Assembly of co-bimb-polyoxotungstate hybrids: from 1D chain to 3D framework influenced by the charge of Keggin anions
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Two new compounds with bifunctional electrocatalytic activities have been obtained, which shows that the charge of the Keggin anions is a key factor to control the dimension of the hybrid compounds.Cite
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In this report, we demonstrate that self-aggregation is an intrinsic problem of bifunctional organocatalysts, especially in the case when the substrates do not have functional groups which are able to bind strongly with catalyst. Due to their self-association phenomena, the enantioselectivity of bifunctional catalysts dramatically decreases with increasing catalyst concentration or decreasing temperature. Thus, when the substrate concentration is kept constant, the enantioselectivity of bifunctional catalysts dramatically increases with decreasing catalyst loading. The ee values obtained at different catalyst concentrations are fairly consistent with the diffusion coefficients (D) of the catalysts, strongly indicating that their degree of self-association plays a crucial role in determining their enantioselectivity.
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C. F. Poole, S. Singhawangcha and A. Zlatkis, Analyst, 1979, 104, 82 DOI: 10.1039/AN9790400082
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A bifunctional luminescent Eu-MOF can be applied as a highly selective and sensitive bifunctional luminescence sensor to detect NB and 4-AP through an energy competition mechanism with low detection limits of 5–70 ppm and 5–110 ppm, respectively.
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Europium
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This article illustrates the modification of oxide surfaces with organic amine functional groups to create acid-base bifunctional catalysts, summarizing our previous reports and also presenting new data. Immobilization of organic amines as bases on inorganic solid-acid surfaces afforded highly active acid-base bifunctional catalysts, which enabled various organic transformations including C--C coupling reactions, though these reactions did not proceed with either the homogeneous amine precursors or the acidic supports alone. Spectroscopic characterization, such as by solid-state MAS NMR and FTIR, revealed not only the interactions between acidic and basic sites but also bifunctional catalytic reaction mechanisms.
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Organic base
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Acid–base reaction
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Correction for ‘Effects of the support on bifunctional one-step synthesis of methylal via methanol oxidation catalysed by Fe–Mo-based bifunctional catalysts’ by Meng Yuan et al. , Sustainable Energy Fuels , 2021, 5 , 246–260, https://doi.org/10.1039/D0SE01194K.
Bifunctional catalyst
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Abstract Homo‐ and hetero‐bifunctional linkers play vital roles in constructing a variety of functional systems, ranging from protein bioconjugates with drugs and functional agents, to surface modification of nanoparticles and living cells, and to the cyclization/dimerization of synthetic polymers and biomolecules. Conventional approaches for assaying conjugation extents typically rely on ex situ techniques, such as mass spectrometry, gel electrophoresis, and size‐exclusion chromatography. If the conjugation process involving bifunctional linkers was rendered fluorogenic, then in situ monitoring, quantification, and optical tracking/visualization of relevant processes would be achieved. In this review, conventional non‐fluorogenic linkers are first discussed. Then the focus is on the evolution and emerging applications of fluorogenic bifunctional linkers, which are categorized into hetero‐bifunctional single‐caging fluorogenic linkers, homo‐bifunctional double‐caging fluorogenic linkers, and hetero‐bifunctional double‐caging fluorogenic linkers. In addition, stimuli‐cleavable bifunctional linkers designed for both conjugation and subsequent site‐specific triggered release are also summarized.
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