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

doi:10.1039/B007962F

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 journal › Article › peer-review

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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 language	English
Pages (from-to)	458-464
Number of pages	7
Journal	New Journal of Chemistry
Volume	25
Issue number	3
DOIs	https://doi.org/10.1039/B007962F
Publication status	Published - 15 Feb 2001

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@article{3e448a7ed3f341df942d8e488ced40cb,

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

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+.",

author = "Benniston, {Andrew C.} and Mackie, {Philip R.} and Farrugia, {Louis J.} and Graeme Smith and Teat, {Simon J.} and McLean, {Andrew J.}",

year = "2001",

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doi = "10.1039/B007962F",

language = "English",

volume = "25",

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journal = "New Journal of Chemistry",

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TY - JOUR

T1 - Detailed photophysical properties of a functionalized ruthenium (II) polypyridyl complex

T2 - through-space solvent effects

AU - Benniston, Andrew C.

AU - Mackie, Philip R.

AU - Farrugia, Louis J.

AU - Smith, Graeme

AU - Teat, Simon J.

AU - McLean, Andrew J.

PY - 2001/2/15

Y1 - 2001/2/15

N2 - 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+.

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+.

U2 - 10.1039/B007962F

DO - 10.1039/B007962F

M3 - Article

SN - 1144-0546

VL - 25

SP - 458

EP - 464

JO - New Journal of Chemistry

JF - New Journal of Chemistry

IS - 3

ER -

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

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