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Related Concept Videos

Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Range00:59

Range

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The range is one of the measures of variation. It can be defined as the difference between a dataset's highest and lowest values. For example, in the study of seven 16-ounce soda cans, the filled volume of soda was measured, thus producing the following amount (in ounces) of soda:
15.9; 16.1; 15.2; 14.8; 15.8; 15.9; 16.0; 15.5
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Electron Transport Chains01:28

Electron Transport Chains

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The final stage of cellular respiration is oxidative phosphorylation that consists of two steps: the electron transport chain and chemiosmosis. The electron transport chain is a set of proteins found in the inner mitochondrial membrane in eukaryotic cells. Its primary function is to establish a proton gradient that can be used during chemiosmosis to produce ATP and generate electron carriers, such as NAD+ and FAD, that are used in glycolysis and the citric acid cycle.
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Electron Carriers01:24

Electron Carriers

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Electron carriers can be thought of as electron shuttles. These compounds can easily accept electrons (i.e., be reduced) or lose them (i.e., be oxidized). They play an essential role in energy production because cellular respiration is contingent on the flow of electrons.
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Electron Affinity03:07

Electron Affinity

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The electron affinity (EA) is the energy change for adding an electron to a gaseous atom to form an anion (negative ion).
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¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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Related Experiment Video

Updated: Feb 9, 2026

Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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Efficient long-range electron transfer processes in polyfluorene-perylene diimide blends.

Anna Isakova1, Safakath Karuthedath, Thomas Arnold

  • 1Madrid Institute for Advanced Studies, IMDEA Nanoscience, Calle Faraday 9, Campus Cantoblanco, 28049 Madrid, Spain. larry.luer@imdea.org.

Nanoscale
|June 1, 2018
PubMed
Summary
This summary is machine-generated.

This study reveals long-range charge transfer in PDI:PFO blends, achieving high photovoltaic yields by avoiding recombination. This enables efficient exciton dissociation and near-unity charge separation for optimized organic solar cells.

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Area of Science:

  • Organic electronics
  • Photovoltaics
  • Materials science

Background:

  • Bulk heterojunction (BHJ) organic solar cells require efficient charge separation to overcome geminate recombination.
  • Long-range electron transfer mechanisms have been proposed but lack detailed quantification due to limited optical probes.
  • Interfacial charge transfer (CT) states can be strongly bound, hindering charge separation.

Purpose of the Study:

  • To investigate long-range charge transfer processes in a PDI:PFO blend using advanced spectroscopic techniques.
  • To quantify excitation dynamics and charge separation mechanisms at the donor-acceptor interface.
  • To demonstrate a strategy for designing BHJ blends with high charge separation yields.

Main Methods:

  • Femtosecond transient absorption spectroscopy was employed.
  • A unique intercalated phase of perylene diimide (PDI) crystals and polyfluorene (PFO) was studied.
  • Spectral features of excited states at the donor-acceptor interface were analyzed.

Main Results:

  • PDI excitons exhibited symmetry-breaking charge separation within hundreds of femtoseconds, outcompeting excimer formation.
  • PFO excitons dissociated via a one-step long-range process with high yields due to wavefunction delocalization.
  • Both PDI and PFO exciton dissociation circumvented the formation of strongly-bound interfacial CT states.

Conclusions:

  • Long-range charge transfer mechanisms are viable pathways for efficient charge separation in BHJ blends.
  • The PDI:PFO system demonstrates a model for achieving near-unity charge separation yields.
  • Targeted interfacial design can significantly enhance photovoltaic performance by controlling charge transfer dynamics.