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- W2003188305 abstract "1. Dichroism of the electronic spectra over 220 mμ was measured for 1,1′-diethyl-2,2′-cyanine, -dicarbocyanine, and -tricarbocyanine iodide, and -4,4′-cyanine iodide, respectively, in the stretched polyvinylalcohol sheets under the stretch ratio of about 6∼10. 2. The correspondence of the transition directions of absorptions and the chemical structures, and the classification of the absorption bands were made into tables. 3. All the dichroic behaviors of the absorption bands could be interpreted by the transitions along the longitudinal axis of the molecule and by those, localized in the quinoline nuclei, of two directions at right angles. 4. It was confirmed that the second group absorptions correspond to the overtone of the first group ones. It was shown by the schematical potential curves that the systematic changes in the band distances in these groups with the variation of the methine bond number may be plausibly explained in connection with the vibrational states. 5. It was pointed out that a reasonable understanding for certain experimental facts in dichroism is given by regarding the molecular structures as follows; 1,1′-diethyl-2,2′-cyanine and -4,4′-cyanine are far from planar because of their particular great steric hindrance, and the other cyanines are strained by the successive addition of a peculiar twisting angle per methine bond." @default.
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- W2003188305 date "1960-09-01" @default.
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- W2003188305 title "Dichroism of Dyes in the Stretched PVA Sheet. IV. Absorption Spectra of Carbocyanines and Note on the Chemical Structures" @default.
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- W2003188305 doi "https://doi.org/10.1246/bcsj.33.1207" @default.
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