Article
Chemistry, Multidisciplinary
Javier Ramos-Soriano, Alfonso Perez-Sanchez, Sergio Ramirez-Barroso, Beatriz M. Illescas, Khalid Azmani, Antonio Rodriguez-Fortea, Josep M. Poblet, Cormac Hally, Santi Nonell, David Garcia-Fresnadillo, Javier Rojo, Nazario Martin
Summary: In this study, an ultra-long-lived triplet state with a mean lifetime of 93 ms in an aqueous phase at room temperature was discovered. Different tridecafullerenes were synthesized and characterized, confirming aggregation in water. The study also revealed that the inner solvation of multifullerenes varies depending on their molecular design.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Review
Chemistry, Multidisciplinary
Masanori Uji, Till J. B. Zaehringer, Christoph Kerzig, Nobuhiro Yanai
Summary: Recently, significant progress has been made in visible-to-UV photon upconversion (TTA-UC) based on triplet-triplet annihilation (TTA) mechanism. The development of new chromophores has greatly improved the efficiency of converting low-intensity visible light into UV light. This review summarizes the recent advancements in visible-to-UV TTA-UC, including chromophore development, film production, and their applications in catalysis, bond activation, and polymerization. The challenges and opportunities in future material development and applications are also discussed.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Chengming Nie, Xuyang Lin, Guohui Zhao, Kaifeng Wu
Summary: In this study, low-toxicity ZnSe/ZnS core/shell quantum dots (QDs) were reported as potent visible photocatalysts to drive challenging organic transformations.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Chemistry, Multidisciplinary
Wiebke Alex, Patrick Lorenz, Christian Henkel, Timothy Clark, Andreas Hirsch, Dirk M. Guldi
Summary: This study provides a detailed understanding of the full reaction coordinate of NBDs to QCs and reveals that the photoreversibility of NBDs is influenced by the charge-transfer character.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Review
Chemistry, Inorganic & Nuclear
Waqas Ahmad, Jingjing Wang, Huanhuan Li, Qin Ouyang, Wanhua Wu, Quansheng Chen
Summary: This review article summarizes the latest advances in triplet-triplet annihilation upconversion (TTA-UC), covering aspects such as substrate patterns, excited-state engineering, and potential applications, aiming to extend the research scope of this technology.
COORDINATION CHEMISTRY REVIEWS
(2021)
Article
Chemistry, Applied
Jie Ma, Jinlong Li, Rui Yang, Weijian Xue, Qingxia Wang, Shenmiao Li
Summary: The study revealed that N-1 to N-5 exhibit significantly red-shifted UV-vis absorption and emission properties, with N-1 demonstrating dual emission, confirming their ESIPT characteristics. All compounds generated triplet excited states, with N-3 and N-4 showing longer triplet excited state lifetimes and higher photooxidative abilities than the other compounds.
Article
Engineering, Environmental
Bin Wu, William A. Arnold, Limin Ma
Summary: This study investigates the photolysis of atrazine under different illumination conditions and its reactivity with model photosensitizers, revealing the significant impact of model sensitizers on the loss of atrazine. This work provides insights into the use of model photosensitizers to mimic triplet (CDOM)-C-3* and its relevance in certain conditions.
Article
Chemistry, Physical
Afang Wang, Peng Zhou, Dongqi Tian, Heng Zhang, Zhaokun Xiong, Ye Du, Chuanshu He, Yue Yuan, Tingting Chen, Yang Liu, Bo Lai
Summary: This study reports the catalyst-free activation of peroxydisulfate (PDS) via visible light for the removal of fluoroquinolones (FQs). The mechanism of PDS activation by the excited triplet state of FQs ((3)FQs*) is proposed. Experimental results show that PDS can generate more ·OH in the presence of (3)FQs*. Both radical and non-radical oxidation reactions contribute to the degradation of FQs in the system. QTOF analysis and DFT calculations clarify the degradation pathways and reactive sites. The system exhibits excellent selective oxidation for FQs.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2022)
Review
Chemistry, Multidisciplinary
Narayan Sinha, Polina Yaltseva, Oliver S. Wenger
Summary: The nephelauxetic effect, which refers to the expansion of d-orbitals as a result of metal-ligand bond covalence, has been recognized for its importance in the design of new photoactive complexes using first-row transition metals. This effect can significantly impact the photophysical properties of 3d metal complexes in solution at room temperature. By exploiting the nephelauxetic effect, red luminescence in Cr-III and Mn-IV complexes has been shifted to the near-infrared spectral region, while charge-transfer excited states in Fe-II and Co-III complexes have been stabilized, improving their properties and application potential.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Yishu Jiang, Rafael Lopez-Arteaga, Emily A. Weiss
Summary: This study successfully extended the scope of quantum dot photocatalyzed cycloaddition reactions to substrates without anchoring groups by introducing polyaromatic energy shuttle molecules on the quantum dot surface, achieving high yields. Compared to traditional catalyst Ir(ppy)(3), it offers the advantages of lower catalyst loading, higher stability, and reusability.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Patrick A. Robertson, Hannah M. Bishop, Andrew J. Orr-Ewing
Summary: The study investigates the effects of dissolved metal salts on the excited-state dynamics of acetophenone in solution using ultrafast transient absorption spectroscopy. The findings show that coordination to metal ions alters the excited-state energies and dynamics of the photosensitizer, which could potentially modify the photochemistry of homogeneous photocatalytic systems.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Review
Chemistry, Multidisciplinary
Zihao Xu, Zhiyuan Huang, Tao Jin, Tianquan Lian, Ming L. Tang
Summary: The review focuses on the advancements made in the semiconductor-nanocrystal-sensitized, three-component upconversion system over the past 5 years. It discusses the critical roles of the triplet photosensitizer, mediator, and emitter in determining the overall quantum efficiency of the system, as well as the mechanisms involved in triplet energy transfer between the components. Through optimization of the sensitizer, mediator, and emitter, an increase in anti-Stokes shift and total quantum efficiency can be achieved.
