Chemical Science Blog

First efficient catalyst to synthesise hindered heterobiaryls by direct C–H coupling

28 Mar 2012

Scientists in Japan and Germany have made the first efficient catalyst to enable the synthesis of hindered heterobiaryls by direct C–H coupling. Hindered biaryls have numerous applications such as catalysts/ligands for asymmetric synthesis and chiral materials, and are often found in biologically active natural products.

Link to journal article
Hindered Biaryls by C-H Coupling: Bisoxazoline-Pd Catalysis Leading to Enantioselective C-H Coupling
K Yamaguchi et al
Chem. Sci., 2012, DOI: 10.1039/c2sc20277h

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First coordination polymer-based devices

28 Mar 2012

By Rachel Blakeburn.

Scientists in Spain and Italy have used simple and cheap wet lithography to generate highly electrical conductive structures located upon demand on technologically relevant surfaces. The team tested the materials as electrodes in organic field‐effect transistor devices and they say it opens the way to a broad range of potential applications, such as molecular sensors.

Link to journal article
Patterned conductive nanostructures from reversible self-assemble of 1D coordination polymer
D Gentili et al
Chem. Sci., 2012, DOI: 10.1039/c2sc00029f

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Molecular recognition and modern physical organic chemistry – free articles!

26 Mar 2012

By Ross McLaren, Development Editor.

Honouring the work of Professor Julius Rebek Jr

Chemical Science and ChemComm are sponsoring the symposium on Playing Ball: Molecular Recognition and Modern Physical Organic Chemistry in honour of Professor Julius Rebek Jr at the spring ACS meeting. To celebrate, we’re giving free access to some recent articles from Professor Rebek and the symposium speakers until 1^st April.

Why don’t you have a read and let us know what you think?

Encapsulation of the uranyl dication
Stephan Beer, Orion B. Berryman, Dariush Ajami and Julius Rebek Jr., Chem. Sci., 2010, 1, 43-47

Shape-shifting in contorted dibenzotetrathienocoronenes
Chien-Yang Chiu, Bumjung Kim, Alon A. Gorodetsky, Wesley Sattler, Sujun Wei, Aaron Sattler, Michael Steigerwald and Colin Nuckolls, Chem. Sci., 2011, 2, 1480-1486

Gas-phase H/D-exchange reactions on resorcinarene and pyrogallarene capsules: Proton transport through a one-dimensional Grotthuss mechanism
Henrik D. F. Winkler, Egor V. Dzyuba, Julian A. W. Sklorz, N. Kodiah Beyeh, Kari Rissanen and Christoph A. Schalley, Chem. Sci., 2011, 2, 615-624

A dissymmetric molecular capsule with polar interior and two mechanically locked hemispheres
Marcos Chas and Pablo Ballester, Chem. Sci., 2012, 3, 186-191

A benzocrown-6-calix[4]arene methacrylate copolymer: Selective extraction of caesium ions from a multi-component system
Brett M. Rambo, Sung Kuk Kim, Jong Seung Kim, Christopher W. Bielawski and Jonathan L. Sessler, Chem. Sci., 2010, 1, 716-722

Cell surface-based differentiation of cell types and cancer states using a gold nanoparticle-GFP based sensing array
Avinash Bajaj, Subinoy Rana, Oscar R. Miranda, Joseph C. Yawe, D. Joseph Jerry, Uwe H. F. Bunz and Vincent M. Rotello, Chem. Sci., 2010, 1, 134-138

Donor-substituted octacyano[4]dendralenes: a new class of cyano-rich non-planar organic acceptors
Benjamin Breiten, Yi-Lin Wu, Peter D. Jarowski, Jean-Paul Gisselbrecht, Corinne Boudon, Markus Griesser, Christine Onitsch, Georg Gescheidt, W. Bernd Schweizer, Nicolle Langer, Christian Lennartz and François Diederich, Chem. Sci., 2011, 2, 88-93

A transparent photo-responsive organogel based on a glycoluril supergelator
Konrad Tiefenbacher, Henry Dube, Dariush Ajami and Julius Rebek, Chem. Commun., 2011, 47, 7341-7343

Recent advances in hydrogen-bonded hexameric encapsulation complexes
Liat Avram, Yoram Cohen and Julius Rebek Jr., Chem. Commun., 2011, 47, 5368-5375

