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Tuning the Acceptor Unit of Push–Pull Porphyrazines for Dye-Sensitized Solar Cells

Authors: Medina, Diana-Paola; Fernández-Ariza, Javier; Urbani, Maxence; Sauvage, Frédéric; Torres, Tomás; Rodríguez-Morgade, M. Salomé;

Tuning the Acceptor Unit of Push–Pull Porphyrazines for Dye-Sensitized Solar Cells

Abstract

A family of four push–pull porphyrazines of A3B type, where each unit A contains two peripheral propyl chains and the unit B is endowed with a carboxylic acid, were prepared. The carboxylic acid was attached to the β-position of the pyrrolic unit, either directly (Pz 10), or through cyanovinyl (Pz 11) and phenyl (Pz 7) groups. The fourth Pz (14) consisted in a pyrazinoporphyrazine wherein the dinitrogenated heterocycle provided intrinsic donor–acceptor character to the macrocycle and contained a carboxyphenyl substituent. The direct attachment of the carboxylic acid functions and their linkers to the porphyrazine core produces stronger perturbation on the electronic properties of the macrocycle, with respect to their connection through fused benzene or pyrazine rings in TT112 and 14, respectively. The HOMO and LUMO energies of the Pzs, which were estimated with DFT calculations, show little variation within the series, except upon introduction of the cyanovinyl spacer, which produces a decrease in both frontier orbital energetic levels. This effective interaction of cyanovinyl substitution with the macrocycle is also evidenced in UV/Vis spectroscopy, where a large splitting of the Q-band indicates strong desymmetrization of the Pz. The performance of the four Pzs as photosensitizers in DSSCs were also investigated.

Countries
Spain, France, Spain
Keywords

porphyrazines, Organic chemistry, [CHIM.COOR] Chemical Sciences/Coordination chemistry, 540, Article, photovoltaics, QD241-441, amphiphilic systems, push–pull systems, [CHIM.COOR]Chemical Sciences/Coordination chemistry, dye-sensitized solar cells

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citations
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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