skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: pH control of the photophysical properties of ruthenium complexes containing 3-(pyrazin-2-yl)-1,2,4-triazole ligands

Abstract

A new series of (Ru(bpy){sub 2}(L))(PF{sub 6}){sub 2} complexes, where bpy = 2,2{prime}-bipyridine and L = 3-(pyrazin-2-yl)-1,2,4-triazole (HLO), 1-methyl-3-(pyrazin-2-yl)-1,2,4-triazole (L1), 1-methyl-5-(pyrazin-2-yl)-1,2,4-triazole (L2), and 3-methyl-5-(pyrazin-2-yl)-1,2,4-triazole (HO3), have been prepared and characterized. {sup 1}H NMR spectroscopy has been used to analyze the coordination modes of the ligands, while UV-vis absorption, emission, and resonance Raman spectroscopies, together with electrochemistry, have been used to study the properties of the complexes in their ground and excited states. Electrochemical data and resonance Raman experiments show that in the compounds containing protonated or N-methyl-substituted pyrazinyltriazole ligands the lowest {pi}* levels are pyrazinyltriazole based, while for the complexes with deprotonated ligands the lowest {pi}* levels are located on the bpy ligands. Furthermore, the emission data (lifetimes and maxima) suggest that the emitting states can be changed from bpy to pyrazinyltriazole based upon lowering the pH for (Ru(bpy){sub 2}(L0)){sup +} and (Ru(bpy){sub 2}(L3)){sup +}. Another interesting feature is that the absorption and emission maxima of (Ru(bpy){sub 2}(L0)){sup +} and (Ru(bpy){sub 2}(L3)){sup +}. Another interesting feature is that the absorption and emission maxima of (Ru(bpy){sub 2}(L0)){sup +} and (Ru(bpy){sub 2}(L3)){sup +} do not change to a large extent when the pH is lowered. 39 refs., 8 figs., 4 tabs.

Authors:
; ; ;  [1]; ;  [2];  [3]
  1. Gorlaeus Laboratoria, Leiden (Netherlands)
  2. Univ. of Amsterdam (Netherlands)
  3. Dublin City Univ. (Ireland)
Publication Date:
OSTI Identifier:
5793066
Resource Type:
Journal Article
Journal Name:
Inorganic Chemistry; (USA)
Additional Journal Information:
Journal Volume: 30:1; Journal ID: ISSN 0020-1669
Country of Publication:
United States
Language:
English
Subject:
14 SOLAR ENERGY; 37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; BIPYRIDINES; CHEMICAL PREPARATION; ORGANOMETALLIC COMPOUNDS; PYRAZINES; RUTHENIUM COMPLEXES; SOLAR ENERGY CONVERSION; CATALYSIS; TRIAZOLES; ELECTROCHEMISTRY; EXPERIMENTAL DATA; NMR SPECTRA; PHOTOCHEMISTRY; PROTONS; RAMAN SPECTRA; ULTRAVIOLET SPECTRA; VISIBLE SPECTRA; AZINES; AZOLES; BARYONS; CHEMISTRY; COMPLEXES; CONVERSION; DATA; ELEMENTARY PARTICLES; ENERGY CONVERSION; FERMIONS; HADRONS; HETEROCYCLIC COMPOUNDS; INFORMATION; NUCLEONS; NUMERICAL DATA; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; PYRIDINES; SPECTRA; SYNTHESIS; TRANSITION ELEMENT COMPLEXES; 140505* - Solar Energy Conversion- Photochemical, Photobiological, & Thermochemical Conversion- (1980-); 400500 - Photochemistry; 400400 - Electrochemistry

Citation Formats

Nieuwenhius, H A, Haasnoot, J G, Hage, R, Reedijk, J, Snoeck, T L, Stufkens, D J, and Vos, J G. pH control of the photophysical properties of ruthenium complexes containing 3-(pyrazin-2-yl)-1,2,4-triazole ligands. United States: N. p., 1991. Web. doi:10.1021/ic00001a010.
Nieuwenhius, H A, Haasnoot, J G, Hage, R, Reedijk, J, Snoeck, T L, Stufkens, D J, & Vos, J G. pH control of the photophysical properties of ruthenium complexes containing 3-(pyrazin-2-yl)-1,2,4-triazole ligands. United States. https://doi.org/10.1021/ic00001a010
Nieuwenhius, H A, Haasnoot, J G, Hage, R, Reedijk, J, Snoeck, T L, Stufkens, D J, and Vos, J G. 1991. "pH control of the photophysical properties of ruthenium complexes containing 3-(pyrazin-2-yl)-1,2,4-triazole ligands". United States. https://doi.org/10.1021/ic00001a010.
@article{osti_5793066,
title = {pH control of the photophysical properties of ruthenium complexes containing 3-(pyrazin-2-yl)-1,2,4-triazole ligands},
author = {Nieuwenhius, H A and Haasnoot, J G and Hage, R and Reedijk, J and Snoeck, T L and Stufkens, D J and Vos, J G},
abstractNote = {A new series of (Ru(bpy){sub 2}(L))(PF{sub 6}){sub 2} complexes, where bpy = 2,2{prime}-bipyridine and L = 3-(pyrazin-2-yl)-1,2,4-triazole (HLO), 1-methyl-3-(pyrazin-2-yl)-1,2,4-triazole (L1), 1-methyl-5-(pyrazin-2-yl)-1,2,4-triazole (L2), and 3-methyl-5-(pyrazin-2-yl)-1,2,4-triazole (HO3), have been prepared and characterized. {sup 1}H NMR spectroscopy has been used to analyze the coordination modes of the ligands, while UV-vis absorption, emission, and resonance Raman spectroscopies, together with electrochemistry, have been used to study the properties of the complexes in their ground and excited states. Electrochemical data and resonance Raman experiments show that in the compounds containing protonated or N-methyl-substituted pyrazinyltriazole ligands the lowest {pi}* levels are pyrazinyltriazole based, while for the complexes with deprotonated ligands the lowest {pi}* levels are located on the bpy ligands. Furthermore, the emission data (lifetimes and maxima) suggest that the emitting states can be changed from bpy to pyrazinyltriazole based upon lowering the pH for (Ru(bpy){sub 2}(L0)){sup +} and (Ru(bpy){sub 2}(L3)){sup +}. Another interesting feature is that the absorption and emission maxima of (Ru(bpy){sub 2}(L0)){sup +} and (Ru(bpy){sub 2}(L3)){sup +}. Another interesting feature is that the absorption and emission maxima of (Ru(bpy){sub 2}(L0)){sup +} and (Ru(bpy){sub 2}(L3)){sup +} do not change to a large extent when the pH is lowered. 39 refs., 8 figs., 4 tabs.},
doi = {10.1021/ic00001a010},
url = {https://www.osti.gov/biblio/5793066}, journal = {Inorganic Chemistry; (USA)},
issn = {0020-1669},
number = ,
volume = 30:1,
place = {United States},
year = {Tue Jan 01 00:00:00 EST 1991},
month = {Tue Jan 01 00:00:00 EST 1991}
}