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Related Concept Videos

Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

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Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Transducer Mechanism: Enzyme-Linked Receptors

Enzyme-linked receptors are cell-surface receptors acting as an enzyme or associating with an enzyme intracellularly. They make excellent drug targets. Drugs can bind to the extracellular ligand-binding domain or directly affect their enzymatic domain and alter their activity.
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F&#246;rster Resonance Energy Transfer Mapping: A New Methodology to Elucidate Global Structural Features
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Tuning energy transfer in switchable donor-acceptor systems.

Johannes H Hurenkamp1, Jaap J D de Jong, Wesley R Browne

  • 1Stratingh Institute for Chemistry and Zernike Institute for Advanced Materials, Faculty of Mathematics and Natural Sciences, University of Groningen, Nijenborgh 4, 9747AG Groningen, The Netherlands.

Organic & Biomolecular Chemistry
|March 26, 2008
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Summary

Researchers synthesized novel photochromic triads, demonstrating reversible energy transfer modulation. These systems show potential for light-responsive materials, with efficient quenching and restoration of fluorescence observed.

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Area of Science:

  • Organic Chemistry
  • Photochemistry
  • Materials Science

Background:

  • Photochromic molecules offer tunable optical properties.
  • Energy transfer processes are crucial for optoelectronic devices.
  • Developing stimuli-responsive molecular systems is an active research area.

Purpose of the Study:

  • To synthesize and characterize novel coumarin-dithienylcyclopentene-coumarin (CSC) and perylene bisimide-dithienylcyclopentene-coumarin (PSC) triads.
  • To investigate the photochromic behavior and energy transfer dynamics within these triads.
  • To evaluate the reversibility and efficiency of light-induced modulation of energy transfer.

Main Methods:

  • Synthesis of symmetric (CSC) and asymmetric (PSC) triads.
  • Characterization using spectroscopic techniques (fluorescence, UV-Vis).
  • Photochromic switching studies of the dithienylcyclopentene unit.

Main Results:

  • Both CSC and PSC triads retain the photochromic switching function.
  • Efficient energy transfer quenching of coumarin fluorescence in CSC upon dithienylcyclopentene ring-closure (50% quenching).
  • Reversible modulation of energy transfer in PSC, with quenching of perylene bisimide emission in the closed state due to competitive and partial quenching.

Conclusions:

  • The synthesized triads exhibit efficient and reversible photo-induced energy transfer modulation.
  • The dithienylcyclopentene unit acts as a controllable switch for energy transfer pathways.
  • These systems demonstrate potential for applications in switchable optical materials and sensors.