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Topic: Anthracene fluorescence ability  (Read 1501 times)

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Offline Rutherford

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Anthracene fluorescence ability
« on: September 29, 2013, 07:14:56 AM »
Anthracene exhibits strong fluorescence with emission wavelength centered at 325 nm. Combining the binding selectivity of azacrowns for alkali metal ions and the highly fluorescent anthracene, a metal ion selective fluorescent sensor E has been developed. For comparison studies, the anthracene derivatives F and G shown below were also synthesized. These compounds E, F, and G are almost non-fluorescent in neutral conditions due to the strong photoinduced electron transfer (PET) quenching process arising by donating nitrogen lone-pair electron to the anthracene excited-state.

1) Upon adding aqueous HCl, which compound will exhibit strong fluorescence?

2) By adding one equivalent of potassium acetate into a dilute solution (1ยท10-5 M) of E, F, and G in methanol, respectively, which compound will show the strongest fluorescence?

3) Upon adding one equivalent of metal acetate to a dilute solution of F, which alkali metal acetate will cause the strongest fluorescence?

What is the reasoning here? I need serious help here. I only know that 1) all should exhibit strong fluorescence because the lone pair of nitrogen is converted to a bond pair of N-H bond.

Offline Rutherford

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Re: Anthracene fluorescence ability
« Reply #1 on: September 30, 2013, 10:20:34 AM »
The solutions are:
2) E;
3) sodium acetate.

Could someone rationalize this?

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