Article
Chemistry, Multidisciplinary
Hyojoo Kim, Bhupendra Kumar Singh, Wooyong Um
Summary: This study provides new insight into tritium separation by investigating hydrogen isotope-selective exchange reaction on hydrogen-bonded fluorine sites. Fluorinated mesoporous silica, F-MCM-41_NCs, was prepared as a novel tritium sorbent that showed significantly enhanced tritium isotope separation factor compared to pristine MCM-41. The optimal separation factor of 3.3 was achieved using 0.5F-MCM-41_NC prepared with 0.5 g of NH4F per gram of MCM-41. This optimal factor is attributed to the compromise between (NH4)2SiF6 and the stability of MCM-41 framework.
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
(2023)
Article
Chemistry, Physical
M. S. Fedorov, N. Giricheva, S. A. Syrbu, E. A. Belova, I. A. Filippov, M. R. Kiselev
Summary: The quantum-chemical modeling results demonstrate the self-assembly process in the system based on 4-alkylbenzenesulfonic acids and 4-pyridyl 4'-alkyloxybenzoates, showing the formation of strong hydrogen-bond complexes. Experimental evidence also supports the formation of an O·H-N type hydrogen-bonded H-complex between the compounds under study. Additionally, the study reveals that the H-complex formed by 4-methylbenzenesulfonic acid and 4-pyridyl 4'-heptyloxybenzoate exhibits a wider temperature range smectic mesophase compared to 4-pyridyl 4'-heptyloxybenzoate alone.
JOURNAL OF MOLECULAR STRUCTURE
(2021)
Article
Chemistry, Multidisciplinary
Xiaojun Ding, Yilin Luo, Wei Wang, Tongyang Hu, Jing Chen, Gang Ye
Summary: This study presents a new approach of using inorganic ammonium cations as hydrogen bond donors to regulate the assembly of carboxylic tectons and build robust hydrogen-bonded frameworks. The resulting frameworks exhibit permanent ultra-micropores and open oxygen sites, with diverse pore architectures achieved by bridging different building blocks with tetrahedral NH4+. The activated porous PTBA·NH4·DMF demonstrates remarkable selective sorption of CO2 over N2 and H2.
Article
Materials Science, Multidisciplinary
Ivan Nemec, Irena Matulkova, Wolfgang Krumbe, Lionel Andersen, Ivana Cisarova, Jan Kroupa, Petr Nemec, Ladislav Bohaty, Petra Becker
Summary: The study provides a fundamental characterization of optical properties for non-centrosymmetric guanidinium compounds GuH(2)PO(3) and GuHSeO(3) with polar symmetry P2(1), including X-ray crystal structure analysis and vibrational spectroscopy study. Both compounds exhibit pronounced pyroelectricity but no indication for ferroelectric behavior. The crystals allow phase matching for second harmonic generation (SHG) of type I and type II processes.
Article
Chemistry, Physical
Yuji Yamada, Tomoya Kawao, Saeka Urayoshi, Kyojun Nakayama, Yoshinori Nibu
Summary: The structures of hydrogen-bonded benzoxazole clusters with methanol and ammonia were studied by measuring electronic and vibrational spectra. The stability of the isomers strongly depends on the solvent molecules. The interaction between the CH group and the nitrogen atom of ammonia enhances the stability of the C2HN isomer.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Chemistry, Physical
Cory C. Pye, Peyman Akbari, Barbara L. Goodall, Marwa Y. Shah Alam
Summary: In this study, the geometries, energies, and vibrational frequencies of various isomers of HSeO4-(H2O)(n), n = 0-6, were calculated at different cluster sizes. The properties were analyzed as the cluster size increased. Experimental and theoretical vibrational spectra were compared, revealing the full-widths at half-height and the strong temperature and solvent dependence of the Se-O(H) stretching and SeOH bending vibration.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Chemistry, Multidisciplinary
Bhagwat Kharat, Mahadevappa Naganathappa, S. Ramesh, Ajay Chaudhari
Summary: Hydrogen bonding interactions in linear and cyclic clusters of nitroxyl were studied using density functional theory. Many-body analysis technique was used to investigate the nature and strength of interactions in different cluster sizes. The vibrational frequencies and electronic absorption spectra showed significant changes from monomer to tetramer configurations.
