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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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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Mesostructured molecular solid material |Co(en)(3)|(Zr(2)F(11)H(2)O) with enhanced photoelectronic effect.

Yu Du1, Jihong Yu, Yuan Chen

  • 1School of Chemical and Biomedical Engineering, Nanyang Technological University, 637459 Singapore, Singapore.

Dalton Transactions (Cambridge, England : 2003)
|August 20, 2009
PubMed
Summary

Researchers synthesized a novel molecular solid, |Co(en)(3)|(Zr(2)F(11)H(2)O), with a mesostructured framework. This material significantly enhanced photoelectronic conversion due to increased optically active sites.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Photochemistry

Background:

  • Development of novel molecular solid materials with tailored properties is crucial for advanced applications.
  • Mesoporous materials offer enhanced surface area and accessibility, potentially improving photoelectronic performance.
  • Coordination compounds involving transition metals and zirconium fluoride clusters are of interest for their unique structures and properties.

Purpose of the Study:

  • To synthesize a novel molecular solid material containing cobalt(III) tris(ethylenediamine) and zirconium fluoride clusters.
  • To prepare this material with a mesostructured framework using a triblock co-polymer.
  • To investigate the photoelectronic properties of the mesostructured material and compare it to its bulk counterpart.

Main Methods:

  • Hydrothermal synthesis of the molecular solid |Co(en)(3)|(Zr(2)F(11)H(2)O).
  • Utilizing a triblock co-polymer P123 (poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide)) as a structure-directing agent under acidic conditions to achieve mesostructure.
  • Photoelectronic property measurements to evaluate performance.

Main Results:

  • Successful synthesis of the molecular solid |Co(en)(3)|(Zr(2)F(11)H(2)O) with a H-bonded assembly of [Zr(4)F(22)O(2)](10-) and [Co(en)(3)](3+) ions.
  • Demonstration of mesostructured framework formation using P123 as a structure-directing agent.
  • Significant enhancement of photoelectronic conversion in the mesostructured material compared to the bulk material.

Conclusions:

  • The mesostructured molecular solid |Co(en)(3)|(Zr(2)F(11)H(2)O) exhibits improved photoelectronic properties.
  • The enhanced performance is attributed to the increased density of accessible optically active sites in the mesostructured framework.
  • This study highlights the potential of using structure-directing agents for developing advanced functional molecular materials.