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Ingeniously regulating the conformational equilibrium and ESPT mechanism of HBT-DPI by solvent environment: A novel perspective.
Spectrochim Acta A Mol Biomol Spectrosc
January 2025
Jilin Key Laboratory of Solid-State Laser Technology and Application, School of Physics, Changchun University of Science and Technology, Changchun 130022 China. Electronic address:
HBT-DPI was a single-molecule multi-conformational fluorescent material and had unique applications for hydrophobic/hydrophilic mapping on large-scale heterogeneous surfaces. In this paper, the different proton transfer processes and luminescence mechanisms of HBT-DPI in Dichloromethane (DCM, no hydrogen bond (HB) receptor) and N, N-Dimethylformamide (DMF, HB receptor) solvents were systematically studied. Using the quantum chemistry method, the stable structures of HBT-DPI in two solvents were determined based on the Boltzmann distribution.
View Article and Find Full Text PDFIntramolecular Hydrogen Bonds Weaken Interaction Between Solvents and Small Organic Molecules Towards Superior Lithium-Organic Batteries.
Angew Chem Int Ed Engl
December 2024
Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Renewable Energy Conversion and Storage Center, Frontiers Science Center for New Organic Matter, College of Chemistry, Nankai University, Tianjin, 300071, P. R. China.
The strong interaction between organic electrode materials (OEMs) and electrolyte components induces a high solubility tendency of OEMs, thus hindering the practical application of lithium-organic batteries. Herein, we propose an efficient strategy for intramolecular hydrogen bonds (HBs) to redistribute the charge of OEMs to weaken the interaction with electrolyte components, thereby suppressing their dissolution. For the designed 2,2',2''-(2,4,6-trihydroxybenzene-1,3,5-triyl) tris (1H-naphtho[2,3-d]imidazole-4,9-dione) (TPNQ) molecule, the intramolecular HBs (O-H⋅⋅⋅N and N-H⋅⋅⋅O) reduce the charge density of active sites and alter the charge distribution on the molecular skeleton.
View Article and Find Full Text PDFProton transfer driven by the fluctuation of water molecules in chitin film.
J Chem Phys
October 2024
Faculty of Science and Engineering, Department of Life Science, Setsunan University, Neyagawa 572-8508, Japan.
Proton-transfer mechanisms and hydration states were investigated in chitin films possessing the functionality of fuel-cell electrolytes. The absolute hydration number per chitin molecule (N) as a function of relative humidity (RH) was determined from the OH stretching bands of H2O molecules, and the proton conductivity was found to enhance above N = 2 (80%RH). The FIR spectrum at 500-900 cm-1 for 20%RH (N < 1) together with first-principles calculations clearly shows that the w1 site has the same hydration strength as the w2 site.
View Article and Find Full Text PDFImproved ECG-gated cardiac cine imaging with variable initial value based tiny golden-angle radial trajectory.
Med Phys
December 2024
Medical Imaging Center, University of Science and Technology of China, Hefei, Anhui, China.
Background: Breath-held electrocardiogram-gated cardiac cine imaging (ECG-CINE), as the gold standard for assessing cardiac function in magnetic resonance imaging (MRI), is prone to motion artifacts. Conventional golden-angle (CGA) sampling has emerged as a promising technique for mitigating motion effects in real-time cardiac cine imaging. However, in ECG-CINE, the irregular re-binning of radial k-space profiles based on CGA can exacerbate k-space non-uniformity, resulting in severe streaking artifacts.
View Article and Find Full Text PDFUnderstanding Adult Central Nervous System Hemangioblastomas: A Systematic Review.
World Neurosurg
November 2024
Semmes Murphey Neurologic & Spine Institute, Memphis, Tennessee, USA; Department of Neurosurgery, University of Tennessee Health Science Center, Memphis, Tennessee, USA. Electronic address:
Background: Adult hemangioblastomas (HBs) are rare World Health Organization central nervous system (CNS) grade 1 tumors, particularly affecting the posterior cranial fossa. They exhibit a gender bias, impacting men in their fifth and sixth decades of life and manifesting sporadically or as part of von Hippel Lindau disease. Understanding the intricacies of CNS HBs is crucial for clinical decision-making.
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