Interaction of Urea with p-Nitrophenol.

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概要

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• Urea(U) can abstract H<SUP>+</SUP> ion from <I>p</I>-nitrophenol (PNP) forming a hydrogen bonded ion pair (proton-transfer complex PNP<SUP>−</SUP> ···H<SUP>+</SUP>U) of 1 : 1 stoichiometry with a formation constant 0.42 at 303 K. Infrared spectral measurements of the uronium phenolate and uronium nitrate have supported that the proton transferred from PNP is attached to the oxygen center of the amide. The needle shaped light yellow urea–PNP adduct is fairly stable under ordinary conditions decomposing at 398 K. The standard free energy, enthalpy, and entropy of formation determined from spectrophotometric and calorimetric methods have been found to be 3.62 kJ mol<SUP>−1</SUP>, −13.30 kJ mol<SUP>−1</SUP>, and −57.5 J mol<SUP>−1</SUP> K<SUP>−1</SUP>, respectively at 303 K.

• 公益社団法人 日本化学会の論文

著者

• Das Gupta

  Department of Chemistry, Jadavpur University

• Das A.

  Polymer Science Unit, Indian Association for the Cultivation of Science

• Moulik S.

  Department of Chemistry, Jadavpur University

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• Interaction of Urea with p-Nitrophenol.

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