Headgroup modes

Due to their low inherent intensity and overlap by headgroup modes, the complete set of the CH2 wagging and the twisting-rocking progressions are generally not useful in studies of surfactants. 

Headgroup Modes. Table II summarizes the bands due to headgroup vibrations of the surfactants to be discussed in this chapter, i.e. it is not an exhaustive list. As discussed further below, the combination of spectroscopic data from both the headgroups and tails of micellar surfactants of different size and shape can provide information about molecular packing. 

Headgroup Modes. Additional information about the changes in molecular packing with compositional changes can be obtained from inspection of the spectra in the fingerprint region. Figure 15 shows the spectra of the various mixtures. 

The band positions of the headgroup modes for the synthetic spectra in Figure 7 are the same as observed for the 0.40 M CgAO solution (Figure 5) ... 

The appearance of rodlike micelles at Z=0.5 also influences the headgroup modes as shown in Table 3, for example, the frequency of the oa C-N-O bands is... 

The changes in frequency for the headgroup modes are relatively small, in contrast to the large shifts in the CH stretching bai associated with the immomer to micelle transition. As shown in Tables 2 3, the CHj-N defonnation and the... 

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