Article
Chemistry, Multidisciplinary
Shahar Dery, Israel Alshanski, Evgeniy Mervinetsky, Daniel Feferman, Shlomo Yitzchaik, Mattan Hurevich, Elad Gross
Summary: The study investigated the impact of surface-adsorbate interactions on the adsorption geometry of stilbene-NHCs monolayers and its influence on surface potential. It was found that stilbene-NHCs on Au film accumulated in a vertical orientation for high photoisomerization efficiency, while strong metal-adsorbate interactions on Pt film led to a flat-lying adsorption geometry that quenched the photo-induced response.
CHEMICAL COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Ryo Koibuchi, Koichiro Omasa, Isao Yoshikawa, Hirohiko Houjou
Summary: A photoinduced crystal-to-liquid transition (PCLT) behavior of new acylhydrazone derivatives (NCs) has been reported. The high photoswitching performances of the NCs allowed the isolation and evaluation of both E- and Z-forms, observing distinct thermal behaviors. UV irradiation induced the E-to-Z conversion and eutectic melting of the crystals. In addition, photomechanical behavior of the crystals was observed.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Chamathka Dehiwala Liyanage, Jose J. Ortiz-Garcia, Annalena Struckmeier, Michael Kienzler, Rebecca C. Quardokus
Summary: Photochromic molecules can transform between two isomeric forms upon exposure to external stimuli, making them potential photoswitches for molecular electronic devices. Understanding the photoisomerization process on surfaces and its dependence on the local chemical environment is crucial for their efficient use in these applications.
Article
Chemistry, Organic
Julian Simke, Tom Boesking, Bart Jan Ravoo
Summary: The bidirectional photoswitching of arylazopyrazoles with visible light is achieved by incorporating pyrrolidine and piperidine in the ortho-position of the phenyl ring, leading to red-shifted absorption maxima and increased molar absorption coefficients. This allows for E -> Z isomerization with blue light (λ = 465 nm) and Z -> E isomerization with red light (λ = 600 nm). N-methylation of the pyrazole results in excellent thermal stability of the Z isomer.
Article
Chemistry, Multidisciplinary
Kieran Griffiths, Nathan R. Halcovitch, John M. Griffin
Summary: In this study, a highly efficient solid-state photoswitching material for solar thermal energy storage is reported. By incorporating 4-methoxyazobenzene (MOAB) into a metal-organic framework, near-quantitative photoisomerization and thermal energy release can be achieved.
Article
Physics, Multidisciplinary
Dong Hao, Xiangqian Tang, Wenyu Wang, Yang An, Yueyi Wang, Xinyan Shan, Xinghua Lu
Summary: The study investigates the rotational behavior of a single azobenzene molecule on the Au(111) surface excited by tunneling electrons and/or photons using first-principles density functional theory (DFT) calculation. The results show that the anchor phenyl ring prefers to adsorb on top of the fcc hollow site with an adsorption energy of about 1.76 eV, and the rotational energy profile reveals a potential barrier of approximately 50 meV during the rotation of one of the phenyl rings around the fcc hollow site. These findings are consistent with experimental observations and provide valuable insights for exploring a wide range of molecules on this noble metal surface.
Article
Chemistry, Physical
Huimin Wang, Yuqing Fu, Zhe-Ning Chen, Wei Zhuang, Minna Cao, Rong Cao
Summary: By modifying gold nanoparticles (Au NPs) with the macrocyclic molecule cucurbit[6]uril (Au@CB[6]), we report a hybrid nanomaterial based on Au. Au@CB[6] exhibits the optimal selectivity for CO, with the highest CO Faraday efficiency (FECO) reaching 99.50% at -0.6 V vs. reversible hydrogen electrode (RHE). The partial current density of CO formed by Au@CB[6] increases dramatically to 3.18 mA/cm(2) at -0.6 V, which is more than ten times greater than that of oleylamine-coated Au NPs (Au@OAm, 0.31 mA/cm(2)). Operando electrochemical measurement combined with density functional theory (DFT) calculations reveals that CB[6] can gather CO2 and increase the localized CO2 concentration near the metal interface, resulting in significantly enhanced electrochemical CO2 reduction reaction (CO2RR) performance.
Article
Chemistry, Multidisciplinary
Chaoyue Xiong, Guodong Xue, Lijun Mao, Lianghong Gu, Chao He, Yonghao Zheng, Dongsheng Wang
Summary: This study demonstrates a close relationship between the length of carbon spacer and the photoswitching property of DASAs, showing that shortening the carbon spacer improves the efficiency and rate of the light-induced linear-to-cyclic isomerization. Density functional theory calculation was used to investigate the molecular energy variation during the isomerization process. Thus, this work provides a reliable carbon spacer strategy to control the photoswitching behavior of DASAs using chemical methods.
