Article
Multidisciplinary Sciences
Alexander Y. Hwang, Rohit Chikkaraddy, David -Benjamin Grys, Oren A. Scherman, Jeremy J. Baumberg, Bart de Nijs
Summary: Nanoconfined few-molecule water clusters are important systems for studying hydrogen bonding, but most experiments are limited to cryogenic temperatures. This study shows that combining Raman spectroscopy with the molecular nanocapsule cucurbituril allows for the sequestration and analysis of water clusters at ambient conditions. The technique provides high-resolution vibrational spectra and can track specific isotopic exchanges inside the water clusters.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Chemistry, Physical
Wikorn Punyain, Kaito Takahashi
Summary: In this study, we evaluated the impact of argon tagging on the binding energy and vibrational spectra of water halide anion complexes. We found that argon tagging affects the peak position of the IHB OH stretching mode and different halides show different binding preferences. Additionally, the competition between the energy lowering of the anharmonic IHB OH (OD) stretching mode and the intermolecular out-of-plane IHB OH (OD) wagging mode is crucial in determining the preference between H- and D-binding.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Physical
Richard Beckmann, Rafal Topolnicki, Dominik Marx
Summary: This article investigates the effects of interactions between different numbers of helium atoms and protonated acetylene on its structure and dynamics. The results show that microsolvation by helium significantly affects the structure of C2H3+, and solvation becomes increasingly isotropic after adding six or more helium atoms. This study provides a basis for further exploration of the effects of tagging on the structure of flexible molecules.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Chemistry, Inorganic & Nuclear
Maxime Laurans, Michele Mattera, Raphael Salles, Ludivine K'Bidi, Pierre Gouzerh, Severine Renaudineau, Florence Volatron, Geoffroy Guillemot, Sebastien Blanchard, Guillaume Izzet, Albert Sole-Daura, Josep M. Poblet, Anna Proust
Summary: The mixed molybdenum/tungsten polyoxometalate hybrid has been successfully synthesized and characterized. Electrochemical analysis reveals its easier reducibility compared to the all-tungsten counterpart, accompanied by an unusual red shift in the electronic absorption spectrum during the second reduction. Various techniques, including spectroelectrochemistry, electron spin resonance, and theoretical calculations, have been employed to investigate the nature of the second reduction, confirming its Mo-centered nature with two antiferromagnetically coupled extra electrons.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Justin T. Henthorn, George E. Cutsail, Thomas Weyhermueller, Serena DeBeer
Summary: This article investigates the electronic structure and spin states of mixed-valent iron-sulfur dimers and discovers a new interaction that can stabilize high spin states. By studying a series of mixed-valent complexes, complex interactions between antiferromagnetic coupling, Heisenberg double-exchange, and vibronic coupling are revealed.
Article
Chemistry, Physical
Martin Buessler, Shingo Maruyama, Moritz Zelenka, Hiroshi Onishi, Ellen H. G. Backus
Summary: This study investigates the interface structure between the photocatalyst strontium titanate and water. The results show that the orientation and hydrogen bonding environment of water molecules at the interface are dependent on pH conditions.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Chemistry, Physical
Reman Kumar Singh, G. Naresh Patwari
Summary: The ability of an acid to dissociate depends on the solvent and the arrangement of solvent molecules around the protic group. Confining the acid-solvent system to nanocavities can enhance the dissociation process. By confining HCl/HBr complexed with ammonia or a water dimer within the C60/C70 cage, acid dissociation is promoted. This confinement strengthens the electric field along the H-X bond, reducing the minimum number of solvent molecules required in the gas phase.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Chemistry, Physical
Conor J. Bready, Sara Vanovac, Tuguldur T. Odbadrakh, George C. Shields
Summary: This computational study investigates the formation of prenucleation clusters in the sulfuric acid, glycine, serine, ammonia, and water system. The results demonstrate that the stability of complexes is determined by the molecular interactions rather than the base strength. The detailed structure plays a crucial role in the formation of larger complexes.
