Dataset Information

Efficient Sunlight Harvesting by A₄ ?-Pyrrolic Substituted Zn^II Porphyrins: A Mini-Review.

ABSTRACT: Dye-Sensitized Solar Cells (DSSCs) are a highly promising alternative to conventional photovoltaic silicon-based devices, due to the potential low cost and the interesting conversion efficiencies. A key-role is played by the dye, and porphyrin sensitizers have drawn great interest because of their excellent light harvesting properties mimicking photosynthesis. Indeed, porphyrins are characterized by strong electronic absorption bands in the visible region up to the near infrared and by long-lived ?^* singlet excited states. Moreover, the presence of four meso and eight ?-pyrrolic positions allows a fine tuning of their photoelectrochemical properties through structural modification. Trans-A₂BC push-pull Zn^II porphyrins, characterized by a strong and directional electron excitation process along the push-pull system, have been extensively investigated. On the other hand, A₄ ?-pyrrolic substituted tetraaryl Zn^II porphyrins, which incorporate a tetraaryl porphyrinic core as a starting material, have received lower attention, even if they are synthetically more attractive and show several advantages such as a more sterically hindered architecture and enhanced solubility in most common organic solvents. The present contribution intends to review the most prominent A₄ ?-substituted Zn^II porphyrins reported in the literature so far for application in DSSCs, focusing on the strategies employed to enhance the light harvesting capability of the dye and on a comparison with meso-substituted analogs.

SUBMITTER: Di Carlo G

PROVIDER: S-EPMC6470396 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature

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Efficient Sunlight Harvesting by A<sub>4</sub> β-Pyrrolic Substituted Zn<sup>II</sup> Porphyrins: A Mini-Review.

Di Carlo Gabriele G Orbelli Biroli Alessio A Pizzotti Maddalena M Tessore Francesca F

Frontiers in chemistry 20190411

Dye-Sensitized Solar Cells (DSSCs) are a highly promising alternative to conventional photovoltaic silicon-based devices, due to the potential low cost and the interesting conversion efficiencies. A key-role is played by the dye, and porphyrin sensitizers have drawn great interest because of their excellent light harvesting properties mimicking photosynthesis. Indeed, porphyrins are characterized by strong electronic absorption bands in the visible region up to the near infrared and by long-live ...[more]

PMID: 31032244

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Project description:BackgroundIn northwest of China, mini Chinese cabbage (Brassica pekinensis) is highly valued by consumers, and is widely cultivated during winter in solar-greenhouses where low light (LL) fluence (between 85 and 150 μmol m-2 s-1 in day) is a major abiotic stress factor limiting plant growth and crop productivity. The mechanisms with which various NH4+: NO3- ratios affected growth and photosynthesis of mini Chinese cabbage under normal (200 μmol m-2 s-1) and low (100 μmol m-2 s-1) light conditions was investigated. The four solutions with different ratios of NH4+: NO3- applied were 0:100, 10:90, 15:85 and 25:75 with the set up in a glasshouse in hydroponic culture. The most appropriate NH4+: NO3- ratio that improved the tolerance of mini Chinese cabbage seedlings to LL was found in our current study.ResultsUnder low light, the application of NH4+: NO3- (10:90) significantly stimulated growth compared to only NO3- by increasing leaf area, canopy spread, biomass accumulation, and net photosynthetic rate. The increase in net photosynthetic rate was associated with an increase in: 1) maximum and effective quantum yield of PSII; 2) activities of Calvin cycle enzymes; and 3) levels of mRNA relative expression of several genes involved in Calvin cycle. In addition, glucose, fructose, sucrose, starch and total carbohydrate, which are the products of CO2 assimilation, accumulated most in the cabbage leaves that were supplied with NH4+: NO3- (10:90) under LL condition. Low light reduced the carbohydrate: nitrogen (C: N) ratio while the application of NH4+: NO3- (10:90) alleviated the negative effect of LL on C: N ratio mainly by increasing total carbohydrate contents.ConclusionsThe application of NH4+:NO3- (10:90) increased rbcL, rbcS, FBA, FBPase and TK expression and/or activities, enhanced photosynthesis, carbohydrate accumulation and improved the tolerance of mini Chinese cabbage seedlings to LL. The results of this study would provide theoretical basis and technical guidance for mini Chinese cabbage production. In practical production, the ratio of NH4+:NO3- should be adjusted with respect to light fluence for successful growing of mini Chinese cabbage.

Dataset Information

Efficient Sunlight Harvesting by A₄ ?-Pyrrolic Substituted Zn^II Porphyrins: A Mini-Review.

Publications

Efficient Sunlight Harvesting by A<sub>4</sub> β-Pyrrolic Substituted Zn<sup>II</sup> Porphyrins: A Mini-Review.

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Dataset Information

Efficient Sunlight Harvesting by A4 ?-Pyrrolic Substituted ZnII Porphyrins: A Mini-Review.

Publications

Efficient Sunlight Harvesting by A<sub>4</sub> β-Pyrrolic Substituted Zn<sup>II</sup> Porphyrins: A Mini-Review.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets

Efficient Sunlight Harvesting by A₄ ?-Pyrrolic Substituted Zn^II Porphyrins: A Mini-Review.