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Type: Artigo de periódico
Title: Strong hydrogen bonds in dicarboxylics acids and aromatics diamines.
Author: Rodrigues, JAR
Abstract: A very short-strong hydrogen bond (<2 <Angstrom>, >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 (pK(a)) 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
Country: Brasil
Editor: Soc Brasileira Quimica
Citation: Quimica Nova. Soc Brasileira Quimica, v. 23, n. 6, n. 812, n. 817, 2000.
Rights: aberto
Date Issue: 2000
Appears in Collections:Unicamp - Artigos e Outros Documentos

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