Selected Infrared Correlations | Lecture Note - Edubirdie

University:
California State University, Northridge
Course:
CHEM 101 | General Chemistry I
Academic year:

2017
Views:

103

Pages:

2
Author:

Zander Ortega

Selected Infrared Correlations Hydrocarbons Alkyl C–H stretch Aromatic C–H stretch Alkenyl C–H stretch Alkynyl C–H stretch 3000–2840 cm-1 3080–3030 cm-1 3100–3010 cm-1 3340–3250 cm-1 medium–strong variable medium strong ~ 1200 cm-1 1625–1575, 1525–1450 cm-1 1680–1640 cm-1 1640–1620 cm-1 2260–2190 cm-1 2140–2100 cm-1 weak variable medium weak weak medium Alkyl Halides C–F stretch C–Cl stretch C–Br stretch C–I stretch 1400–1000 cm-1 800–600 cm-1 600–500 cm-1 ~ 500 cm-1 strong strong strong strong Alcohols O–H stretch 3650–3200 cm-1 strong, broad C–O stretch 1210–1000 cm-1 strong Ethers C–O stretch 1275–1085, 1125–870 cm-1 strong Amines N–H stretch (1o amine) N–H stretch (2o amine) 3500, 3400 cm-1 3500–3310 cm-1 medium medium 1360–1250 cm-1 1410, 1220–1020 cm-1 strong weak–medium Alkyl C–C stretch Aromatic C–C stretch Isolated Alkenyl C=C stretch Conjugated Alkenyl C=C stretch Internal Alkynyl C≡C stretch Terminal Alkynyl C≡C stretch Aromatic C–N stretch Aliphatic C–N stretch Imines C=N stretch 1690–1630 cm-1 variable Nitriles C≡N stretch 2260–2220 cm-1 medium Carbonyl Compounds C=O stretch ketone aldehyde ester lactone carboxylic acid acid anhydride acid chloride amide lactam 1870–1630 cm-1 1750–1660 cm-1 1740–1660 cm-1 1800–1720 cm-1 1820–1730 cm-1 1730–1680 cm-1 1870–1780, 1830–1720 cm-1 1800–1720 cm-1 1700–1630 cm-1 1780–1680 cm-1 strong 2900–2820, 2780–2700 cm-1 weak C–H stretch (aldehyde) O–H stretch (carboxylic acid) N–H stretch (1o amide) N–H stretch (2o amide) ~ 3000 cm-1 3500–3350, 3400–3180 cm-1 3430–3140 cm-1 very broad medium medium Notes: 1. The effect of conjugation is to decrease a functional group's absorption maximum to a lower wavenumber. The effect of angle strain is to increase a functional group's absorption maximum to a higher wavenumber. 2. See Appendices 2A and 2B of Wade, Organic Chemistry, for much more detailed infrared correlation tables.

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