Kinetically stable Ln III complexes comprising a trinuclear core sandwiched between two thiacalix[4]arene ligands self-assembled in water (Ln III = Nd III, Yb III)

Nobuhiko Iki, Shouichi Hiro-Oka, Mami Nakamura, Teppei Tanaka, Hitoshi Hoshino

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

In aqueous solutions, thiacalixarene (TCAS) and Ln III (= Nd III, Yb III) self-assembled over a long period of time (1 d) to form 3:2 complexes Ln III 3·TCAS 2 in which the Ln III 3 core is sandwiched between two TCAS ligands, which results in a high kinetic stability. This was not expected from the exo-coordination fashion of TCAS with the O,S,O donors found in the 1:1 complex Ln III·TCAS, and thus this feature was attributed to the multiple bonds between the Ln III 3 core and TCAS. Our observations open an exciting possibility of designing kinetically stable Ln III complexes by using exo-type ligands as scaffolds to sandwich a multi-Ln III core rather than endo-type ones to encapsulate a Ln III core. Lanthanides(III) (Ln = Nd, Yb) and thiacalix[4]arene (TCAS) self-assembled in water to form Ln 3·TCAS 2, over a period of 1 d. The high kinetic stability of Ln 3·TCAS 2 revealed by HPLC was unexpected from the tridentate coordination fashion of TCAS in Ln·TCAS. This suggests a new way to design kinetically stable complexes through the formation of clusters.

Original languageEnglish
Pages (from-to)3541-3545
Number of pages5
JournalEuropean Journal of Inorganic Chemistry
Issue number22
DOIs
Publication statusPublished - 2012 Aug 1

Keywords

  • Calixarenes
  • Cluster compounds
  • Lanthanides
  • S ligands
  • Self-assembly

ASJC Scopus subject areas

  • Inorganic Chemistry

Fingerprint Dive into the research topics of 'Kinetically stable Ln <sup>III</sup> complexes comprising a trinuclear core sandwiched between two thiacalix[4]arene ligands self-assembled in water (Ln <sup>III</sup> = Nd <sup>III</sup>, Yb <sup>III</sup>)'. Together they form a unique fingerprint.

  • Cite this