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Type: Artigo de periódico
Title: Ligações hidrogênio fortes em ácidos dicarboxílicos e diaminas aromáticas
Title Alternative: Strong hydrogen bonds in dicarboxylics acids and aromatics diamines
Author: Rodrigues, José Augusto R.
Abstract: A very short-strong hydrogen bond (<2 Å, >20kcal/mol) is found in the monoanion of certain dicarboxylic acids derived from maleic and dialkylmalonic acids. Certain aromatic diamines that are known as proton sponge have exceptionally high basicity (pKa) and are only monoprotonated with strong acids like percloric acid. The closed proximity between the two basic centers provokes a strong steric interaction that is relieved upon protonation. Similar effects are found in dicarboxylic acids (hydrogen maleate and hydrogen dialkylmalonates) that present a very short distance between the two oxygens and a short-strong hydrogen bond.
Subject: short-strong hydrogen bond
hydrogen maleate
hydrogen malonates
proton sponge
Editor: Sociedade Brasileira de Química
Rights: aberto
Identifier DOI: 10.1590/S0100-40422000000600015
Date Issue: 1-Dec-2000
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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