pH control of the photophysical properties of ruthenium complexes containing 3-(pyrazin-2-yl)-1,2,4-triazole ligands
- Gorlaeus Laboratoria, Leiden (Netherlands)
- Univ. of Amsterdam (Netherlands)
- Dublin City Univ. (Ireland)
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.
- OSTI ID:
- 5793066
- Journal Information:
- Inorganic Chemistry; (USA), Journal Name: Inorganic Chemistry; (USA) Vol. 30:1; ISSN 0020-1669; ISSN INOCA
- Country of Publication:
- United States
- Language:
- English
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140505* -- Solar Energy Conversion-- Photochemical
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400 -- Electrochemistry
400500 -- Photochemistry
AZINES
AZOLES
BARYONS
BIPYRIDINES
CATALYSIS
CHEMICAL PREPARATION
CHEMISTRY
COMPLEXES
CONVERSION
DATA
ELECTROCHEMISTRY
ELEMENTARY PARTICLES
ENERGY CONVERSION
EXPERIMENTAL DATA
FERMIONS
HADRONS
HETEROCYCLIC COMPOUNDS
INFORMATION
NMR SPECTRA
NUCLEONS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANOMETALLIC COMPOUNDS
PHOTOCHEMISTRY
PROTONS
PYRAZINES
PYRIDINES
RAMAN SPECTRA
RUTHENIUM COMPLEXES
SOLAR ENERGY CONVERSION
SPECTRA
SYNTHESIS
TRANSITION ELEMENT COMPLEXES
TRIAZOLES
ULTRAVIOLET SPECTRA
VISIBLE SPECTRA