Detailed photophysical properties of a functionalized ruthenium (II) polypyridyl complex: through-space solvent effects

Andrew C. Benniston*, Philip R. Mackie, Louis J. Farrugia, Graeme Smith, Simon J. Teat, Andrew J. McLean

*Corresponding author for this work

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The synthesis and detailed photophysical properties of a bis(N-methylene-4-pyridinium-4′-pyridine)-functionalized ruthenium(II) polypyridyl complex in solvents of varying polarity and Gutmann's donor number (DN) are reported, along with its single-crystal X-ray structure. The emission spectrum of the complex in varying solvents was also simulated and parameters, including the Huang–Rhys (Sm) electron-vibrational coupling constant, obtained. Reasonable correlations of the optical properties with the solvent polarity factor (Δf) and DN were observed. A difference in dipole moment between the ground and excited states of ca. 10 D was calculated, and a simplified potential-energy surface model proposed to explain the results. Excited state lifetimes in acetonitrile were determined over a modest temperature range of 60 K. The linear Arrhenius plot of ln(kobs) [italic v (to differentiate from Times ital nu)]s. 1/T gave an activation energy of 5.6(±0.6) kJ mol−1, which is low when compared to the literature value of 45.5 kJ mol−1 for [Ru(bipy)3]2+.
Original languageEnglish
Pages (from-to)458-464
Number of pages7
JournalNew Journal of Chemistry
Volume25
Issue number3
DOIs
Publication statusPublished - 15 Feb 2001

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Ruthenium
Excited states
Arrhenius plots
Potential energy surfaces
Dipole moment
Acetonitrile
Pyridine
Ground state
Optical properties
Activation energy
Single crystals
X rays
Electrons
Temperature

Cite this

Benniston, Andrew C. ; Mackie, Philip R. ; Farrugia, Louis J. ; Smith, Graeme ; Teat, Simon J. ; McLean, Andrew J. / Detailed photophysical properties of a functionalized ruthenium (II) polypyridyl complex : through-space solvent effects. In: New Journal of Chemistry. 2001 ; Vol. 25, No. 3. pp. 458-464.
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Detailed photophysical properties of a functionalized ruthenium (II) polypyridyl complex : through-space solvent effects. / Benniston, Andrew C.; Mackie, Philip R.; Farrugia, Louis J.; Smith, Graeme; Teat, Simon J.; McLean, Andrew J.

In: New Journal of Chemistry, Vol. 25, No. 3, 15.02.2001, p. 458-464.

Research output: Contribution to journalArticle

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AU - Benniston, Andrew C.

AU - Mackie, Philip R.

AU - Farrugia, Louis J.

AU - Smith, Graeme

AU - Teat, Simon J.

AU - McLean, Andrew J.

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AB - The synthesis and detailed photophysical properties of a bis(N-methylene-4-pyridinium-4′-pyridine)-functionalized ruthenium(II) polypyridyl complex in solvents of varying polarity and Gutmann's donor number (DN) are reported, along with its single-crystal X-ray structure. The emission spectrum of the complex in varying solvents was also simulated and parameters, including the Huang–Rhys (Sm) electron-vibrational coupling constant, obtained. Reasonable correlations of the optical properties with the solvent polarity factor (Δf) and DN were observed. A difference in dipole moment between the ground and excited states of ca. 10 D was calculated, and a simplified potential-energy surface model proposed to explain the results. Excited state lifetimes in acetonitrile were determined over a modest temperature range of 60 K. The linear Arrhenius plot of ln(kobs) [italic v (to differentiate from Times ital nu)]s. 1/T gave an activation energy of 5.6(±0.6) kJ mol−1, which is low when compared to the literature value of 45.5 kJ mol−1 for [Ru(bipy)3]2+.

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