptor systems based on anthracene and cyanostilbene, showing strong emission in solution due to intramolecular charge transfer (ICT). CSB-1 demonstrated a stimuli responsive dual mode luminescence switching under applied stress and ethyl acetate vapours. Furthermore, CSB-1 showed a higher quantum yield in the solid state compared to CSB-2 due to its rigid molecular packing.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Chemistry, Physical
Wei Zhang, Wenqi Xu, Guoxian Zhang, Jie Kong, Xinmiao Niu, Julian M. W. Chan, Weimin Liu, Andong Xia
Summary: In this study, the intramolecular charge delocalization/localization of a newly synthesized acceptor-donor-acceptor molecule was intensively investigated using femtosecond stimulated Raman scattering and femtosecond transient absorption spectroscopy. The nature of the relaxed S-1 state was found to be strongly influenced by solvent polarity, with symmetric delocalized intramolecular charge transfer characters occurring in apolar solvent and asymmetric localized ICT characters appearing in polar solvent due to solvation. The solvation dynamics extracted from fs-TA were consistent with the time constants obtained by FSRS, but FSRS clearly tracked the excited state intramolecular charge transfer delocalization/localization.
JOURNAL OF PHYSICAL CHEMISTRY B
(2021)
Article
Physics, Atomic, Molecular & Chemical
Zhengxin Wang, Jiaming Jiang, Yifan Huang, Weimin Liu
Summary: The study investigates how solvent environments affect the mechanism of molecular rotors. By using experimental and computational methods, it is found that the molecule undergoes rotation in the excited state and dissipates energy through two non-radiative decay channels. The polarity of the solvent influences the rotation of the molecule and energy transfer.
CHINESE JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Jianzhang Zhao, Violeta K. Voronkova, Mariangela Di Donato, Xi Chen, Andrey A. Sukhanov, Maria Taddei, Bernhard Dick
Summary: In this study, three anthracene-naphthalenediimide electron donor-acceptor dyads were synthesized, and their photophysical properties and triplet state behavior were investigated using femtosecond transient absorption and nanosecond transient absorption techniques. The results show that the dyads exhibit fast charge separation and relatively slow charge recombination upon photoexcitation, with the dyads containing an intervening phenyl linker showing unusually slow triplet-triplet energy transfer rates. Time-resolved electron paramagnetic resonance spectroscopy confirms that the intersystem crossing mechanism for all the dyads is spin orbit charge transfer intersystem crossing.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Xi Chen, Andrey A. Sukhanov, Maria Taddei, Bernhard Dick, Jianzhang Zhao, Violeta K. Voronkova, Mariangela Di Donato
Summary: Fast charge separation and relatively slow charge recombination processes were studied in three anthracene-naphthalenediimide compact electron donor-acceptor dyads using femtosecond transient absorption and nanosecond transient absorption spectroscopy. Triplet-triplet energy transfer and intersystem crossing mechanisms were also investigated.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Hong-Cheng Li, Xun Tang, Sheng-Yi Yang, Yang-Kun Qu, Zuo-Quan Jiang, Liang-Sheng Liao
Summary: By binding D/A units in space and controlling their interaction, intramolecular charge transfer is achieved which enhances the emission properties of the material. The DM-Me-B material exhibits high external quantum efficiency and low efficiency roll-off.
CHINESE CHEMICAL LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Peihui Li, Wan Xiong, Jinying Wang, Jie Hao, Mingpeng Li, Boyu Wang, Yijian Chen, Wei Si, Haiyang Ren, Guangwu Li, Yongsheng Chen, Jingtao Lu, Hongtao Zhang, Chuancheng Jia, Xuefeng Guo
Summary: The electronic characteristics of organic optoelectronic materials play a crucial role in determining the performance of related devices, particularly in organic photovoltaics. This study investigates a typical acceptor-donor-acceptor (A-D-A)-type molecule to understand its inherent electronic characteristics at the single-molecule level. The presence of 1,1-dicyano methylene-3-indanone (INCN) acceptor units in the A-D-A-type molecule enhances its conductance in single-molecule junctions by providing additional transport channels. Protonation-induced conformational changes allow for detection of charge transport in the central part of the D unit, confirming that the conductive orbitals contributed by the INCN acceptor groups can penetrate the entire A-D-A molecule. These findings offer important insights for the development of high-performance organic optoelectronic materials and devices for practical applications.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Applied
Xiaoyu Zhao, Ivan Kurganskii, Ayhan Elmali, Jianzhang Zhao, Ahmet Karatay, Gloria Mazzone, Matvey Fedin
Summary: A series of compact coumarin-anthracene donor-acceptor dyads were synthesized to investigate the relationship between molecular configuration, electronic coupling, and intersystem crossing (ISC) efficiency. The results showed that the orthogonal geometry of the dyads was beneficial to the spin-orbit charge transfer ISC (SOCT-ISC) mechanism. Singlet oxygen quantum yields were solvent polarity-dependent, and the orthogonal dyads exhibited higher yields compared to the coplanar dyad. Transient absorption spectra revealed different localized and delocalized triplet states in the dyads, with varied lifetimes. Time-resolved electron paramagnetic resonance (TREPR) spectra confirmed the involvement of the SOCT-ISC mechanism in orthogonal dyads, while both SOCT-ISC and spin-orbit ISC (SO-ISC) mechanisms contributed to the triplet state formation in the coplanar dyad. The electron spin polarization (ESP) pattern of the triplet states depended on not only the molecular geometry but also the electron donor and acceptor structure.
