Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1103/PhysRevLett.66.1505 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
NH(CH)CuCl Organic-Inorganic Hybrid Perovskite: Consideration to Crystal Structure, Thermodynamics, and Structural Molecular Dynamics.
ACS Omega
August 2024
Department of Energy Convergence Engineering, Cheongju University, Cheongju 28503, South Korea.
The crystal structure of NH(CH)CuCl, an organic-inorganic hybrid perovskite, undergoes a phase transition from triclinic to monoclinic at the phase transition temperature of 287 K. We investigated the temperature dependencies of NMR chemical shifts and spin-lattice relaxation time to gain insights into the structural geometry and molecular dynamics during the transition from phase II to phase I at high temperatures. Analysis of the H and C NMR chemical shifts of the cation revealed a continuous change in the surrounding structural geometry with temperature, without any anomalous changes around .
View Article and Find Full Text PDFEvidence for NMR Relaxation Enhancement in a Protic Ionic Liquid by the Movement of Protons Independent of the Translational Diffusion of Cations.
J Phys Chem B
July 2024
Institute of Molecular Physics, Polish Academy of Sciences, M. Smoluchowskiego 17, Poznań 60-179, Poland.
The molecular dynamics, thermal stability, and ionic conductivity were studied in the protic ionic liquid 1-methylimidazolium bis(trifluoromethylsulfonyl)imide ([MIm][TFSI]). The relaxation of the H spin-lattice of cations in the measured frequency range (10 kHz to 20 MHz) and temperature (298 to 343 K) is sensitive mainly to slow processes occurring in the molecular dynamics of protic ionic liquid and dominated by the contribution of intermolecular translational diffusion. Molecular rotations give only a constant contribution and become significant in the higher frequency range.
View Article and Find Full Text PDFA Numerical simulation method for analyzing H spin diffusion NMR for Multicomponent and multiphase polymer systems.
Solid State Nucl Magn Reson
August 2024
National Synchrotron Radiation Laboratory, Anhui Provincial Engineering Laboratory of Advanced Functional Polymer Film, CAS Key Laboratory of Soft Matter Chemistry, University of Science and Technology of China, Hefei, 230026, China; Department of Accelerator Science and Engineering Physics, School of Nuclear Science and Technology, University of Science and Technology of China, Hefei, 230026, China. Electronic address:
A numerical simulation method, namely, SDNMR-WEBFIT, is reported for simulating proton spin diffusion NMR based on the Levenberg-Marquardt algorithm and a pseudo-2D diffusion model. This method is used for the precise quantification of dynamics heterogeneity of the interphase within multiphase polymer systems. The numerical simulation method provides measurements of spin-lattice relaxation time (T), proton density (ρ), lamellar thickness (d), and spin diffusion coefficient (D) for each component.
View Article and Find Full Text PDFAnisotropic relaxation of nuclear spins dipolar energy of water molecules in two-dimensional nanopores - A single crystal NMR study.
Solid State Nucl Magn Reson
August 2024
Department of Physics, Chalmers University of Technology, SE-412 96, Göteborg, Sweden.
Energy transfer from Zeeman to dipolar order discovered by Jeener et al. is usually observed in solids with a strong dipole-dipole interaction of nuclear spins. It is not observed in liquids, where fast molecular motion completely averages this interaction.
View Article and Find Full Text PDFProbing structural and dynamic properties of MAPbCl hybrid perovskite using Mn EPR.
Dalton Trans
April 2024
Faculty of Physics, Vilnius University, Sauletekio 3, 10257 Vilnius, Lithuania.
Hybrid methylammonium (MA) lead halide perovskites have emerged as materials exhibiting excellent photovoltaic performance related to their rich structural and dynamic properties. Here, we use multifrequency (X-, Q-, and W-band) electron paramagnetic resonance (EPR) spectroscopy of Mn impurities in MAPbCl to probe the structural and dynamic properties of both the organic and inorganic sublattices of this compound. The temperature dependent continuous-wave (CW) EPR experiments reveal a sudden change of the Mn spin Hamiltonian parameters at the phase transition to the ordered orthorhombic phase indicating its first-order character and significant slowing down of the MA cation reorientation.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!