Article
Multidisciplinary Sciences
Benjamin M. M. Mason, Mitsumasa Koyanagi, Tomohiro Sugihara, Makoto Iwasaki, Vladlen Slepak, David J. J. Miller, Yusuke Sakai, Akihisa Terakita
Summary: We identified six opsins from a coral species, including three novel opsins. We characterized the properties of four of these opsins and found that opsins 1 and 6 can activate Gs-type G protein in a light-dependent manner, with maximum sensitivities at 472 nm and 476 nm, respectively. Opsin 4 can induce intracellular Ca2+ increases through light-dependency. Our findings reveal that corals possess multiple opsins that regulate light-dependent signaling through different cascades.
SCIENTIFIC REPORTS
(2023)
Article
Biophysics
Peter Eberhardt, Chavdar Slavov, Janina Soermann, Christian Bamann, Markus Braun, Josef Wachtveitl
Summary: The study on the light-driven Na+ pump Krokinobacter rhodopsin 2 (KR2) revealed that with increasing temperature, the overall photocycle duration is accelerated, with the L-to-M transition exhibiting the most significant increase. This kinetic decoupling between the chromophore and the protein scaffold in KR2 could be utilized for fine-tuning biotechnological applications in the future.
BIOPHYSICAL JOURNAL
(2021)
Article
Chemistry, Physical
Chun-Fu Chang, Masae Konno, Keiichi Inoue, Tahei Tahara
Summary: Schizorhodopsin (SzR) is a newly discovered microbial rhodopsin subfamily that functions as an unusual inward-proton pump upon absorbing light. The unique chromophore-protein interactions resulting from two major protein structural differences around the chromophore may be responsible for its unusual function. Therefore, it is crucial to understand how these differences affect the primary photoreaction dynamics.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Review
Chemistry, Multidisciplinary
Keiichi Kojima, Yuki Sudo
Summary: Rhodopsins, photoreceptive membrane proteins, were first discovered as reddish pigments in frog retina in 1876. Later, a similar pigment called bacteriorhodopsin was found in the archaeon Halobacterium salinarum. Over time, more rhodopsin-like proteins have been identified in both animal eyes and microorganisms, with similarities in molecular properties but different functions. Based on these findings, it is proposed that animal and microbial rhodopsins independently evolved from distinct origins to fulfill different molecular and physiological functions in their respective organisms.
Article
Biochemistry & Molecular Biology
Mizuki Sumikawa, Rei Abe-Yoshizumi, Takayuki Uchihashi, Hideki Kandori
Summary: Proteorhodopsin undergoes an anomalous pH effect that leads to the transition from pentamer to monomer structure. The different pKa values of the Schiff base counterions result in different colors. Key residues and specific interactions play important roles in maintaining the pentamer structure and the pH-induced transition.
Article
Multidisciplinary Sciences
Stephan Hirschi, David Kalbermatter, Zoehre Ucurum, Thomas Lemmin, Dimitrios Fotiadis
Summary: The cryo-EM structure of pentameric green-light absorbing proteorhodopsin together with molecular dynamics simulations and functional studies provides insights into the proton translocation pathway and oligomerization, and a protonation-dependent mechanism for intracellular half channel hydration.
NATURE COMMUNICATIONS
(2021)
Article
Crystallography
Tomas Silha, Radovan Herchel, Ivan Nemec
Summary: A series of five novel Mn-salen-based compounds (1a-1c, 2a, 2b) were synthesized through the reaction between precursor chloride complexes and potassium silver/gold dicyanide. The compounds were structurally and magnetically characterized. The findings revealed that the Mn(III) central atoms exhibited axial magnetic anisotropy, and weak magnetic exchange was observed in compounds with a special supramolecular topology involving O-H···O hydrogen-bonded dimers.
Article
Biochemistry & Molecular Biology
Yosuke Mizuno, Kota Katayama, Hiroo Imai, Hideki Kandori
Summary: The proton transfer reaction is one of the key triggers for the functional expression of membrane proteins. An unexpected proton transfer reaction was discovered in cone opsins during the early photoreaction process, which involves dramatic changes in the protein environment.