Article
Chemistry, Analytical
Steven A. Diaz, David W. Mccamant
Summary: By improving the collection optics, we have developed two new diffuse reflectance-based femtosecond stimulated Raman spectroscopy (drFSRS) techniques for collecting Raman spectra of opaque systems. The experimental results demonstrate the current capabilities of collecting high-quality Raman spectra using drFSRS.
ANALYTICAL CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Shanshan Wang, Yinhui Li, Yu Fu, Xiaoyu Li, Chunhui Tao, Wenxiang Zhang, Heping Ma
Summary: A porous organic framework with well-defined donor-acceptor units, called D-A-POF, has been synthesized successfully. The intramolecular donor-acceptor interactions induce a localized electric field gradient at the pore surface, giving D-A-POF excellent desulfurization capabilities.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Energy & Fuels
Bin-Wen Chen, Piao-Yang Xu, Si-Hao Chen, Ke Luan, Zhen-Lin Qiu, Lu Wang, Le-Shan Dai, Yun-Fei Li, Da-Qin Yun, Lin-Long Deng, Su-Yuan Xie, Lan-Sun Zheng
Summary: Three novel donor-acceptor-acceptor small molecules with benzotriazole as the central building block are synthesized and investigated for their molecular structure, electrochemical behavior, and optical properties. Vacuum-deposited small-molecule organic solar cells (SMOSCs) fabricated with these molecules and C-70 as the acceptor exhibit power conversion efficiencies (PCEs) in the range of 6.42-7.43%. One of the molecules shows a promising PCE of 14.84% under indoor illumination, demonstrating its potential in indoor photovoltaic applications.
Article
Chemistry, Physical
J. Terence Blaskovits, Maria Fumanal, Sergi Vela, Raimon Fabregat, Clemence Corminboeuf
Summary: This study identifies the trade-off between the main requirements of the donor-acceptor strategy for iSF and formulates design rules for tuning them simultaneously in a fragment-based approach. Simple guidelines to build promising novel materials for iSF are established based on a library of 2944 donor-acceptor copolymers. Systems containing benzothiadiazole and thiophene-1,1-dioxide acceptors have been shown to fulfill all criteria for iSF simultaneously when paired with appropriate donors, making them highly promising candidates in the quest for iSF materials.
CHEMISTRY OF MATERIALS
(2021)
Article
Engineering, Environmental
Xiaofang Wei, Taiping Hu, Zhiyi Li, Yanwei Liu, Xiaoxiao Hu, Honglei Gao, Guanhao Liu, Pengfei Wang, Yuanping Yi, Ying Wang
Summary: This article proposes a rational strategy to construct exciplexes with thermally activated delayed fluorescence (TADF), addressing the issue of low quantum yields of exciplex-type chromophores. By adjusting the structure of carbazole-based molecules, high efficiency and low driving voltage of green exciplex OLED can be achieved.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Fabian Weber, Hirotoshi Mori
Summary: Following a report on the importance of intramolecular hydrogen bonds in improving NIR-TADF efficiency in CAT-1, a study was conducted to compare the performance of intramolecular doubly hydrogen-bonded base design to singly and non-bonded derivatives. The results showed that the structures with more intramolecular hydrogen bonds have lower internal reorganization energies. Additionally, the proposed base design allows for interlocking of charge transfer donor-, linker- and acceptor-planes through steric gauche-interactions, enabling the trapping of smaller heterocyclic linkers.
