Capturing C60 in a Crystalline Copolymer Chain

Since its structural realisation in 1985, C60 has garnered much attention in the chemical world for not only its spherical shape, but also its stability, electronic properties and the ability to do chemistry on its surface.

One such avenue that has proven popular in recent times is the incorporation of C60 into one-, two- and three-dimensional arrays, either covalently or non-covalently, in attempts to control the distribution of the molecules in the solid- or solution-phase.  One problem that arises in the synthesis of these extended frameworks, however, is that there often a large amount of disorder and void space in the structure, so it can be difficult to ascertain with much degree of certainty how these C60 molecules are oriented. This uncertainty can consequentially result in the properties and behaviours of the new materials remaining unidentified.

Now, researchers from the University of California, DavisMarilyn Olmstead and Alan Balch – have shown that coordination chemistry can be used to not only generate polymers that covalently link molecules of functionalised C60 in such a manner that can they can be studied crystallographically, but also that these polymers can be used to capture free C60 and C70.

Initially, polymers of C60 were synthesised through the mono-functionalisation of C60 with a piperazyl group, which, on account of its two tertiary amines, can coordinate in a linear fashion with transition metal ions, in this case rhodium(II) acetate. Upon the combination of these two components, a linear one-dimensional polymer was formed, in which it could be seen crystallographically that the C60 moieties were positioned on alternating sides of the polymer chain. These polymer chains were further found to extend into two dimensions through the interdigitation of neighbouring chains in a zipper-like fashion. C60-Rh(II) polymers can capture free C60

Perhaps more interestingly is that when these polymer chains were synthesised in the presence of either C60 or C70, free molecules of C60 or C70 were seen to occupy the void spaces between the C60 molecules of the polymer. Additionally, if a mixture of C60 and C70 was present in the polymer synthesis, it was observed that only C60 was captured by the polymer, most likely as a result of a better geometric match between the polymer and the spherical C60 in preference to the more elongated shape of C70.

This work elegantly demonstrates the generation of not only a self-assembling C60-containing polymer that can be characterised structurally in the solid state, but of one  that can entrap free molecules of C60 selectively over molecules of C70. Based on the properties of free C60 and transition metal complexes, the electronic and chromophoric properties of such a crystalline system could also be expected to offer some noteworthy results.

Read this HOT ChemComm article in full!

Zipping up fullerenes into polymers using rhodium(II) acetate dimer and N(CH2CH2)2NC60 as building blocks
Amineh Aghabali, Marilyn M. Olmstead and Alan L. Balch
Chem. Commun., 2014, Advance Article.
DOI: 10.1039/C4CC06995A

Biography

Anthea Blackburn is a guest web writer for Chemical Communications. Anthea is a graduate student hailing from New Zealand, studying at Northwestern University in the US under the tutelage of Prof. Fraser Stoddart (a Scot), where she is exploiting supramolecular chemistry to develop multidimensional systems and study the emergent properties that arise in these superstructures. When time and money allow, she is ambitiously attempting to visit all 50 US states before graduation.

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ChemComm Associate Editor Jonathan Sessler to receive the 2014 MSMLG Award

ChemComm warmly congratulates Associate Editor Jonathan Sessler, who will receive the 2014 MSMLG Award at the 4th International Conference on Molecular Sensors and Molecular Logic Gates (MSMLG2014), to be held in Shanghai, China, from 9-12th November.

Professor Jonathan Sessler
Professor Sessler, of the University of Texas at Austin, is to be recognized for his seminal contributions to colorimetric anion, cation, and neutral substrate sensors, as well as for his work on calixpyrrole-based self-assembly and molecular logic device design.

Professor Seiji Shinkai
The MSMLG Award will also be presented to Professor Seiji ShinkaiChemComm sends sincere congratulations! Professor Shinkai, of Kyushu University, Japan, designed the first molecular machines and played an integral part in the development of various functional calixarenes.  We invite you to check out our recent cross-journal collection of articles – including a good number from ChemComm – especially published in celebration of Seiji Shinkai’s 70th Birthday.

MSMLG2014
The International Conference on Molecular Sensors and Molecular Logic Gates is a biennial conference organized by the East China University of Science and Technology (ECUST). Over 350 delegates from 25 countries are expected to attend. They will discuss innovative research and development in the fields of molecular sensors and molecular logic gates, molecular recognition and supramolecular self-assembly, and related research areas.

