FTIR values

monosub Ar ring

690,750 strong

o-disub Ar ring

735 strong

m-disub Ar ring

690,780 strong

p-disub Ar ring

820 strong

C=O ketone

1680-1715 strong and prominent

O-H (carboxylic acid)

2500-3500 very broad and prominent

“Melting Mountain” → big melty blob from acid OH

C=O carboxylic acid

1650-1720 strong and prominent

C-O carboxylic acid

1150-1300 strong and broadened

N-H amine

3100-3500 moderate and broad

HNH amine

1500-1600 moderate and broad

C-N amine

1000-1300 moderate but hard to identify

N-O nitro

1350,1530 "fangs" both prominent

C=O amides

1640-1670 strong and prominent

C-N amide

1000-1300 moderate strength and hard to identify

C=O esters

1690-1740 strong and prominent

C-O esters

1100-1150 and 1150-1300 two bands, strong and broad

O-H (alcohol)

3200-3600 strong and broad

“Smooth Slide” → clean curve vs acid blob

C-O alcohol

1000-1300 strong and broad

C-H alcohol

2850-2960 weak to moderate

C=C

1640 weak to moderate

Nitrile (C triple bond N)

2250 prominent (strong)

“Desert Cactus in the 2200s” → lonely strong peak

isopropyl

1370-1390 (equal)

tertbutyl

1370-1390 unequal

C-C-C-C

720 weak, present only for longer chains

H-C-H

1365-1390 weak to moderate

H-C=-C (terminal)

3300 moderate and sharp

C=-C alkyne

2080-2280 weak, characteristic

“Desert Mirage” → weak signal in the empty 2100–2300 desert

C-O ethers

1000-1300

* ether bunny comes every 1000-1300 years

=C-H terminal alkene

3000-3100

“Hot & High” — sp² is hotter than sp³

Terminal alkyne =-C–H stretch

3300 cm⁻¹, sharp
“Knife Peak” → razor-sharp spike