Dataset Information

Enhancement of Energy Transfer Efficiency with Structural Control of Multichromophore Light-Harvesting Assembly.

ABSTRACT: Multichromophore systems (MCSs) are envisioned as building blocks of molecular optoelectronic devices. While it is important to understand the characteristics of energy transfer in MCSs, the effect of multiple donors on energy transfer has not been understood completely, mainly due to the lack of a platform to investigate such an effect systematically. Here, a systematic study on how the number of donors (n D) and interchromophore distances affect the efficiency of energy transfer (? FRET) is presented. Specifically, ? FRET is calculated for a series of model MCSs using simulations, a series of multiporphyrin dendrimers with systematic variation of n D and interdonor distances is synthesized, and ? FRETs of those dendrimers using transient absorption spectroscopy are measured. The simulations predict ? FRET in the multiporphyrin dendrimers well. In particular, it is found that ? FRET is enhanced by donor-to-donor energy transfer only when structural heterogeneity exists in an MCS, and the relationships between the ? FRET enhancement and the structural parameters of the MCS are revealed.

SUBMITTER: Oh I

PROVIDER: S-EPMC7578888 | biostudies-literature | 2020 Oct

REPOSITORIES: biostudies-literature

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Enhancement of Energy Transfer Efficiency with Structural Control of Multichromophore Light-Harvesting Assembly.

Oh Inhwan I Lee Hosoowi H Kim Tae Wu TW Kim Chang Woo CW Jun Sunhong S Kim Changwon C Choi Eun Hyuk EH Rhee Young Min YM Kim Jeongho J Jang Woo-Dong WD Ihee Hyotcherl H

Advanced science (Weinheim, Baden-Wurttemberg, Germany) 20200819 20

Multichromophore systems (MCSs) are envisioned as building blocks of molecular optoelectronic devices. While it is important to understand the characteristics of energy transfer in MCSs, the effect of multiple donors on energy transfer has not been understood completely, mainly due to the lack of a platform to investigate such an effect systematically. Here, a systematic study on how the number of donors (<i>n</i> <sub>D</sub>) and interchromophore distances affect the efficiency of energy trans ...[more]

PMID: 33101863

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Project description:Periphyton communities of a boreal stream were exposed to different light and nutrient levels to estimate energy transfer efficiency from primary to secondary producers using labeling with inorganic (13)C. In a one-day field experiment, periphyton grown in fast-flow conditions and dominated by opportunistic green algae were exposed to light levels corresponding to sub-saturating (forest shade) and saturating (open stream section) irradiances, and to N and P nutrient additions. In a two-week laboratory experiment, periphyton grown in low-flow conditions and dominated by slowly growing diatoms were incubated under two sub-saturating light and nutrient enrichment levels as well as grazed and non-grazed conditions. Light had significant positive effect on (13)C uptake by periphyton. In the field experiment, P addition had a positive effect on (13)C uptake but only at sub-saturating light levels, whereas in the laboratory experiment nutrient additions had no effect on the periphyton biomass, (13)C uptake, biovolume and community composition. In the laboratory experiment, the grazer (caddisfly) effect on periphyton biomass specific (13)C uptake and nutrient content was much stronger than the effects of light and nutrients. In particular, grazers significantly reduced periphyton biomass and increased biomass specific (13)C uptake and C:nutrient ratios. The energy transfer efficiency, estimated as a ratio between (13)C uptake by caddisfly and periphyton, was positively affected by light conditions, whereas the nutrient effect was not significant. We suggest that the observed effects on energy transfer were related to the increased diet contribution of highly palatable green algae, stimulated by higher light levels. Also, high heterotrophic microbial activity under low light levels would facilitate energy loss through respiration and decrease overall trophic transfer efficiency. These findings suggest that even a small increase in light intensity could result in community-wide effects on periphyton in boreal streams, with a subsequent increase in energy transfer and system productivity.

Dataset Information

Enhancement of Energy Transfer Efficiency with Structural Control of Multichromophore Light-Harvesting Assembly.

Publications

Enhancement of Energy Transfer Efficiency with Structural Control of Multichromophore Light-Harvesting Assembly.

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