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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
Photoelectric Effect02:26

Photoelectric Effect

When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
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
Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
Fluorescence and Phosphorescence: Instrumentation01:25

Fluorescence and Phosphorescence: Instrumentation

Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.
The Photochemical Reaction Center01:29

The Photochemical Reaction Center

Reaction centers are pigment-protein complexes that initiate energy conversion from photons to chemical entities. Therefore, photochemical reaction center is a more appropriate term that describes these complexes. The Nobel laureates Robert Emerson and William Arnold provided the first experimental evidence of photochemical reaction centers by demonstrating the participation of nearly 2,500 chlorophyll molecules for the release of just one molecule of oxygen. Despite thousands of photosynthetic...

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An Introduction to Processing, Fitting, and Interpreting Transient Absorption Data
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Flow photochemistry: Old light through new windows.

Jonathan P Knowles1, Luke D Elliott, Kevin I Booker-Milburn

  • 1School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK.

Beilstein Journal of Organic Chemistry
|December 5, 2012
PubMed
Summary
This summary is machine-generated.

Flow photochemistry offers a powerful alternative to traditional batch reactors for organic synthesis. This review compares different flow reactor designs, highlighting their potential for wider adoption in synthetic chemistry.

Keywords:
cycloadditionflow chemistryphotocatalysisphotochemistryphotooxygenation

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Area of Science:

  • Synthetic organic chemistry
  • Photochemistry
  • Chemical engineering

Background:

  • Synthetic photochemistry, a potent tool in organic synthesis, has been historically underutilized in batch reactors.
  • Recent advancements in flow chemistry present an opportunity to broaden the application of photochemistry.
  • Flow reactors offer enhanced control and efficiency compared to traditional batch methods.

Purpose of the Study:

  • To review the application of flow reactors in synthetic photochemistry.
  • To compare different types of flow reactors used for photochemical reactions.
  • To highlight the potential of flow photochemistry for mainstream organic synthesis.

Main Methods:

  • Literature review of flow photochemistry techniques.
  • Comparative analysis of various flow reactor designs.
  • Discussion of advantages and limitations of flow reactors in photochemistry.

Main Results:

  • Flow photochemistry enables precise control over reaction parameters like temperature and irradiation time.
  • Different flow reactor configurations (e.g., microreactors, packed-bed reactors) offer distinct advantages for specific photochemical transformations.
  • Flow systems can improve safety and scalability for photochemical synthesis.

Conclusions:

  • Flow reactors represent a significant advancement for synthetic photochemistry.
  • The adoption of flow photochemistry can lead to more efficient, scalable, and safer organic synthesis.
  • Further development and application of flow reactor technology are expected to increase its mainstream use.