dorsal/arxiv
View SchemaAre Strong Bronsted Acids Necessarily Strong Lewis Acids?
| Authors | K. Gupta, D. R. Roy, V. Subramanian, P. K. Chattaraj |
|---|---|
| Categories | |
| ArXiv ID | physics/0611211 |
| URL | https://arxiv.org/abs/physics/0611211 |
Abstract
The Broensted and Lowry acid base theory is based on the capacity of proton donation or acceptance (in the presence or absence of a solvent) whereas the Lewis acid base theory is based on the propensity of electron pair acceptance or donation. We explore through DFT calculation the obvious question whether these two theories are in conformity with each other. We use pKa as the descriptor for the Broensted and Lowry acidity. The DFT descriptors like ionization potential, electron affinity, electronegativity, hardness and global electrophilicity are computed for 58 organic and inorganic acids. The fractional electron transfer, del(N) and the associated energy change, del(E) for the reaction of these acids with trimethyl amine (a strong base) are used as the possible descriptors for the Lewis acidity. A near exponential decrease in del(N) and (-del(E)) values is observed in general with an increase in pKa values. The findings reveal that a stronger Broensted acid in most cases behaves as a stronger Lewis acid as well. However it is not necessarily true for all acids.
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"abstract": "The Broensted and Lowry acid base theory is based on the capacity of proton\ndonation or acceptance (in the presence or absence of a solvent) whereas the\nLewis acid base theory is based on the propensity of electron pair acceptance\nor donation. We explore through DFT calculation the obvious question whether\nthese two theories are in conformity with each other. We use pKa as the\ndescriptor for the Broensted and Lowry acidity. The DFT descriptors like\nionization potential, electron affinity, electronegativity, hardness and global\nelectrophilicity are computed for 58 organic and inorganic acids. The\nfractional electron transfer, del(N) and the associated energy change, del(E)\nfor the reaction of these acids with trimethyl amine (a strong base) are used\nas the possible descriptors for the Lewis acidity. A near exponential decrease\nin del(N) and (-del(E)) values is observed in general with an increase in pKa\nvalues. The findings reveal that a stronger Broensted acid in most cases\nbehaves as a stronger Lewis acid as well. However it is not necessarily true\nfor all acids.",
"arxiv_id": "physics/0611211",
"authors": [
"K. Gupta",
"D. R. Roy",
"V. Subramanian",
"P. K. Chattaraj"
],
"categories": [
"physics.chem-ph"
],
"title": "Are Strong Bronsted Acids Necessarily Strong Lewis Acids?",
"url": "https://arxiv.org/abs/physics/0611211"
},
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