NMR of soft matter systems DOI
Matthew Wallace

Royal Society of Chemistry eBooks, Journal Year: 2024, Volume and Issue: unknown, P. 186 - 205

Published: Nov. 15, 2024

This chapter summarises recent advances and applications of solid-state, solution-state gel-state NMR techniques to study soft matter systems. Original research articles published between March 2023 2024 are discussed that cover surfactants, liquid crystals, polymer solutions, gels other Each section the review focuses on a different technique, including 1D 2D experiments, 2H NMR, nuclear Overhauser effect (NOE) saturation transfer difference (STD) pulsed-field gradient (diffusion) relaxation measurements, experiments quadrupolar counterions solid-state NMR.

Language: Английский

Operando Investigation of Sulfide-based All-solid-state Lithium Batteries via Raman Spectroscopy: A Review DOI

Chaohui Yuan,

Linlin Qin, Ge Xu

et al.

Energy storage materials, Journal Year: 2025, Volume and Issue: unknown, P. 104110 - 104110

Published: Feb. 1, 2025

Language: Английский

Citations

0
A green chemistry of the polymerization of methyl methacrylate (MMA) and a new copolymer of propylene oxide (PO) using natural catalysts DOI

Mohamed Benadda,

Karima Oussadi,

Boumediene Haddou

et al.

International Journal of Polymer Analysis and Characterization, Journal Year: 2025, Volume and Issue: unknown, P. 1 - 16

Published: March 13, 2025

Language: Английский

Citations

0
Direct Detection of Natural-Abundance Low-γ Nuclei NMR Signals of Minute Quantities of Organic Solids DOI
Zhiwei Yan,

Jiangying Li,

Hailu Zhang

et al.

Analytical Chemistry, Journal Year: 2025, Volume and Issue: unknown

Published: March 28, 2025

Low-γ nuclei signal enhancement in solid-state NMR spectroscopy is typically achieved via cross-polarization (CP) using abundant 1H polarization organic solids. Nevertheless, direct low-γ detection a single CP process quite challenging with minute quantities of samples due to the extremely limited signal-to-noise ratio (SNR) acquired spectra. Herein, we demonstrated robust performance multiple-contact experiment multiple acquisition periods (MCP) each transient scan, leading several-fold SNR over conventional single-CP at fast MAS conditions slightly increased experimental time. Spin thermodynamic analysis was further performed achieve maximum by adding obtained Nmax spectra from transient, where ∼ T1ρ/τcw. Here, T1ρ proton spin–lattice relaxation time rotating frame, and τcw total heteronuclear decoupling period. The theoretical good agreement results, more than 4.5-fold can be for pharmaceutical danazol/vanillin cocrystals. Besides, MCP also used T1 measurement high-resolution 13C detection, both serve as spectral-editing basis identify different immiscible components complex molecular systems.

Language: Английский

Citations

0
Catalysis for the Upcycling of Polymers DOI
Debanjali Dey, Manisha Sain,

Zahoor Manzoor

et al.

Published: April 4, 2025

Language: Английский

Citations

0
Transient NOE driven signal enhancement of INADEQUATE solid-state NMR spectroscopy for the structural analysis of rubbers DOI Creative Commons
Zhiwei Yan,

Yue-Qi Ye,

Rongchun Zhang

et al.

Magnetic Resonance Letters, Journal Year: 2024, Volume and Issue: 4(3), P. 200118 - 200118

Published: March 28, 2024

INADEQUATE (Incredible Natural Abundance DoublE QUAntum Transfer Experiment) is one of the most important techniques in revealing carbon skeleton organic solids solid-state NMR spectroscopy. Nevertheless, its use for structural analysis quite limited due to low natural abundance 13C–13C connectivity (∼0.01%) and thus sensitivity. Particularly, semi-solids like rubbers, sensitivity will be further significantly reduced by inefficient cross polarization from 1H 13C molecular motions induced averaging 1H–13C dipolar couplings. Herein, this study, we demonstrate that transient nuclear Overhauser effect (NOE) can used efficiently enhance signals, enable rapid acquisition two-dimensional (2D) spectra rubbers. Using chlorobutyl rubber as model system, it found an overall signal-to-noise ratio (SNR) enhancement about 22% achieved, leading significant time-saving 33% compared direct excitation-based experiment. Further experimental results on ethylene propylene diene monomer (EPDM) are also shown robust performance NOE enhanced

Language: Английский

Citations

1
Nondestructive techniques in pharmaceutical drug product characterization DOI
Sarwar Beg, Kailash Ahirwar, Waleed Hassan Almalki

et al.

Drug Discovery Today, Journal Year: 2024, Volume and Issue: unknown, P. 104249 - 104249

Published: Nov. 1, 2024

Language: Английский

Citations

1
Heterogenization of Palladium Trimer and Nanoparticles through Polymerization Boosted Catalytic Efficiencies in Recyclable Coupling and Reduction Reactions DOI
Miaomiao Wang,

Zhixin He,

Meng Chen

et al.

Chemistry - A European Journal, Journal Year: 2024, Volume and Issue: unknown

Published: Oct. 15, 2024

The development of heterogeneous palladium catalysts has shown continuous vitality in the field catalysis and materials. In this work, we report one concise free radical polymerization approach to accomplish aromatic trimer functionalized polymers PSS

Language: Английский

Citations

0
Proximity Effects and Aggregation of Hamilton‐Receptor Barbiturate Host‐Guest Complexes Probed by Cross‐Metathesis and ESI MS Analysis DOI Creative Commons
Chenming Li,

Pascal Mai,

Niclas Festag

et al.

Chemistry - A European Journal, Journal Year: 2024, Volume and Issue: 31(8)

Published: Nov. 12, 2024

Abstract The molecular environment around supramolecular bonding systems significantly affects their stability and the assembly of host–guest complexes, most prominent for hydrogen bonds (H‐bonds). Hamilton receptor‐barbiturate complexes are well‐known in solution, typically forming a 1 : molar ratio complex. However, within polymer matrix, these can form higher‐order assemblies, deviating from standard complex, which challenging to characterize often require lab‐intensive methods. In this study, novel receptor ( H ) was equipped with cyclopentene moieties used as host H−B allobarbital B ), followed by covalent crosslinking. UV‐Vis spectroscopy titration experiments different solvents at various temperatures revealed that polar containing additional H‐bonding sites reduce formation indicated reduced association constant. Higher‐order aggregates HH ‐dimer, HHH ‐trimer) were subsequently detected via an alkene cross‐metathesis CM reaction fix assemblies covalently, analysis electrospray ionization mass spectrometry (ESI MS). This two‐step method, firstly fixation ESI MS, extended study model complex polyisobutylene PIB presenting direct method analyze solvent‐free (polymer) environments.

Language: Английский

Citations

0
NMR of soft matter systems DOI
Matthew Wallace

Royal Society of Chemistry eBooks, Journal Year: 2024, Volume and Issue: unknown, P. 186 - 205

Published: Nov. 15, 2024

This chapter summarises recent advances and applications of solid-state, solution-state gel-state NMR techniques to study soft matter systems. Original research articles published between March 2023 2024 are discussed that cover surfactants, liquid crystals, polymer solutions, gels other Each section the review focuses on a different technique, including 1D 2D experiments, 2H NMR, nuclear Overhauser effect (NOE) saturation transfer difference (STD) pulsed-field gradient (diffusion) relaxation measurements, experiments quadrupolar counterions solid-state NMR.

Language: Английский

Citations

0