Article
Chemistry, Multidisciplinary
Keisei Shibata, Kazumasa Oda, Tomohiro Nishizawa, Yuji Hazama, Ryohei Ono, Shunki Takaramoto, Reza Bagherzadeh, Hiromu Yaw, Osamu Nureki, Keiichi Inoue, Hudefumim Akiyama
Summary: Channelrhodopsins (ChRs) are light-gated ion channels that can control neuronal activity with high temporal resolution. The mechanism of how their channels open and close is still unknown. This study investigated the structural changes in the retinal chromophore of ChR C1C2 and the factors that limit the kinetics of the channel gating. The results showed that the retinal chromophore twists upon RSB deprotonation, causing the surrounding helices to move and open the channel, and the RSB reprotonation rate-limits the channel closing.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Physical
Partha Malakar, Ishita Das, Sudeshna Bhattacharya, Andrew Harris, Mordechai Sheves, Leonid S. Brown, Sanford Ruhman
Summary: Decades of research on microbial retinal proteins, ion pumps, and sensory photoreceptors have not yielded structure-function indicators for predicting photoisomerization dynamics. However, a new indicator has emerged in this study.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Baptiste Demoulin, Margherita Maiuri, Tetyana Berbasova, James H. Geiger, Babak Borhan, Marco Garavelli, Giulio Cerullo, Ivan Rivalta
Summary: The study shows that modifying the electrostatic environment of the chromophore through protein point mutations can affect its excited state properties, allowing control of its photophysics with the same power as chemical modifications of the chromophore. This fine control is essential for the design of bio-mimetic opto-electronic and photonic devices.
CHEMISTRY-A EUROPEAN JOURNAL
(2021)
Article
Chemistry, Multidisciplinary
Jin Feng, Baofeng Li, Xinlu Wang, Xinlong Mao, Tengfei Ma, Dapeng Zhang, Siwei Bi
Summary: We studied the relationship between visual function and structural characteristics, focusing on the C=O terminal group, N = 6 conjugation length, and CH3 saturated group. The presence of C=O in the conjugated chain is determined by N = 6, which prevents its occurrence in shorter carotenoids. N = 6 ensures the high stability of retinal and sensitivity to the growth of conjugation length. The electron-withdrawing ability of the saturated group determines its oxidation-reduction ability. Among them, the CH3-saturated retinal has electronic properties closest to H-saturated derivatives. We provide a new perspective on the specificity of retinal structure, contributing to the understanding of the visual mechanism and serving as a foundation for structural improvement and functional expansion of retinal.
NEW JOURNAL OF CHEMISTRY
(2023)
Article
Multidisciplinary Sciences
Orawan Jakdetchai, Peter Eberhardt, Marvin Asido, Jagdeep Kaur, Clara Nassrin Kriebel, Jiafei Mao, Alexander J. Leeder, Lynda J. Brown, Richard C. D. Brown, Johanna Becker-Baldus, Christian Bamann, Josef Wachtveitl, Clemens Glaubitz
Summary: This study on the functional mechanism of the light-driven sodium pump KR2 uses solid-state nuclear magnetic resonance spectroscopy to reveal the interconversion of photointermediates and the perturbation caused by the nearby bound sodium ion. The findings suggest a mechanism different from traditional principles, highlighting the importance of understanding the role of sodium ion in retinal conformation changes.
Article
Multidisciplinary Sciences
Jessica E. Besaw, Jorg Reichenwallner, Paolo De Guzman, Andrejs Tucs, Anling Kuo, Takefumi Morizumi, Koji Tsuda, Adnan Sljoka, R. J. Dwayne Miller, Oliver P. Ernst
Summary: In this study, the crystal structure of Thermoplasmatales archaeon SG8-52-1 heliorhodopsin (TaHeR) was determined under low pH conditions. The structure revealed the accommodation of a chloride anion in the hydrophilic Schiff base cavity (SBC), stabilizing the protonated retinal Schiff base. Computational studies further supported an intramolecular signaling transduction pathway, with allosteric network changes propagating from the perturbed SBC to the intracellular and extracellular space. These findings suggest the potential sensory role of TaHeR as a rhodopsin.
SCIENTIFIC REPORTS
(2022)
Article
Crystallography
Yousef Hijji, Rajeesha Rajan, Hamdi Ben Yahia, Said Mansour, Abdelkader Zarrouk, Ismail Warad
Summary: The water-soluble Glucose amine Schiff base (GASB-1) product was synthesized using mono-mode microwave heating, with a reaction time of 5 minutes and a 90% yield without any byproducts. The 3D structure of GASB-1 was determined through single crystal X-ray diffraction and computations, followed by various analyses of its properties.
