Author Archive

Cold-welding for gold

 

Large-scale fabrication of highly ordered gold nanochannel monolayers has been demonstrated by scientists in Japan. Yingpu Bi and Jinhua Ye fron the National Institute for Materials Science, in Tsukuba, have used the galvanic replacement reaction over aligned silver nanowire arrays, which can be employed as a simple and powerful cold-welding technique to make these gold nanochannels.

Why not read the article today and blog your thoughts below? Published in ChemComm, this communication is free to access until the 8th October.

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Copper uncovers truth behind cytotoxicity

Many human disorders are characterized by amyloid accumulation, in particular Alzheimer’s disease, type 2 diabetes mellitus and Parkinson’s disease. Research shows that copper enhances amyloid activity and mediates human islet amyloid polypeptide (hIAPP) oligomerization.

 

Yan-Mei Li and co-workers at the Tsinghua University, in China, have used copper (and nickel) to mimic these effects and it has helped shed some light on why we observe cytotoxicity for type 2 diabetes.

 

 

 

 

Curious to know more, why not download the article today and blog some comments below? Published in ChemComm, this article is free to access until the 8th October.

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Tinker, tailor, nanoparticle maker

Scientists in the US have described a new way of preparing gold nanoparticle superstructures with tailorable thicknesses, formed using a self-assembled gold-binding peptide conjugate template. Nathaniel Rosi and colleagues at the University of Pittsburgh, examined how the synthesis and assembly mechanism impacts the organization of the superstructures.

The article is free to access until the 8th of October, so why not download the article today and blog your thoughts and comments below?

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Unilever-RSC International Symposium in China announced

One country, three cities, three meetings – The Royal Society of Chemistry (RSC) and Unilever are coming to China.

This Symposium will feature three one day meetings that will take place at three different locations throughout China. Each one day meeting will feature a selection of lectures covering the properties and applications of many different materials given by some of the world’s leading international scientists. The symposium is supported by Unilever and has been organised by them, the RSC, as well as the three host universities.

The three symposia will take place at the following:-

*  Monday 8th November – Symposium at University of Chemical Technology (BUCT), Beijing, hosted by  Professor Wantai Yang 
* Wednesday 10th November – Symposium at Zhejiang University, Hangzhou, hosted by Professor Bogeng Li 
* Thursday 11th November – Symposium at East China University of Science and Technology (ECUST),  Shanghai, hosted by Professor He Tian 

 

Attendance at any of the three one day meetings is free although delegates are asked to register; The symposium will appeal to academic and industrial scientists with an interest in functional materials science. Student participation is also strongly encouraged and each symposium will offer students the opportunity to present their work during a poster session.

For more information on this symposium, or to see the list of speakers or to register your attendance please visit the website for more details.

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Transfer agents & catalysis for N-Heterocyclic carbenes

Used by many researchers in catalysis, N-Heterocyclic carbenes (NHC) can play a variety of roles in chemistry. Last month, Catherine Cazin and her co-workers at the University of St Andrews have published two articles in ChemComm, showing that their NHC complexes can be successfully used as either transfer agents or for efficiently catalysing ring closing metathesis (RCM) reactions.

The first article reports a way to easily prepare inexpensive copper synthons as NHC transfer agents to generate catalytically active gold and palladium complexes. It is the first example showing the transfer of NHC ligand from one metal centre to another. Furthermore, the resulting gold and palladium complexes are ones that are frequently used in transition metal-mediated catalysis.

The second article reports how a ruthenium-based metathesis catalyst fluctuates between trans- and cis-isomer upon heating. It is the first example of an indenylidene complex bearing monodentate (NHC and phosphite) ligands that exhibit cis-configuration.  The catalytic studies also showed that these systems are able to efficiently promote RCM reactions using very low loading levels and seem to last longer than other pre-catalysts currently used.

Both these papers are free to access until the 8th of October, so why not click on the links above, download and read the articles today!

Please feel free to blog any thoughts or comments below too!

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Small bilirubin adsorbents

Millimetre-sized mesoporous carbon spheres (MMCSs) with smooth surfaces and penetrating mesoporous channels have been successfully prepared using an emulsion-EISA technique. Jianlin Shi and fellow scientists in Shanghai, China have found them to be much better bilirubin adsorbents than activated carbon spheres that are commercially available . Hemolysis and coagulation assays of MMCSs show that they have negligible hemolysis effect and do not induce blood coagulation, which means that they may be very promising for applications in practical blood perfusion.

Fancy reading more? Why not read the article here, published in ChemComm, it is free to access until the end of September or comment on the post below.

 

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MRI dual imaging success

Manganese oxide nanoparticles with a hydrophilic coating show promise as a contrast agent for Magnetic Resonance Imaging (MRI) due to the nanoparticles efficient water-surface interaction resulting in prominent T1 contrast.  

 

Xiaoyuan Chen, at Stanford University, in the US and colleagues in China, have carried out a proof-of-concept study, where they’ve coupled the nanoparticles with 64Cu radioisotope and performed PET/MRI dual imaging in a U87MG xenograft model. It showed good tumor accumulation for both imaging modalities.

 
Fancy reading more? Then why not read the communication here, which is free to access until the end of September or comment on the post below.
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Fluorosugars – tag you’re it!

A tag-and-modify strategy has been developed that allows the practical synthesis of homogenous fluorinated glyco-amino acids, peptides and proteins carrying a fluorine label in the sugar, allowing access to the first set of examples of directly radiolabelled ([18F]-glyco)proteins.

Benjamin G. Davis and co-workers at the University of Oxford, in the UK, have published their findings in ChemComm, where the article is free to access until the end of September. So why not download the communication today and blog any thoughts and comments below.

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Getting tough with Teflon

Scientists report a new methodology for surface modification of Teflon. The ease and efficiency of this approach and its rather robust character offer a number of interesting future perspectives.

 
Jean-Marc Vincent and his colleagues at the University Bordeaux, in France, have modified the Teflon membranes with a fluorophilic copper(II)-carboxylate complex. They believe that this may prove very useful towards developing passive samplers for the detection of contaminants of aquatic ecosystems, such as pharmaceutical compounds. The recycling of catalysts (modified by pyridyl tags or other groups that can bind to copper) and the purification of histidyl-tagged proteins are other examples of potential applications.
 
 
 

Interested to know more? Why not download and read the article today! It’s recently been published in ChemComm and will be freely available to all, until the end of September.

Fancy submitting your own exciting, high quality research to ChemComm? Then why not email us your suggestions or upload your submission via our website.

 

 

 

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A pinch of salt

A novel chiral triazolium salt (derived from N-heterocyclic carbene) has shown to be a potent catalyst precursor for the asymmetric cross-benzoin reaction of aldehydes with ketones. Dieter Enders and his colleagues at RWTH Aachen University, in Germany have shown that several heteroaromatic aldehydes can react successfully with various aromatic trifluoroketones in good to excellent yields, with moderate to good enantioselectivities. This could be improved (up to 99% ee) by recrystallisation.

Direct observation of the reaction by NMR along with racemisation experiments showed that the product is formed under kinetic control.

Fancy reading more? Why not download and read Dieter Enders communication today! Its recently been published in ChemComm and will be free to access until the end of September.

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