A rare case of a dye co-crystal showing better dyeing performance

Abstract

A rare case of a pyridine-2,4-dione based heterocyclic dye co-crystal, composed of a 1 : 1 molar ratio of two structural analogs (pyridine N-Me and N-Et substituents) in the hydrazone form, is described with better dyeing performance, and this dye co-crystal can be prepared by both recrystallization in solution and solid-state co-sublimation methods.