A novel magnetic nanoparticle supported dual acidic ionic liquid catalyst was synthesized by anchoring 3-sulfobutyl-1-(3-propyltriethoxysilane) imidazolium hydrogen sulfate onto the surface of silica-coated Fe 3 O 4 nanoparticles. Due to the combination of nano-support features and flexible imidazolium linkers, it acted as a "quasi-homogeneous" catalyst to effectively catalyze the one-pot synthesis of benzoxanthenes by a three-component condensation of dimedone with aldehyde and 2-naphthol under solvent-free conditions. More importantly, the catalyst could be easily recovered by an external magnet and reused six times without significant loss of catalytic activity.
Fluorogens with aggregation-induced
emission (AIEgens) are a unique
type of luminescent materials for sensing and imaging applications.
The integration of AIE characteristics into metal–organic frameworks
(MOFs) structure is an emerging research field that has greatly advanced
the optical properties of MOFs. This Review mainly focuses on the
development of AIE MOFs with highlights on materials development and
their applications in analytical and biomedical fields. The first
part discusses the structure design for AIE MOF from the perspective
of linkers, metal nodes, and heterogeneous composites. The second
part summarizes the major mechanisms on the property modulation of
AIE MOFs in response to different stimuli based on fluorescence quenching,
in-situ restriction of intramolecular motion, and framework deformation
switches. The outlook elaborates on the potential of AIE MOFs, which
have opened a new dimension in luminescent material development.
The presence of among isolates collected from retail vegetables in China between 2015 and 2016 was investigated. Two and seven strains recovered from lettuce and tomato samples were identified as MCR-1-producers. Similar to isolates from animals and humans, the gene was located on the IncHI2/ST3, IncI2, or IncX4 plasmids. The presence of MCR-1-producing organisms in ready-to-eat food samples represents a serious risk for human health.
A new recyclable temperature-dependant phase-separation system comprised of PEG-1000-based dicationic acidic ionic liquid and toluene was developed and used in one-pot three-component condensation to prepare benzopyrans in excellent yields (up to 93%).
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