Numbers of cyanovinyl substitutes and their effect on phenothiazine based organic dyes for dye-sensitized solar cells

Role of π conjugation in n-hexylphenothiazine dyes for solar cell-a density functional theory approach

The N-hexylphenothiazine-based organic sensitizers are designed for Dye Sensitized Solar Cell (DSSC). The different π spacer (thiophene and cyanovinyl) groups were substituted in third and seventh position N-hexylphenothiazine. From the structural modifications, the π spacer effect was analyzed. The optoelectronic properties of the dyes were tuned by structural modifications. The optimized geometry, highest occupied molecular orbital and lowest unoccupied molecular orbital energy level, and absorption spectra were calculated. The natural bond orbital analysis gives the net electron transfer from the donor to acceptor. The electrochemical properties and light-harvesting efficiency of the designed dye sensitizers were calculated. The π spacer increase resulted in the redshift of the absorption peak. Based on the density functional theory and time dependant density functional theory calculations, the designed dye molecules are evaluated for DSSC application.

Access to Phenothiazine Derivatives via Iodide-Mediated Oxidative Three-Component Annulation Reaction

Herein, a new iodide-mediated three-component annulation reaction of secondary anilines, cyclohexanones, and elemental sulfur is demonstrated, which allows access to various phenothiazines with the merits of formation of multiple chemical bonds in one single operation, high step and atom efficiency, readily available feedstocks and catalyst system, and good substrate and functional group compatibility. The developed chemistry capable of constructing novel phenothiazines with structural diversity offers a significant basis for further applications.

Interaction of pyridine π-bridge-based poly(methacrylate) dyes for the fabrication of dye-sensitized solar cells with the influence of different strength phenothiazine, fluorene and anthracene sensitizers as donor units with new anchoring mode

A simple and low-cost approach for the synthesis of three novel propeller-shaped (D₂)–π–A type organic polymer dyes has been developed; a new acceptor and π-bridge (PYN) were used to tune the photoelectric properties: DFT studies.