ACCOUNTS OF CHEMICAL RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Naoyuki Harada, Yoichi Sasaki, Masanori Hosoyamada, Nobuo Kimizuka, Nobuhiro Yanai
Summary: The study reports a highly efficient visible-to-UV photon upconversion process, achieving a conversion efficiency of 20.5% by utilizing the excellent UV emitter TIPS-Nph and donor Ir(C6)(2)(acac).
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Chemistry, Multidisciplinary
David A. Cagan, Daniel Bim, Breno Silva, Nathanael P. Kazmierczak, Brendon J. McNicholas, Ryan G. Hadt
Summary: This study investigates the mechanism of Ni(II)-bpy aryl halide complexes and finds that structural control can regulate the potential energy surfaces of metal-to-ligand and ligand-to-metal charge transfer excited states, facilitating the process of excited-state bond homolysis. This provides a rational approach to utilize photonic energy in synthetic chemistry.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Physical
Saikat Mukherjee, Sergey A. Varganov
Summary: In excited states relaxation, internal conversion and intersystem crossing are crucial nonradiative transitions, whose interplay can lead to complex nonadiabatic dynamics. By utilizing the GAIMS method with TeraChem, nonadiabatic dynamics involving internal conversion and intersystem crossing transitions in moderate-sized molecules can be effectively modeled. The time constants describing the population transfer between different electronic states predicted by the GAIMS dynamics align well with characteristic times obtained from the analysis of the time-resolved photoelectron spectrum.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Khokan Roy, Surajit Kayal, Freek Ariese, Andrew Beeby, Siva Umapathy
JOURNAL OF CHEMICAL PHYSICS
(2017)
Article
Chemistry, Physical
Khokan Roy, Surajit Kayal, Venkatraman Ravi Kumar, Andrew Beeby, Freek Ariese, Siva Umapathy
JOURNAL OF PHYSICAL CHEMISTRY A
(2017)
Article
Chemistry, Physical
Surajit Kayal, Khokan Roy, Siva Umapathy
JOURNAL OF CHEMICAL PHYSICS
(2018)
Article
Chemistry, Physical
Syed M. Bilal, Surajit Kayal, Krishnankutty S. Sanju, Y. Adithya Lakshmanna
JOURNAL OF PHYSICAL CHEMISTRY A
(2018)
Article
Chemistry, Physical
Surajit Kayal, Khokan Roy, Yapamanu Adithya Lakshmanna, Siva Umapathy
JOURNAL OF PHYSICAL CHEMISTRY A
(2018)
Article
Chemistry, Physical
Ravi Kumar Venkatraman, Surajit Kayal, Arvind Barak, Andrew J. Orr-Ewing, Siva Umapathy
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2018)
Article
Chemistry, Physical
Surajit Kayal, Khokan Roy, Y. Adithya Lakshmanna, Siva Umapathy
JOURNAL OF CHEMICAL PHYSICS
(2018)
Article
Chemistry, Applied
Rowena A. Howie, Luke D. Elliott, Surajit Kayal, Xue-Zhong Sun, Magnus W. D. Hanson-Heine, Jonathan Hunter, Charlotte A. Clark, Ashley Love, Christopher Wiseall, Darren S. Lee, Martyn Poliakoff, Kevin I. Booker Milburn, Michael W. George
Summary: The integration of continuous photochemistry and flow reactions in high-temperature/high-pressure water has allowed for the consolidation of multistep reactions into a single process, reducing reaction time and increasing yields for potential use in multistage synthesis. This approach demonstrates the capability to create complex structures on a large scale through the combination of photochemistry and thermal chemistry in a continuous flow system. The use of high-temperature water/acetonitrile mixtures has also been shown to reduce reaction time and enhance productivity, with the possibility of scaling up for larger production facilities.
ORGANIC PROCESS RESEARCH & DEVELOPMENT
(2021)
Article
Chemistry, Physical
Reshma Mathew, Surajit Kayal, Adithya Lakshmanna Yapamanu
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2019)