Fluorescence behaviors of 3,3-bis(8-quinolyloxymethyl)oxetane: Effects of solvents, carrier-concentration, and metal ions on the fluorescence intensity.

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The effects of solvents, the concentration of 3,3-bis(8-quinolyloxymethyl)oxetane (1), and the presence of metal ions on the fluorescence intensity of 1 have been investigated. The fluorescence intensity of 1 considerably increased when measured in chloroform, acetonitrile, or dioxane, though resulting in a comparably small increase when measured in ethyl acetate, toluene, or ethylene glycol. When acetone was used as the solvent, the fluorescence spectrum was hardly observed. When the concentration of 1 was adjusted to near 0.1 mmol dm−3, the intensity became maximum in each solvent used, except for acetone. It was observed that the fluorescence intensity of 1 rapidly decreased in a concentration range over 0.1 mmol dm−3. Furthermore, when metal ions were added into an organic solution such as acetonitrile, dioxane, or chloroform containing 1, the maximum increase in the fluorescence intensity was observed in the presence of lithium salt, whereas the intensity hardly changed in the presence of both potassium and sodium ions, compared with that of 1 in the absence of any metal ion. The presence of magnesium and barium ions also hardly brought about an increase of the intensity. On the other hand, heavy metal ions, such as silver(I) and copper(II), were observed to results in a slight decrease.
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