By Dana W Mayo; Foil A Miller; R W Hannah
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Extra resources for Course notes on the interpretation of infrared and Raman spectra
C. CCl4. There is a sum tone 459 (Raman) þ 314 (IR) ¼ 773 cmÀ1. This interacts with a fundamental near 775 cmÀ1 to give Raman bands at 762 and 790 cmÀ1. 15. d. Benzene. There is a sum tone 606 (Raman) þ 992 (Raman) ¼ 1598 cmÀ1. 6). XVI. ’’ The far IR was usually the low-wavenumber INTRODUCTION 31 À Fig. 22 Effect of deuteration on CÀ À ÀO band of cyclopentanone: (a) cyclopentanone; (b) cyclopentanone-a:a:a0 :a0 -d4. Chloroform solution, 2 cmÀ1 spectral slit. range which was inaccessible to an instrument.
It has a center of symmetry, so we now know why the observed IR and Raman bands do not coincide. 4. For a molecule with a center of symmetry, it is especially useful to have both IR and Raman spectra. XIV. Introduction to Raman group frequencies A. Comparison of some IR vs. Raman group frequencies F H B C F F Planar trigonal. 1 2 Fig. 18 3 F F P H H H 4 Do these molecules have a center of symmetry? F 5 F F 26 INTRODUCTION 1. Summary table: IR VS. RAMAN GROUP FREQUENCIES Weak in IR, Intense in IR, Intense in Intense in Raman Weak in Raman Both CÀ À CÀ ÀF stretch À ÀCÀ À À ÀC stretch À ÀN stretch CÀ OÀ ÀH stretch >CÀ ÀC stretch ÀO stretch NÀ NÀ ÀH stretch CÀ ÀCl stretch ÀN stretch SÀ ÀH stretch CÀ ÀH out-of-plane bend À ÀNO2 stretch CÀ ÀS stretch CÀ ÀS stretch SÀ ÀS stretch CH2 twist and wag 2.
7. J. Opt. Soc. Am. 52, 476 (1962). 2 Characteristic Frequencies of Alkanes DANA W. MAYO I. General appearance of alkane spectra A. Vibrational modes present in saturated hydrocarbons. 1. Because these systems have a simple elemental composition consisting of only hydrogen and carbon, they will possess a relatively simple distribution of normal modes which can be divided into: Carbon–hydrogen vibrations and carbon–carbon vibrations These two groups of vibrations can be further subdivided roughly into CÀ ÀH and CÀ ÀC stretching modes and CÀ ÀH and CÀ ÀC bending modes.