Question
Strangely, although the solid form of this compound is yellow, its solution in water is purple. For 10 points each:
[10h] Name this stable radical that is used as a standard in EPR spectroscopy, in which it produces three equally strong spectral lines. Unusually for a stable radical, its radical anion is not organic or a transition metal complex.
ANSWER: Frémy’s salt [accept but DO NOT REVEAL potassium nitrosodisulfonate or disodium nitrosodisulfonate]
[10m] The radical in Frémy’s salt is by a bond between these two elements, which is essential for the stable organic radicals ABNO and TEMPO. One of the simplest stable radicals is a diatomic molecule with these two elements.
ANSWER: nitrogen and oxygen [or N and O; accept in either order; prompt on aminoxyl, nitroxyl, or nitroxide; prompt on nitric oxide]
[10e] Persistent radicals are often used for this type of reaction, which radicals cause other molecules to undergo by taking an electron from the other molecule to pair with its own unpaired electron, thus causing the other molecule to lose an electron.
ANSWER: oxidation [prompt on redox]
<Gerhardt Hinkle, Chemistry>
Summary
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