Abstract
IN a paper by L. G. S. Brooker and C. H. Keyes1, the preparation is described of certain isomeric eyanine dyes having the following formulæ: Brooker and Keyes noted that dyes Aand C were strong sensitizers, while Band D did not sensitize. These substances were investigated later by J. A. Leermakers, B. H. Carroll and C. J. Staud2, who confirmed the sensitizing results. But in addition they observed strong adsorption to gelatino-silver bromide grams of all the isomers, and "pronounced absorption maxima (by reflection)".
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References
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SHEPPARD, S., LAMBERT, R. & WALKER, R. Steric Influence in Optically Sensitizing Dyes. Nature 145, 386 (1940). https://doi.org/10.1038/145386a0
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DOI: https://doi.org/10.1038/145386a0
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