(b) What type of absorption requires the lowest energy
light?
3 (8.01 KiB) Viewed 32 times
(c) What type of absorption would have
a λmax with the shortest
wavelength?
4 (7.81 KiB) Viewed 32 times
(d) Why is the n ⟶
π∗ absorption not possible for
methanethiol?
5 (21.8 KiB) Viewed 32 times
(e) Why is
the n ⟶ π∗ absorption not
possible for ethene?
6 (19 KiB) Viewed 32 times
Based on the information in the table below... Molecule o + 0* TT +7* n + ơ* m + TT 165 nm ethene 135 nm - not possible not possible H2C=CH2 possible but very these absorptions tend to be obscured high E by typical solvents 188 nm acetone possible but very these absorptions possible 273 nm high E tend to be obscured H3C CH by typical solvents methanol possible but very not possible high E 183 nm not possible CH3OH methylamine possible but very not possible CH3NH2 high E 213 nm not possible methanethiol possible but very not possible CH3SH high E 235 nm not possible
promotion of an non-bonding electron to a sigma* (antibonding) orbital promotion of an electron from a pi orbital to a pi* (antibonding) orbital promotion of an non-bonding electron to a pi* (antibonding) orbital Promotion of an electron from a sigma orbital to a sigma * (antibonding) orbital *
n → TT* no* O → o* TT → TT*
n → TT* 00* TT → TT* no*
methanethiol does not have non-bonding electrons methanethiol is unstable to UV light methanethiol does not have any pi bonds methanethiol is a typical solvent
ethene does not have any pi bonds ethene is not stable to UV light ethene does not have non-bonding electrons ethene is a typical solvent
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