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Photochemical Electrocyclic Reactions: Stereochemistry01:26

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles
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DNA-Based Assemblies for Photochemical Upconversion.

Saymore Mutsamwira1, Eric W Ainscough1, Ashton C Partridge1,2

  • 1Institute of Fundamental Sciences, Massey University , Private Bag 11-222, Palmerston North 4442, New Zealand.

The Journal of Physical Chemistry. B
|October 13, 2015
PubMed
Summary
This summary is machine-generated.

DNA scaffolds enable efficient photochemical upconversion (PUC) by organizing organic chromophores. This DNA-based system significantly lowers the required chromophore concentrations for green-to-blue light conversion, paving the way for advanced light-harvesting applications.

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Area of Science:

  • Supramolecular chemistry
  • Photochemistry
  • Biomaterials

Background:

  • Photochemical upconversion (PUC) converts low-energy photons to higher-energy ones.
  • Organic chromophores like ruthenium complexes and pyrene derivatives are key to PUC.
  • DNA's self-assembly properties offer potential for organizing chromophores.

Purpose of the Study:

  • To utilize DNA as a scaffold for supramolecular assembly of chromophores for PUC.
  • To investigate the interaction between DNA-bound chromophores and free chromophores.
  • To enhance the efficiency of green-to-blue PUC using DNA-templated chromophore organization.

Main Methods:

  • Synthesis of DNA duplexes functionalized with TINA monomers.
  • Complexation of DNA-TINA constructs with tris(2,2'-bipyridine)ruthenium(II).
  • Spectroscopic characterization using fluorescence, circular dichroism (CD), and UV-vis.

Main Results:

  • Ground-state complex formation observed between ruthenium complexes and TINA-modified DNA duplexes.
  • Significantly lower concentrations required for PUC in DNA-based systems compared to free chromophores.
  • Demonstrated efficient green-to-blue PUC at 2.5 μM [Ru(bpy)3](2+) and 5.0 μM TINA-modified duplex.

Conclusions:

  • DNA provides a versatile platform for controllable chromophore organization in photonic systems.
  • DNA-scaffolded PUC offers a more efficient and concentration-tolerant approach.
  • Opens new avenues for DNA-based light-harvesting and PUC technologies.