1,1,1,3,3,3-hexafluoro-propan-2-ol aggregates preferentially into an achiral dimer of achiral monomers, but the trimer is found to prefer three metastable chiral monomer units arranged into a strained OH⋅⋅⋅O hydrogen-bonded ring, which is reinforced by secondary CH⋅⋅⋅FC interactions. This is shown by a combination of infrared, microwave, and Raman spectroscopy in supersonic jet expansions and supported by high-level quantum chemical calculations. It involves an activation of the monomers by >15 kJ mol , clearly driven by the much stronger hydrogen-bond interaction available to the gauche and even more to the cis monomer units.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/anie.201813881 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Observation of magnetic skyrmion lattice in CrMnGe by small-angle neutron scattering.
Sci Rep
January 2025
Helmholtz-Zentrum Berlin für Materialien und Energie, 13109, Berlin, Germany.
Incommensurate magnetic phases in chiral cubic crystals are an established source of topological spin textures such as skyrmion and hedgehog lattices, with potential applications in spintronics and information storage. We report a comprehensive small-angle neutron scattering (SANS) study on the B20-type chiral magnet Cr[Formula: see text]Mn[Formula: see text]Ge, exploring its magnetic phase diagram and confirming the stabilization of a skyrmion lattice under low magnetic fields. Our results reveal a helical ground state with a decreasing pitch from 40 to 35 nm upon cooling, and a skyrmion phase stable in applied magnetic fields of 10-30 mT, and over an unusually wide temperature range for chiral magnets of 6 K ([Formula: see text], [Formula: see text] K).
View Article and Find Full Text PDFUnveiling Chirality in MoS Nanosheets: A Breakthrough in Phase Engineering for Enhanced Chiroptical Properties.
Angew Chem Int Ed Engl
January 2025
Department School of Chemistry, CRANN and AMBER Research Centres, Institution Trinity College Dublin, College Green, Dublin 2, Ireland.
The development of new synthetic strategies to introduce and control chirality in inorganic nanostructures has been highly stimulated by the broad spectrum of potential applications of these exiting nanomaterials. Molybdenum disulfide is among the most investigated transition metal dichalcogenides due to its promising properties for applications that spread from optoelectronic to spintronic. Herein, we report a new two-step approach for the production of chiroptically active semiconductor 2H MoS nanosheets with chiral morphology based on the manipulation of their crystallographic structure.
View Article and Find Full Text PDFAnomalous and large topological Hall effects in-Mn chiral compound CoRuZnMn: electron electron interaction facilitated quantum interference effect.
J Phys Condens Matter
January 2025
CMP Division, Saha Institute of Nuclear Physics, A CI of Homi Bhabha National Institute, Kolkata 700064, India.
-Mn-type chiral cubic CoZnMn(++= 20) alloys present a intriguing platform for exploring topological magnetic orderings with promising spintronic potential. This study examines the magnetotransport properties of CoRuZnMn, a skyrmion-hosting-Mn-type chiral compound. The longitudinal resistivity () exhibits field-insensitive low-temperature minima due to quantum interference effects, driven byT1/2-dependent electron-electron interactions.
View Article and Find Full Text PDFPhotopatterned Anchoring Stabilizing Monodomain Blue Phases.
ACS Appl Mater Interfaces
December 2024
Liquid Crystals and Photonics Group, Department of Electronics and Information Systems, Ghent University, 9052 Ghent, Belgium.
Blue phase liquid crystals (BPLCs) are chiral self-assembled three-dimensional (3D) periodic structures which have attracted a lot of attention due to their electro-optical properties, relevant for tunable soft photonic crystals and fast-response displays. However, to realize this application potential, controlling the BPLC alignment at the surfaces is crucial, and one way to obtain the desired alignment is by photoalignment patterning. In this article, monodomain BPLC samples with controlled orientation are achieved by imposing different alignment patterns that have a periodicity that is compatible with the size of the BPLC unit cell, using two-step photoalignment with polarized ultraviolet (UV) light.
View Article and Find Full Text PDFDeep Learning Enhanced in Situ Atomic Imaging of Ion Migration at Crystalline-Amorphous Interfaces.
Nano Lett
November 2024
Beijing Advanced Innovation Center for Intelligent Robots and Systems and School of Medical Technology, Beijing Institute of Technology, Beijing 100081, China.
Article Synopsis
- Understanding ion transport at interfaces is crucial for enhancing energy storage and neuromorphic computing but is complicated by atomic changes and limited imaging techniques.
- A new in situ electric manipulator in a high-tech microscope, along with deep learning for image enhancement, improves atomic observation threefold, allowing for analysis of potassium ion migration in antimony selenide.
- The study uncovers a stable insertion pathway for potassium ions and unexpected changes during their extraction, aiding in the design of better nanostructured materials.
Want 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!