The mobility and rearrangement of the C4H7(+) system over Chabazite were studied using ab initio molecular dynamics. The results indicated the high mobility of the cations, which can rearrange within picosecond time intervals. Experimental studies of nucleophilic substitution supported the theoretical findings.
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http://dx.doi.org/10.1039/c3cc40627j | DOI Listing |
J Am Chem Soc
January 2025
Department of Chemistry, University of California, Berkeley, California 94720-1460, United States.
Most conventional methods used to measure protein melting temperatures reflect changes in structure between different conformational states and are typically fit to a two-state model. Population abundances of distinct conformations were measured using variable-temperature electrospray ionization ion mobility mass spectrometry to investigate the thermally induced unfolding of the model protein cytochrome . Nineteen conformers formed at high temperature have elongated structures, consistent with unfolded forms of this protein.
View Article and Find Full Text PDFPhys Chem Chem Phys
January 2025
Institute of Physical Chemistry, Karlsruhe Institute of Technology (KIT), Germany.
Ion mobility spectrometry (IMS) (also including IMS-IMS measurements) as well as DFT calculations have been used to study isomer distributions and isomer interconversion in a range of electrospray-generated lanthanide chloride cluster anions, LnCl (where = 1-6, and Ln corresponds to the 15 lanthanide elements (except for radioactive Pm)). Where measurement and structural rearrangement timescales allow, we obtain almost quantitative agreement between experiment and theory thus confirming isomer predictions and reproducing isomer intensity ratios. LnCl structures reflect strong ionic bonding with limited directionality.
View Article and Find Full Text PDFAAPS J
December 2024
State Key Laboratory of Quality Research in Chinese Medicine, Institute of Chinese Medical Sciences, University of Macau, 999078, Macau, China.
Amorphous solid dispersions (ASDs) represent a promising strategy for enhancing the solubility of poorly soluble drugs. However, the mechanisms underlying the physical stability of ASDs remain insufficiently understood. This study aims to investigate these mechanisms and propose quantitative thresholds to predict the maximum stable drug loading using molecular dynamics simulations.
View Article and Find Full Text PDFACS Nano
November 2024
Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.
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