In-plane ring deformation mode

The results of these experiments are shown in Figure 9. Of the spectral features apparent in the lgG2a antibody spectram, the most intense band at 1000 cm likely arises from the in-plane ring deformation mode of Phe in IgG (50,51). The amide III protein mode at 1260 cm may be observed in both the IgG and RSV+IgG spectra (52), however, unique, prominent bands are observed in the 1400 - 1600 cm" region, presumably due to selectively enhanced nucleic acid and/or side-chain vibrations (53,54). 

Note. The vi ring breathing mode (992 cm ) lies within 20 cm of the vi2 in-plane ring deformation mode (1010 cm ). This is not unexpected as the two modes have many similar features. 

Three /3-CH modes corresponding to in-plane C—H deformations are also observed (Table 22) and are probably best depicted as in (27), (28) and (29), although those for pyrrole will be modified as a result of interaction with the in-plane N—H deformation. The skeletal ring breathing mode (30) observed at ca. 1137 cm for 2-substituted pyrroles and... 

The characteristic bands in the IR spectra of thiophenes have been recorded. " 2-Substituted thiophenes show ring-stretching frequences at 1537-1509, 1444-1402, and 1365-1339 cm" which have been assigned to characteristic modes of vibration. The hydrogen in-plane deformation bands occur at 1086-1077 and at 1053-1031 cm. The... 

---