Lewis acid

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Lewis acid

[′lü·əs ‚as·əd]
(chemistry)
A substance that can accept an electron pair from a base; thus, AlCl3, BF3, and SO3 are acids.
References in periodicals archive ?
Atsushi, "Characterization of Lewis acidity of cationexchanged montmorillonite K-10 clay as effective heterogeneous catalyst for acetylation of alcohol," Journal of Molecular Catalysis A: Chemical, vol.
This can be explained by that, when the molar fraction of metal chloride (x) is more than 0.5, IL is BrAlnsted and Lewis acidic, and by increasing the x value, the strength of IL Lewis acidity also increases, which enhances the catalytic activity of IL.
It is essential that the sulfate species must contain strong covalence S=O bond that has a strong ability of inducing electron for the formation of solid super acid, which will enhance Lewis acidity of metal center ion.
The ability to easily adsorb moisture is a result of the strong Lewis acidity (electron acceptor character) of the surface of [gamma]-alumina.
Silica nanoparticles contain physically adsorbed water and hydroxyl groups on the surface but do not show significant Lewis acidity on the surface.
The suppression of the catalytic activity might be due to the variation in the Lewis acidity of the zinc site as well as changes in the morphological structure caused by the substituents.

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