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- W2751347728 abstract "In the 150 years of history of this subject, one can distinguish six peculiarly definitive periods or moments, spaced roughly 30 years apart. The first was the period around 1820, when Biot discovered optical activity, and Herschel noticed its relation to crystal morphology in quartz. The second was the period of 1850, when Pasteur, by his observations on the morphology of crystalline tartrates in relation to their optical activity in solution, narrowed the cause to one of chirality (handedness) in molecules. The third was the year 1874, when both van’t Hoff and Le Bel advanced the first specific model of molecular chirality, that of structures built from a tetrahedral carbon atom, the model that applies throughout organic chemistry, though other forms of chirality in octahedral inorganic complexes, and in helical secondary structures have since been recognized. Thus was the question of the physics of the light-matter interaction that leads in chiral matter to optical activity asked in the last century: it has been answered in this one. The fourth period was that around 1900, when Drude showed that the dispersion of rotation, like that of refraction, obeyed frequency terms, each with its own resonance denominator, leading in simplest principle to an infinity, and in practice, as we know, to an absorption band. So he forged the first link with spectroscopy, at a time when the electron itself was only in the process of being discovered, when there was no electronic theory of the atom, and no quantum theory, and when nobody had the least idea as to what an absorption band is in molecular terms." @default.
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- W2751347728 date "1967-02-27" @default.
- W2751347728 modified "2023-10-16" @default.
- W2751347728 title "Closing remarks" @default.
- W2751347728 doi "https://doi.org/10.1098/rspa.1967.0060" @default.
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