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- W4247482034 abstract "LONDON Royal Society, March 2.—T. M. LOWRY and H. HUDSON: Optical rotatory power. (4) Rotatory dispersion of bornyl and menthyl xanthates, especially in the region of absorption. The fundamental problems of the form of the absorption bands in organic compounds, and of the relationship between absorption, circular dichroism and rotatory dispersion in optically-active compounds, are discussed on the basis of experiments made with the bornyl and menthyl xanthates and dithiourethanes prepared and studied by Tschugaeff. The experimental curves are symmetrical on a scale of wave-lengths. The ratio of the dichroism to the absorption of unpolarised light is approximately proportional to the frequency through out the greater part of the first band, but on the side of shorter wave-lengths the circular dichroism decreases rapidly, becoming opposite in sign for three of the compounds. It is therefore suggested that the neighbouring absorption band at shorter wave lengths is also optically active, but that its circular dichroism is opposite in sign to that of the first band. The rotatory dispersion of these compounds has also been measured in the visible and ultra-violet spectrum, including the region covered by the first absorption band. W. F. K. WYNNE-JONES: Acid strength and its dependence upon the nature of the solvent. The dissociation constants of acids in any particular solvent cannot be regarded as a measure of their real relative strengths, since it has been found by Goldschmidt and others that the order of the dissociation constants for a series of acids is dependent upon the solvent. The change in the dissociation constant of an acid on going from one solvent to another is determined partly by the relative basicities of the solvents and partly by the electrical forces between the ions. Since the effect of the former must be the same for all acids, it is proposed to eliminate it by considering not the actual dissociation constants but the constants rela tive to some standard size. The variations in these relative dissociation constants should then be deter mined by the electrical forces, and, on the basis of the Born equation, a relationship is deduced." @default.
- W4247482034 created "2022-05-12" @default.
- W4247482034 date "1933-03-01" @default.
- W4247482034 modified "2023-09-27" @default.
- W4247482034 title "Societies and Academies" @default.
- W4247482034 doi "https://doi.org/10.1038/131374a0" @default.
- W4247482034 hasPublicationYear "1933" @default.
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