Article
Biochemistry & Molecular Biology
Adam M. Cowden, Raul Losantos, Abigail L. Whittock, Beatriz Penin, Diego Sampedro, Vasilios G. Stavros
Summary: Sunscreens protect our DNA from UV radiation by absorbing or reflecting the rays before they reach the skin. However, concerns regarding the toxicity of current UV filters have led to a focus on natural, microbial-inspired filters. This paper provides new insight into the mechanisms of photoprotection in synthetic analogs of mycosporine-like amino acid-type UV filters, offering potential for the development of more efficient biomimetic DNA photoprotectant materials.
PHOTOCHEMISTRY AND PHOTOBIOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Yujun Li, Jie Yang, Xinxin Geng, Pan Tao, Yanling Shen, Zhishan Su, Ke Zheng
Summary: This article presents a single-step radical approach for the modular synthesis of functionally diverse alpha-tertiary amino acids (ATAAs). The synthesis takes place under mild conditions without the use of metals, photocatalysts, or other additives. The method demonstrates broad functional group tolerance and late-stage applicability, as well as gram-scale synthesis via flow chemistry. Mechanistic studies reveal the key intermediate in the reaction.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2022)
Article
Biochemistry & Molecular Biology
Abigail L. Whittock, Jack M. Woolley, Nazia Auckloo, Christophe Corre, Vasilios G. Stavros
Summary: This study investigates the relaxation pathway and long-term photostability of mycosporine-like amino acids. The results reveal that the excited state lifetimes of these molecules are short and energy is transferred to the solvent through a conical intersection. High levels of photostability are observed under continuous irradiation.
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
Narayan Sinha, Juan-Ramon Jimenez, Bjorn Pfund, Alessandro Prescimone, Claude Piguet, Oliver S. Wenger
Summary: By combining pi-donating amido with pi-accepting pyridine coordination units in a tridentate chelate ligand, a strong nephelauxetic effect was achieved in a homoleptic Cr-III complex, shifting its luminescence to the NIR-II spectral range. This study focuses on increasing metal-ligand bond covalence to shift the ruby-like E-2 emission of Cr-III to 1067 nm at 77 K, taking a fundamentally different approach from previous ligand design strategies.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Engineering, Electrical & Electronic
A. C. Anithaa, S. B. Mayil Vealan, C. Sekar
Summary: UV-ray irradiated WO3 nanoparticles have been used to develop an electrochemical sensor for the simultaneous determination of L-Tyrosine and L-Tryptophan with high sensitivity and selectivity, making it suitable for precise determination in food products like milk.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Chemistry, Multidisciplinary
Busra Can, Yusuf Cakmak
Summary: This study reports the synthesis and photophysical investigations of two different near IR absorbing classes of Boron dipyrromethene (Bodipy) photosensitizers for use in Photodynamic therapy (PDT) and fluorescent bioimaging purposes. The benzofused Bodipy derivative was found to be an effective PDT agent, while the unique distyryl derivative showed better singlet oxygen generation ability.
Article
Environmental Sciences
Huimin Chen, Bingliang Zhuang, Jane Liu, Yinan Zhou, Yaxin Hu, Yang Chen, Yiman Gao, Wen Wei, Huijuan Lin, Shu Li, Tijian Wang, Min Xie, Mengmeng Li
Summary: Absorbing aerosols significantly influence tropospheric photochemistry and regional climate change. A quantification of the direct radiative effects of absorbing aerosols at major AERONET sites in East Asia and their impacts on near-surface photochemical processes was conducted using a radiation transfer model. The annual average aerosol optical depth (AOD) of sites in China, Korea, and Japan was 1.15, 1.02, and 0.94, respectively, with absorbing aerosol optical depth (AAOD) proportions of 8.61%, 6.69%, and 6.49%, respectively. The influence of absorbing aerosol on ultraviolet (UV) radiation was mainly observed in the UV-A band (315-400 nm). The reduction in annual mean near-surface J[NO2] (J[(OD)-D-1]) due to absorbing aerosols was 16.95% (22.42%), 9.61% (13.55%), and 9.63% (13.79%) for China, Korea, and Japan, respectively. In the Beijing-Tianjin-Hebei (BTH) and Yangtze River Delta (YRD) regions, the annual average AOD was 1.48 and 1.29, and the AAOD was 0.14 and 0.13, respectively. The solar radiative forcing caused by black carbon (BC)-dominated aerosols on the surface was -3.19 and -2.98 W m(-2) for BTH and YRD, accounting for around 40% of the total aerosol radiative forcing. The reduction efficiency of BC-dominated aerosols on solar radiation was higher than that of other types of aerosols. The annual mean J[NO2] (J[(OD)-D-1]) decreased by 14.90% (20.53%) and 13.71% (18.20%) due to BC-dominated aerosols. The daily maximum photolysis rate usually occurred near noon due to the diurnal variation of solar zenith angle, resulting in a daily average photolysis rate decrease of 2-3% during 10:00-14:00.
