a new class of dyes and photographic products containing these dyes merocyanines

摘要

Novel merocyanine dyes are provided which feature first and second nuclei joined by a double bond, a dimethine, a tetramethine or hexamethine linkage, the first nucleus being a rhodanine nucleus or 2-thiobarbituric acid nucleus joined at the five-carbon atom thereof to said linkage; and, the other nucleus being a five- to six-membered nitrogen-containing heterocyclic basic nucleus of the type used in merocyanine dyes joined at a carbon atom thereof to said linkage, said heterocyclic nitrogen atom of said nucleus having attached thereto a tertiary aminoalkyl group.