The ammonia adduct of tris(pentafluorophenyl)boron, (C6F5)3B.NH3, is a potentially tri-functional hydrogen-bond donor. Co-crystallisation with the bases acetonitrile, pyridine, tetrahydrofuran, tetramethylethylenediamine, 15-crown-5, 1,4-diazabicyclo[2.2.2]octane (DABCO), pyrazine and 4,4'-bipyridine results, not in donor exchange, but in the formation of supermolecules assembled through hydrogen bonding to second coordination sphere acceptors. The complexes have been characterised by elemental analysis, multinuclear NMR and single-crystal diffraction methods. The solid-state architectures range in complexity, from the hydrogen bonded pairing of (C6F5)3B.NH3, with a single monodentate acceptor molecule (e.g. MeCN to form (C6F5)3B.NH3.NCMe), through complexation with all three N-H groups to the macrocycle 15-crown-5, to the formation of infinite one-dimensional chains with pyrazine and DABCO, and to two-dimensional networks with the divergent acceptor 4,4'-bipyridine.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1039/b808208a | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Aqueous solution of biogenic carboxylic acids as sustainable catalysts and green reaction media for the high-yielding synthesis of Biginelli adducts, Hantzsch esters, and substituted pyridines.
RSC Adv
December 2024
Department of Chemistry, National Institute of Technology Karnataka (NITK) Surathkal Mangalore-575025 India
3,4-Dihydropyrimidin-2(1)-ones (DHPMs) and 1,4-dihydropyridines (DHPs), prepared by applying the Biginelli and Hantzsch reaction protocols, respectively, are well-documented nitrogen-containing heterocycles with intriguing pharmacological properties. The aqueous solution of biogenic carboxylic acids renewably produced from biomass catalytic or enzymatic processes can be used as a sustainable catalyst and green reaction media for synthesizing DHPs and DHPMs. This work evaluates the efficacy of various biogenic acids in their aqueous solutions as catalysts for synthesizing DHPs and DHPMs from substituted benzaldehydes.
View Article and Find Full Text PDFThermal decomposition and atmospheric pressure chemical ionization of alanine using ion mobility spectrometry and computational study.
Heliyon
November 2024
Department of Chemistry, University of Zanjan, Zanjan, 38791-45371, Iran.
Article Synopsis
- The study focuses on how thermal decomposition affects the ion mobility spectrum of L-alanine using ion mobility spectrometry and computational methods.
- Key findings highlight that the ion mobility spectra are dominated by protonated isomers and adduct ions, with a preference for protonation at the nitrogen site over the oxygen site.
- The research also reveals that thermal decomposition produces ammonia, which plays a role in forming new adduct ions, offering valuable insights for analytical chemistry and biochemistry.
Boosting electrochemical ammonia synthesis via dynamic nitrogen carriers coupled with electron-rich Lewis acidic sites on TiO nanofiber.
J Colloid Interface Sci
February 2025
Innovation Center for Textile Science and Technology, College of Textiles, Donghua University, Shanghai 200051, China.
In light of the high energy consumption and substantial carbon emissions associated with traditional NH production based on the Haber-Bosch process, the aqueous electrochemical nitrogen reduction reaction (NRR) offers a clean and sustainable alternative production route. Nevertheless, activating the NN bonds at room temperature is challenging due to the high bond energy, severely hindering the development and commercialization of the electrochemical NRR. Herein, we report a synergistic strategy for achieving efficient N activation at ambient conditions that combines electrolyte engineering with catalytic site-modulated TiO nanofiber electrocatalysts.
View Article and Find Full Text PDFQuantitative Determination of Volatile -Nitrosamines in Meat Products Using Gas Chromatography Coupled to an Ion Mobility Spectrometer with an Ammonia Dopant.
J Agric Food Chem
October 2024
College of Chemical Engineering, Xiangtan University, Xiangtan 411105, China.
Article Synopsis
- A new method using gas chromatography-ion mobility spectrometry (IMS) with ammonia dopant is created to detect volatile nitrosamines in meat.
- The method enhances sensitivity and resolving power while reducing interference from dimer ions by using ammonia.
- It achieves detection limits between 0.78-1.79 ng/mL for nitrosamines, with good recovery rates, and successfully identifies these compounds in different meat products.
Synthesis and anti-ureolitic activity of Biginelli adducts derived from formylphenyl boronic acids.
Bioorg Chem
November 2024
Grupo de Estudos em Química Orgânica e Biológica (GEQOB), Departamento de Química, ICEx, Universidade Federal de Minas Gerais, 31270-901 Belo Horizonte, MG, Brazil. Electronic address:
Urease is a metalloenzyme that contains two Ni(II) ions in its active site and catalyzes the hydrolysis of urea into ammonia and carbon dioxide. The development of effective urease inhibitors is crucial not only for mitigating nitrogen losses in agriculture but also for offering an alternative treatment against infections caused by resistant pathogens that utilize urease as a virulence factor. This study focuses on synthesizing and investigating the urease inhibition potential of Biginelli Adducts bearing a boric acid group.
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!