Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Single Crystals as Reaction Vessels

02.09.2008
In a crystal, but like in solution: chemical reactions in the pores of single crystals

Japanese researchers from the University of Tokyo have made a complex that crystallizes as a porous solid.

Common reagents, even bulky ones, can easily diffuse into these pores and are sufficiently mobile to react with embedded substrates. As they report in the journal Angewandte Chemie, the pores act as a sort of crystalline molecular test tube.

The reaction products can then be directly examined by X-ray crystallographic methods.

Only single crystals can be examined by X-ray crystallography. The crystal’s diffraction of X-rays can be used to determine its structure. Liquids are not so easy to analyze. In solid-state reactions, this technique is limited to cases in which the structural changes are very small. Bulky reactants cannot even get into an ordinary tightly packed crystal, and crystals often decompose in the course of the reaction.

A team led by Makoto Fujita has developed a complex of zinc ions and aromatic ring systems that crystallizes into a robust network with large pores. The compound is constructed so that reactive groups of atoms, such as amino groups, protrude into the pores. Dipping the crystals into a solution containing common reactants brings these into contact with the embedded reaction partners. Even bulky molecules can get into the large pores. The researchers were thus able to react the amino groups with acetic anhydride or aniline. The reactivity of the reagents used and the course of the reaction are no different than if the reactants encountered each other freely in solution. The crystal changed color little by little, but remained intact in crystalline form despite the reaction.

Because the final product of the reaction is still in the form of a single crystal, the course of the reaction can be followed by X-ray crystallographic methods. Labile reaction products and intermediates can thus be produced and detected in situ. The chemical reactions within the pores can also be used to modify the walls of the pores as needed. For example, they can be equipped with free acid groups.

Author: Makoto Fujita, University of Tokyo (Japan), http://fujitalab.t.u-tokyo.ac.jp/members_e/mfujita/

Title: Single-Crystalline Molecular Flasks: Chemical Transformation with Bulky Reagents in the Pores of Porous Coordination Networks

Angewandte Chemie International Edition, doi: 10.1002/anie.200802545

Makoto Fujita | Angewandte Chemie
Further information:
http://pressroom.angewandte.org
http://fujitalab.t.u-tokyo.ac.jp/members_e/mfujita/

More articles from Life Sciences:

nachricht New application for acoustics helps estimate marine life populations
16.01.2018 | University of California - San Diego

nachricht Unexpected environmental source of methane discovered
16.01.2018 | University of Washington Health Sciences/UW Medicine

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Scientists decipher key principle behind reaction of metalloenzymes

So-called pre-distorted states accelerate photochemical reactions too

What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...

Im Focus: The first precise measurement of a single molecule's effective charge

For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.

Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...

Im Focus: Paradigm shift in Paris: Encouraging an holistic view of laser machining

At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.

No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...

Im Focus: Room-temperature multiferroic thin films and their properties

Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.

Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...

Im Focus: A thermometer for the oceans

Measurement of noble gases in Antarctic ice cores

The oceans are the largest global heat reservoir. As a result of man-made global warming, the temperature in the global climate system increases; around 90% of...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

10th International Symposium: “Advanced Battery Power – Kraftwerk Batterie” Münster, 10-11 April 2018

08.01.2018 | Event News

See, understand and experience the work of the future

11.12.2017 | Event News

Innovative strategies to tackle parasitic worms

08.12.2017 | Event News

 
Latest News

White graphene makes ceramics multifunctional

16.01.2018 | Materials Sciences

Breaking bad metals with neutrons

16.01.2018 | Materials Sciences

ISFH-CalTeC is “designated test centre” for the confirmation of solar cell world records

16.01.2018 | Power and Electrical Engineering

VideoLinks
B2B-VideoLinks
More VideoLinks >>>