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島根大学農学部研究報告 14 巻
1980-12-15 発行
β-シクロデキストリン2級水酸基のβ-アミノエチルアミノ基による修飾とその誘導体の金属錯体について
Modification of a sec-Hydroxyl Group of β-Cyclodextrin with a β-Aminoethylamino Group and the Metal Complexes with the Derivative
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Mono-(3-β-aminoethylamino-3-deoxy)-β-cyclodextrin (CD-3-en) was synthesized by the tosylation of one of the secondary hydroxyl groups of β-cyclodextrin, followed by the substitution of the tosyl group with an aminoethylamino group. The pK_a values for the conjugate acids of CD-3-en were determined to be 5.18 and 9.25, each of which is significantly smaller than the corresponding value for ethylenediamine (6.85 and 9.93 respectively).
The complexation of CD-3-en with a few metal ions was examined in a buffer solution at pH 10.5 and 25℃. It was revealed that copper(II), cobalt(II), and nickel(II) form 1:2, 1:2 and 1:4 complexes, respectively, with CD-3-en.
The complexation of CD-3-en with a few metal ions was examined in a buffer solution at pH 10.5 and 25℃. It was revealed that copper(II), cobalt(II), and nickel(II) form 1:2, 1:2 and 1:4 complexes, respectively, with CD-3-en.
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