STRUCTURAL CHEMISTRY
(2021)
Article
Chemistry, Physical
P. Ramanna, Jayashree Tonannavar, J. Tonannavar
Summary: 5-Bromoisophthalic acid is a potential organic linker in Hydrogen-bonded Organic Frameworks (HOFs), with its H-bonding properties playing a crucial role in optimizing structural transformations, dissolution, re-crystallization, density, and porosity.
JOURNAL OF MOLECULAR STRUCTURE
(2021)
Article
Chemistry, Physical
Julian Luttig, Stefan Mueller, Pavel Maly, Jacob J. Krich, Tobias Brixner
Summary: Transient absorption and coherent two-dimensional spectroscopy are commonly used methods for studying ultrafast dynamics in quantum systems. This article discusses the potential of higher-order pump-probe and multidimensional spectroscopy in providing insight into excited multiparticle states and their dynamics. The authors demonstrate how phase cycling can be used to isolate higher-order spectra in fluorescence-detected two-dimensional spectroscopy, and discuss the power of coherently detected fifth-order 2D spectroscopy in tracking exciton diffusion. They also show how higher-order signals can be extracted from ordinary pump-probe experiments to study multiexciton interactions and provide annihilation-free signals at high excitation densities.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Computer Science, Interdisciplinary Applications
Alexey E. Nazarov, Anatoly I. Ivanov
Summary: FSDS is a Fluorescence Spectral Dynamics Simulator implemented in C using the MPI library for investigating photoinduced charge transfer in dye solutions. It can simulate absorption and fluorescence spectra, population distribution evolution, dye excitation, and relaxation processes, fitting physical parameters to experimental data. The program code includes evolutionary models for spin-boson and stochastic models based on Smoluchowski diffusion operator.
COMPUTER PHYSICS COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Madhuri D. Prabhu, Jayashree Tonannavar, J. Tonannavar
Summary: A DFT tetramer model with multiple hydrogen bonds has been proposed for L-(+)-2-Chlorophenylglycine, showing unique characteristics in IR spectra and structure of molecular solids with specific H-bonding patterns. By computational analysis, the changes in UV spectra and the strength/stability of hydrogen bonds have been explained.
JOURNAL OF MOLECULAR STRUCTURE
(2021)
Article
Chemistry, Multidisciplinary
Marta Choluj, Josep M. Luis, Wojciech Bartkowiak, Robert Zalesny
Summary: Infrared spectroscopy is widely used in chemical laboratories to study molecular structures. This study combines computational methods and analytical potential-based approaches to analyze the impact of external confinement on vibrational transition intensities and frequencies of hydrogen-bonded complexes.
FRONTIERS IN CHEMISTRY
(2022)
Article
Chemistry, Physical
Daniel Konstantinovsky, Elsa C. Y. Yan, Sharon Hammes-Schiffer
Summary: The chemistry of interfaces is different from that of the bulk. Calculation of interfacial properties depends on the definition of the interface, which can yield ambiguous results. Voronoi tessellation provides a method to explicitly define interfaces and boundaries in molecular systems. This method has broad applications in spectroscopy and can provide insights into various systems.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Spectroscopy
Yukichi Kitamura, Hajime Torii
Summary: Relating vibrational properties to intermolecular configurations is crucial for accurate analysis and interpretation of spectra in condensed-phase systems. Through theoretical calculations on hydrogen-bonded water clusters, it is found that secondary descriptors related to the other OH bonds in the same water molecule significantly improve the performance of theoretical modeling, in addition to the primary descriptor related to the vibrating OH bond. The electric charge configuration is shown to be an important factor for good performance of the electric field descriptor.
JOURNAL OF RAMAN SPECTROSCOPY
(2022)
Article
Chemistry, Physical
Poornima Bhagavath, S. Mahabaleshwara, Sangeetha G. Bhat, D. M. Potukuchi, Prakasha Shetty, Srinivasulu Maddasani
Summary: Liquid crystalline behavior is observed in mixtures of low molecular weight dihalobenzoic acids and Schiff's base pyridyl units due to intermolecular hydrogen bonding. The complexes with 4-chloro-2-fluorobenzoic acid exhibit larger mesomorphic state compared to those with 2,4-dichlorobenzoic acid. The thermal range of the complexes initially increases and then decreases with the chain length of proton acceptors, with decyl homologue showing high liquid crystallinity in both series.
JOURNAL OF MOLECULAR LIQUIDS
(2021)