Strongly Coupled Phenazine–Porphyrin Dyads: Light-Harvesting Molecular Assemblies with Broad Absorption Coverage

Abstract

The development of light-harvesting architectures with broad absorption coverage in the visible region continues to be an important research area in the field of artificial photosynthesis. Here, we introduce a new class of ethynyl-linked panchromatic dyads composed of dibenzophenazines coupled ortho and meta to tetrapyrroles with an anchoring group that can be grafted onto metal oxide surfaces. Quantum chemical calculations and photophysical measurements of the synthesized materials reveal that both of the dibenzophenazine dyads absorb broadly from 300 to 636 nm and exhibit absorption bands different from those of the constituent chromophore units. Moreover, the different points of attachment of dibenzophenazines to tetrapyrroles give different absorption profiles which computations suggest result from differences in the planarity of the two dyads. Applicability of the dyads in artificial photosynthesis systems was assessed by their incorporation and characterization of their performance in dye-sensitized solar cells.

Exploring the Effect of the Irradiation Time on Photosensitized Dendrimer-Based Nanoaggregates for Potential Applications in Light-Driven Water Photoreduction

“…Considering this, gaining a better understanding of natural photosynthesis at the molecular level has attracted much attention lately in order to create artificial photosynthetic systems having photoactive and donor–acceptor compounds [16,17,18,19]. Indeed, a significant amount of research effort has been directed toward the development of artificial systems composed of covalently attached molecules [20,21] or supramolecular arrangements [22,23]. According to this approach, macromolecular structures with well-defined architectures and monodispersity emerge as relatively viable and interesting alternatives for the development of viable photoactive systems [24,25,26].…”

Synthesis, Spectral, Electrochemical and Photovoltaic Studies of A3B Porphyrinic Dyes having Peripheral Donors

“…[1][2] A number of organic and inorganic dyes have been developed for DSSCs applications. [8][9][10][11] In recent years, "push-pull" or D-π-A type porphyrin dyes have made positive impact as highly efficient dyes which consist of electron donor (push) and electron acceptor (pull) groups linked via πbridges. [3][4][5][6][7] Modification of the porphyrin framework via β-pyrrole and meso-carbon functionalization provide a good way to develop low cost and highly efficient dyes for DSSCs; consequently, many porphyrin dyes have been reported for DSSCs applications in the literature.…”

“…[3][4][5][6][7] Modification of the porphyrin framework via β-pyrrole and meso-carbon functionalization provide a good way to develop low cost and highly efficient dyes for DSSCs; consequently, many porphyrin dyes have been reported for DSSCs applications in the literature. [8][9][10][11] In recent years, "push-pull" or D-π-A type porphyrin dyes have made positive impact as highly efficient dyes which consist of electron donor (push) and electron acceptor (pull) groups linked via πbridges. [12,13] This dye architecture increased the light harvesting ability along with efficient electron injection capabilities, the desirable properties of efficient DSSCs.…”

Quantum Biology: An Update and Perspective

“…To counteract this, investigations into energy transfer dynamics in photosynthetic complexes have recently been conducted in simpler bioinspired synthetic systems constructed with biological and synthetic parts. Such hybrid biotic/abiotic systems are also of interest because they could provide the prototypes of next-generation green energy technologies including incorporation into solar cells [180,181]. Alongside theoretical modelling of the quantum dynamics of both charge and energy transfer in an artificial system [182], such an approach can complement lab-based investigations [183].…”