Article
Physics, Multidisciplinary
Dingwei Chu, Haizhen Yu, Li Wang, Chuan-Kui Wang, Yuzhi Song, Zhen Xie
Summary: The excited states of donor-acceptor molecules play a crucial role in various applications, but they are difficult to characterize using conventional experimental techniques. Resonance tip-enhanced Raman scattering images provide a clear identification of these excited states and serve as a benchmark for evaluating the accuracy of different functionals in describing charge-transfer systems. These findings expand the use of resonance Raman images in the characterization and improvement of functional donor-acceptor molecular materials.
Article
Chemistry, Multidisciplinary
Ryan M. Young, Stephen C. Jensen, Kedy Edme, Yilei Wu, Matthew D. Krzyaniak, Nicolaas A. Vermeulen, Edward J. Dale, J. Fraser Stoddart, Emily A. Weiss, Michael R. Wasielewski, Dick T. Co
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2016)
Article
Chemistry, Multidisciplinary
Duncan Hieu M. Dam, Jung Heon Lee, Patrick N. Sisco, Dick T. Co, Ming Zhang, Michael R. Wasielewski, Teri W. Odom
Article
Chemistry, Multidisciplinary
Scott M. Dyar, Jonathan C. Barnes, Michal Juricek, J. Fraser Stoddart, Dick T. Co, Ryan M. Young, Michael R. Wasielewski
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2014)
Article
Chemistry, Multidisciplinary
Maher Fathalla, Jonathan C. Barnes, Ryan M. Young, Karel J. Hartlieb, Scott M. Dyar, Samuel W. Eaton, Amy A. Sarjeant, Dick T. Co, Michael R. Wasielewski, J. Fraser Stoddart
CHEMISTRY-A EUROPEAN JOURNAL
(2014)
Article
Chemistry, Physical
Michael T. Colvin, Annie Butler Ricks, Amy M. Scott, Dick T. Co, Michael R. Wasielewski
JOURNAL OF PHYSICAL CHEMISTRY A
(2012)
Article
Chemistry, Physical
Ryan M. Young, Scott M. Dyar, Jonathan C. Barnes, Michal Juricek, J. Fraser Stoddart, Dick T. Co, Michael R. Wasielewski
JOURNAL OF PHYSICAL CHEMISTRY A
(2013)
Article
Chemistry, Physical
Kristen E. Brown, Brad S. Veldkamp, Dick T. Co, Michael R. Wasielewski
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2012)
Article
Chemistry, Physical
Kelly M. Lefler, Dick T. Co, Michael R. Wasielewski
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2012)
Article
Chemistry, Multidisciplinary
Victoria L. Gunderson, Amanda L. Smeigh, Chul Hoon Kim, Dick T. Co, Michael R. Wasielewski
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2012)
Article
Chemistry, Multidisciplinary
Annie Butler Ricks, Kristen E. Brown, Matthias Wenninger, Steven D. Karlen, Yuri A. Berlin, Dick T. Co, Michael R. Wasielewski
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2012)
Article
Chemistry, Multidisciplinary
Hao Li, Chuyang Cheng, Paul R. McGonigal, Albert C. Fahrenbach, Marco Frasconi, Wei-Guang Liu, Zhixue Zhu, Yanli Zhao, Chenfeng Ke, Juying Lei, Ryan M. Young, Scott M. Dyar, Dick T. Co, Ying-Wei Yang, Youssry Y. Botros, William A. Goddard, Michael R. Wasielewski, R. Dean Astumian, J. Fraser Stoddart
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2013)
Article
Nanoscience & Nanotechnology
Wei Zhou, Montacer Dridi, Jae Yong Suh, Chul Hoon Kim, Dick T. Co, Michael R. Wasielewski, George C. Schatz, Teri W. Odom
NATURE NANOTECHNOLOGY
(2013)
Article
Physics, Multidisciplinary
Daniel C. Hannah, Kristen E. Brown, Ryan M. Young, Michael R. Wasielewski, George C. Schatz, Dick T. Co, Richard D. Schaller
PHYSICAL REVIEW LETTERS
(2013)
Article
Multidisciplinary Sciences
Michael T. Vagnini, Amanda L. Smeigh, James D. Blakemore, Samuel W. Eaton, Nathan D. Schley, Francis D'Souza, Robert H. Crabtree, Gary W. Brudvig, Dick T. Co, Michael R. Wasielewski
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2012)
Article
Instruments & Instrumentation
M. E. Thurlow, D. T. Co, A. S. O'Brien, R. A. Hannun, L. B. Lapson, T. F. Hanisco, J. G. Anderson
REVIEW OF SCIENTIFIC INSTRUMENTS
(2014)