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preface to fifteenth edition

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SPECTROSCOPY 7.71<br />

7.6 RAMAN SPECTROSCOPY<br />

TABLE 7.30<br />

Raman Frequencies of Single Bonds <strong>to</strong> Hydrogen and Carbon<br />

Abbreviations Used in the Table<br />

m, moderately strong<br />

m–s, moderate <strong>to</strong> strong<br />

m–vs, moderate <strong>to</strong> very strong<br />

s, strong<br />

vs, very strong<br />

vw, very weak<br />

w, weak<br />

w–m, weak <strong>to</strong> moderately strong<br />

w–vs, weak <strong>to</strong> very strong<br />

Group Band, cm 1 Remarks<br />

Saturated C9H and C9C<br />

9CH 3<br />

9CH 2 9<br />

2969–2967 (s)<br />

2884–2883 (s)<br />

ca 1205 (s)<br />

1150–1135<br />

1060–1056<br />

975–835 (s)<br />

280–220<br />

2949–2912 (s)<br />

2861–2849 (s)<br />

1473–1443 (m–vs)<br />

1305–1295 (s)<br />

1140–1070 (m)<br />

888–837 (w)<br />

425–150<br />

500–490<br />

In aryl compounds<br />

In unbranched alkyls<br />

In unbranched alkyls<br />

Terminal rocking of methyl group<br />

CH 2 9CH 3 <strong>to</strong>rsion<br />

Intensity proportional <strong>to</strong> number<br />

of CH 2 groups<br />

Often two bands; see above<br />

Substituent on aromatic ring<br />

9CH(CH 3 ) 2<br />

1350–1330 (m)<br />

835–750 (s) If attached <strong>to</strong> C"C bond, 870–<br />

800 cm 1 . If attached <strong>to</strong> aryl<br />

ring, 740 cm 1<br />

9C(CH 3 ) 3<br />

1265–1240 (m)<br />

1220–1200 (m)<br />

760–685 (vs)<br />

Not seen in tert-butyl bromide<br />

Not seen in tert-butyl bromide<br />

If attached <strong>to</strong> C"C or aromatic<br />

ring, 760–720 cm 1<br />

Internal tertiary<br />

carbon a<strong>to</strong>m<br />

855–805 (w)<br />

455–410<br />

Internal quaternary<br />

carbon a<strong>to</strong>m<br />

710–680 (vs)<br />

490–470

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