Solvent viscosity and interrelated effects on electrochemiluminescence intensity of tris(2,2′-bipyridyl)ruthenium(II)

Amy M. Scott, Radha Pyati

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


We report the electrochemiluminescence (ECL) intensity of tris(2,2′-bipyridyl)ruthenium(II) [Ru(bpy)32+] as a function of varying solution viscosity in mixtures of N,N-dimethylformamide and glycerin. Diffusion coefficient (D), electron-transfer rate (k) of Ru(bpy)32+/3+, and luminescence intensity are measured and correlated with viscosity and ECL intensity (Iecl). Iecl decreases with increasing solution viscosity and tracks diffusion and electron transfer until it reaches an upper limit. This limit is reached at D = 5 × 10-7 cm2/s and k = 0.03 cm/s in this system. Normalizing Iecl for diffusion reveals a weak enhancement of ECL with increasing viscosity.

Original languageEnglish (US)
Pages (from-to)9011-9015
Number of pages5
JournalJournal of Physical Chemistry B
Issue number37
StatePublished - Sep 20 2001
Externally publishedYes

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry


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