Chelating agent

Japanese: キレート試薬 - キレートしやく(英語表記)chelating agent
Chelating agent
A polydentate ligand is a compound that can become a polydentate ligand by coordinating with a metal ion to form a chelate compound. For example, carbonic acid gives up two hydrogen ions to become a carbonate ion, which then coordinates to the central atom M to form a carbonate complex with a four-membered chelate ring, so carbonic acid, carbonate ion, or carbonate salts are among the simplest chelating agents. A similar example is a dicarboxylic acid such as oxalic acid, which has two acidic groups and forms an oxalato complex with a five-membered chelate ring.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:
金属イオンに配位してキレート化合物をつくる多座配位子,あるいはそのような多座配位子となりうる化合物をいう。たとえば炭酸は二つの水素イオンを放って炭酸イオンとなり,中心原子Mに配位して4員キレート環をもつカルボナト錯体をつくるから,炭酸,炭酸イオンあるいは炭酸塩は最も簡単なキレート試薬の一つである。同様のものとして,5員キレート環をもつオキサラト錯体をつくる,酸性基二つをもつシュウ酸のようなジカルボン酸がある。

出典 株式会社平凡社世界大百科事典 第2版について 情報

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