. Biophysical science. Biophysics. 514 Quantum Mechanical Basis of Molecular Spectra /27 : 3 gel (as nujol) or as part of a pressed KBr disc. The preparation by either method does alter the spectrum. Some typical absorption bands are given in Table II. Group >C =N >c =s, -N = N-, >so4 -OH TABLE II Infrared Absorptions •N = S = °o} in r* or longer 8 Group in fi >NH -SH -OD >ND CH The various types of covalent bonds each have several absorption maxima corresponding to different types of vibrations. Randal
. Biophysical science. Biophysics. 514 Quantum Mechanical Basis of Molecular Spectra /27 : 3 gel (as nujol) or as part of a pressed KBr disc. The preparation by either method does alter the spectrum. Some typical absorption bands are given in Table II. Group >C =N >c =s, -N = N-, >so4 -OH TABLE II Infrared Absorptions •N = S = °o} in r* or longer 8 Group in fi >NH -SH -OD >ND CH The various types of covalent bonds each have several absorption maxima corresponding to different types of vibrations. Randal and. 5 6 7 8 9 10 II 12 Wavelength (\l) Figure 2. Infrared absorption spectrum of 1-a-dimyristoyl cephalin. Absorption bands in the infrared are due to molec- ular vibrations and rotations. After H. P. Schwarz et al., "Infrared Studies of Tissue Lipides," Annals of the New York Academy of Sciences 69: 116 (1957). co-workers classify the vibrations responsible for the absorption spectra as: (1) stretching (along the bond); (2) bending (across the bond); (3) deformation—a bending which changes the bond angle; (4) wagging —an entire group moving perpendicular to the plane of symmetry; (5) rocking—similar to wagging but in the plane of symmetry; (6) twisting—an entire group rotates around a bond to the rest of the molecule; (7) breathing—completely symmetric stretching—usually in rings; and (8) others not yet Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ackerman, Eugene, 1920-. Englewood Cliffs, N. J. , Prentice-Hall
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