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preface to fifteenth edition

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SPECTROSCOPY 7.65<br />

TABLE 7.27<br />

Absorption Frequencies in the Near Infrared (Continued)<br />

Class Band,cm 1 Remarks<br />

Alkanes<br />

9CH 3 9000–8350 (0.02)<br />

5850–5660 (0.1)<br />

4510–4280 (0.3)<br />

9CH 2 9 9170–8475 (0.02)<br />

5830–6640 (0.1)<br />

4420–4070 (0.25)<br />

CH 8550–8130 All bands very weak<br />

7000–6800<br />

5650–5560<br />

Cyclopropane 6160–6060<br />

4500–4400<br />

Alkenes<br />

C"C<br />

6850–6370 (1.0)<br />

H<br />

C"CH 2<br />

and 9CH"CH 2 7580–7300 (0.02)<br />

6140–5980 (0.2)<br />

4760–4700 (1.2)<br />

H H<br />

C"C<br />

4760–4660 (0.15) Trans isomers have no unique bands.<br />

9O9CH"CH 2<br />

6250–6040 (0.3)<br />

9CO9CH"CH 2 7580–7410 (0.02)<br />

6190–5990 (0.3)<br />

4820–4750 (0.2–0.5)<br />

Amides<br />

Primary 7400–6540 (0.7) Two bands; over<strong>to</strong>ne of NH stretch<br />

5160–5060 (3.0)<br />

5040–4990 (0.5)<br />

4960–4880 (0.5)<br />

Second over<strong>to</strong>ne of C"O stretch;<br />

second over<strong>to</strong>ne of NH deformation;<br />

combination of C"O and NH<br />

Secondary 7330–7140 (0.5)<br />

5050–4960 (0.4)<br />

Over<strong>to</strong>ne of NH stretch<br />

Combination of NH stretch and NH<br />

bending<br />

Amines,aliphatic<br />

Primary 9710–9350 Second over<strong>to</strong>ne of NH stretch<br />

6670–6450 (0.5) Two bands; over<strong>to</strong>ne of NH stretch<br />

5075–4900 (0.7) Two bands; combination of NH<br />

stretch and NH bending<br />

Secondary 9800–9350<br />

6580–6410 (0.5)<br />

Amines,aromatic<br />

Primary 9950–9520 (0.4)<br />

7040–6850 (0.2)<br />

6760–6580 (1.4)<br />

5140–5040 (1.5)<br />

Secondary 10 000–9710<br />

6800–6580 (0.5)<br />

Second over<strong>to</strong>ne of NH stretch<br />

Over<strong>to</strong>ne of NH stretch

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