Kazan Federal University Digital Repository

Use of the macrocyclic ligand cucurbit[6]uril for isolation of tetranuclear lanthanide aquahydroxo-carboxylate complexes from aqueous solutions

Show simple item record

dc.contributor.author Mainicheva E.
dc.contributor.author Gerasko O.
dc.contributor.author Sheludyakova L.
dc.contributor.author Naumov D.
dc.contributor.author Karsanova I.
dc.contributor.author Amirov R.
dc.contributor.author Fedin V.
dc.date.accessioned 2018-09-18T20:17:26Z
dc.date.available 2018-09-18T20:17:26Z
dc.date.issued 2006
dc.identifier.issn 1066-5285
dc.identifier.uri https://dspace.kpfu.ru/xmlui/handle/net/138357
dc.description.abstract The tetranuclear lanthanide complexes {[Ln4(μ3-OH) 4(μ2-OH)2(C5NH 4COO)2 (H2O)4-(C36H 36N24O12)2][Ln(H2O) 8]1.5[Ln(H2O)6(NO3) 2]0.5} (NO3)9•nH2O (Ln = Ho, Gd, or Er) were prepared by heating (130 °C) aqueous solutions of lanthanide nitrates, cucurbit[6]uril (C36H36N 24O12), and 4-cyanopyridine. The tetradentate coordination of the macrocyclic cucurbit[6]uril ligands through the portals leads to the formation of sandwich compounds, in which the tetranuclear hydroxo complex is located between two macrocyclic molecules. The polynuclear complexes are additionally stabilized by the chelating effect of the isonicotinate ligands generated by hydrolysis of 4-cyanopyridine. In the complexes, the aromatic moiety of the isonicotinate ion is encapsulated into the hydrophobic inner cavity of cucurbit[6]uril. In the absence of cucurbit[6]uril, the reaction with 4-cyanopyridine produces only the polymeric complexes [Nd(C5NH 4COO)3(H2O)2] and [Ln(C 5NH4COO)2(H2O)4]NO 3 (Ln = Pr, Sm, or Gd), whose structures were established by X-ray diffraction. In water and aqueous solutions of nonionic and cationic surfactants, irreversible changes of the tetranuclear fragment of the complex (Ln = Gd) were observed after storage for two days, whereas the anionic surfactant stabilizes the complexes. © 2006 Springer Science+Business Media, Inc.
dc.relation.ispartofseries Russian Chemical Bulletin
dc.subject Aqua complexes
dc.subject Crystal structure
dc.subject Cucurbit[6]uril
dc.subject Lanthanides
dc.title Use of the macrocyclic ligand cucurbit[6]uril for isolation of tetranuclear lanthanide aquahydroxo-carboxylate complexes from aqueous solutions
dc.type Article
dc.relation.ispartofseries-issue 11
dc.relation.ispartofseries-volume 55
dc.collection Публикации сотрудников КФУ
dc.relation.startpage 1956
dc.source.id SCOPUS10665285-2006-55-11-SID34247106350


Files in this item

This item appears in the following Collection(s)

  • Публикации сотрудников КФУ Scopus [24551]
    Коллекция содержит публикации сотрудников Казанского федерального (до 2010 года Казанского государственного) университета, проиндексированные в БД Scopus, начиная с 1970г.

Show simple item record

Search DSpace


Advanced Search

Browse

My Account

Statistics