A new type of aza-oxa macrocycles containing pyridine ring which may be used for binding of prinary ammonium cations(R-NH) were prepared from 2.6-di(bromomethyl) pyridine and appropriate diol.
Numerous studies have investigated the biosynthesis of pyridine heterocycles derived from nicotinic acid.How-ever,metabolic pathways generating pyridine heterocycles in nature remain uninvestigated.Here,we summarize r...Numerous studies have investigated the biosynthesis of pyridine heterocycles derived from nicotinic acid.How-ever,metabolic pathways generating pyridine heterocycles in nature remain uninvestigated.Here,we summarize recent contributions conducted in the last decade on the biosynthetic pathways of non-derivate from nicotinic acid pyridine rings and discuss their implication on the study of natural products with pyridine structures.展开更多
Polymeric carbon nitride(PCN)materials,as an emerging class of metal-free photocatalysts,have demonstrated significant potential in the field of solar energy conversion,particularly in areas of water splitting.But the...Polymeric carbon nitride(PCN)materials,as an emerging class of metal-free photocatalysts,have demonstrated significant potential in the field of solar energy conversion,particularly in areas of water splitting.But the utilization of PCN is restricted by its high carrier recombination rate and low charge transfer efficiency.In order to address these challenges,this work involves choosing pyridyl organic small molecules of nicotinic acid(NA)and melamine to construct donor–acceptor(D–A)-structured carbon nitride nanotubes.Pyridine heterocyclic rings are converged at the edge of the PCN structure via supramolecular self-assembly,facilitating the fabrication of donor–acceptor-structured carbon nitride nanotubes.The pyridine heterocyclic rings,with their strong electronic ability,create a preferred pathway for electronic transfer.This effectively mitigates carrier recombination within the molecular plane.In addition,the unique hollow tubular structure of carbon nitride nanotubes enhances their visible light absorption ability,expands the surface area of the catalyst,and then increases the number of catalytically active sites,which consequently enhances photocatalytic performance.The H_(2)production rates of one-dimensional tubular carbon nitride doped with 100 mg of NA(designated as NA100-CN)is 2584.2μmol g^(−1)h^(−1),which is 4.7 times that of pristine PCN.This investigation elucidates the mechanism of charge transfer from D to A,describing the response mechanism of photocatalysis,with profound implications for advancing clean energy,environmental preservation and sustainable development.展开更多
文摘A new type of aza-oxa macrocycles containing pyridine ring which may be used for binding of prinary ammonium cations(R-NH) were prepared from 2.6-di(bromomethyl) pyridine and appropriate diol.
基金This work was supported by the Edison Biotechnology Institute(EBI)and the Baker Fund at Ohio University.
文摘Numerous studies have investigated the biosynthesis of pyridine heterocycles derived from nicotinic acid.How-ever,metabolic pathways generating pyridine heterocycles in nature remain uninvestigated.Here,we summarize recent contributions conducted in the last decade on the biosynthetic pathways of non-derivate from nicotinic acid pyridine rings and discuss their implication on the study of natural products with pyridine structures.
基金financially supported by the National Natural Science Foundation of China(22202086,22208129)the Huaian City Science and Technology Plan Project(HAG202303).
文摘Polymeric carbon nitride(PCN)materials,as an emerging class of metal-free photocatalysts,have demonstrated significant potential in the field of solar energy conversion,particularly in areas of water splitting.But the utilization of PCN is restricted by its high carrier recombination rate and low charge transfer efficiency.In order to address these challenges,this work involves choosing pyridyl organic small molecules of nicotinic acid(NA)and melamine to construct donor–acceptor(D–A)-structured carbon nitride nanotubes.Pyridine heterocyclic rings are converged at the edge of the PCN structure via supramolecular self-assembly,facilitating the fabrication of donor–acceptor-structured carbon nitride nanotubes.The pyridine heterocyclic rings,with their strong electronic ability,create a preferred pathway for electronic transfer.This effectively mitigates carrier recombination within the molecular plane.In addition,the unique hollow tubular structure of carbon nitride nanotubes enhances their visible light absorption ability,expands the surface area of the catalyst,and then increases the number of catalytically active sites,which consequently enhances photocatalytic performance.The H_(2)production rates of one-dimensional tubular carbon nitride doped with 100 mg of NA(designated as NA100-CN)is 2584.2μmol g^(−1)h^(−1),which is 4.7 times that of pristine PCN.This investigation elucidates the mechanism of charge transfer from D to A,describing the response mechanism of photocatalysis,with profound implications for advancing clean energy,environmental preservation and sustainable development.