The Royal Society of Chemistry is a proud supporter of MSMLG 2014, sponsoring two poster prizes, the winners of which will each receive a hardbound copy of ‘Molecular Logic-based Computation’ from the RSC Books list.

For more information on the conference and to see the line-up of speakers, visit http://www.msmlg2014.org/.

Look out for ChemComm’s upcoming themed collection on Molecular Logic Gates and Information Processing in early 2015!

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Bubble power: Driving self-propelled machines with acetylene bubbles

Iain Larmour is a guest web writer for ChemSci. He has researched a wide variety of topics during his years in the lab including nanostructured surfaces for water repellency and developing nanoparticle systems for bioanalysis by surface enhanced optical spectroscopies. He currently works in science management. In his spare time he enjoys reading, photography, art and inventing.

Self-propelled micro/nanomachines were once the thing of science-fiction, but as so often is the case, fiction has become reality in recent years. Such devices could in the future find uses in environmental remediation and biomedical applications. Researchers around the world have been making progress on designing these machines, and it is a novel fuel-free autonomous self-propelled motor which is the focus of this Chemical Communication by Martin Pumera and team from the School of Physical and Mathematical Sciences at Nanyang Technological University.

Rather than focus on oxygen bubble propulsion, which often requires the use of high levels of toxic hydrogen peroxide, they have developed an acetylene bubble based motor. To achieve this they utilised the reaction of water and calcium carbide, which produces acetylene and calcium hydroxide. This approach makes use of the water that will be found in the most common application environments, but does not require reactive metals such as magnesium and aluminium. The work expands the scope of bubble-propulsion beyond hydrogen and oxygen and gives designers of micro/nanomachines greater power unit choices in their designs.

Acetylene bubble powered motor in water.

The most important part of the research reported in this Communication is the optimisation of an encapsulation layer around the calcium carbide to control the reaction. However, to find out what this layer is made of and how to prepare it you will have to read the article today.

To read the details, check out the Chem Comm article in full:

Acetylene bubble-powered autonomous capsules: towards in situ fuel
James Guo Sheng Moo, Hong Wang and Martin Pumera
Chem. Commun., 2014, 50, Advance Article
DOI: 10.1039/C4CC07218A
   

    

    

    

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ChemComm Emerging Investigator Lectureship 2015 – nominations open

Deadline for nominations: 8th December 2014 – nominate now!

We are delighted to invite nominations for ChemComm Emerging Investigator Lectureship 2015. The Lectureship, which is awarded annually, will recognise an emerging scientist in the early stages of their independent academic career.

To qualify
To be eligible for the ChemComm Emerging Investigator Lectureship, the candidate should have completed their PhD on or after 4th September 2006. The candidate should also have published at least one article in ChemComm during the course of their independent career.

Lectureship details
The recipient of the Lectureship will be invited to present a lecture at three different locations over a 12 month period. It is expected that at least one of the locations will be a conference. The recipient will receive a contribution of £1500 towards travel and accommodation costs. S/he will also be presented with a certificate and be asked to contribute a ChemComm Feature Article.

Nominations
Those wishing to make a nomination should send the following details to the ChemComm Editorial Office by Monday 8th December 2014:

  • Recommendation letter, including the name, contact details and website URL of the nominee.
  • A one page CV for the nominee, including their date of birth, summary of education and career, list of up to five independent publications, total numbers of publications and patents and other indicators of esteem and evidence of independence.
  • A copy of the candidate’s best publication to date (as judged by the nominator).
  • Two supporting letters of recommendation from two independent referees. These should not be someone from the same institution or the candidate’s post doc or PhD supervisor.

The nominator and independent referees are requested to comment on the candidate’s presenting skills.

Please note that self nomination is not permitted.

Selection procedure
The ChemComm Editorial Board will draw up a short-list of candidates based on the information provided by the referees and nominator. Short-listed candidates will be asked to provide a supporting statement justifying why they deserve the Lectureship. The recipients of the Lectureship will then be selected and endorsed by the ChemComm Editorial Board, and will be announced in Spring 2015.

