Abstract
Compounds of the cyanine type show a wide variation in colour, whilst possessing comparatively simple chemical structures. They are, therefore, particularly suitable for a study of the relationship between colour and constitution. Such a study, for certain fairly simple series of cyanine dyes, free from substituents, forms the subject of the present paper. The cyanines are characterized by possessing two heterocyclic nuclei containing nitrogen. One of our objects was to find how the colour varies according to the nature of the nuclei, but we restricted the investigation to those series in which the two nuclei are identical.
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38 articles.
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