Room temperature phosphorescence characteristics of platinum(II) chelates with 8-quinolinol derivatives in aqueous micellar solutions

Hitoshi Hoshino, Masahiro Suzuki, Masaki Kan'No, Takao Ohmachi, Takao Yotsuyanagi

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Phosphorescence from platinum(II) chelates of 8-quinolinol (8-Q), 5-sulfo-8-quinolinol (SQ), and 5-sulfo-7-iodo-8-quinolinol (SIQ) at ca. 630nm is strongly enhanced in certain kinds of surfactant micellar solutions in the presence of sulfite ion as a chemical de-oxygenator. Among these ligand systems the [Pt(II)(SIQ)2]2- chelate is most highly phosphorescent with a quantum yield of 0.028 in n-dodecyl-β-D-maltoside (DOM) micelles at 298K because of the heavy-atom effect of iodine. The emission due to the dianionic 1:2 chelates of SQ and SIQ are strongly facilitated either in cationic and non-ionic surfactant micelles such as hexadecyltrimethylammonium chloride (CTAC) or bromide (CTAB), Brij-35, Triton X-100, and DOM in sharp contrast to the slight sensitization by sodium dodecylsulfate (SDS) micelles of similar charge. Anionic SDS micelles do not work well even for the uncharged [Pt(II)(8-Q)2] chelate. The emission decay lifetimes of the chelates in de-oxygenated micellar solutions are in a similar range of 28μs with CTAB to 37μs with DOM, at 298K. In a pre-micellar region of CTAC, below the critical micelle concentration, the chelate is also luminescent as the ion-pair of (CTA)2[Pt(II)(SIQ)2]. The highly sensitive phosphorescence detection of Pt(II) ion is achievable using the SIQ-DOM-sulfite system, giving a 3σ detection limit of 30nM or 6ng Ptml-1 Copyright (C) 2000 Elsevier Science B.V.

Original languageEnglish
Pages (from-to)71-79
Number of pages9
JournalAnalytica Chimica Acta
Volume407
Issue number1-2
DOIs
Publication statusPublished - 2000 Feb 29

Keywords

  • Aqueous micellar solutions
  • Chemical de-oxygenator
  • Phosphorescence

ASJC Scopus subject areas

  • Analytical Chemistry
  • Environmental Chemistry
  • Biochemistry
  • Spectroscopy

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