Article
Biochemistry & Molecular Biology
Shunpei Hanai, Takashi Nagata, Kota Katayama, Shino Inukai, Mitsumasa Koyanagi, Keiichi Inoue, Akihisa Terakita, Hideki Kandori
Summary: Animal visual rhodopsins can be classified into monostable and bistable rhodopsins, typically found in vertebrates and invertebrates respectively. Bovine rhodopsin (BovRh) is an example of monostable rhodopsin with extensively studied structures and functions. On the other hand, the structures and functions of bistable rhodopsins, despite their importance in optogenetics, are less known. In this study, low-temperature Fourier transform infrared (FTIR) spectroscopy was used to compare the spectral changes of jumping spider rhodopsin-1 (SpiRh1), squid rhodopsin (SquRh), and BovRh. The analysis showed that while the chromophore distortion in the resting state is not distinctive between invertebrate and vertebrate rhodopsins, the distortion after photoisomerization is unique for BovRh. Moreover, the analysis of O-D stretching vibrations revealed unique features of protein-bound water molecules. The absence of strongly hydrogen-bonded water molecules is a distinct characteristic of animal rhodopsins compared to microbial rhodopsins.
Article
Biochemistry & Molecular Biology
Naoya Morimoto, Takashi Nagata, Keiichi Inoue
Summary: This study revealed that human and chicken RGRs form blue-absorbing pigments similar to bovine RGR, and they are bistable rhodopsins displaying a reversible photoreaction. These findings provide insight into the behavior of RGR as a retinal photoisomerase and aid in understanding its role in the visual system.
Article
Chemistry, Multidisciplinary
Maria del Carmen Marin, Masae Konno, Hiromu Yawo, Keiichi Inoue
Summary: Microbial rhodopsins are a large family of photoreceptive membrane proteins that have diverse light-regulated functions. New subfamilies of microbial rhodopsins that transport H+ inwardly, known as light-driven inward H+ pumps, have recently been discovered. This study conducted the first functional conversion study by mutating key amino acids in a natural outward H+-pumping rhodopsin, resulting in the creation of an artificial inward H+ pump. This finding provides insights into the key processes that differentiate between outward and inward H+ pumps, and could contribute to the understanding of ion transport mechanisms in other ion-pumping proteins.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Keisei Shibata, Kazumasa Oda, Tomohiro Nishizawa, Yuji Hazama, Ryohei Ono, Shunki Takaramoto, Reza Bagherzadeh, Hiromu Yaw, Osamu Nureki, Keiichi Inoue, Hudefumim Akiyama
Summary: Channelrhodopsins (ChRs) are light-gated ion channels that can control neuronal activity with high temporal resolution. The mechanism of how their channels open and close is still unknown. This study investigated the structural changes in the retinal chromophore of ChR C1C2 and the factors that limit the kinetics of the channel gating. The results showed that the retinal chromophore twists upon RSB deprotonation, causing the surrounding helices to move and open the channel, and the RSB reprotonation rate-limits the channel closing.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Koichi Shirokawa, Shoki Tanaka, Izuru Kawamura, Toshiki Sawada, Takeshi Serizawa
Summary: In this study, alkyl beta-celluloside assemblies loaded with fluorescent molecules were synthesized and characterized. The fluorescence intensities of these assemblies decreased upon enzymatic degradation of the cellulose moieties, indicating the release of fluorescent molecules into the aqueous phase. The rate of fluorescence decrease was dependent on the concentration and source of cellulase. Therefore, these assemblies can serve as substrates for cellulase detection assays by measuring changes in fluorescence intensities. Additionally, the assemblies can be used as carriers for the controlled release of loaded molecules triggered by enzymatic degradation.
Article
Chemistry, Multidisciplinary
Noriko Kanai, Scott A. Willis, Abhishek Gupta, Izuru Kawamura, William S. Price
Summary: MRI was used to investigate the instability mechanisms of oil-in-water Pickering emulsions stabilized by cellulose nanofibers over a month. The separation of oil layers and the distribution of oil droplets were captured in MR images. The relaxation times and diffusion coefficients of the emulsions were measured to analyze their properties.