Article
Chemistry, Multidisciplinary
Laura Zanetti-Polzi, Patrick Charchar, Irene Yarovsky, Stefano Corni
Summary: Through theoretical investigation, we have revealed the impact of peptide-ligand environment on the pH-responsive fluorescence of gold nanoclusters. Our findings show that subtle changes in the hexapeptide sequence can significantly alter the pH response of the clusters, providing insights into the underlying mechanism.
Article
Chemistry, Multidisciplinary
Arunachalam Raman, Afeefah U. Neelambra, Venugopal Karunakaran, Shanmugam Easwaramoorthi
Summary: In this study, two novel push-pull molecular compounds were reported, which showed controlled photochemical and photophysical excited state deactivation pathways by changing the solvent polarity. These compounds could be used as a new class of azobenzene-based luminescent photochromic molecules. The preferential excited state deactivation pathway could be controlled by altering the solvent polarity, which opens up new approaches in the construction of multinary molecular switches and development in diverse fields.
CHEMISTRY-AN ASIAN JOURNAL
(2023)
Article
Chemistry, Physical
Martin R. Lea, Vasilios G. Stavros, Reinhard J. Maurer
Summary: This study investigates the photoisomerisation of hemithioindigo and its functionalized derivatives using electronic structure theory. The results show that the inclusion of functional groups can significantly affect the isomerisation capabilities, thermal barrier, electronic absorption spectra, and mechanism of hemithioindigo.
Article
Chemistry, Multidisciplinary
Kieran Griffiths, Jake L. Greenfield, Nathan R. Halcovitch, Matthew J. Fuchter, John M. Griffin
Summary: Arylazopyrazole-loaded metal-organic frameworks were synthesized and their contraction and expansion properties were studied. The shape and pendant groups of the guest molecules influenced the framework contraction, and the framework expanded under light illumination. Confinement within the framework extended the thermal stability of the isomer.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Chemistry, Multidisciplinary
Yogesh Kumar, Vishwa Deepak Singh, Bhupendra Kumar Dwivedi, Nikhil Kumar Singh, Daya Shankar Pandey
Summary: The synthesis of Zn(ii) complexes based on azo-Schiff base ligands has been characterized and the structures of these complexes have been determined. The ligands exhibit reversible acid/base induced ON-OFF-ON switching and the complexes display fast photoisomerization rates, with C2 showing a faster rate compared to C1. Differences in photoisomerization rates may be related to energy gap between HOMO and LUMO levels for the respective isomers.
NEW JOURNAL OF CHEMISTRY
(2021)
Article
Chemistry, Physical
Adem Yavuz, M. Fatih Danisman
Summary: We studied the vibrational properties and the effect of beam kinetic energy on PFP thin films grown by SMBD technique. We found significant differences in the properties of films grown using helium and argon carrier gasses for low coverage films and low deposition rates. However, for multilayer films, there were no significant differences between films grown with helium and argon. The vibrational properties were investigated using s-SNOM, and it was found that PFP-substrate interactions resulted in significant differences in the spectra of thin films but not thick films. Davydov splitting of the IR modes was observed for both thin and thick films, indicating similar molecular arrangements.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Junhong Pang, Ziqi Deng, Shanshan Sun, Guanheng Huang, Guohui Zhang, Amjad Islam, Li Dang, David Lee Phillips, Ming-De Li
Summary: The excited state's relaxation of DPE, SP, and TS in nanocrystal/microcrystal suspensions is significantly accelerated compared to in solution, with SP showing the fastest decay rate and potentially being the best candidate for photoswitching devices. The acceleration of the excited state's evolution in nanocrystal/microcrystal suspensions is attributed to intermolecular interactions and space restriction of the crystal, providing new insights for the design of optical materials.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Inorganic & Nuclear
Gernot Heitmann, Christian Schuett, Jens Groebner, Lukas Huber, Rainer Herges
DALTON TRANSACTIONS
(2016)
Article
Chemistry, Organic
Gernot Heitmann, Christian Schuett, Rainer Herges
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
(2016)
Article
Materials Science, Multidisciplinary
Tim Wuerger, Christian Feiler, Felix Musil, Gregor B. Feldbauer, Daniel Hoeche, Sviatlana Lamaka, Mikhail L. Zheludkevich, Robert H. Meissner
FRONTIERS IN MATERIALS
(2019)
Article
Materials Science, Multidisciplinary
Di Mei, Sviatlana V. Lamaka, Christian Feiler, Mikhail L. Zheludkevich
Article
Materials Science, Multidisciplinary
Christian Feiler, Di Mei, Bahram Vaghefinazari, Tim Wuerger, Robert H. Meissner, Berengere J. C. Luthringer-Feyerabend, David A. Winkler, Mikhail L. Zheludkevich, Sviatlana V. Lamaka
Article
Materials Science, Multidisciplinary
C. Feiler, D. Mei, B. J. C. Luthringer-Feyerabend, S. Lamaka, M. L. Zheludkevich
Summary: This study demonstrates a proof of concept for controlling the degradation of Mg-based materials by tuning the electronic properties of bipyridine. Experimental validation was conducted to verify the trends predicted by quantum chemical calculations.