Previous winners

2014 Xinliang Feng Xinliang Feng (Technische Universität Dresden, Germany) for advanced organic materials
2014 Tomislav Friscic Tomislav Friščić (McGill University, Canada) for organic chemistry
2014 Simon Humphrey Simon M. Humphrey (University of Texas, USA) for inorganic chemistry
2013 Louise A. Berben (University of California Davis, USA) for synthetic and physical inorganic chemistry
2013 Marina Kuimova (Imperial College London, UK) for biophysical chemistry
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Nominations open for the Cram Lehn Pedersen Prize in Supramolecular Chemistry 2015

Apply by 31st December 2014

Nominations are now open for the Cram Lehn Pedersen Prize in Supramolecular Chemistry. The prize, sponsored by ChemComm, is organised by the committee of the International Symposium on Macrocyclic and Supramolecular Chemistry and is awarded each year to a young supramolecular chemist.

The Cram Lehn Pedersen Prize is named in honour of the winners of the 1987 Nobel Prize in Chemistry and recognizes significant original and independent work in supramolecular chemistry. Previous winners include Oren Schermann, Tomoki Ogoshi, and Jonathan Nitschke.

The Prize
The winner will receive:

  • £2000
  • free registration for the ISMSC meeting in Strasbourg, France
  • the opportunity to give a lecture at the ISMSC as well as undertake a short lecture tour after the meeting, in consultation with the Editor of ChemComm

Eligibility
To be eligible for the award you must be within 10 years of receiving your PhD on 31st December 2014

Nomination Instructions
You may nominate yourself or someone else. Please send CV, list of publications (divided into publications from PhD and postdoc and publications from independent work), and, if desired, a letter of support to Prof. Roger Harrison (ISMSC Secretary) at rgharris@chem.byu.edu by 31st December 2014

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Just Mix – Zeolitic Imidazolate Framework Synthesis

Iain Larmour is a guest web writer for ChemSci. He has researched a wide variety of topics during his years in the lab including nanostructured surfaces for water repellency and developing nanoparticle systems for bioanalysis by surface enhanced optical spectroscopies. He currently works in science management. In his spare time he enjoys reading, photography, art and inventing.

Zeolitic-imidazolate frameworks (ZIFs) are a sub-class of metal-organic frameworks (MOFs) with a wide range of potential uses including: CO2 capture, storage, catalysis, sensing and biomedicine. Unfortunately their synthesis often requires additives or reaction activation, and if they can be made without these it often requires long reaction times or results in low yields, neither of which is ideal for a substance with such wide potential uses.

To overcome this bottleneck in ZIF synthesis, Roland Fischer and his team from the Inorganic Chemistry department in Ruhr Universitat Bochum in Germany have developed a rapid room temperature synthesis approach. I am a great believer in developing approaches that can be carried out at room temperature and pressure and this is one such elegant solution. The authors produce nanocrystals of ZIFs in a very narrow size distribution by careful selection of the precursors and the solvents they are dissolved in. The solutions are then mixed and stirred to create the ZIF crystals; it really is that elegant.

ZIF crystals showing very narrow size distribution

The authors then used these crystals to fabricate thin films on quartz crystal microbalances and used this device to detect volatile organic solvents. This demonstration leads the way into exploring other uses of these ZIFs – after all, they can now be easily made. But to find out which solvent and precursors you need to use, you’ll have to read the paper today!

To read the details, check out the ChemComm article in full:
Rapid room temperature synthesis of zeolitic-imidazolate framework (ZIF) nanocrystals
Min Tu, Christian Wiktor, Christoph Rosler and Roland Fischer
Chem. Commun., 2014, 50, 13258-13260
DOI: 10.1039/C4CC06491G  

    

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Ionic liquid-gas interfaces: more than a surface glance

Richard Massey writes about a hot ChemComm article for Chemistry World

Research by scientists in the UK suggests that small changes in the nature of binary ionic liquid systems can significantly alter their surface composition. The findings may aid the design of ionic liquid films for applications such as gas capture and supported catalysis, where surface adsorption is essential.