Article
Chemistry, Physical
Asuka Kanno, Yosuke Ugata, Issei Ikeuchi, Mitsuhiro Hibino, Kensuke Nakura, Yuka Miyaoka, Izuru Kawamura, Daisuke Shibata, Toshiaki Ohta, Naoaki Yabuuchi
Summary: In this study, Li-excess manganese oxides with different fluorine contents were synthesized by high-energy mechanical milling. Li2MnO1.5F1.5 showed better capacity retention and higher energy density compared to Li2MnO2F. The electrode durability was greatly improved by using a highly concentrated electrolyte, achieving good capacity retention without voltage decay for >180 cycles.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Fengniu Lu, Akira Shinohara, Izuru Kawamura, Akinori Saeki, Tomohisa Takaya, Koichi Iwata, Takashi Nakanishi
Summary: This paper presents the room-temperature liquefaction of diphenylpyrene isomers by introducing bulky yet flexible branched alkyl chains through molecular desymmetrization. Six isomers with different symmetries were synthesized, and three of them were found to be liquids at 25°C and have remained in this state for more than five years. The unexpectedly non-crystallizing molecule with relatively high molecular symmetry was confirmed by rheological analysis of the amorphous material's kinetic inhomogeneity.
HELVETICA CHIMICA ACTA
(2023)
Article
Chemistry, Physical
Manish Singh, Shota Ito, Shoko Hososhima, Rei Abe-Yoshizumi, Satoshi P. Tsunoda, Keiichi Inoue, Hideki Kandori
Summary: AaClR is a natural light-driven chloride pump that binds chloride ions in the resting state. It is also able to pump sulfate ions, although with lower efficiency. The photocycle dynamics of the AaClR sulfate pump resemble a non-functional cycle, but there is evidence of transient binding of sulfate ions to AaClR. The molecular mechanism of this unusual active transport by AaClR is discussed.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Chemistry, Physical
Keiichi Inoue
Summary: Microbial rhodopsins are photoreceptive membrane proteins that exhibit diverse photobiological functions. The chromophore of these rhodopsins, all-trans-retinal, undergoes isomerization upon photoexcitation, leading to sequential conformational changes in the protein and the emergence of active states with biological functions. Recent studies have revealed new photochemical characteristics of retinal in some microbial rhodopsins, including red-shifted absorption, isomerization to different forms, and energy transfer from a secondary chromophore. These findings challenge the established understanding of retinal photochemistry in canonical microbial rhodopsins.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Chemistry, Physical
Chun-Fu Chang, Masae Konno, Keiichi Inoue, Tahei Tahara
Summary: Schizorhodopsin (SzR) is a newly discovered microbial rhodopsin subfamily that functions as an unusual inward-proton pump upon absorbing light. The unique chromophore-protein interactions resulting from two major protein structural differences around the chromophore may be responsible for its unusual function. Therefore, it is crucial to understand how these differences affect the primary photoreaction dynamics.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Editorial Material
Microbiology
Oded Beja, Keiichi Inoue
Summary: Marine diatoms are capable of switching their photosynthetic mode from chlorophyll-based to rhodopsin-based under iron-limitation conditions.
NATURE MICROBIOLOGY
(2023)
Article
Biophysics
Maria del Carmen Marin, Alexander L. Jaffe, Patrick T. West, Masae Konno, Jillian F. Banfield, Keiichi Inoue
Summary: Recent genomic and metagenomic analysis have identified many microbial rhodopsins with unique sequences. Functional characterization of these new microbial rhodopsins will enhance our understanding of their physiological roles.
BIOPHYSICS AND PHYSICOBIOLOGY
(2023)
Article
Biophysics
Sui Arikawa, Teppei Sugimoto, Takashi Okitsu, Akimori Wada, Kota Katayama, Hideki Kandori, Izuru Kawamura
Summary: This study investigates the TAT rhodopsin extracted from marine bacterium SAR11 HIMB114 using solid-state NMR spectroscopy. The results show that the RPSB of TAT forms a weak interaction with the counterion.
