Six-membered ring chelate complexes of Ru(II)

Structural and photophysical effects

Maria Abrahamsson, Hans Christian Becker, Leif Hammarström, Celine Bonnefous, Charles Chamchoumis, Randolph P. Thummel

Research output: Contribution to journalArticle

49 Citations (Scopus)

Abstract

The structural and photophysical properties of Ru(II)-polypyridyl complexes with five- and six-membered chelate rings were studied for two bis-tridentate and two tris-bidentate complexes. The photophysical effect of introducing a six-membered chelate ring is most pronounced for the tridentate complex, leading to a room-temperature excited-state lifetime of 810 ns, a substantial increase from 180 ns for the five-membered chelate ring model complex. Contrasting this, the effect is the opposite in tris-bidentate complexes, in which the lifetime decreases from 430 ns to around 1 ns in going from a five-membered to six-membered chelate ring. All of the complexes were studied spectroscopically at both 80 K and ambient temperatures, and the temperature dependence of the excited-state lifetime was investigated for both of the bis-tridentate complexes. The main reason for the long excited-state lifetime in the six-membered chelate ring bis-tridentate complex was found to be a strong retardation of the activated decay via metal-centered states, largely due to an increased ligand field splitting due to the complex having a more-octahedral geometry.

Original languageEnglish
Pages (from-to)10354-10364
Number of pages11
JournalInorganic Chemistry
Volume46
Issue number24
DOIs
Publication statusPublished - Nov 26 2007

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chelates
Excited states
rings
life (durability)
Temperature
excitation
Metals
Ligands
Geometry
ambient temperature
temperature dependence
ligands
decay
room temperature
geometry
metals
temperature

ASJC Scopus subject areas

  • Inorganic Chemistry

Cite this

Abrahamsson, M., Becker, H. C., Hammarström, L., Bonnefous, C., Chamchoumis, C., & Thummel, R. P. (2007). Six-membered ring chelate complexes of Ru(II): Structural and photophysical effects. Inorganic Chemistry, 46(24), 10354-10364. https://doi.org/10.1021/ic7011827

Six-membered ring chelate complexes of Ru(II) : Structural and photophysical effects. / Abrahamsson, Maria; Becker, Hans Christian; Hammarström, Leif; Bonnefous, Celine; Chamchoumis, Charles; Thummel, Randolph P.

In: Inorganic Chemistry, Vol. 46, No. 24, 26.11.2007, p. 10354-10364.

Research output: Contribution to journalArticle

Abrahamsson, M, Becker, HC, Hammarström, L, Bonnefous, C, Chamchoumis, C & Thummel, RP 2007, 'Six-membered ring chelate complexes of Ru(II): Structural and photophysical effects', Inorganic Chemistry, vol. 46, no. 24, pp. 10354-10364. https://doi.org/10.1021/ic7011827
Abrahamsson M, Becker HC, Hammarström L, Bonnefous C, Chamchoumis C, Thummel RP. Six-membered ring chelate complexes of Ru(II): Structural and photophysical effects. Inorganic Chemistry. 2007 Nov 26;46(24):10354-10364. https://doi.org/10.1021/ic7011827
Abrahamsson, Maria ; Becker, Hans Christian ; Hammarström, Leif ; Bonnefous, Celine ; Chamchoumis, Charles ; Thummel, Randolph P. / Six-membered ring chelate complexes of Ru(II) : Structural and photophysical effects. In: Inorganic Chemistry. 2007 ; Vol. 46, No. 24. pp. 10354-10364.
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