Q7(c). ESR spectra of three aromatic radicals
Give the ESR spectra of Naphthalene negative ion, Anthracene negative ion and Triphenyl methyl radical.
Answer in brief
Naphthalene•⁻: 25 lines (quintet of quintets, a 0.490 and 0.183 mT). Anthracene•⁻: 75 lines (triplet of quintets of quintets, a 0.534, 0.274, 0.151 mT experimental). Ph₃C•: 196 lines (o and p couplings larger than m).
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Covershyperfine splittingN + 1 linesbinomial intensitiesMcConnell equationortho and para larger
All parts of Question 7
- 7(a) C₆H₁₀O from UV, IR and ¹H NMR: mesityl oxide20 marks
- 7(b) ¹H NMR of p-xylene and ethylbenzene10 marks
- 7(c) ESR spectra of three aromatic radicals10 marks