BIOPHYSICS AND PHYSICOBIOLOGY
(2023)
Article
Chemistry, Physical
Yusuke Nakasone, Yuma Kawasaki, Masae Konno, Keiichi Inoue, Masahide Terazima
Summary: Heliorhodopsins (HeRs) are a new category of rhodopsins, which exist as dimers and have an inverted topology. This study investigated the conformational changes of HeRs using the transient grating (TG) and circular dichroism (CD) methods. The results showed that there were no significant conformation changes on the protein's surface during the early steps of the reaction, but a decrease in diffusion coefficient (D) was observed after the formation of the O intermediate. The contribution of the ICL1 helix in the conformational changes was examined. The study suggests that the hydrophilic residues in the ICL1 helix undergo structural changes during the process. Rating: 8/10
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Sergey Yu. Ketkov, Sheng-Yuan Tzeng, Elena A. Rychagova, Anton N. Lukoyanov, Wen-Bih Tzeng
Summary: Metallocenes, including methylcobaltocene, play important roles in various fields of chemistry. The ionization energy and vibrational structure of (Cp ')(Cp)Co can be influenced by introducing methyl substituents. The mass-analyzed threshold ionization spectrum and DFT calculations provide accurate information about the properties and transformations of (Cp ')(Cp)Co.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Review
Chemistry, Physical
Qifeng Mu, Jian Hu
Summary: Polymer mechanochemistry has experienced a renaissance due to the rapid development of mechanophores and principles governing mechanochemical transduction or material strengthening. It has not only provided fundamental guidelines for converting mechanical energy into chemical output, but also found applications in engineering and smart devices.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Da Hye Yang, Francesco Ricci, Fredrik L. Nordstrom, Na Li
Summary: Through systematic evaluation of the oiling-out behavior of procaine, we identified both stable and metastable liquid-liquid phase separation, and established phase diagrams to assist in rational selection of crystallization strategies.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Vikki Anand Varma, Simmie Jaglan, Mohd Yasir Khan, Sujin B. Babu
Summary: Designing engineering structures like nanocages, shells, and containers through self-assembly of colloids is a challenging problem. This work proposes a simple model for the subunit, which leads to the formation of monodispersed spherical cages or containers. The model with only one control parameter can be used to design cages with the desired radius.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Hainan Jiang, Yaolong He, Xiaolin Li, Zhiyao Jin, Huijie Yu, Dawei Li
Summary: The cycling lifespan and coulombic efficiency of lithium-ion batteries are crucial for high C-rate applications. The Li-ion concentration plays a crucial role in determining the mechanical integrity and structural stability of electrodes. This study focuses on graphite as the working electrode and establishes an experimental system to investigate the mechanical properties of composite graphite electrode at different C-rates. Considering the effect of Li-ion concentration in stress analysis is found to be significant.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Zhiye Wang, Yunchuan Li, Mingjun Sun
Summary: This study investigates the influence of intramolecular pi-pi interactions on the electronic transport capabilities of molecules. By designing and analyzing three pi-conjugated molecules, the researchers observe that different pi-conjugated structures have varying effects on electron transport. The findings provide a theoretical foundation for designing single-molecule electronic devices with multiple electron channels based on intramolecular pi-pi interactions.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Yuandong Xu, Haoyang Feng, Chaoyang Dong, Yuqing Yang, Meng Zhou, Yajun Wei, Hui Guo, Yaqing Wei, Jishan Su, Yingying Ben, Xia Zhang
Summary: Hollow MoS2 cubes and spheres were successfully synthesized using a one-step hydrothermal method with the hard template method. The hollow MoS2 cubes exhibited higher specific capacitance and energy density compared to the hollow MoS2 spheres. The symmetrical supercapacitors assembled with these hollow structures showed good performance and high capacity retention after multiple cycles. These findings suggest that controlling the pore structure and surface characteristics of MoS2 is crucial for enhancing its electrochemical properties.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Ainhoa Oliden-Sanchez, Rebeca Sola-Llano, Joaquin Perez-Pariente, Luis Gomez-Hortiguela, Virginia Martinez-Martinez
Summary: The combination of photoactive molecules and inorganic structures is important for the development of advanced materials in optics. In this study, bulky dyes were successfully encapsulated in a zeolitic framework, resulting in emission throughout the visible spectrum.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Miaomiao Zhang, Cunyuan Pei, Qiqi Xiang, Lintao Liu, Zhongxu Dai, Huijuan Ma, Shibing Ni
