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Lanthanide chemistry with bis[bis(carboxymethyl)amino]methylphosphinate: What does an extra phosphinate group do to EDTA?

TitleLanthanide chemistry with bis[bis(carboxymethyl)amino]methylphosphinate: What does an extra phosphinate group do to EDTA?
Publication TypeJournal Article
Year of Publication2001
AuthorsXu, L, Rettig, SJ, Orvig, C
JournalInorganic Chemistry
Volume40
Pagination3734-3738
Date PublishedJul
Type of ArticleArticle
ISBN Number0020-1669
KeywordsACID, AGENTS, AMINE PHENOL LIGANDS, ANTIBODY, COMPLEXES, CRYSTAL-STRUCTURES, DERIVATIVES, IONS
Abstract

H5XT (bis{[bis(carboxymethyl)amino]methyl}phosphinic acid) is an EDTA(4-)-like ligand containing an extra phosphinate group. [Co-II(XT)](3-), [Co-III(XT)](2-), and a series of [Ln(XT)](2-) complexes have been prepared. The phosphinate group is not coordinated in the Co complexes but is bound in the lanthanide complexes. Solid state and solution behaviors of Ln-XT species are consistent: both monoprotonated and nonprotonated species have been found. Protonation of the metal complex does not lead to dissociation of a carboxylate; rather, the proton distributes around the molecular ion. The pM values of Ln-XT are comparable to those of Ln-EDTA but are higher than those of Ln-TMDTA. The inclusion of a phosphinate eases the selectivity of an EDTA-type ligand for late lanthanides.

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