Article
Chemistry, Applied
Bo Fu, Yuanyuan Che, Xuemei Yuan, Lei Sun, Haijun Xu, Jianzhang Zhao, Lang Liu
Summary: Triplet photosensitizers T-P-Co and T-C-60-P-Co were synthesized and used for triplet-triplet annihilation upconversion with efficient energy transfer and high quantum yields observed. Electrochemical investigation revealed thermodynamic limitations for photo-induced electron transfer in toluene, while nanosecond time-resolved experiments showed triplet excited states distributed on the corrole moiety.
Article
Optics
Ines G. Tavares, Erki Enkvist, Joosep Kaimre, Asko Uri, Fernando B. Dias
Summary: This work investigates the intramolecular energy transfer between two thiophene donors and a perylene bisimide acceptor, demonstrating the transfer of energy from the thiophene donor's excited triplet state to the perylene bisimide acceptor's singlet state. The designed organic luminophore, ARC-1467, shows delayed fluorescence of perylene bisimide upon excitation of the donor unit, indicating the occurrence of energy transfer from the triplet state of the donor unit to the perylene bisimide acceptor.
JOURNAL OF LUMINESCENCE
(2021)
Article
Chemistry, Multidisciplinary
S. Hou, Y. Li, J. Yang, Y. Wang, H. Lin, S. Chen, J. Zhou, S. Zhuo, Y. Liu, Y. Wu
Summary: A triplet energy transfer (TET) system based on PBI-FN and PbS quantum dots (QDs) with different sizes was constructed and the TET kinetics between PBI-FN ligands and PbS QDs were investigated. The energy transfer process from PBI-FN to PbS QDs was successfully realized by controlling the TET driving forces using PbS QDs with different band gaps. The attenuation of various paths in the TET system is a complex photophysical process, and this work provides guidance for the design of TET systems from the perspective of dynamics.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Chemistry, Organic
Takumi Wada, Yoshimitsu Tachi, Kazuo Toyota, Masatoshi Kozaki
Summary: A dyad of platinum octaethylporphyrin (PtOEP)-diphenylanthracene (DPA) with an ethynylene linker was synthesized. The emission from PtOEP in the dyad was almost completely quenched, probably due to triplet excitation energy transfer from PtOEP to DPA.
TETRAHEDRON LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Guiying He, Kaia R. Parenti, Luis M. Campos, Matthew Y. Sfeir
Summary: Singlet fission refers to the process of generating two triplet excitons from a single absorbed photon. However, there are ambiguities in this definition due to the complexity of double triplet states and their interconversion processes. Traditional models depict singlet fission as a sequential two-step conversion, but they overlook the possibility of directly harvesting energy from coupled triplet pairs. This study demonstrates the direct extraction of individual triplet excitons from bound triplet pairs and quantifies the energy harvesting efficiency using unique spectral and kinetic features.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Multidisciplinary
Yifan Bo, Yuxuan Hou, Dominik Thiel, Renee Weiss, Timothy Clark, Michael J. Ferguson, Rik R. Tykwinski, Dirk M. Guldi
Summary: This study designs two tetracene dimers with different linking modes, and characterizes the interplay between intramolecular singlet fission (intra-SF) and intramolecular triplet-triplet annihilation up-conversion (intra-TTA-UC) through steady-state and time-resolved absorption and fluorescence spectroscopy. By using Pd-phthalocyanine as a sensitizer, intra-TTA-UC is achieved in the two dimers via indirect photoexcitation in the near-infrared part of the solar spectrum. Temperature-dependent measurements reveal the impact of thermal effects on intra-SF and intra-TTA-UC in different dimers.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Bikash Mandal, Barry D. Dunietz
Summary: This paper investigates the computational thermally activated delayed fluorescence (TADF) in donor-acceptor compounds and calculates the transition rates. The results show that the calculated rates agree well with the experimental measurements, while the semiclassical rates are underestimated. Furthermore, the study finds that the ortho and meta isomers are more effective as TADF emitters.
