2.4 Signal Intensity

2.4 Signal Intensity

• Some bonds absorb IR radiation more efficiently than others.
• The efficiency of a bond depends on the magnitude of the dipole moment.

• The bonds have a measurable dipole moment, but they differ in size.
• The carbonyl group is analyzed first.
• The carbon atom has a partial positive charge and the oxygen atom has a partial negative charge.
• The carbonyl group has a large moment.
• Let's look at the C bond.
• One vinylic position is connected to hydrogen atoms, while the other is connected to alkyl groups.
• The vinylic position with two alkyl groups is slightly more electron-rich than the other vinylic position.