Metal-ion complexation of noncyclic poly(oxyethylene) derivatives. II. PMR studies of the complexation with alkali and alkaline-earth metal cations.

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概要

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• The complexation of homogeneous polyethylene glycols and their dimethyl ethers(glymes) with alkali and alkaline-earth metal cations was studied by PMR spectroscopy on the basis of a comparison with crown ethers. The ethylene proton signal of octaethylene glycol in methanol-<I>d</I><SUB>4</SUB> was split into three lines by the addition of a potassium, rubidium, caesium, strontium, or barium cation. The latter two cations also caused large downfield shifts of the signals, which are quite comparable with those of 15-crown-5 and 18-crown-6 caused by the same metal cations. As for heptaethylene glycol, a splitting was observed in the presence of a strontium ion or an alkali metal cation except for a lithium ion. A large downfield shift was also observed in the presence of a strontium or barium ion. As for hexaethylene glycol, the signal was split only by a sodium ion, and the optimal interaction with a calcium ion was confirmed on the basis of the downfield shift. In methanol-<I>d</I><SUB>4</SUB>, lithium and magnesium ions did not cause any change in the PMR spectra of either the crown ethers or the glycols. The PMR downfield-shift method also disclosed the metal-ion complexation of the glycols in water. The terminal hydroxyl groups play an important role in the complexation.

• 公益社団法人 日本化学会の論文

著者

• OKAHARA Mitsuo

  Department of Applied Chemistry, Faculty of Engineering, Osaka University

• Yanagida Shozo

  Department of Applied Chemistry, Faculty of Engineering, Osaka University

• Takahashi Kazutomo

  Department of Applied Chemistry, Faculty of Engineering, Osaka University

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