Article
Multidisciplinary Sciences
Tim Wuerger, Christian Feiler, Gregor B. Vonbun-Feldbauer, Mikhail L. Zheludkevich, Robert H. Meissner
SCIENTIFIC REPORTS
(2020)
Article
Polymer Science
Audrius Doblies, Christian Feiler, Tim Wuerger, Eduard Schill, Robert H. Meissner, Bodo Fiedler
Summary: Detecting weak spots in composite structures remains a challenge in the aviation industry, with the assessment of load-bearing capability and structural integrity after damage being crucial. A reliable nondestructive inspection method to estimate residual mechanical properties is still lacking, and existing techniques face limitations due to a lack of generalization. Proposed techniques have specific applications but do not cover all major damage scenarios.
Article
Chemistry, Physical
Elisabeth J. Schiessler, Tim Wuerger, Sviatlana Lamaka, Robert H. Meissner, Christian J. Cyron, Mikhail L. Zheludkevich, Christian Feiler, Roland C. Aydin
Summary: The article proposes two systematic approaches for identifying molecular descriptors most relevant for the corrosion inhibition efficiency of chemical compounds using sparse feature selection, one based on analysis of variance and the other on random forests. Both combined with deep neural networks can predict the corrosion inhibition efficiencies, outperforming predictions relying on random selection of molecular descriptors. Autoencoders could be used in the future to enable even more accurate automated predictions of corrosion inhibition efficiencies.
NPJ COMPUTATIONAL MATERIALS
(2021)
Article
Chemistry, Physical
Min Deng, Linqian Wang, Bahram Vaghefinazari, Wen Xu, Christian Feiler, Sviatlana V. Lamaka, Daniel Hoeche, Mikhail L. Zheludkevich, Darya Snihirova
Summary: Aqueous Mg batteries are a promising energy storage system to meet the increasing demand for green, renewable, and sustainable energy. This review discusses recent progress in aqueous Mg battery systems, including anode and electrolyte development, and also explores potential future directions for battery advancement and the application of computational methods.
ENERGY STORAGE MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Amir Kotobi, Lucas Schwob, Gregor B. Vonbun-Feldbauer, Mariana Rossi, Piero Gasparotto, Christian Feiler, Giel Berden, Jos Oomens, Bart Oostenrijk, Debora Scuderi, Sadia Bari, Robert H. Meissner
Summary: The authors accurately interpret and reproduce the experimental infrared spectra of a model peptide in the gas phase using a combination of replica-exchange molecular dynamics simulations, machine learning, and ab initio calculations. They evaluate the possibility of averaging representative structural contributions to obtain an accurate computed spectrum by partitioning the conformational phase space into subensembles of similar conformers and calculating the IR contribution of each representative conformer. Improvements achieved by decomposing clusters containing similar conformations into smaller subensembles provide strong evidence for the importance of assessing the conformational landscape and hydrogen bonding in deciphering important fingerprints in experimental spectroscopic data.
COMMUNICATIONS CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Xuejiao Li, Bahram Vaghefinazari, Tim Wuerger, Sviatlana V. Lamaka, Mikhail L. Zheludkevich, Christian Feiler
Summary: This study utilizes statistical methods and machine learning techniques to predict the performance of untested compounds by analyzing the corrosion responses of small organic molecules on the magnesium alloy AZ91 and utilizing molecular descriptors derived from their geometry and density functional theory calculations. These methods provide a way to select effective corrosion inhibitors.
NPJ MATERIALS DEGRADATION
(2023)
Article
Chemistry, Physical
Tim Wuerger, Linqian Wang, Darya Snihirova, Min Deng, Sviatlana Lamaka, David A. Winkler, Daniel Hoche, Mikhail L. Zheludkevich, Robert H. Meissner, Christian Feiler
Summary: This study evaluates the robustness and predictive performance of two QSPR models and proposes a multi-objective optimization method to accelerate the discovery of advanced battery systems.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Materials Science, Multidisciplinary
Tim Wurger, Di Mei, Bahram Vaghefinazari, David A. Winkler, Sviatlana V. Lamaka, Mikhail L. Zheludkevich, Robert H. Meissner, Christian Feiler
Summary: By utilizing machine learning and data-driven methods, it is possible to accelerate the discovery of organic molecules that modulate the degradation behavior of magnesium, thereby modifying the service environment of light metal materials. Through unsupervised clustering and predictive modeling, a large number of potential Mg dissolution modulators can be analyzed and predicted, confirming the reliability of the model.
NPJ MATERIALS DEGRADATION
(2021)
Article
Chemistry, Multidisciplinary
Hanno Sell, Anika Gehl, Daniel Plaul, Frank D. Soennichsen, Christian Schuett, Felix Koehler, Kim Steinborn, Rainer Herges
COMMUNICATIONS CHEMISTRY
(2019)