NMR Studies on Proton Transfer between Hydration- and Solvent-Water Molecules in Aqueous Solution of AlCl_3

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概要

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• Proton resonance at 40.5Mc for the AlCl_3 solutions was studied at various pH and the temperature down to -29.5℃. The separate signals one for coordinated and the other for bulk water were observed at sufficiently low temperature. The former is separated from the latter to the lower side of magnetic field by 182.6cps. three kinds of reaction of proton exchanges, are assumed, namely (1) the proton transfer from Al^<+++>(H_2O)_6 to H_2O, (2) the proton transfer from Al^<+++>(H_2O)_6 to Al^<+++>(OH)-(H_2O)_5 via H_2O, and (3) the exchange of water molecule between solvation shell of Al^<+++> and of H+. The corresponding rate constants k_2 and k_3 at -29.5℃ in the reactions (2) and (3) were found to be 2.2×10^5sec^<-1> mole^<-1> 1H_2O and 1.8×10^<-4>sec^<-1> mole^<-1> 1H_2O respectively, and their activation enthalpies ΔH_2^* and ΔH_3^* were 20.9kcal/mole and 4.9kcal/mole respectively. The rate due to the reaction (1) was negligible as compared with those of the reaction (2) and (3).

• 社団法人日本物理学会の論文
• 1970-01-05

著者

• Takahashi Akira

  The Institute For Solid State Physics The University Of Tokyo:department Of Physics Faculty Of Techn

• Takahashi Akira

  The Institute For Solid State Physics University Of Tokyo:department Of Mathematics And Physics Facu

関連論文

• The Proton NMR Shifts and the Local Electric Field in Solid MgCl_2・6H_2O and in AlCl_3 Solution
• NMR Studies on Proton Transfer between Hydration- and Solvent-Water Molecules in Aqueous Solution of AlCl_3
• Proton NMR Shift in the Powder of MgCl_2・6H_2O

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