Wagging vibrations

Figure 6.13 Illustration of (a) rocking, (b) twisting, (c) scissoring and (d) wagging vibrations in a CH2 group. Also shown are (e) the torsional vibration in ethylene, (f) the ring-breathing vibration in benzene and (g) the inversion, or umbrella, vibration in ammonia...

Bending vibrations in one plane (symbol 8), changing bond angles but leaving bond lengths unaltered (in larger molecules further divided into rock, twist and wag vibrations),... 

Another band characteristic of the dimeric acid species arises from the O—H out-of-plane deformation (wag) vibration which appears as a broad, rather weak, band at 950-900 cm-1 and is seen in the spectrum of hexanoic acid its maximum intensity is at about 940 cm-1. 

Table 11 Character table for the double rotation without the cog-wheel effect and wagging vibration mode in pyrocathechin.

Another interesting example of a molecule with amino inversion and internal rotation is hydrazine, H2N NH2 (Fig. 20). In hydrazine, there are three large amplitude motions (i) two wagging vibrations of the NH2 groups which may be... 

In the Raman spectrum of polyethylene the main peak of the bending vibrations is observed at 1437 cm, while a wagging vibration shows a weak band at 1370 cm and a twisting vibration gives a strong band at 1295 cm The stretching vibrations of the C-C chain are observed at 1126 and 1059 cm, respectively, in the Raman spectrum (Figs. 4.1-2A and 4.1-3). A normal coordinate calculation of polyethylene is published by Tasumi et al. (1962). 

---