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希土類-エチレンジアミン四酢酸(EDTA)の結晶状態における配位数

ミニ・レビュー

##article.authors##

DOI:

https://doi.org/10.51094/jxiv.395

キーワード:

アミノポリカルボン酸塩、 CCDC、 キレート、 錯イオン、 ランタノイド、 構造

抄録

希土類元素(REE)-エチレンジアミン四酢酸塩(EDTA)の結晶構造は,医工学への応用可能性を含んでおり,いくつかの研究者によって簡単に総説されている.しかし,REE-EDTA錯体のほとんど全てについて体系化されたものはない.そこで本研究では,ケンブリッジ結晶学データセンター(CCDC)において,Sc, Pm, Tmを除く109種類のREE-EDTAを検索し,それらの配位数(C.N.)を整理した.REE-EDTAの登録数が最も多いのはLa-EDTAで21種類,次いでCe-およびGd-EDTAがそれぞれ13種類だった.各錯体のC.N.は,軽希土類(La-Sm)が10~9、重希土類(YおよびEu-Lu)が9~8であり、ランタノイド(Ln)-EDTAのC.N.が減少したのはランタノイド収縮によるものと考えられる.Tb-EDTAのC.N.がLn-EDTA錯体全体のC.N.の減少からは少しずれており,登録されたサンプルの数が十分でなかったためであると考えられる.

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引用文献

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