10.1021/jp505619h.s001
Sergey
V. Litke
Sergey
V.
Litke
Aleksei Yu. Ershov
Aleksei Yu.
Ershov
Thomas J. Meyer
Thomas J.
Meyer
Photophysics of Bis-bipyridyl Nitro Complexes of Ruthenium(II)
with Pyridine Ligands: Substituent Effects
American Chemical Society
2014
E 00
ligand
decay rate constants
bi
ci
emission
complex
pyridine
knr
2014-08-14 00:00:00
Journal contribution
https://acs.figshare.com/articles/journal_contribution/Photophysics_of_Bis_bipyridyl_Nitro_Complexes_of_Ruthenium_II_with_Pyridine_Ligands_Substituent_Effects/2264842
Emission, excitation spectra, quantum
yields, and emission lifetimes
are reported for the mixed ligand, bis-(2,2′-bipyridine)ruthenium(II)
complexes <i>cis-</i>[Ru(bpy)<sub>2</sub>(L)(NO<sub>2</sub>)]<sup>+</sup> with 4-substituted pyridines as ligands L [isonicotinamide
(isnc), 4,4′-bipyridine (bipy), pyridine (py), 4-phenylpyridine
(phpy), 1,2-bis(4-pyridyl)ethane (bpa), 4-picoline (mepy), 4-aminopyridine
(apy), and 4-dimethylaminopyridine (ampy)] in EtOH–MeOH, 4:1
(V:V), at 77 K. Radiative, <i>k</i><sub>r</sub>, and nonradiative, <i>k</i><sub>nr</sub>, decay rate constants were determined for
the series of complexes, and a linear dependence of ln <i>k</i><sub>nr</sub> on <i>E</i><sub>00</sub>, with <i>E</i><sub>00</sub> as the 0–0 energy gap determined by emission
spectral fitting, was obtained with a slope of −(3.35 ±
0.23) × 10<sup>–4</sup> cm<sup>–1</sup>. A linear
correlation of <i>E</i><sub>00</sub> for <i>cis</i>-[Ru(bpy)<sub>2</sub>(L)(NO<sub>2</sub>)]<sup>+</sup> complexes and
Hammett substituent constant σ<sub>p</sub> is found.