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Heterocyclic Substituted Arendiazonium Salts with a Long‐wave‐length Range of Sensitivity — Part I: Monomethins and Azamethins Two new types of arendiazonium salts have been synthesized. In these compounds a heterocycliden ring is bridged through a methine group (8a–o) or a nitrogen (11a–c) with the 4‐position of a benzene diazonium group. Both types show sensitivity towards normal day‐light, their long wave‐length absorption band vary from 430 nm up to 590 nm, depending on the donor strength of the heterocycliden ring and the nature of the bridging group. The thermostability, the quantum yields of photochemical dediazonation and the coupling behaviour of the diazonium salts are investigated, in order to evaluate their potential applicability in a commercial diazotype system.

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