Page 202 - Academic Press Encyclopedia of Physical Science and Technology 3rd Analytical Chemistry

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Encyclopedia of Physical Science and Technology EN007C-340 July 10, 2001 14:45

Infrared Spectroscopy 813

TABLE IV Selected Spectra Structure Correlations
)
Group a Wave number region (cm −1 b Assignment c
Alkanes
R CH 2 R 2936–2916 s Out-of-phase str.
R CH 2 R 2863–2843 m In-phase str.
R CH 2 R 1475–1450 m CH 2 def.
CH 2 CH 2 CH 2 CH 2 726–722 w In-phase rock d
R CH 3 2972–2952 s Out-of-phase str.
R CH 3 2882–2862 m In-phase str.
R CH 3 1475–1450 m Out-of-phase def.
R CH 3 1383–1377 m In-phase def.
C(CH 3 ) 2 1389–1381 m Sym. in-phase def.
C(CH 3 ) 2 1372–1368 m Antisym. in-phase def.
C(CH 3 ) 3 1401–1393 m Sym. in-phase def.
C(CH 3 ) 3 1374–1366 s Antisym. in-phase def.
Olefins
C C 1680–1630 mw C C str.
C CH 2 3100–3075 w CH 2 out-of-phase str.
R CH CH 2 995–985 s Trans CH wag e
R CH CH 2 910–905 s CH 2 wag
R 2 C CH 2 895–885 s CH 2 wag
RCH CHR (trans) 980–965 s Trans CH wag
RCH CHR (cis) 730–650 m Cis CH wag
CH 2 CH CO OR 970–960 m CH 2 wag
CH 2 CH O R 820–810 s CH 2 wag
X Y and X Y Z
C C C H 2140–2100 w C C str.
C C C H 3340–3267 s C H str.
C C N 2260–2240 m C N str.
C N (conjugated) 2240–2220 v C N str.
S C N 2170–2135 m C N str.
C C CH 2 2000–1900 s Out-of-phase str.
N C O 2275–2263 s Out-of-phase str.
N C S 2150–2050 s Out-of-phase str.
Aromatics
Aromatic CH 3100–3000 w CH str.
Aromatic ring 1620–1585 v Ring str.
Aromatic ring 1590–1565 v Ring str.
Aromatic ring 1525–1470 v Ring str.
Mono and meta 710–665 s Ring bend out of plane
Five adjacent ring H’s 800–730 s In-phase CH wag
Four adjacent ring H’s 805–735 s In-phase CH wag
Three adjacent ring H’s 825–750 s In-phase CH wag
Two adjacent ring H’s 860–795 s In-phase CH wag
Isolated ring H 935–810 s CH wag
Carbonyls
R CO R 1725–1705 s C O str.
Conjugated ketones 1700–1640 s C O str.
R CO H 1740–1720 s C O str.
Aryl CO H 1710–1685 s C O str.
R CO O R 1750–1735 s C O str.
continues