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preface to fifteenth edition

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SPECTROSCOPY 7.55<br />

TABLE 7.24<br />

Absorption Frequencies of Other Double Bonds (Continued)<br />

Group Band,cm 1 Remarks<br />

Imines,oximes,and amidines<br />

C"N9 (continued)<br />

Imino thioethers 9S9C"N" 1640–1605 (var)<br />

Imine oxides<br />

<br />

C"N9O<br />

1620–1550 (s)<br />

Amidines N9C"N9 1685–1580 (var)<br />

Benzamidines Aryl9C"N9N 1630–1590<br />

Guanidine<br />

N9C"N9<br />

N<br />

1725–1625 (s)<br />

Azines C"N9N"C 1670–1600<br />

Hydrazoke<strong>to</strong>nes<br />

9CO9C"N9N<br />

1600–1530 (vs)<br />

Azo compounds 9N"N9<br />

Azo 9N"N9<br />

Aliphatic ca 1575 (var) Very weak or inactive<br />

Aromatic<br />

cis<br />

ca 1510 (w)<br />

trans<br />

1440–1410 (w)<br />

Azoxy<br />

<br />

9N"N9<br />

Aliphatic<br />

Aromatic<br />

O <br />

1590–1495 (m–s)<br />

1345–1285 (m–s)<br />

1480–1450 (m–s)<br />

1340–1315 (m–s)<br />

Azothio<br />

<br />

9N" N9S9<br />

1465–1445 (w)<br />

1070–1055 (w)<br />

Nitro compounds N"O<br />

Nitro C9NO 2<br />

Aliphatic<br />

ca 1560 (s)<br />

1385–1350 (s)<br />

The two bands are due <strong>to</strong> asymmetrical<br />

and symmetrical stretching<br />

of the N"O bond. Electronwithdrawing<br />

substituents adjacent<br />

<strong>to</strong> nitro group increase the frequency<br />

of the asymmetrical band<br />

and decrease that of the symmetrical<br />

frequency.

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