Binding of europium complex to polymerizable macrocyclic molecules and its optical properties

Rahmat Hidayat, Okihiro Sugihara, Masaaki Tsuchimori, Manabu Kagami, Tadatomi Nishikubo, Toshikuni Kaino

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Study on the incorporation of trivalent europium (Eu3+) complex into polymerizable macrocylic molecules, namely calixarene and calixresorcinarene derivatives, has been carried out. Broadening of hypersensitive luminescence peak was observed in solution and polymer containing a compound of europium complex and calixresorcinarene monomer, which is ascribed to ligand field splitting due to anisotropic local field at the Eu3+ ion site. From 1H NMR spectroscopy, it is found that the chemical shift originated from the moiety at the upper rim of calixresorcinarene is remarkably downfield shifted. Pseudocontact shift analysis suggests that binding between Eu3+ ion and calixresorcinarene monomer is formed at the Eu3+ second coordination sphere. These experimental results show that the binding does not alter nephelauxetic effect of the Eu3+ first coordination shell, but only slightly change coordination structure and symmetry. Nevertheless, the binding results in longer luminescence lifetime in comparison to the case of pure europium complex indicating significant reduction of non-radiative decay.

Original languageEnglish
Pages (from-to)1367-1374
Number of pages8
JournalOptical Materials
Volume29
Issue number11
DOIs
Publication statusPublished - 2007 Jul

Keywords

  • Calixarene
  • Calixresorcinarene
  • Chemical shift
  • Coordination structure
  • Europium complex
  • Ligand field
  • Luminescence
  • Macrocyclic molecule
  • Polymer

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Computer Science(all)
  • Atomic and Molecular Physics, and Optics
  • Spectroscopy
  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry
  • Electrical and Electronic Engineering

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