O-H 3600 N-H 3400 C-H 3000 C=N 2250 C=C 2150 C=O 1715 C=C 1650 C-O 1100. =. =. EFFECTS OF CONJUGATION AND RING SIZE ON C=O. ALKENES AND AROMATICS. ( C=C STRETCHING). SURVEY OF SPECTRA. CONJUGATION. Conjugation of C=O with C=C.
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EFFECTS OF CONJUGATION
AND RING SIZE ON C=O
ALKENES AND AROMATICS
( C=C STRETCHING)
SURVEY OF SPECTRA
AND ALSO OF C=C (WHICH IS STRENGTHENED)
1650 1625 cm-1
C=C is also
In response to more p character
in the ring bonds, there is more s
character in the bonds to C=O.
More s character
leads to a shorter and
stronger bond and a
A smaller angle requires
more p character in the
hybrids forming the ring.
Typical Infrared AbsorptionRegions
stronger and comes at a lower frequency.