Review
Chemistry, Applied
Hao-Qiang Cao, Jun-Kuan Li, Fa-Guang Zhang, Dominique Cahard, Jun-An Ma
Summary: This review comprehensively summarizes modern synthetic methods towards asymmetric construction of chiral amino carboxylic-phosphonic acid derivatives, including phosphono-containing amino acid derivatives and catalytic enantioselective synthesis as a potent strategy. Topics such as chiral resolution protocols, chiral auxiliary-directed syntheses, and valorization of abundant chiral amino acid resources are also discussed.
ADVANCED SYNTHESIS & CATALYSIS
(2021)
Review
Chemistry, Multidisciplinary
Francisco Jose Aguilar Troyano, Kay Merkens, Khadijah Anwar, Dr Adrian Gomez-Suarez
Summary: Amino acids are key structural motifs widely used in organic synthesis, biochemistry, and material sciences. Radical chemistry strategies for the synthesis and modification of amino acids have gained increased attention in recent years, providing rapid access to libraries of novel unnatural amino acids containing a wide range of structural motifs.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Review
Optics
Jingjing Li, He Cao, Zhibin Zhang, Shuo Liu, Yuanqin Xia
Summary: This article reviews recent research on novel acene materials and their developments in the field of solar cells, aiming to provide researchers with ideas for applying the singlet fission process to solar cells.
Article
Chemistry, Organic
Mingming Mao, Jia Li, Kang Dong, Rui-Peng Li, Xi Chen, Jian Liu, Shouchu Tang
Summary: We present a metal-free late-stage reductive C2 alkylation method for the synthesis of structurally complex peptides, utilizing readily available 1,3-dithianes. This protocol shows a broad substrate scope and excellent tolerance toward reactive functional groups.
Article
Chemistry, Physical
Matthias Broser, Tadeusz Andruniow, Anastasia Kraskov, Riccardo Palombo, Sagie Katz, Miroslav Kloz, Jakub Dostal, Cesar Bernardo, John T. M. Kennis, Peter Hegeman, Massimo Olivucci, Peter Hildebrandt
Summary: The recently discovered Neorhodopsin (NeoR) exhibits unique optical properties in the near-infrared spectral region, making it attractive for optogenetic applications. This study evaluates the electronic structure of NeoR by resonance Raman spectroscopy and confirms the consistency between the experimental and calculated spectra.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Uvinduni I. Premadasa, Vera Bocharova, Audrey R. Miles, Diana Stamberga, Stella Belony, Vyacheslav S. Bryantsev, Adnan Elgattar, Yi Liao, Joshua T. Damron, Michelle K. Kidder, Benjamin Doughty, Radu Custelcean, Ying-Zhong Ma
Summary: One of the challenges in current DAC technologies is the high energy cost for sorbent regeneration and CO2 release, making large-scale deployment economically unfeasible. In this study, a photochemically-driven approach using a unique photoacid was developed for CO2 release in DAC systems. The results showed that under light irradiation, a significant conversion of total inorganic carbon to CO2 was achieved, confirming the feasibility of energy-efficient CO2 release using light instead of heat.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Polymer Science
Xianglong He, Yayu Shao, Yulian Pang, Jing Wang, Mingke Liu, Yangyang Xin, Yingquan Zou
Summary: This study investigates the photoinitiating capacity of four cyanines with iodonium salt systems under different light sources. The S2265/Iod system exhibits remarkable stability in all light sources, while the S2024, S2025, and S2025B/Iod systems are effective under specific light sources. The photoinitiating mechanisms of the cyanine/Iod systems are explored using fluorescence, photolysis, and thermal imaging methods.