The Formation and Structure of Copper(II) Complexes with Cyclodextrins in an Alkaline Solution

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概要

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• Copper(II) forms a 2: 1 complex with cyclodextrin in an alkaline solution. The complexes with α- and β-cyclodextrins were isolated from solutions by the addition of ethanol. They are labile, and, upon heating, the Cu(II) is reduced to Cu(0). The role of the hydroxide ion was examined by means of potentiometrie and conductometric titrations; it was found that the reaction of 1 mol of α-cyclodextrin with 2 mol of Cu(OH)<SUB>2</SUB>consumes 2 mol of the hydroxide ion, whereas 3 mol of the hydroxide ion are consumed for the reaction of β-cyclodextrin. Polarimetric measurements showed that the optical rotation of cyclodextrin changes from dextrorotatory to levorotatory upon the formation of the Cu(II)-cyclodextrin complex. It was suggested, with a molecular model, that the two pairs of <I>C</I><SUB>2</SUB> and <I>C</I><SUB>3</SUB>′ secondary hydroxyl groups of contiguous glucose units are cross-linked by the Cu(OH<SUP>−</SUP>)<SUB>2</SUB>Cu ion bridge in the α-cyclodextrin complex and by Cu(OH<SUP>−</SUP>)(O<SUP>2−</SUP>)Cu ion bridge in the β-cyclodextrin complex. Furthermore, the circular ring of cyclodextrin may be distorted to the ellipsoidal form by the complex formation, causing a pronounced change in the optical rotation.

• 公益社団法人 日本化学会の論文

著者

• MATSUI Yoshihisa

  Department of Life Science and Biotechnology Faculty of Life and Environmental Science Shimane Unive

• Yagi Masao

  Department Of General Surgery Mattou Ishikawa Central Hospital

• Mochida Kazuo

  Department of Agricultural Chemistry, Shimane University

• Kurita Toyoaki

  Department of Agricultural Chemistry, Shimane University

• Okayama Tetsuo

  Department of Agricultural Chemistry, Shimane University

• Date Yoshio

  Department of Agricultural Chemistry, Shimane University

• Date Yoshio

  Department of Agricultural Chemistry, Faculty of Agriculture, Shimane University

• Kurita Toyoaki

  Department of Agricultural Chemistry, Faculty of Agriculture, Shimane University

• Matsui Yoshihisa

  Department of Agricultural Chemistry, Faculty of Agriculture, Shimane University

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