JOURNAL OF PHYSICAL CHEMISTRY A
(2022)
Article
Chemistry, Multidisciplinary
Arseniy A. Otlyotov, Yury Minenkov
Summary: The experimental gas-phase thermochemistry of alkali metal reactions with acetonitrile/ammonia is reproduced. Three approximations are tested and the modified scaled RRHO scheme (msRRHO) provides the most accurate reaction entropies. The msRRHO approach is also used to calculate the enthalpy contribution and reaction Gibbs free energies, ensuring internal consistency. The final increment Gibbs free energy MUEs for msRRHO, sRRHO(100) and sRRHO schemes are 1.2, 3.6 and 3.1 kcal mol(-1).
JOURNAL OF COMPUTATIONAL CHEMISTRY
(2023)
Article
Chemistry, Physical
Paulina Maczugowska, Paulina Zawadzka, Krzysztof Halagan, Marcin Pastorczak, Joanna Sadlej, Marcin Kozanecki
Summary: In this study, water clusters formed in organic liquid matrices with different polarities were investigated using infrared absorption spectroscopy, Molecular Dynamics simulations, and Density Functional Theory calculations. The correlation between experiments and computations at a high level of accuracy was presented for the first time. The results revealed that a higher polarity of the organic matrix favored the formation of stable, small, and cyclic water clusters, while water molecules in nonpolar matrices tended to undergo phase separation on a macroscopic scale. The size of the water clusters strongly depended on the water content in the matrix.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Chemistry, Physical
Chong Wang, Liangfei Fu, Shuo Yang, Huijun Zheng, Tiantong Wang, Jiao Gao, Mingzhi Su, Jiayue Yang, Guorong Wu, Weiqing Zhang, Zhaojun Zhang, Gang Li, Dong H. Zhang, Ling Jiang, Xueming Yang
Summary: The microscopic events and behaviors of SO2-H2O interactions were experimentally characterized using infrared spectroscopy and threshold photoionization. The study revealed the size-dependent development of SO2 hydrate structure and cluster growth in water clusters, providing insights into the chemistry of SO2 in cloud droplets.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Spectroscopy
Bin Li, Xiao Zhang, Rong Wang, Yu Mei, Jianjun Ma
Summary: A theoretical model combining integral equation and radiative transfer theory was used to fit the measured data on scattering behavior of THz waves interacting with plant leaves. The model demonstrated good agreement for water status evaluation with consideration of variation in leaf thickness and surface roughness. The study investigated the applicability of THz waves for water status monitoring under different conditions such as temperature, salinity, and polarization in reflection and transmission geometries.
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
(2021)
Article
Chemistry, Physical
Zehua Chen, Yang Yang
Summary: This study develops a new approach (CNEO-MD) to accurately and efficiently incorporate nuclear quantum effects into classical molecular dynamics (MD) simulations by combining constrained nuclear-electronic orbital (CNEO) theory with classical MD. It provides a theoretical foundation for CNEO-MD by developing an alternative formulation of the equations of motion for MD. The results show that this new MD approach is significantly more accurate than the conventional way of performing classical MD and generally outperforms centroid MD and ring-polymer MD in describing vibrations in model systems.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Shivani Srivastava, Blas Pedro Uberuaga, Mark Asta
Summary: Density functional theory is used to investigate the effects of different local arrangements of Fe2+ and Fe3+ cations on oxygen vacancies in magnetite. The results show that the preferred defect configurations depend on the presence of nearest-neighbor Fe3+ cations. The lowest-energy defect formation energies vary by about 0.2 eV with the local environment and can further differ by approximately 1.1 eV depending on the spin configuration. The findings also have implications for oxygen transport.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Koutarou Kanno, Genki Sase, Cathy E. McNamee
Summary: The study aimed to prepare metal oxide materials with optimal surface charge by mixing non-modified metal oxide nanoparticles with different isoelectric points, allowing for their use in environments where the solution pH cannot be changed. Mixing different types of nanoparticles in a Langmuir film at an air-aqueous interface can help change the physical properties of the transferred film.