The Raman Effect in Organic Substances and its Use in Chemical Problems

Tautomerism: Introduction, History, and Recent Developments in Experimental and Theoretical Methods

“…In 1908, von Liebig [53] studied the fluorescence of organic dyes, some of which are tautomeric. In 1931, Raman effect was discussed in relation to the tautomerism of acetoacetic ester by Dadieu and Kohlrausch [54]. According to Kol'tsov and Kheifets [55], the first study in which NMR was employed to investigate tautomerism was published in 1953 [56].…”

Raman Spectra in Inorganic Chemistry.

“…The magnitude of this shift is of the same order as that attributed to the <-> O vibration by Av 3388 in methyl alcohol (193) and Av 3420 for the <-> O vibration in ethyl alcohol (203). Nielsen has pointed out that if one assumes the vibration frequencies can be expressed by the formula given by Mecke (206), two vibration frequencies are obtained which do not deviate much from each other.…”

Some Physical Aspects of Atomic Linkages.

“…The Raman effect was discovered in benzene (53, 54), and a large number of liquids have been since examined. Dadieu and Kohlrausch (29,30,52) have described and discussed the results obtained with over one hundred organic liquids. Some leading results may be mentioned.…”

“…The effect was reported by Raman in the spring of 1928. The literature dealing with the subject is, however, already very large, and it is fortunate that able summarizing papers are available, by Raman (27), Smekal (28), Dadieu and Kohlrausch (29), and Kohlrausch (30). Smekal (31), in 1923, extended arguments of Compton and Epstein (on the alteration in size of x-ray quanta on endowing free electrons with kinetic energy) to include collisions between quanta of visible light and atomic or molecular systems with attendant energy changes.…”

“…Dadieu and Kohlrausch (29,30) have studied the influence of substituent groups replacing H attached to C of the linkages C-H and C=0 in respect to characteristic frequencies. It is found, for instance, that OH increases the frequency of C-H in HCOOH, whilst the C=0 frequency is decreased.…”