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• W2063272502 abstract "The use of proton nuclear magnetic resonance, 1 H NMR, is fully described and demonstrate as a powerful tool to follow a reaction and to determine accurate quantum yields for photochemical processes when the ordinary spectral absorption variation is precluded due to the reactant and photoproduct absorption overlap. In this work, the use of proton nuclear magnetic resonance, 1 H NMR, was fully described as a powerful tool to follow a photoreaction and to determine accurate quantum yields, so called true quantum yields ( Φ true ), when a reactant and photoproduct absorption overlap. For this, Φ true for the trans – cis photoisomerization process were determined for rhenium(I) polypyridyl complexes, fac -[Re(CO) 3 (NN)( trans -L)] + (NN = 1,10-phenanthroline, phen, or 4,7-diphenyl-1,10-phenanthroline, ph 2 phen, and L = 1,2-bis(4-pyridyl)ethylene, bpe, or 4-styrylpyridine, stpy). The true values determined at 365 nm irradiation (e.g. Φ NMR = 0.80 for fac -[Re(CO) 3 (phen)( trans -bpe)] + ) were much higher than those determined by absorption spectral changes ( Φ UV–Vis = 0.39 for fac -[Re(CO) 3 (phen)( trans -bpe)] + ). Φ NMR are more accurate in these cases due to the distinct proton signals of trans and cis -isomers, which allow the actual determination of each component concentration under given irradiation time. Nevertheless when the photoproduct or reactant contribution at the probe wavelength is negligible, one can determine Φ true by regular absorption spectral changes. For instance, Φ 313 nm for free ligand photoisomerization determined both by absorption and 1 H NMR variation are equal within the experimental error (bpe: Φ UV–Vis = 0.27, Φ NMR = 0.26; stpy: Φ UV–Vis = 0.49, Φ NMR = 0.49). Moreover, 1 H NMR data combined with electronic spectra allowed molar absorptivity determination of difficult to isolate cis -complexes." @default.
• W2063272502 created "2016-06-24" @default.
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• W2063272502 date "2010-01-01" @default.
• W2063272502 modified "2023-09-30" @default.
• W2063272502 title "1H NMR spectroscopy as a tool to determine accurate photoisomerization quantum yields of stilbene-like ligands coordinated to rhenium(I) polypyridyl complexes" @default.
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• W2063272502 doi "https://doi.org/10.1016/j.ica.2009.10.008" @default.
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