Studies on simple one-cation–one-anion mixtures have previously revealed that the outer layers contain a greater concentration of alkyl chains than in the bulk…


Read the full article in Chemistry World»

Read the original journal article in ChemComm – it’s free to access until 20 November:
Fine tuning the ionic liquid–vacuum outer atomic surface using ion mixtures
Ignacio J. Villar-Garcia, Sarah Fearn, Nur L. Ismail, Alastair J. S. McIntosh and Kevin R. J. Lovelock  
DOI: 10.1039/C4CC06307D

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FBNCO: all the 2p-block elements in one molecule

Jennifer Newton writes about a hot ChemComm article for Chemistry World

Scientists in Italy have made a molecule with one of each of the 2p-block elements. Well, almost. There’s no neon in FBNCO but it would be a bit unfair to expect them to include an element with no known chemistry.

Read the full article in Chemistry World»

You can read the original journal article in ChemComm - it’s free to access until 17th November 2014:
All the 2p-block elements in a molecule: experimental and theoretical studies of FBNCO and FBNCO+
Anna Troiani, Stefania Garzoli, Federico Pepi, Andreina Ricci, Marzio Rosi, Chiara Salvitti and Giulia de Petris  
DOI: 10.1039/C4CC05217J

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Hot ChemComm articles for October

All of the referee-recommended articles below are free to access until 9th November 2014

Relay cooperation of K2S2O8 and O2 in oxytrifluoromethylation of alkenes using CF3SO2Na
Qingquan Lu, Chao Liu, Zhiyuan Huang, Yiyang Ma, Jian Zhang and Aiwen Lei  
Chem. Commun., 2014, Advance Article
DOI: 10.1039/C4CC06328G, Communication

C4CC06328G GA


All the 2p-block elements in a molecule: experimental and theoretical studies of FBNCO and FBNCO+
Anna Troiani, Stefania Garzoli, Federico Pepi, Andreina Ricci, Marzio Rosi, Chiara Salvitti and Giulia de Petris  
Chem. Commun., 2014, Advance Article
DOI: 10.1039/C4CC05217J, Communication

C4CC05217J GA


Hierarchical porous metal–organic framework monoliths
Adham Ahmed, Mark Forster, Rob Clowes, Peter Myers and Haifei Zhang  
Chem. Commun., 2014, Advance Article
DOI: 10.1039/C4CC06967F, Communication

C4CC06967F GA


Live cell off-target identification of lapatinib using ligand-directed tosyl chemistry
Kei Yamaura, Keiko Kuwata, Tomonori Tamura, Yoshiyuki Kioi, Yousuke Takaoka, Shigeki Kiyonaka and Itaru Hamachi  
Chem. Commun., 2014, Advance Article
DOI: 10.1039/C4CC05885B, Communication

C4CC05885B GA


Organic nanoparticles with aggregation-induced emission for tracking bone marrow stromal cells in the rat ischemic stroke model
Kai Li, Mie Yamamoto, Su Jing Chan, Mun Yee Chiam, Wei Qin, Peter Tsun Hon Wong, Evelyn King Fai Yim, Ben Zhong Tang and Bin Liu  
Chem. Commun., 2014, Advance Article
DOI: 10.1039/C4CC06921H, Communication

C4CC06921H GA


The coaction of tonic and phasic dopamine dynamics
Christopher W. Atcherley, Kevin M. Wood, Kate L. Parent, Parastoo Hashemi and Michael L. Heien  
Chem. Commun., 2014, Advance Article
DOI: 10.1039/C4CC06165A, Communication

C4CC06165A GA

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Assessing covalency in the hydrogen bond zoo

Jennifer Newton writes about a hot ChemComm article for Chemistry World

Covalency, a term describing bonding by sharing electrons, divides opinion when mentioned alongside hydrogen bonding. Worried that the concept of hydrogen bonding has been getting fuzzier over time, scientists in Germany have sought a fresh look at the very nature of these bonds, and how much covalency they involve.

Richard Dronskowski and colleagues at RWTH Aachen University collected evidence from hydrogen-bonded molecular crystals to elucidate how these crystals are held together and compare the covalency of long and short hydrogen bonds.


Read the full article in Chemistry World»

Read the original journal article in ChemComm – it’s free to access until 13th November:
Covalency of hydrogen bonds in solids revisited
Volker L. Deringer, Ulli Englert and Richard Dronskowski  
Chem. Commun., 2014,50, 11547-11549, DOI: 10.1039/C4CC04716H

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