A light controlled cavitand wall regulates guest binding
Orion B. Berryman, Aaron C. Sather and Julius Rebek Jr., Chem. Commun., 2011, 47, 656-658

Thermodynamically controlled self-sorting of hetero-bimetallic metallo-supramolecular macrocycles: what a difference a methylene group makes!
Boris Brusilowskij, Egor V. Dzyuba, Ralf W. Troff and Christoph A. Schalley, Chem. Commun., 2011, 47, 1830-1832

Anion-dependent fluorescence in bis(anilinoethynyl)pyridine derivatives: switchable ON–OFF and OFF–ON responses
Calden N. Carroll, Brian A. Coombs, Sean P. McClintock, Charles A. Johnson II, Orion B. Berryman, Darren W. Johnson and Michael M. Haley, Chem. Commun., 2011, 47, 5539-5541

Sodium and pH responsive hydrogel formation by the supramolecular system calix[4]pyrrole derivative/tetramethylammonium cation
Begoña Verdejo, Francisco Rodríguez-Llansola, Beatriu Escuder, Juan F. Miravet and Pablo Ballester, Chem. Commun., 2011, 47, 2017-2019

Conformational and spectroscopic properties of π-extended, bipyrrole-fused rubyrin and sapphyrin derivatives
Se-Young Kee, Jong Min Lim, Soo-Jin Kim, Jaeduk Yoo, Jung-Su Park, Tridib Sarma, Vincent M. Lynch, Pradeepta K. Panda, Jonathan L. Sessler, Dongho Kim and Chang-Hee Lee, Chem. Commun., 2011, 47, 6813-6815

Just add tetrazole: 5-(2-Pyrrolo)tetrazoles are simple, highly potent anion recognition elements
Rebecca J. M. Courtemanche, Thomas Pinter and Fraser Hof, Chem. Commun., 2011, 47, 12688-12690

Synthesis of cationic quantum dots via a two-step ligand exchange process
Yi-Cheun Yeh, Debabrata Patra, Bo Yan, Krishnendu Saha, Oscar R. Miranda, Chae Kyu Kim and Vincent M. Rotello, Chem. Commun., 2011, 47, 3069-3071

Expanding the chemical space for push-pull chromophores by non-concerted [2+2] and [4+2] cycloadditions: access to a highly functionalised 6,6-dicyanopentafulvene with an intense, low-energy charge-transfer band
Govindasamy Jayamurugan, Jean-Paul Gisselbrecht, Corinne Boudon, Franziska Schoenebeck, W. Bernd Schweizer, Bruno Bernet and François Diederich, Chem. Commun., 2011, 47, 4520-4522

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Stimuli-Responsive Supramolecular Assemblies – free content for a limited period

25 Mar 2012

By Ross McLaren, Development Editor.

Chemical Science and ChemComm are delighted to be sponsoring the New Frontiers in Stimuli-Responsive Supramolecular Assemblies symposium – check out our free content (for a limited period)!

Chemical Science and ChemComm are delighted to be sponsoring the New Frontiers in Stimuli-Responsive Supramolecular Assemblies symposium at the ACS spring meeting in San Diego.

To celebrate this fantastic symposium, Chemical Science is giving free access to some recent articles from a selection of the symposium’s guest speakers. Why not check out why they choose to publish with Chemical Science?

Cylindrical micelles from the living crystallization-driven self-assembly of poly(lactide)-containing block copolymers
Nikos Petzetakis, Andrew P. Dove and Rachel K. O’Reilly, Chem. Sci., 2011, 2, 955-960

A programmable transducer self-assembled from DNA
Banani Chakraborty, Natasha Jonoska and Nadrian C. Seeman, Chem. Sci., 2012, 3, 168-176

A mechanistic study of Lewis acid-catalyzed covalent organic framework formation
Eric L. Spitler, Marissa R. Giovino, Sarah L. White and William R. Dichtel, Chem. Sci., 2011, 2, 1588-1593

Cell-compatible, integrin-targeted cryptophane-129Xe NMR biosensors
Garry K. Seward, Yubin Bai, Najat S. Khan and Ivan J. Dmochowski, Chem. Sci., 2011, 2, 1103-1110

This content will be free to access until 1st April.

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Scandium catalyst for epoxidation reactions

22 Mar 2012

By Rachel Blakeburn.

