Structure and photophysical properties of novel ruthenium(II) complexes containing 6-substituted bipyridines

Leif Hammarström, Jan Alsins, Anna Börje, Thomas Norrby, Lian Zhang, Björn Åkermark

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

A series of novel tris(bpy)ruthenium(II)-type complexes (where bpy = 2,2′-bipyridine) Ru(bpy)2(6-carboxylato-2,2′-bpy) hexafluorophosphate, Ru(bpy)2((2,2′-bpy-6-yl)-acetic acid) dihexafluorophosphate, Ru(bpy)2(6-methoxycarbonyl-2,2′-bpy) dihexafluorophosphate, and Ru(bpy)2(6-methyl-2,2′-bpy) dihexafluorophosphate were synthesised, and characterised by NMR spectroscopy, cyclic voltammetry, absorption and emission spectroscopy. The dominating effect of the substituent on the emission properties was an increased radiationless deactivation via metal-centered states, leading to a very short lifetime at 298 K. The degree of modification of the photophysical properties compared to those of Ru(bpy)2+3 followed the degree of geometric distortion introduced by the substituted ligand as suggested by NMR spectroscopy. In Ru(bpy)2(6-carboxylato-2,2′-bpy) hexafluorophosphate, an abnormal temperature dependence of the rate of radiative decay was observed. This may probably be explained by participation of metal-to-ligand charge transfer (MLCT) states originating from different, non-equivalent ligands.

Original languageEnglish
Pages (from-to)139-150
Number of pages12
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume102
Issue number2-3
DOIs
Publication statusPublished - Jan 22 1997

Keywords

  • Bipyridine
  • Photophysical properties
  • Ruthenium(II) complex
  • Structure

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Physics and Astronomy(all)

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