News News
Contact us
  • Customer service number:64321087
  • Commercial service telephone:13918059423
  • Technical service telephone:13918059423
  • Contact person: Mr. Cui 
  • Service
  • Address: room 107, building 8, no. 100, guilin road, xuhui district, Shanghai

Blue LEDs activate copper-based catalyst for more sustainable photochemical reactions

The date of: 2022-01-28
viewed: 0

 group of researchers at Hokkaido University’s Institute for Chemical Reaction Design and Discovery in Japan combined blue light-emitting diodes (LEDs) with a copper-based molecular catalyst to create a more sustainable way to make chemical subunits (single molecules that assemble with others to form a complex)—with potential applications in pharmaceutical and photoelectronic development.
The blue LED and copper-based molecular catalyst combo generates a cross-coupling reaction, in which two molecules are joined via a carbon-carbon bond. It’s a widely used type of reaction essential for creating the majority of chemical products today.
Using copper, which is a cheap and commonly available metal, as the catalyst for the cross-coupling reaction is a big deal for sustainability because precious metals like palladium tend to be used today for these reactions.
“The key basic concept here is the direct photoexcitation of a copper catalyst,” says Masaya Sawamura, a chemistry professor. “Conventional photochemical reactions require the use of harmful ultraviolet (UV) light or expensive precious metal catalysts to help with light absorption. The method we’ve developed is innovative in that the inexpensive copper catalyst directly absorbs visible light, which promotes the chemical reaction directly.”
Surprisingly, he adds, it turned out that this reaction involves two photochemical processes within a single catalytic chemical reaction. “One is the known photochemical process that converts the starting organic molecule into another molecule, which is activated by a ground-state copper catalyst,” explains Sawamura. “The other was an unexpected photoexcitation of the resulting catalytic organocopper intermediate. This two-step photochemical reaction enables an unprecedented molecular transformation.”
The group’s theoretical calculations show that the blue light exposure causes electrons to move from the metal copper atom to a connected subunit of the molecular catalyst. This excited state has separated electrical charges, they report, which makes the catalyst much more reactive. And they were able to use it to carry out a cross-coupling reaction to create an acyl group, which are useful for the synthesis of pharmaceuticals and photoelectronic materials.
Since copper within the molecular catalyst itself absorbs the blue light, rather than requiring a separate light-absorbing compound in addition to the catalyst, there are fewer moving parts. This makes the synthesis cheaper and simpler to perform and control.
Both blue LEDs and the copper catalyst are readily available, Sawamura points out, so this reaction is applicable to sustainable synthesis of pharmaceuticals and other products. “We hope our research will stimulate an innovative development of synthetic organic chemistry, which has largely relied on precious resources,” he says.
The group is now working on developing new reactions based on photoexcitation of copper catalysts. “New exciting findings have already been obtained and will be reported in the near future,” Sawamura says.

Hot News / Related to recommend
  • 2023 - 09 - 28
    Click on the number of times: 0
    source:ScienceNewsExploresA rare earth element is one of 17 elements on the periodic table. These 17 metals include 15 “lanthanides.” Those are elements 57 to 71. Scandium (element 21) and yttrium (el...
  • 2023 - 09 - 26
    Click on the number of times: 0
    source:SASKTODAYREGINA — Immigration and Career Training and Trade and Export Development Minister Jeremy Harrison, is leading a delegation to the United Kingdom (UK) and Poland.The mission's focu...
  • 2023 - 09 - 25
    Click on the number of times: 0
    source:malaymailKUALA LUMPUR, Sept 21 — A member of the Dewan Negara suggested today that the government set up an agency, body or government-linked company (GLC) to supervise and manage all rare eart...
  • 2023 - 09 - 22
    Click on the number of times: 1
    source:subscribeOD6 Metals looks set to turbocharge the hulking resource at its Splinter Rock project in Esperance after revealing new rare earths assays with grades of up to 4159 parts per million to...
  • Copyright ©Copyright 2018 2020 Shanghai rare earth association All Rights Reserved Shanghai ICP NO.2020034223
    the host:Shanghai Association of Rare Earth the guide:Shanghai Development and Application Office of Rare Earth the organizer:Shanghai rare earth industry promotion center