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Luminescence and Energy Transfer in Solutions of Rare‐Earth Complexes. I. Enhancement of Fluorescence by Deuterium Substitution
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14.This was not the case for the data presented in our preliminary note where values of were about a factor of 2 less than corresponding values of We attribute this to the fact that in these early experiments, several days elapsed between the intensity measurements and the lifetime measurements. Subsequent studies have shown that deuterated samples are very sensitive to contamination by atmospheric moisture. With the large enhancement factors, only 5% of is enough to halve the lifetime of a solution. In the present work, freshly made solutions were used for all measurements.
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21.The above conclusions are bolstered by the observation that in solution, addition of acetate ions in the form of potassium acetate increases the lifetime, whereas in solutions excess acetate ions cause a decrease in lifetime (unpublished work in this laboratory).
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28.McClure has informed us recently that room‐temperature fluorescence for chrome alum crystals which had been crystallized from has been observed by Goldsmith and himself. The ordinary hydrated salt does not fluoresce at room temperature. This augurs well for the success of a search for emission for other ions.
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