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Precise Synthesis of Complex Si-Si Molecular Frameworks.
J Am Chem Soc
January 2025
Department of Chemistry, Johns Hopkins University, 3400 N. Charles St., Baltimore, Maryland 21218, United States.
In this Perspective, we highlight the emergence of target-oriented syntheses of complex molecules composed of Si-Si (oligosilanes) rather than C-C bonds. Saturated oligosilanes structurally resemble alkanes with respect to a tetrahedral geometry, a preference for a staggered conformation in linear chains, the ability to form stable small rings, and tetrahedral stereochemistry at asymmetrically functionalized Si centers. There are also critical differences, for example, differences in multiple bonding and the ability to form penta- and hexacoordinated structures, that mean that chemical reactivity and, in particular, rules for stereoselective synthesis do not cleanly translate from carbon to silicon.
View Article and Find Full Text PDFPreparation of a Self-Assembled Nanoantiviral Pesticide with Strong Adhesion Performance for Efficiency Control of Destructive .
J Agric Food Chem
January 2025
Department of Plant Biosecurity, College of Plant Protection, China Agricultural University, Beijing 100193, China.
In this context, we reported for the first time the design and development of a self-assembled nanoantiviral pesticide based on the star polycation (SPc) and the broad-spectrum fungicide/antiviral agent seboctylamine for field control of (SMV), a highly destructive plant virus in soybean crops. The SPc could self-assemble with seboctylamine through hydrogen bonds and van der Waals forces, and the complexation with SPc reduced the particle size of seboctylamine to form a spherical seboctylamine/SPc complex. In addition, the contact angle of seboctylamine decreased, and its retention increased with the aid of SPc, indicating excellent wetting properties and strong leaf surface adhesion performance.
View Article and Find Full Text PDFUpgrade of Weak σ-hole Bond Donors via Cr(CO)3 Complexation.
Chemistry
January 2025
Politecnico di Milano, Department of Chemistry, Materials, Chemical Engineer., via Mancinelli 7, 20131, Milan, ITALY.
Molecular recognition mediated by s-hole interactions is enhanced as the electrostatic potential at the σ-hole becomes increasingly positive. Traditional methods to strengthen σ-hole donor ability of atoms such as halogens often involve covalent modifications, such as, introducing electron-withdrawing substituents (neutral or positively charged) or electrochemical oxidation. Metal coordination, a relatively underexplored approach, offers a promising alternative.
View Article and Find Full Text PDFSupramolecularly Built Local Electric Field Microenvironment around Cobalt Phthalocyanine in Covalent Organic Frameworks for Enhanced Photocatalysis.
J Am Chem Soc
January 2025
Hefei National Research Center for Physical Sciences at the Microscale, Department of Chemistry, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China.
The local electric field (LEF) plays an important role in the catalytic process; however, the precise construction and manipulation of the electric field microenvironment around the active site remains a significant challenge. Here, we have developed a supramolecular strategy for the implementation of a LEF by introducing the host macrocycle 18-crown-6 (18C6) into a cobalt phthalocyanine (CoPc)-containing covalent organic framework (COF). Utilizing the supramolecular interaction between 18C6 and potassium ion (K), a locally enhanced K concentration around CoPc can be built to generate a LEF microenvironment around the catalytically active Co site.
View Article and Find Full Text PDFCharacterization by LC-MS/MS analysis of KLH vaccine conjugated with a tick antigen peptide.
Analyst
January 2025
Department of Proteomics, Mass Spectrometry Laboratory, Center for Genetic Engineering and Biotechnology, 31 Avenue, Cubanacan, Playa, Havana, Cuba.
Keyhole limpet haemocyanins (KLH1 and KLH2) from , are multi-subunit oxygen-carrying metalloproteins of approximately 3900 amino acids, that are widely used as carrier proteins in conjugate vaccines and in immunotherapy. KLHs and their derived conjugate vaccines are poorly characterized by LC-MS/MS due to their very stable supramolecular structures with megadalton molecular mass, and their resistance to efficient digestion with standard protocols. KLH1 and KLH2 proteins were conjugated to the conserved P0 peptide (pP0), derived from the P0 acidic ribosomal protein of sp.
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