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preface to fifteenth edition

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SPECTROSCOPY 7.77<br />

TABLE 7.32<br />

Raman Frequencies of Cumulated Double Bonds<br />

Abbreviations Used in the Table<br />

s, strong vw, very weak<br />

vs, very strong w, weak<br />

Group Band, cm1<br />

Remarks<br />

Allenes<br />

C"C"C 2000–1960 (s) Pseudo-asymmetric stretching<br />

1080–1060 (vs) Symmetric stretching<br />

356 C"C"C bending<br />

Carbodiimides (cyanamides)<br />

9N"C"N9 2140–2125 (s) Asymmetric stretching of aliphatics<br />

2150–2100 (vs) Asymmetric stretching of aromatics; two bands<br />

1460 Symmetrical stretching of aliphatics<br />

1150–1140 (vs) Symmetric stretching of aryls<br />

Cumulenes (trienes)<br />

C"C"C"C<br />

2080–2030 (vs)<br />

878<br />

Isocyanates<br />

9N"C"O 2300–2250 (vw) Asymmetric stretching<br />

1450–1400 (s) Symmetric stretching<br />

Isothiocyanates<br />

9N"C"S 2220–2100 Two bands<br />

690–650 Alkyl derivatives<br />

Ketenes<br />

C"C"O 2060–2040 (vs) Pseudo-asymmetric stretching<br />

1130 (s) Pseudo-symmetric stretching<br />

1374 (s) Alkyl derivatives<br />

1120 (s) Aryl derivatives<br />

Sulfinylamines<br />

R9N"S"O 1306–1214 (w) Asymmetric stretching<br />

1155–989 (s) Symmetric stretching

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