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c c single bond
1200
c c isolated double bond
1640-1680
c c aromatic double bond
1600
c c triple bond
2200
c-h sp3
2800-3000
c-h sp2
3000-3100
c-h sp
3300
o-h
3300 strong and broad
n-h
3300, spikes for nh bonds
c-o double bond
1710 (ketones, aldehydes, carboxylic acid)
conjugated c-o double bond
less than 1700
esters
1735 and higher
c triple bond n
over 2200 when stretching
c-o single bond, ether
1100