Novel luminescent phenothiazine-based Schiff bases with tuned morphology. Synthesis, structure, photophysical and thermotropic characterization

Luminescent guest–host composite films based on an azomethine dye in different matrix polymers

“…As we reported before, the thin film DPF azomethine dye presents an absorption maximum around 392 nm -attributed to the chromophoric unit formed by an extended conjugation of the azomethine linkage with both fluorene and phenothiazine units [16]. Compared to the DPF pure film, the DPF/polymer composites absorbtion spectra show significant changes, indicating the influence of the matrix polymer on the DPF optical behavior.…”

“…2b). No crystalline state appears from the melting state [16]. The structures of the DPF and the used polymers are presented in Scheme 1.…”

“…As luminescent component we have chosen an azomethine dimer based on fluorene and phenothiazine chromophores (DPF), which showed high quantum yield in solid state besides high thermal stability [16]. The DPF dimer has been synthesized by classical condensation reaction of 3-formyl-10-methyl-phenothiazine with 9,9-bis(p-aminophenyl)-fluorene, in a 2:1 M ratio, using dimethylformamide as a solvent.…”

“…The present work reports obtaining of new composites using a low molecular weight dye emitting green light with high quantum yield [16] and poly(methyl methacrylate), polysulfone and chitosan as polymer matrix. The properties of new obtained composites have been studied in terms of morphology and optical behavior by polarizing optical microscopy, scanning electron microscopy, atomic force microscopy, UV-vis and photoluminescence spectroscopy.…”

“…In this context, we decided to obtain and study the photophysical properties of new azomethine dye-polymer composites using a high quantum yield azomethine dimer synthesized in our laboratories [16]. Regarding the polymer matrix, we have chosen PMMA but also another two high performance polymers which have proper features to replace the PMMA, besides other good properties.…”