JOURNAL OF PHYSICAL CHEMISTRY A
(2022)
Article
Chemistry, Physical
Robby Buechner, Vinicius Vaz da Cruz, Nitika Grover, Asterios Charisiadis, Mattis Fondell, Robert Haverkamp, Mathias O. Senge, Alexander Foehlisch
Summary: Free base porphyrins, such as 5,10,15,20-tetrakis(4-carboxylatophenyl)porphyrin, are powerful photosensitizers for singlet oxygen generation and light-harvesting. The atomic level selectivity of dynamic UV pump - N K-edge probe X-ray absorption spectroscopy, combined with TD-DFT theory, provides insight into the excited molecular states within an unusual relaxation pathway. The efficient intersystem crossing is confirmed to be the result of long singlet excited state lifetime and thermal effects.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Spectroscopy
Wenbin Hu, Mingyue Fan, Xian-Fu Zhang, Mengmeng Li, Guoying Li
Summary: meso-RNH substituted BODIPY compounds with different substituents (R = C3H7, C4H9, PhCH2, H, and Ph) were synthesized to investigate their photophysical properties and photosensitizing abilities. UV-vis absorption, fluorescence spectroscopy, laser flash photolysis, and chemical trapping methods were employed to measure various parameters. The results show that the presence of meso-RNH leads to blue shift of absorption and emission wavelength, decrease in fluorescence quantum yield and lifetime, and increase in singlet oxygen formation. The mechanisms include photoinduced charge transfer, S0 and S1 geometry, and ground state structural isomerization. These findings are valuable for designing new functional materials.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2023)
Article
Chemistry, Multidisciplinary
Bo Pang, Chentong Liao, Xiaopeng Xu, Shaoqian Peng, Jianlong Xia, Yuanyuan Guo, Yuan Xie, Yuting Chen, Chunhui Duan, Hongbin Wu, Ruipeng Li, Qiang Peng
Summary: Suppressing photon energy loss, especially non-radiative loss, is crucial for improving the device performance of organic solar cells (OSCs). By introducing a BNIDT block into the PM6 polymer backbone, a series of triplet polymer donors were developed, leading to a reduced singlet-triplet energy gap and optimized morphology. This effectively suppresses non-radiative recombination and enhances charge transfer and transport, resulting in a champion power conversion efficiency (PCE) of 19.02%.
ADVANCED MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Federico J. Hernandez, Rachel Crespo-Otero
Summary: The study explores the light-induced processes of Cz using computational approaches, highlighting the impact of isomeric impurities on its ultralong phosphorescence properties. The mechanisms for exciton, Dexter energy transfer, and electron transport were analyzed, shedding light on the factors enhancing excited state lifetimes and the role of doping with organic molecules in organic materials.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Chemistry, Physical
Wentao Zhang, Wenguang Huang, Jiyuan Jin, Yonghai Gan, Shujuan Zhang
Summary: The importance of singlet oxygen (1O2) in various applications has driven research on photocatalytic generation of 1O2 using metal-organic frameworks (MOFs). Despite limitations in visible-light absorption and charge carrier recombination, beta-diketone anchoring on MIL-125 was found to enhance energy transfer and improve the photocatalytic generation of 1O2. This study sheds light on the potential of visible-light-responsive MOFs for 1O2 generation and suggests a new strategy for designing MOF-based photocatalysts.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2021)
Article
Chemistry, Multidisciplinary
Hui Min Tay, Emily J. Goddard, Carol Hua
Summary: Metalloporphyrins are promising colorimetric sensors for a wide range of small molecule analytes. Metal-organic frameworks containing metalloporphyrin units were used to detect amines and electron-rich species through colorimetric shifts.
Article
Chemistry, Physical
Seung-Je Woo, Jang-Joo Kim
Summary: The RISC rate of TADF molecules is influenced by the energy alignment of charge-transfer states, but the distribution of these states is affected by the conformational distribution of molecules. Investigating the energy distribution of the (CT)-C-3 state is challenging due to triplet instabilities. This study measured the energy distribution of CT states of TPSA in frozen toluene and used the M11* functional for TD-DFT calculations to verify the experimental results.
JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
Article
Chemistry, Organic
Martins S. Oderinde, Antonio Ramirez, T. G. Murali Dhar, Lyndon A. M. Cornelius, Christine Jorge, Darpandeep Aulakh, Bhupinder Sandhu, Joseph Pawluczyk, Amy A. Sarjeant, Nicholas A. Meanwell, Arvind Mathur, James Kempson
Summary: Indole and indoline rings are important pharmacophoric scaffolds found in various biologically active molecules. The [2 + 2] cycloaddition reaction has been successfully applied to construct diverse cyclobutane-fused structures with the use of indoles and alkenes. The reaction demonstrates good yield and high regio- and diastereoselectivity, providing potential for further derivatization.
JOURNAL OF ORGANIC CHEMISTRY
(2021)
Article
Biochemical Research Methods
K. Ramki, G. Thiruppathi, Selva Kumar Ramasamy, P. Sundararaj, P. Sakthivel
Summary: A chromone-based ratiometric fluorescent probe L2 was developed for the selective detection of Hg(II) in a semiaqueous solution. The probe exhibited enhanced fluorescence in its aggregated state and even higher fluorescence when chelated with Hg(II). The probe demonstrated high sensitivity and specificity for Hg(II) detection and was successfully applied for imaging Hg(II) in a living model.
Article
Biochemical Research Methods
Qun Zhang, Rui Yang, Gang Liu, Shiyan Jiang, Jiarui Wang, Juqiang Lin, Tingyin Wang, Jing Wang, Zufang Huang
Summary: This research aims to develop a cost-effective and portable method for measuring creatinine levels using the enhanced Tyndall effect phenomenon. The method offers a promising solution for monitoring renal healthcare in resource-limited settings.