Chiral recognition among three differently functionalized heptahelicene derivatives on Ag(111) and Au(111) surfaces has been studied with scanning tunnelling microscopy. All three species were found to self-assemble into racemic zigzag structures, with alternation of (M)- and (P)-enantiomers.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1039/c9cc05317d | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Intermolecular Interactions between Aromatic Amino Acids Investigated by Ultraviolet Photodissociation Spectroscopy of Hydrogen-Bonded Clusters of Histidine and Tryptophan Enantiomers.
Mass Spectrom (Tokyo)
November 2024
Department of Chemistry, Graduate School of Science, Osaka Metropolitan University, Osaka 558-8585, Japan.
Intermolecular interactions between aromatic amino acids were investigated by ultraviolet photodissociation spectroscopy of hydrogen-bonded protonated clusters of histidine (His) and tryptophan (Trp) enantiomers in the gas phase. Product ion spectra and photodissociation spectra in the wavelength range of the S-S transition of Trp at several temperatures (8-100 K) were obtained using a tandem mass spectrometer equipped with an electrospray ionization source and a cold ion trap. l-Trp detachment forming protonated His was the main pathway.
View Article and Find Full Text PDFUnraveling the Source of Self-Induced Diastereomeric Anisochronism in Chiral Dipeptides.
Chemistry
October 2024
Department of Chemistry and Industrial Chemistry, University of Pisa, Via G. Moruzzi 13, 56124, Pisa, Italy.
Mastering of analytical methods for accurate quantitative determinations of enantiomeric excess is a crucial aspect in asymmetric catalysis, chiral synthesis, and pharmaceutical applications. In this context, the phenomenon of Self-Induced Diastereomeric Anisochronism (SIDA) can be exploited in NMR spectroscopy for accurate determinations of enantiomeric composition, without using a chiral auxiliary that could interfere with the spectroscopic investigation. This phenomenon can be particularly useful for improving the quantitative analysis of mixtures with low enantiomeric excesses, where direct integration of signals can be tricky.
View Article and Find Full Text PDFDirect Readout of Homo- vs Heterochiral Ligand Shell of Quantum Dots.
ACS Appl Mater Interfaces
July 2024
Institute of Physical Chemistry Polish Academy of Sciences, Kasprzaka 44/52 , Warsaw 01-224, Poland.
The chiroptical activity of various semiconductor inorganic nanocrystalline materials has typically been tested using circular dichroism or circularly polarized luminescence. Herein, we report on a high-throughput screening method for identifying and differentiating chiroptically active quantum-sized ZnO crystals using Raman spectroscopy combined with principal component analysis. ZnO quantum dots (QDs) coated by structurally diverse homo- and heterochiral aminoalcoholate ligands (- and -1-amino-2-indanolate, 2-amino-1-phenylethanolate, and diphenyl-2-pyrrolidinemethanolate) were prepared using the one-pot self-supporting organometallic procedure and then extensively studied toward the identification of specific Raman fingerprints and spectral variations.
View Article and Find Full Text PDFChiral Self-Sorting, Spontaneous Resolution, and Hierarchical Self-Assembly in Metal-Organic Cages.
Small
September 2024
Organic and Medicinal Chemistry Division, CSIR-Indian Institute of Chemical Biology, 4 Raja S C Mullick Road, Kolkata, 700032, India.
The ability to collectively program chiral recognition and the hierarchical self-assembly of molecular and supramolecular building blocks into complex higher-order superstructures is a significant goal in supramolecular chemistry. Metal-organic cages are excellent model systems to examine chiral self-sorting and build hierarchical self-assembly. Herein, details on how limiting the conformational flexibility and incorporating hydrogen bonding functional groups in the ligands can influence chiral self-sorting and hierarchical self-assembly of metal-organic cages are reported.
View Article and Find Full Text PDFMacrocycle-Based Charge Transfer Cocrystals with Dynamically Reversible Chiral Self-Sorting Display Chain Length-Selective Vapochromism to Alkyl Ketones.
Angew Chem Int Ed Engl
July 2024
Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Molecular Recognition and Function, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.
Article Synopsis
- Chirality-driven self-sorting is vital for biosystems, like DNA, but achieving control over these structures and their properties remains difficult, especially for dynamic regulation.
- A new saucer[4]arene-based system has been developed that allows for reversible chiral self-sorting, influenced by a chiral macrocycle and organic vapors, showcasing unique vapor-responsive behavior.
- This research reveals how different alkyl ketone guests can lead to varying optical properties due to the formation of distinct self-sorted assemblies, emphasizing the importance of chiral self-sorting in creating advanced vapor-sensing technologies.
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!