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Updated: Aug 10, 2026

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纳米架构的形成,包括亚纳米集群和它们作为高活性催化剂的使用

Kuniaki Okamoto1, Ryo Akiyama, Hisao Yoshida

  • 1Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.

Journal of the American Chemical Society
|February 17, 2005
PubMed
概括

亚纳米 (Pd) 集群在共聚合物微粒中得到稳定. 这些含有Pd的微粒有效催化化和Heck反应.

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Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
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Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...