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- W2801167789 abstract "Abstract By means of MP2 and DFT computations we predict gas‐phase acidities and liquid‐phase (MeCN) acidities of (di)carboxylic acids derived from icosahedral ortho , meta , and para ‐carboranes. For comparative purpose, we include the benzoic and phthalic acids. Substitution of benzene by a carborane cage – cage effect – strikingly increases the gas‐phase acidity (lower GA) for the (di)carboxylic acids, being the ortho isomers always the most acidic, following the order ortho ≫ meta > para . The computed GA of the dicarboxylic acid derived from ortho ‐carborane is far lower than sulphuric acid, due to an enhanced stabilization of the carboxylate through an intramolecular OHO bridge connection, also taking place in phthalic acid. The change of GA relative to ortho , meta and para positions of the carboxylic groups ‐ isomer effect ‐ is larger for carboranes. As regards to liquid‐phase (MeCN), the computations show that carborane (di)carboxylic acids also show a larger acidity (lower pK a ) as compared to the phthalic acids and that the dicarboxylic ortho ‐carborane is also a superacid in the liquid phase (MeCN), due to the OHO bridge connection in the carboxylate, as in the gas phase. Additional computations show how much of this isomeric effect is to be attributed to the electronic delocalization." @default.
- W2801167789 created "2018-05-17" @default.
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- W2801167789 date "2018-04-24" @default.
- W2801167789 modified "2023-10-17" @default.
- W2801167789 title "Predicted Gas-Phase and Liquid-Phase Acidities of Carborane Carboxylic and Dicarboxylic Acids" @default.
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- W2801167789 doi "https://doi.org/10.1002/slct.201800683" @default.
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