Photophysics and Electrochemistry of Biomimetic Pyranoflavyliums: What Can Bioinspiration from Red Wines Offer

Author:

Espinoza Eli MisaelORCID,Clark John AnthonyORCID,Billones Mimi Karen,Silva Gustavo Thalmer de MedeirosORCID,Silva Cassio Pacheco da,Quina Frank Herbert,Vullev Valentine IvanovORCID

Abstract

Natural dyes and pigments offer incomparable diversity of structures and functionalities, making them an excellent source of inspiration for the design and development of synthetic chromophores with a myriad of emerging properties. Formed during maturation of red wines, pyranoanthocyanins are electron-deficient cationic pyranoflavylium dyes with broad absorption in the visible spectral region and pronounced chemical and photostability. Herein, we survey the optical and electrochemical properties of synthetic pyranoflavylium dyes functionalized with different electron-donating and electron-withdrawing groups, which vary their reduction potentials over a range of about 400 mV. Despite their highly electron-deficient cores, the exploration of pyranoflavyliums as photosensitizers has been limited to the “classical” n-type dye-sensitized solar cells (DSSCs) where they act as electron donors. In light of their electrochemical and spectroscopic properties, however, these biomimetic synthetic dyes should prove to be immensely beneficial as chromophores in p-type DSSCs, where their ability to act as photooxidants, along with their pronounced photostability, can benefit key advances in solar-energy science and engineering.

Funder

National Science Foundation

American Chemical Society

National Institutes of Health

Fulbright Program - Brazil

National Council for Scientific and Technological Development

Publisher

MDPI AG

Subject

General Earth and Planetary Sciences,General Environmental Science

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