616-47-7Relevant articles and documents
Selective N-Alkylation of Imidazole with Alcohols over Calcined Layered Double Hydroxides
Santhanalakshmi, Jayadevan,Raja, Thirumalaiswamy
, p. 2829 - 2831 (1997)
Vapor-phase N-alkylation syntheses of imidazole were carried out with MeOH and EtOH over a series of calcined MgII-AlIII layered double hydroxides (LDHs) selectively produced in high yields of N-methyl (70%) and N-ethyl (63%) imidazoles only on the 3 : 1 atomic ratio of MgII-AlIII calcined LDH. Attempts on C-alkylation and dialkylation reactions over the same catalysts proved to be unsuccessful.
Crystallographic and spectroscopic analysis of 9,10-bis-alkyl imidazolium anthracene hexatungstate supramolecular complexes
Annapareddy, Gayatri,Mubeena, Shaik,N, Meghana,Sarma, Monima
, (2021/06/28)
This article describes the ionic and supramolecular association of bis-dialkyl imidazolium anthracene dications with hexametalate cluster anions. In the relevant compounds, the length of the alkyl chain was varied to observe its effect on the crystal packing. Despite the endothermicity in the crystals due to structural incompatibility between planar anthracene and spherical polyoxometalate ion, packing stability is attained by coulombic interaction together with the supramolecular interactions between the components. The nature of supramolecular interactions depends on the number of carbon atoms in the alkyl chain in the organic counterparts of the crystals which ultimately modifies the packing pattern.
Amphiphilic Polymeric Nanoparticles for Photoredox Catalysis in Water
Eisenreich, Fabian,Meijer,Palmans, Anja R. A.
supporting information, p. 10355 - 10361 (2020/07/27)
Photoredox catalysis has recently emerged as a powerful synthesis tool in organic and polymer chemistry. In contrast to the great achievements realized in organic solvents, performing photocatalytic processes efficiently in aqueous media encounters several challenges. Here, it is presented how amphiphilic single-chain polymeric nanoparticles (SCPNs) can be utilized as small reactors to conduct light-driven chemical reactions in water. By incorporating a phenothiazine (PTH) catalyst into the polymeric scaffold, metal-free reduction and C?C cross-coupling reactions can be carried out upon exposure to UV light under ambient conditions. The versatility of this approach is underlined by a large substrate scope, tolerance towards oxygen, and excellent recyclability. This approach thereby contributes to a sustainable and green way of implementing photoredox catalysis.
Molecular tunability of surface-functionalized metal nanocrystals for selective electrochemical CO2 reduction
Pankhurst, James R.,Guntern, Yannick T.,Mensi, Mounir,Buonsanti, Raffaella
, p. 10356 - 10365 (2019/11/20)
Organic ligands are used in homogeneous catalysis to tune the metal center reactivity; in contrast, clean surfaces are usually preferred in heterogeneous catalysis. Herein, we demonstrate the potential of a molecular chemistry approach to develop efficient and selective heterogeneous catalysts in the electrochemical CO2 reduction reaction (CO2RR). We have tailor-made imidazolium ligands to promote the CO2RR at the surface of hybrid organic/inorganic electrode materials. We used silver nanocrystals for the inorganic component to obtain fundamental insights into the delicate tuning of the surface chemistry offered by these ligands. We reveal that modifying the electronic properties of the metal surface with anchor groups along with the solid/liquid interface with tail groups is crucial in obtaining selectivities (above 90% FE for CO), which are higher than the non-functionalized Ag nanocrystals. We also show that there is a unique dependency of the CO2RR selectivity on the length of the hydrocarbon tail of these ligands, offering a new way to tune the interactions between the metal surface with the electrolyte and reactants.