Summary: The design of a solid electrolyte interphase (SEI) plays a crucial role in improving the electrochemical performance of anode materials. In this study, lithium difluoro(oxalate)borate (LiDFOB) is used as an electrolyte additive to form a protective SEI film on Li3VO4 (LVO) anodes. The addition of LiDFOB results in a dense, uniform, stable, and LiF-richer SEI, which enhances the Li-ion storage kinetics. The generated SEI also prevents further decomposition of the electrolyte and maintains the morphology of LVO anodes during charge/discharge processes. This work demonstrates the effectiveness of LiDFOB as a multi-functional additive for LiPF6 electrolytes and provides insights into SEI construction for high-performance LVO anodes.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
B. V. Andryushechkin, T. V. Pavlova, V. M. Shevlyuga
Summary: The atomic structure of the Ag(111)-p(4 x 4)-O phase was reexamined and two phases with the same periodicity were discovered. It was demonstrated that the accepted Ag6 model is incompatible with high-resolution oxygen-sensitive STM images.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
S. L. Romo-Avila, D. Marquez-Ruiz, R. A. Guirado-Lopez
Summary: In this study, we used density functional theory (DFT) calculations to investigate the interaction between model graphene oxide (GO) nanostructures and chlorine monoxide ClO. We aimed to understand the role of this highly oxidizing species in breaking C-C bonds and forming significant holes on GO sheets. Our results showed that C-C bonds in a single graphene oxide sheet can be broken through a simple mechanism involving the dissociation of two chemically attached ClO molecules. The formation of carbonyl groups and holes on the GO surface was also observed. This study provides important insights into the degradation of carbon nanotubes and the stability of GO during the myeloperoxidase (MPO) catalytic cycle.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Alberto Garcia-Fernandez, Birgit Kammlander, Stefania Riva, Hakan Rensmo, Ute B. Cappel
Summary: In this study, the X-ray stability of five different lead halide perovskite compositions (MAPbI3, MAPbCl3, MAPbBr3, FAPbBr3, CsPbBr3) was investigated using photoelectron spectroscopy. Different degradation mechanisms and resistance to X-ray were observed depending on the crystal composition. Overall, perovskite compositions based on the MA+ cation were found to be less stable than those based on FA+ or Cs+. Metallic lead formation was most easily observed in the chloride perovskite, followed by bromide, and very little in MAPbI3. Multiple degradation processes were identified for the bromide compositions, including ion migration, formation of volatile and solid products, as well as metallic lead. CsBr was formed as a solid degradation product on the surface of CsPbBr3.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Timofei Rostilov, Vadim Ziborov, Alexander Dolgoborodov, Mikhail Kuskov
Summary: The shock-loading behavior of nanomaterials is investigated in this study. It is found that shock compaction waves exhibit a distinct two-step structure, with the formation of faster precursor waves that travel ahead of the main compaction waves. The complexity of the shock Hugoniot curve of the tested nanomaterial is described, and the effect of initial porosity on the compressed states is demonstrated.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Sergey S. Nikitin, Alexander D. Koryakov, Elizaveta A. Antipinskaya, Alexey A. Markov, Mikhail V. Patrakeev
Summary: The stability of La1/3Sr2/3Fe1-xMnxO3-delta, a perovskite-type oxide, under reducing conditions is dependent on the manganese content. Increasing the manganese content leads to a decrease in stability. The behavior of iron and manganese in the oxide shows distinct differences, which can be attributed to the difference in the enthalpy of oxidation reactions. Additionally, the change in the La/Sr ratio affects the concentration of iron and manganese ions.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Mosayeb Naseri, Shirin Amirian, Mehrdad Faraji, Mohammad Abdur Rashid, Maicon Pierre Lourenco, Venkataraman Thangadurai, D. R. Salahub
Summary: Inspired by the successful transfer of freestanding ultrathin films of SrTiO3 and BiFeO3, this study assessed the structural stability and investigated the electronic, optical, and thermoelectric properties of a group of two-dimensional perovskite-type materials called perovskenes. The findings revealed that these materials are wide bandgap semiconductors with potential application in UV shielding. Moreover, they exhibit better electrical and thermal conductivity at high temperatures, enabling efficient power generation in thermoelectric devices.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