A highly efficient scandium-catalysed asymmetric epoxidation reaction with hydrogen peroxide as the oxidant has been developed by researchers in China. The Sc(OTf)₃ complex enabled epoxidation of a wide range of alpha,beta-unsaturated ketones and amides in overall excellent yields and enantioselectivites.

The reaction is also compatible with dilute aqueous hydrogen peroxide, increasing the safety and practicality of current reactions.

Link to journal article
Asymmetric Catalytic Epoxidation of alfa, beta-Unsaturated Carbonyl Compounds with Hydrogen Peroxide: Additive-Free and Wide Substrate Scope
Y Chu et al
Chem. Sci., 2012, DOI: 10.1039/c2sc20218b

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New cyanine dye overcomes current dye drawbacks

20 Mar 2012

By Rachel Blakeburn.

Cyanine dyes have been widely used for fluorescent sensory applications in both industry and academia. However, they are limited by drawbacks such as a small Stokes shift (up to 20nm) and concentration quenching effect.

Scientists in China have now designed a red emissive hemicyanine dye that overcomes these drawbacks. The dye possesses a large Stokes shift (>185nm) and shows different colours and intensities over a broad pH range (pH 5-14).

The acid/base-switched red/blue emission transition is reversible and can last for many cycles.

Link to journal article
An AIE-active hemicyanine fluorogen with stimuli-responsive red/blue emission: Extending the pH sensing range by “switch + knob” effect
S Chen et al
Chem. Sci., 2012, DOI: 10.1039/c2sc01108e

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Plastic explosives detector

20 Mar 2012

By Rachel Blakeburn.

Scientists in the US have developed a way to detect and differentiate between mixtures of plasticisers within plastic explosives such as Semtex and C4 to provide information for anti-terrorism activities.

The team bound a fluorescent indicator to a plasma protein, which then binds to the plasticisers. A cross-reactive array was used to reveal which plasticisers were present in the explosive mixtures.

Link to journal article
Exploration of Plasticizer and Plastic Explosive Detection and Differentiation with Serum Albumin Cross-Reactive Arrays
M A Ivy et al
Chem. Sci., 2012, DOI: 10.1039/c2sc20083j

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Multi-tasking MOF

20 Mar 2012

By Rachel Blakeburn.

Scientists in China have shown that their N-rich zeolite-like metal-organic framework shows high CO₂ uptake, selective gas adsorption and efficient drug delivery.

Find out more:
N-rich zeolite-like metal-organic framework with sodalite topology: high CO₂ uptake, selective gas adsorption and efficient drug delivery
J-S Qin et al, Chem. Sci., 2012, DOI: 10.1039/c2sc00017b

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3D nanochannels making travel easy for ions

20 Mar 2012

By Rachel Blakeburn.

Scientists in Japan have demonstrated that the supramolecular organisation of ionic liquids is a promising way for constructing highly ion conductive materials. The team used the ionic liquids to make three-dimensional nanochannels that function as efficient transportation pathways for ions.

Link to journal article
Co-organisation of ionic liquids with amphiphilic diethanolamines: construction of 3D continuous ionic nanochannels through the induction of liquid-crystalline bicontinuous cubic phases
T Ichikawa et al
Chem. Sci., 2012, DOI: 10.1039/c2sc00981a

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Why does ice behave differently from other materials when compressed?

20 Mar 2012

By Rachel Blakeburn.

Scientists in Singapore and China say it is due to a hidden force – a coulomb repulsion between the unevenly-bound bonding and non-bonding electron pairs in the hydrogen bond. Understanding the behaviour of water is key to many fields of science and engineering.

Link to journal article
The hidden force opposing ice compression
C Q Sun, X Zhang and W Zheng
Chem. Sci., 2012, DOI: 10.1039/c2sc20066j

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Chemical Science Blog

First efficient catalyst to synthesise hindered heterobiaryls by direct C–H coupling

First coordination polymer-based devices

Molecular recognition and modern physical organic chemistry – free articles!

Stimuli-Responsive Supramolecular Assemblies – free content for a limited period

Scandium catalyst for epoxidation reactions

New cyanine dye overcomes current dye drawbacks

Plastic explosives detector

Multi-tasking MOF

3D nanochannels making travel easy for ions

Why does ice behave differently from other materials when compressed?

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