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05 IR Chart PDF

This document provides a summary of infrared absorption frequencies for common organic functional groups. Key information includes: 1) Alkyl groups show C-H bending between 1450-1470 cm-1. Alcohols show O-H stretching between 3300-3400 cm-1 and C-O stretching between 1050-1205 cm-1. 2) Alkenes show =C-H stretching between 3020-3140 cm-1 and C=C stretching between 1640-1670 cm-1. Alkynes show C≡C stretching between 2100-2260 cm-1 and ≡C-H stretching between 3265-3335 cm-1

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229 views1 page

05 IR Chart PDF

This document provides a summary of infrared absorption frequencies for common organic functional groups. Key information includes: 1) Alkyl groups show C-H bending between 1450-1470 cm-1. Alcohols show O-H stretching between 3300-3400 cm-1 and C-O stretching between 1050-1205 cm-1. 2) Alkenes show =C-H stretching between 3020-3140 cm-1 and C=C stretching between 1640-1670 cm-1. Alkynes show C≡C stretching between 2100-2260 cm-1 and ≡C-H stretching between 3265-3335 cm-1

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ojasvapal singh
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Alkyls 1450-1470 s C-H bend R-C(O)-OH 1710-1715 s, broad C=O stretch

1370-1390 m CH3 C-H bend C=C-C(O)-OH or 1680-1710 s C=O stretch


1365 + 1395 m -CH(CH3)2 or Ar-C(O)-OH
(two bands) -(CH3)3 bend
715-725 w -(CH2)n bend Esters aliphatic 1160-1210 s-vs O=C-O-C
acetates ~1240 stretch
aromatic 1250-1310
Alkenes 3020-3140 w-m =C-H stretch R-C(O)-O-R 1735-1750 s C=O stretch
1640-1670 vw-m C=C stretch C=C-C(O)-O-R or 1715-1730 s C=O stretch
RCH=CH2 910 + 990 m+s =C-H bend Ar-C(O)-O-R
(two bands) R-C(O)-O-Ar 1760-1790 s C=O stretch
RR’C=CH2 885-895 s =C-H bend
cis-RCH=CHR’ 665-730 m-s, broad =C-H bend Acyl Chlorides
trans-RCH=CHR’ 960-980 s =C-H bend R-C(O)-Cl 1785-1815 s C=O stretch
RCH=CR’R” 790-840 s =C-H bend Ar-C(O)-Cl 1770-1800 s C=O stretch

Alkynes Anhydrides
R-C≡C-H 3265-3335 s, sharp ≡C-H stretch R-C(O)-O-C(O)-R ~1750 + ~1815 s,s C=O symmetric
2100-2140 m C≡C stretch Ar-C(O)-O-C(O)-Ar ~1720 + ~1775 s,s & asym. stretch
610-700 s, broad ≡C-H bend (both two bands)
R-C≡C-R’ 2190-2260 vw-w C≡C stretch Nitriles
R-C≡N 2240-2260 m-s C≡N stretch
Alkyl halides C=C-C≡N or 2220-2240 s C≡N stretch
Ar-C≡N
R-F 1000-1350 vs C-F stretch
R-Cl 750-850 s C-Cl stretch Amines
R-Br 500-680 s C-Br stretch R-NH2 ~3400 + ~3500 w N-H symmetric
R-I 200-500 s C-I stretch (two bands) & asym. stretch
1580-1650 w-m N-H bend
Alcohols 3300-3400 s, broad O-H stretch RR’N-H 3310-33350 w N-H stretch
C=C-CH2-OH 1035-1050 m-s C-O stretch
R-CH2-OH (1o) or 1050-1085 m-s C-O stretch Amides
C=C-CH(R)-OH R-C(O)-NH2 3200-3400 and w-m N-H symmetric
RR’CH-OH (2o) or 1085-1125 m-s C-O stretch 3400-3500 & asym. stretch
C=C-CRR’-OH (two bands)
RR’R”C-OH (3o) 1125-1205 m-s C-O stretch 1650-1690 s, broad C=O stretch
Ar-O-H 1180-1260 m-s C-O stretch 1590-1655 m-s N-H bend
R-C(O)-NH-R 3400-3500 w-m N-H stretch
Ethers 1640-1690 s, broad C=O stretch
R-O-R’ 1085-1150 s C-O-C stretch 1510-1560 m-s N-H bend
Ar-O-R 1020-1075 and m-s =C-O-C sym. R-C(O)-NR’R” 1630-1680 m-s C=O stretch
1200-1275 & asym. stretch
(two band) Nitro Compounds
R-NO2 ~1550 and s N-O symmetric
Aldehydes 2700-2725 m H-C=O stretch ~1370 s & asym. stretch
R-CH=O 1720-1740 s C=O stretch C=C-NO2 or ~1525 and s N-O symmetric
C=C-CH=O or 1685-1710 s C=O stretch Ar-NO2 ~1335 s & asym. stretch
Ar-CH=O (both two bands)

Ketones Aromatic Compounds 3010-3100 m Ar C-H stretch


RR’C=O 1710-1720 s C=O stretch 1450-1600 m-s ring C=C stretch
C=C-C(O)-R 1665-1685 s C=O stretch (two to four bands) sharp
Ar-C(O)-R 1675-1695 s C=O stretch monosubstituted 730-770 and s C-H bend
four member 1770-1780 s C=O stretch 690-710 s C-H bend
cyclic (two bands)
five member 1740-1755 s C=O stretch o-disubstituted 735-770 s C-H bend
cyclic m-disubstituted 750-810 and s C-H bend
six member 1710-1720 s C=O stretch 690-710 s C-H bend
cyclic p-disubstituted 810-840 s C-H bend

Intensity abbreviations: vw = very weak, w = weak, m = medium, s = strong, vs = very strong

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